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Unified Diff: third_party/sqlite/sqlite-src-3080704/src/insert.c

Issue 949043002: Add //third_party/sqlite to dirs_to_snapshot, remove net_sql.patch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 10 months ago
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Index: third_party/sqlite/sqlite-src-3080704/src/insert.c
diff --git a/third_party/sqlite/sqlite-src-3080704/src/insert.c b/third_party/sqlite/sqlite-src-3080704/src/insert.c
new file mode 100644
index 0000000000000000000000000000000000000000..a5c3f3e92d437dcb0bd349017afae3e5e4c00843
--- /dev/null
+++ b/third_party/sqlite/sqlite-src-3080704/src/insert.c
@@ -0,0 +1,2021 @@
+/*
+** 2001 September 15
+**
+** The author disclaims copyright to this source code. In place of
+** a legal notice, here is a blessing:
+**
+** May you do good and not evil.
+** May you find forgiveness for yourself and forgive others.
+** May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains C code routines that are called by the parser
+** to handle INSERT statements in SQLite.
+*/
+#include "sqliteInt.h"
+
+/*
+** Generate code that will
+**
+** (1) acquire a lock for table pTab then
+** (2) open pTab as cursor iCur.
+**
+** If pTab is a WITHOUT ROWID table, then it is the PRIMARY KEY index
+** for that table that is actually opened.
+*/
+void sqlite3OpenTable(
+ Parse *pParse, /* Generate code into this VDBE */
+ int iCur, /* The cursor number of the table */
+ int iDb, /* The database index in sqlite3.aDb[] */
+ Table *pTab, /* The table to be opened */
+ int opcode /* OP_OpenRead or OP_OpenWrite */
+){
+ Vdbe *v;
+ assert( !IsVirtual(pTab) );
+ v = sqlite3GetVdbe(pParse);
+ assert( opcode==OP_OpenWrite || opcode==OP_OpenRead );
+ sqlite3TableLock(pParse, iDb, pTab->tnum,
+ (opcode==OP_OpenWrite)?1:0, pTab->zName);
+ if( HasRowid(pTab) ){
+ sqlite3VdbeAddOp4Int(v, opcode, iCur, pTab->tnum, iDb, pTab->nCol);
+ VdbeComment((v, "%s", pTab->zName));
+ }else{
+ Index *pPk = sqlite3PrimaryKeyIndex(pTab);
+ assert( pPk!=0 );
+ assert( pPk->tnum=pTab->tnum );
+ sqlite3VdbeAddOp3(v, opcode, iCur, pPk->tnum, iDb);
+ sqlite3VdbeSetP4KeyInfo(pParse, pPk);
+ VdbeComment((v, "%s", pTab->zName));
+ }
+}
+
+/*
+** Return a pointer to the column affinity string associated with index
+** pIdx. A column affinity string has one character for each column in
+** the table, according to the affinity of the column:
+**
+** Character Column affinity
+** ------------------------------
+** 'A' NONE
+** 'B' TEXT
+** 'C' NUMERIC
+** 'D' INTEGER
+** 'F' REAL
+**
+** An extra 'D' is appended to the end of the string to cover the
+** rowid that appears as the last column in every index.
+**
+** Memory for the buffer containing the column index affinity string
+** is managed along with the rest of the Index structure. It will be
+** released when sqlite3DeleteIndex() is called.
+*/
+const char *sqlite3IndexAffinityStr(Vdbe *v, Index *pIdx){
+ if( !pIdx->zColAff ){
+ /* The first time a column affinity string for a particular index is
+ ** required, it is allocated and populated here. It is then stored as
+ ** a member of the Index structure for subsequent use.
+ **
+ ** The column affinity string will eventually be deleted by
+ ** sqliteDeleteIndex() when the Index structure itself is cleaned
+ ** up.
+ */
+ int n;
+ Table *pTab = pIdx->pTable;
+ sqlite3 *db = sqlite3VdbeDb(v);
+ pIdx->zColAff = (char *)sqlite3DbMallocRaw(0, pIdx->nColumn+1);
+ if( !pIdx->zColAff ){
+ db->mallocFailed = 1;
+ return 0;
+ }
+ for(n=0; n<pIdx->nColumn; n++){
+ i16 x = pIdx->aiColumn[n];
+ pIdx->zColAff[n] = x<0 ? SQLITE_AFF_INTEGER : pTab->aCol[x].affinity;
+ }
+ pIdx->zColAff[n] = 0;
+ }
+
+ return pIdx->zColAff;
+}
+
+/*
+** Compute the affinity string for table pTab, if it has not already been
+** computed. As an optimization, omit trailing SQLITE_AFF_NONE affinities.
+**
+** If the affinity exists (if it is no entirely SQLITE_AFF_NONE values) and
+** if iReg>0 then code an OP_Affinity opcode that will set the affinities
+** for register iReg and following. Or if affinities exists and iReg==0,
+** then just set the P4 operand of the previous opcode (which should be
+** an OP_MakeRecord) to the affinity string.
+**
+** A column affinity string has one character per column:
+**
+** Character Column affinity
+** ------------------------------
+** 'A' NONE
+** 'B' TEXT
+** 'C' NUMERIC
+** 'D' INTEGER
+** 'E' REAL
+*/
+void sqlite3TableAffinity(Vdbe *v, Table *pTab, int iReg){
+ int i;
+ char *zColAff = pTab->zColAff;
+ if( zColAff==0 ){
+ sqlite3 *db = sqlite3VdbeDb(v);
+ zColAff = (char *)sqlite3DbMallocRaw(0, pTab->nCol+1);
+ if( !zColAff ){
+ db->mallocFailed = 1;
+ return;
+ }
+
+ for(i=0; i<pTab->nCol; i++){
+ zColAff[i] = pTab->aCol[i].affinity;
+ }
+ do{
+ zColAff[i--] = 0;
+ }while( i>=0 && zColAff[i]==SQLITE_AFF_NONE );
+ pTab->zColAff = zColAff;
+ }
+ i = sqlite3Strlen30(zColAff);
+ if( i ){
+ if( iReg ){
+ sqlite3VdbeAddOp4(v, OP_Affinity, iReg, i, 0, zColAff, i);
+ }else{
+ sqlite3VdbeChangeP4(v, -1, zColAff, i);
+ }
+ }
+}
+
+/*
+** Return non-zero if the table pTab in database iDb or any of its indices
+** have been opened at any point in the VDBE program. This is used to see if
+** a statement of the form "INSERT INTO <iDb, pTab> SELECT ..." can
+** run without using a temporary table for the results of the SELECT.
+*/
+static int readsTable(Parse *p, int iDb, Table *pTab){
+ Vdbe *v = sqlite3GetVdbe(p);
+ int i;
+ int iEnd = sqlite3VdbeCurrentAddr(v);
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+ VTable *pVTab = IsVirtual(pTab) ? sqlite3GetVTable(p->db, pTab) : 0;
+#endif
+
+ for(i=1; i<iEnd; i++){
+ VdbeOp *pOp = sqlite3VdbeGetOp(v, i);
+ assert( pOp!=0 );
+ if( pOp->opcode==OP_OpenRead && pOp->p3==iDb ){
+ Index *pIndex;
+ int tnum = pOp->p2;
+ if( tnum==pTab->tnum ){
+ return 1;
+ }
+ for(pIndex=pTab->pIndex; pIndex; pIndex=pIndex->pNext){
+ if( tnum==pIndex->tnum ){
+ return 1;
+ }
+ }
+ }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+ if( pOp->opcode==OP_VOpen && pOp->p4.pVtab==pVTab ){
+ assert( pOp->p4.pVtab!=0 );
+ assert( pOp->p4type==P4_VTAB );
+ return 1;
+ }
+#endif
+ }
+ return 0;
+}
+
+#ifndef SQLITE_OMIT_AUTOINCREMENT
+/*
+** Locate or create an AutoincInfo structure associated with table pTab
+** which is in database iDb. Return the register number for the register
+** that holds the maximum rowid.
+**
+** There is at most one AutoincInfo structure per table even if the
+** same table is autoincremented multiple times due to inserts within
+** triggers. A new AutoincInfo structure is created if this is the
+** first use of table pTab. On 2nd and subsequent uses, the original
+** AutoincInfo structure is used.
+**
+** Three memory locations are allocated:
+**
+** (1) Register to hold the name of the pTab table.
+** (2) Register to hold the maximum ROWID of pTab.
+** (3) Register to hold the rowid in sqlite_sequence of pTab
+**
+** The 2nd register is the one that is returned. That is all the
+** insert routine needs to know about.
+*/
+static int autoIncBegin(
+ Parse *pParse, /* Parsing context */
+ int iDb, /* Index of the database holding pTab */
+ Table *pTab /* The table we are writing to */
+){
+ int memId = 0; /* Register holding maximum rowid */
+ if( pTab->tabFlags & TF_Autoincrement ){
+ Parse *pToplevel = sqlite3ParseToplevel(pParse);
+ AutoincInfo *pInfo;
+
+ pInfo = pToplevel->pAinc;
+ while( pInfo && pInfo->pTab!=pTab ){ pInfo = pInfo->pNext; }
+ if( pInfo==0 ){
+ pInfo = sqlite3DbMallocRaw(pParse->db, sizeof(*pInfo));
+ if( pInfo==0 ) return 0;
+ pInfo->pNext = pToplevel->pAinc;
+ pToplevel->pAinc = pInfo;
+ pInfo->pTab = pTab;
+ pInfo->iDb = iDb;
+ pToplevel->nMem++; /* Register to hold name of table */
+ pInfo->regCtr = ++pToplevel->nMem; /* Max rowid register */
+ pToplevel->nMem++; /* Rowid in sqlite_sequence */
+ }
+ memId = pInfo->regCtr;
+ }
+ return memId;
+}
+
+/*
+** This routine generates code that will initialize all of the
+** register used by the autoincrement tracker.
+*/
+void sqlite3AutoincrementBegin(Parse *pParse){
+ AutoincInfo *p; /* Information about an AUTOINCREMENT */
+ sqlite3 *db = pParse->db; /* The database connection */
+ Db *pDb; /* Database only autoinc table */
+ int memId; /* Register holding max rowid */
+ int addr; /* A VDBE address */
+ Vdbe *v = pParse->pVdbe; /* VDBE under construction */
+
+ /* This routine is never called during trigger-generation. It is
+ ** only called from the top-level */
+ assert( pParse->pTriggerTab==0 );
+ assert( pParse==sqlite3ParseToplevel(pParse) );
+
+ assert( v ); /* We failed long ago if this is not so */
+ for(p = pParse->pAinc; p; p = p->pNext){
+ pDb = &db->aDb[p->iDb];
+ memId = p->regCtr;
+ assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
+ sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenRead);
+ sqlite3VdbeAddOp3(v, OP_Null, 0, memId, memId+1);
+ addr = sqlite3VdbeCurrentAddr(v);
+ sqlite3VdbeAddOp4(v, OP_String8, 0, memId-1, 0, p->pTab->zName, 0);
+ sqlite3VdbeAddOp2(v, OP_Rewind, 0, addr+9); VdbeCoverage(v);
+ sqlite3VdbeAddOp3(v, OP_Column, 0, 0, memId);
+ sqlite3VdbeAddOp3(v, OP_Ne, memId-1, addr+7, memId); VdbeCoverage(v);
+ sqlite3VdbeChangeP5(v, SQLITE_JUMPIFNULL);
+ sqlite3VdbeAddOp2(v, OP_Rowid, 0, memId+1);
+ sqlite3VdbeAddOp3(v, OP_Column, 0, 1, memId);
+ sqlite3VdbeAddOp2(v, OP_Goto, 0, addr+9);
+ sqlite3VdbeAddOp2(v, OP_Next, 0, addr+2); VdbeCoverage(v);
+ sqlite3VdbeAddOp2(v, OP_Integer, 0, memId);
+ sqlite3VdbeAddOp0(v, OP_Close);
+ }
+}
+
+/*
+** Update the maximum rowid for an autoincrement calculation.
+**
+** This routine should be called when the top of the stack holds a
+** new rowid that is about to be inserted. If that new rowid is
+** larger than the maximum rowid in the memId memory cell, then the
+** memory cell is updated. The stack is unchanged.
+*/
+static void autoIncStep(Parse *pParse, int memId, int regRowid){
+ if( memId>0 ){
+ sqlite3VdbeAddOp2(pParse->pVdbe, OP_MemMax, memId, regRowid);
+ }
+}
+
+/*
+** This routine generates the code needed to write autoincrement
+** maximum rowid values back into the sqlite_sequence register.
+** Every statement that might do an INSERT into an autoincrement
+** table (either directly or through triggers) needs to call this
+** routine just before the "exit" code.
+*/
+void sqlite3AutoincrementEnd(Parse *pParse){
+ AutoincInfo *p;
+ Vdbe *v = pParse->pVdbe;
+ sqlite3 *db = pParse->db;
+
+ assert( v );
+ for(p = pParse->pAinc; p; p = p->pNext){
+ Db *pDb = &db->aDb[p->iDb];
+ int j1;
+ int iRec;
+ int memId = p->regCtr;
+
+ iRec = sqlite3GetTempReg(pParse);
+ assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
+ sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenWrite);
+ j1 = sqlite3VdbeAddOp1(v, OP_NotNull, memId+1); VdbeCoverage(v);
+ sqlite3VdbeAddOp2(v, OP_NewRowid, 0, memId+1);
+ sqlite3VdbeJumpHere(v, j1);
+ sqlite3VdbeAddOp3(v, OP_MakeRecord, memId-1, 2, iRec);
+ sqlite3VdbeAddOp3(v, OP_Insert, 0, iRec, memId+1);
+ sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
+ sqlite3VdbeAddOp0(v, OP_Close);
+ sqlite3ReleaseTempReg(pParse, iRec);
+ }
+}
+#else
+/*
+** If SQLITE_OMIT_AUTOINCREMENT is defined, then the three routines
+** above are all no-ops
+*/
+# define autoIncBegin(A,B,C) (0)
+# define autoIncStep(A,B,C)
+#endif /* SQLITE_OMIT_AUTOINCREMENT */
+
+
+/* Forward declaration */
+static int xferOptimization(
+ Parse *pParse, /* Parser context */
+ Table *pDest, /* The table we are inserting into */
+ Select *pSelect, /* A SELECT statement to use as the data source */
+ int onError, /* How to handle constraint errors */
+ int iDbDest /* The database of pDest */
+);
+
+/*
+** This routine is called to handle SQL of the following forms:
+**
+** insert into TABLE (IDLIST) values(EXPRLIST)
+** insert into TABLE (IDLIST) select
+**
+** The IDLIST following the table name is always optional. If omitted,
+** then a list of all columns for the table is substituted. The IDLIST
+** appears in the pColumn parameter. pColumn is NULL if IDLIST is omitted.
+**
+** The pList parameter holds EXPRLIST in the first form of the INSERT
+** statement above, and pSelect is NULL. For the second form, pList is
+** NULL and pSelect is a pointer to the select statement used to generate
+** data for the insert.
+**
+** The code generated follows one of four templates. For a simple
+** insert with data coming from a VALUES clause, the code executes
+** once straight down through. Pseudo-code follows (we call this
+** the "1st template"):
+**
+** open write cursor to <table> and its indices
+** put VALUES clause expressions into registers
+** write the resulting record into <table>
+** cleanup
+**
+** The three remaining templates assume the statement is of the form
+**
+** INSERT INTO <table> SELECT ...
+**
+** If the SELECT clause is of the restricted form "SELECT * FROM <table2>" -
+** in other words if the SELECT pulls all columns from a single table
+** and there is no WHERE or LIMIT or GROUP BY or ORDER BY clauses, and
+** if <table2> and <table1> are distinct tables but have identical
+** schemas, including all the same indices, then a special optimization
+** is invoked that copies raw records from <table2> over to <table1>.
+** See the xferOptimization() function for the implementation of this
+** template. This is the 2nd template.
+**
+** open a write cursor to <table>
+** open read cursor on <table2>
+** transfer all records in <table2> over to <table>
+** close cursors
+** foreach index on <table>
+** open a write cursor on the <table> index
+** open a read cursor on the corresponding <table2> index
+** transfer all records from the read to the write cursors
+** close cursors
+** end foreach
+**
+** The 3rd template is for when the second template does not apply
+** and the SELECT clause does not read from <table> at any time.
+** The generated code follows this template:
+**
+** X <- A
+** goto B
+** A: setup for the SELECT
+** loop over the rows in the SELECT
+** load values into registers R..R+n
+** yield X
+** end loop
+** cleanup after the SELECT
+** end-coroutine X
+** B: open write cursor to <table> and its indices
+** C: yield X, at EOF goto D
+** insert the select result into <table> from R..R+n
+** goto C
+** D: cleanup
+**
+** The 4th template is used if the insert statement takes its
+** values from a SELECT but the data is being inserted into a table
+** that is also read as part of the SELECT. In the third form,
+** we have to use an intermediate table to store the results of
+** the select. The template is like this:
+**
+** X <- A
+** goto B
+** A: setup for the SELECT
+** loop over the tables in the SELECT
+** load value into register R..R+n
+** yield X
+** end loop
+** cleanup after the SELECT
+** end co-routine R
+** B: open temp table
+** L: yield X, at EOF goto M
+** insert row from R..R+n into temp table
+** goto L
+** M: open write cursor to <table> and its indices
+** rewind temp table
+** C: loop over rows of intermediate table
+** transfer values form intermediate table into <table>
+** end loop
+** D: cleanup
+*/
+void sqlite3Insert(
+ Parse *pParse, /* Parser context */
+ SrcList *pTabList, /* Name of table into which we are inserting */
+ Select *pSelect, /* A SELECT statement to use as the data source */
+ IdList *pColumn, /* Column names corresponding to IDLIST. */
+ int onError /* How to handle constraint errors */
+){
+ sqlite3 *db; /* The main database structure */
+ Table *pTab; /* The table to insert into. aka TABLE */
+ char *zTab; /* Name of the table into which we are inserting */
+ const char *zDb; /* Name of the database holding this table */
+ int i, j, idx; /* Loop counters */
+ Vdbe *v; /* Generate code into this virtual machine */
+ Index *pIdx; /* For looping over indices of the table */
+ int nColumn; /* Number of columns in the data */
+ int nHidden = 0; /* Number of hidden columns if TABLE is virtual */
+ int iDataCur = 0; /* VDBE cursor that is the main data repository */
+ int iIdxCur = 0; /* First index cursor */
+ int ipkColumn = -1; /* Column that is the INTEGER PRIMARY KEY */
+ int endOfLoop; /* Label for the end of the insertion loop */
+ int srcTab = 0; /* Data comes from this temporary cursor if >=0 */
+ int addrInsTop = 0; /* Jump to label "D" */
+ int addrCont = 0; /* Top of insert loop. Label "C" in templates 3 and 4 */
+ SelectDest dest; /* Destination for SELECT on rhs of INSERT */
+ int iDb; /* Index of database holding TABLE */
+ Db *pDb; /* The database containing table being inserted into */
+ u8 useTempTable = 0; /* Store SELECT results in intermediate table */
+ u8 appendFlag = 0; /* True if the insert is likely to be an append */
+ u8 withoutRowid; /* 0 for normal table. 1 for WITHOUT ROWID table */
+ u8 bIdListInOrder = 1; /* True if IDLIST is in table order */
+ ExprList *pList = 0; /* List of VALUES() to be inserted */
+
+ /* Register allocations */
+ int regFromSelect = 0;/* Base register for data coming from SELECT */
+ int regAutoinc = 0; /* Register holding the AUTOINCREMENT counter */
+ int regRowCount = 0; /* Memory cell used for the row counter */
+ int regIns; /* Block of regs holding rowid+data being inserted */
+ int regRowid; /* registers holding insert rowid */
+ int regData; /* register holding first column to insert */
+ int *aRegIdx = 0; /* One register allocated to each index */
+
+#ifndef SQLITE_OMIT_TRIGGER
+ int isView; /* True if attempting to insert into a view */
+ Trigger *pTrigger; /* List of triggers on pTab, if required */
+ int tmask; /* Mask of trigger times */
+#endif
+
+ db = pParse->db;
+ memset(&dest, 0, sizeof(dest));
+ if( pParse->nErr || db->mallocFailed ){
+ goto insert_cleanup;
+ }
+
+ /* If the Select object is really just a simple VALUES() list with a
+ ** single row values (the common case) then keep that one row of values
+ ** and go ahead and discard the Select object
+ */
+ if( pSelect && (pSelect->selFlags & SF_Values)!=0 && pSelect->pPrior==0 ){
+ pList = pSelect->pEList;
+ pSelect->pEList = 0;
+ sqlite3SelectDelete(db, pSelect);
+ pSelect = 0;
+ }
+
+ /* Locate the table into which we will be inserting new information.
+ */
+ assert( pTabList->nSrc==1 );
+ zTab = pTabList->a[0].zName;
+ if( NEVER(zTab==0) ) goto insert_cleanup;
+ pTab = sqlite3SrcListLookup(pParse, pTabList);
+ if( pTab==0 ){
+ goto insert_cleanup;
+ }
+ iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+ assert( iDb<db->nDb );
+ pDb = &db->aDb[iDb];
+ zDb = pDb->zName;
+ if( sqlite3AuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0, zDb) ){
+ goto insert_cleanup;
+ }
+ withoutRowid = !HasRowid(pTab);
+
+ /* Figure out if we have any triggers and if the table being
+ ** inserted into is a view
+ */
+#ifndef SQLITE_OMIT_TRIGGER
+ pTrigger = sqlite3TriggersExist(pParse, pTab, TK_INSERT, 0, &tmask);
+ isView = pTab->pSelect!=0;
+#else
+# define pTrigger 0
+# define tmask 0
+# define isView 0
+#endif
+#ifdef SQLITE_OMIT_VIEW
+# undef isView
+# define isView 0
+#endif
+ assert( (pTrigger && tmask) || (pTrigger==0 && tmask==0) );
+
+ /* If pTab is really a view, make sure it has been initialized.
+ ** ViewGetColumnNames() is a no-op if pTab is not a view.
+ */
+ if( sqlite3ViewGetColumnNames(pParse, pTab) ){
+ goto insert_cleanup;
+ }
+
+ /* Cannot insert into a read-only table.
+ */
+ if( sqlite3IsReadOnly(pParse, pTab, tmask) ){
+ goto insert_cleanup;
+ }
+
+ /* Allocate a VDBE
+ */
+ v = sqlite3GetVdbe(pParse);
+ if( v==0 ) goto insert_cleanup;
+ if( pParse->nested==0 ) sqlite3VdbeCountChanges(v);
+ sqlite3BeginWriteOperation(pParse, pSelect || pTrigger, iDb);
+
+#ifndef SQLITE_OMIT_XFER_OPT
+ /* If the statement is of the form
+ **
+ ** INSERT INTO <table1> SELECT * FROM <table2>;
+ **
+ ** Then special optimizations can be applied that make the transfer
+ ** very fast and which reduce fragmentation of indices.
+ **
+ ** This is the 2nd template.
+ */
+ if( pColumn==0 && xferOptimization(pParse, pTab, pSelect, onError, iDb) ){
+ assert( !pTrigger );
+ assert( pList==0 );
+ goto insert_end;
+ }
+#endif /* SQLITE_OMIT_XFER_OPT */
+
+ /* If this is an AUTOINCREMENT table, look up the sequence number in the
+ ** sqlite_sequence table and store it in memory cell regAutoinc.
+ */
+ regAutoinc = autoIncBegin(pParse, iDb, pTab);
+
+ /* Allocate registers for holding the rowid of the new row,
+ ** the content of the new row, and the assembled row record.
+ */
+ regRowid = regIns = pParse->nMem+1;
+ pParse->nMem += pTab->nCol + 1;
+ if( IsVirtual(pTab) ){
+ regRowid++;
+ pParse->nMem++;
+ }
+ regData = regRowid+1;
+
+ /* If the INSERT statement included an IDLIST term, then make sure
+ ** all elements of the IDLIST really are columns of the table and
+ ** remember the column indices.
+ **
+ ** If the table has an INTEGER PRIMARY KEY column and that column
+ ** is named in the IDLIST, then record in the ipkColumn variable
+ ** the index into IDLIST of the primary key column. ipkColumn is
+ ** the index of the primary key as it appears in IDLIST, not as
+ ** is appears in the original table. (The index of the INTEGER
+ ** PRIMARY KEY in the original table is pTab->iPKey.)
+ */
+ if( pColumn ){
+ for(i=0; i<pColumn->nId; i++){
+ pColumn->a[i].idx = -1;
+ }
+ for(i=0; i<pColumn->nId; i++){
+ for(j=0; j<pTab->nCol; j++){
+ if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){
+ pColumn->a[i].idx = j;
+ if( i!=j ) bIdListInOrder = 0;
+ if( j==pTab->iPKey ){
+ ipkColumn = i; assert( !withoutRowid );
+ }
+ break;
+ }
+ }
+ if( j>=pTab->nCol ){
+ if( sqlite3IsRowid(pColumn->a[i].zName) && !withoutRowid ){
+ ipkColumn = i;
+ bIdListInOrder = 0;
+ }else{
+ sqlite3ErrorMsg(pParse, "table %S has no column named %s",
+ pTabList, 0, pColumn->a[i].zName);
+ pParse->checkSchema = 1;
+ goto insert_cleanup;
+ }
+ }
+ }
+ }
+
+ /* Figure out how many columns of data are supplied. If the data
+ ** is coming from a SELECT statement, then generate a co-routine that
+ ** produces a single row of the SELECT on each invocation. The
+ ** co-routine is the common header to the 3rd and 4th templates.
+ */
+ if( pSelect ){
+ /* Data is coming from a SELECT. Generate a co-routine to run the SELECT */
+ int regYield; /* Register holding co-routine entry-point */
+ int addrTop; /* Top of the co-routine */
+ int rc; /* Result code */
+
+ regYield = ++pParse->nMem;
+ addrTop = sqlite3VdbeCurrentAddr(v) + 1;
+ sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, addrTop);
+ sqlite3SelectDestInit(&dest, SRT_Coroutine, regYield);
+ dest.iSdst = bIdListInOrder ? regData : 0;
+ dest.nSdst = pTab->nCol;
+ rc = sqlite3Select(pParse, pSelect, &dest);
+ regFromSelect = dest.iSdst;
+ assert( pParse->nErr==0 || rc );
+ if( rc || db->mallocFailed ) goto insert_cleanup;
+ sqlite3VdbeAddOp1(v, OP_EndCoroutine, regYield);
+ sqlite3VdbeJumpHere(v, addrTop - 1); /* label B: */
+ assert( pSelect->pEList );
+ nColumn = pSelect->pEList->nExpr;
+
+ /* Set useTempTable to TRUE if the result of the SELECT statement
+ ** should be written into a temporary table (template 4). Set to
+ ** FALSE if each output row of the SELECT can be written directly into
+ ** the destination table (template 3).
+ **
+ ** A temp table must be used if the table being updated is also one
+ ** of the tables being read by the SELECT statement. Also use a
+ ** temp table in the case of row triggers.
+ */
+ if( pTrigger || readsTable(pParse, iDb, pTab) ){
+ useTempTable = 1;
+ }
+
+ if( useTempTable ){
+ /* Invoke the coroutine to extract information from the SELECT
+ ** and add it to a transient table srcTab. The code generated
+ ** here is from the 4th template:
+ **
+ ** B: open temp table
+ ** L: yield X, goto M at EOF
+ ** insert row from R..R+n into temp table
+ ** goto L
+ ** M: ...
+ */
+ int regRec; /* Register to hold packed record */
+ int regTempRowid; /* Register to hold temp table ROWID */
+ int addrL; /* Label "L" */
+
+ srcTab = pParse->nTab++;
+ regRec = sqlite3GetTempReg(pParse);
+ regTempRowid = sqlite3GetTempReg(pParse);
+ sqlite3VdbeAddOp2(v, OP_OpenEphemeral, srcTab, nColumn);
+ addrL = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm); VdbeCoverage(v);
+ sqlite3VdbeAddOp3(v, OP_MakeRecord, regFromSelect, nColumn, regRec);
+ sqlite3VdbeAddOp2(v, OP_NewRowid, srcTab, regTempRowid);
+ sqlite3VdbeAddOp3(v, OP_Insert, srcTab, regRec, regTempRowid);
+ sqlite3VdbeAddOp2(v, OP_Goto, 0, addrL);
+ sqlite3VdbeJumpHere(v, addrL);
+ sqlite3ReleaseTempReg(pParse, regRec);
+ sqlite3ReleaseTempReg(pParse, regTempRowid);
+ }
+ }else{
+ /* This is the case if the data for the INSERT is coming from a VALUES
+ ** clause
+ */
+ NameContext sNC;
+ memset(&sNC, 0, sizeof(sNC));
+ sNC.pParse = pParse;
+ srcTab = -1;
+ assert( useTempTable==0 );
+ nColumn = pList ? pList->nExpr : 0;
+ for(i=0; i<nColumn; i++){
+ if( sqlite3ResolveExprNames(&sNC, pList->a[i].pExpr) ){
+ goto insert_cleanup;
+ }
+ }
+ }
+
+ /* If there is no IDLIST term but the table has an integer primary
+ ** key, the set the ipkColumn variable to the integer primary key
+ ** column index in the original table definition.
+ */
+ if( pColumn==0 && nColumn>0 ){
+ ipkColumn = pTab->iPKey;
+ }
+
+ /* Make sure the number of columns in the source data matches the number
+ ** of columns to be inserted into the table.
+ */
+ if( IsVirtual(pTab) ){
+ for(i=0; i<pTab->nCol; i++){
+ nHidden += (IsHiddenColumn(&pTab->aCol[i]) ? 1 : 0);
+ }
+ }
+ if( pColumn==0 && nColumn && nColumn!=(pTab->nCol-nHidden) ){
+ sqlite3ErrorMsg(pParse,
+ "table %S has %d columns but %d values were supplied",
+ pTabList, 0, pTab->nCol-nHidden, nColumn);
+ goto insert_cleanup;
+ }
+ if( pColumn!=0 && nColumn!=pColumn->nId ){
+ sqlite3ErrorMsg(pParse, "%d values for %d columns", nColumn, pColumn->nId);
+ goto insert_cleanup;
+ }
+
+ /* Initialize the count of rows to be inserted
+ */
+ if( db->flags & SQLITE_CountRows ){
+ regRowCount = ++pParse->nMem;
+ sqlite3VdbeAddOp2(v, OP_Integer, 0, regRowCount);
+ }
+
+ /* If this is not a view, open the table and and all indices */
+ if( !isView ){
+ int nIdx;
+ nIdx = sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, -1, 0,
+ &iDataCur, &iIdxCur);
+ aRegIdx = sqlite3DbMallocRaw(db, sizeof(int)*(nIdx+1));
+ if( aRegIdx==0 ){
+ goto insert_cleanup;
+ }
+ for(i=0; i<nIdx; i++){
+ aRegIdx[i] = ++pParse->nMem;
+ }
+ }
+
+ /* This is the top of the main insertion loop */
+ if( useTempTable ){
+ /* This block codes the top of loop only. The complete loop is the
+ ** following pseudocode (template 4):
+ **
+ ** rewind temp table, if empty goto D
+ ** C: loop over rows of intermediate table
+ ** transfer values form intermediate table into <table>
+ ** end loop
+ ** D: ...
+ */
+ addrInsTop = sqlite3VdbeAddOp1(v, OP_Rewind, srcTab); VdbeCoverage(v);
+ addrCont = sqlite3VdbeCurrentAddr(v);
+ }else if( pSelect ){
+ /* This block codes the top of loop only. The complete loop is the
+ ** following pseudocode (template 3):
+ **
+ ** C: yield X, at EOF goto D
+ ** insert the select result into <table> from R..R+n
+ ** goto C
+ ** D: ...
+ */
+ addrInsTop = addrCont = sqlite3VdbeAddOp1(v, OP_Yield, dest.iSDParm);
+ VdbeCoverage(v);
+ }
+
+ /* Run the BEFORE and INSTEAD OF triggers, if there are any
+ */
+ endOfLoop = sqlite3VdbeMakeLabel(v);
+ if( tmask & TRIGGER_BEFORE ){
+ int regCols = sqlite3GetTempRange(pParse, pTab->nCol+1);
+
+ /* build the NEW.* reference row. Note that if there is an INTEGER
+ ** PRIMARY KEY into which a NULL is being inserted, that NULL will be
+ ** translated into a unique ID for the row. But on a BEFORE trigger,
+ ** we do not know what the unique ID will be (because the insert has
+ ** not happened yet) so we substitute a rowid of -1
+ */
+ if( ipkColumn<0 ){
+ sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
+ }else{
+ int j1;
+ assert( !withoutRowid );
+ if( useTempTable ){
+ sqlite3VdbeAddOp3(v, OP_Column, srcTab, ipkColumn, regCols);
+ }else{
+ assert( pSelect==0 ); /* Otherwise useTempTable is true */
+ sqlite3ExprCode(pParse, pList->a[ipkColumn].pExpr, regCols);
+ }
+ j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regCols); VdbeCoverage(v);
+ sqlite3VdbeAddOp2(v, OP_Integer, -1, regCols);
+ sqlite3VdbeJumpHere(v, j1);
+ sqlite3VdbeAddOp1(v, OP_MustBeInt, regCols); VdbeCoverage(v);
+ }
+
+ /* Cannot have triggers on a virtual table. If it were possible,
+ ** this block would have to account for hidden column.
+ */
+ assert( !IsVirtual(pTab) );
+
+ /* Create the new column data
+ */
+ for(i=0; i<pTab->nCol; i++){
+ if( pColumn==0 ){
+ j = i;
+ }else{
+ for(j=0; j<pColumn->nId; j++){
+ if( pColumn->a[j].idx==i ) break;
+ }
+ }
+ if( (!useTempTable && !pList) || (pColumn && j>=pColumn->nId) ){
+ sqlite3ExprCode(pParse, pTab->aCol[i].pDflt, regCols+i+1);
+ }else if( useTempTable ){
+ sqlite3VdbeAddOp3(v, OP_Column, srcTab, j, regCols+i+1);
+ }else{
+ assert( pSelect==0 ); /* Otherwise useTempTable is true */
+ sqlite3ExprCodeAndCache(pParse, pList->a[j].pExpr, regCols+i+1);
+ }
+ }
+
+ /* If this is an INSERT on a view with an INSTEAD OF INSERT trigger,
+ ** do not attempt any conversions before assembling the record.
+ ** If this is a real table, attempt conversions as required by the
+ ** table column affinities.
+ */
+ if( !isView ){
+ sqlite3TableAffinity(v, pTab, regCols+1);
+ }
+
+ /* Fire BEFORE or INSTEAD OF triggers */
+ sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_BEFORE,
+ pTab, regCols-pTab->nCol-1, onError, endOfLoop);
+
+ sqlite3ReleaseTempRange(pParse, regCols, pTab->nCol+1);
+ }
+
+ /* Compute the content of the next row to insert into a range of
+ ** registers beginning at regIns.
+ */
+ if( !isView ){
+ if( IsVirtual(pTab) ){
+ /* The row that the VUpdate opcode will delete: none */
+ sqlite3VdbeAddOp2(v, OP_Null, 0, regIns);
+ }
+ if( ipkColumn>=0 ){
+ if( useTempTable ){
+ sqlite3VdbeAddOp3(v, OP_Column, srcTab, ipkColumn, regRowid);
+ }else if( pSelect ){
+ sqlite3VdbeAddOp2(v, OP_Copy, regFromSelect+ipkColumn, regRowid);
+ }else{
+ VdbeOp *pOp;
+ sqlite3ExprCode(pParse, pList->a[ipkColumn].pExpr, regRowid);
+ pOp = sqlite3VdbeGetOp(v, -1);
+ if( ALWAYS(pOp) && pOp->opcode==OP_Null && !IsVirtual(pTab) ){
+ appendFlag = 1;
+ pOp->opcode = OP_NewRowid;
+ pOp->p1 = iDataCur;
+ pOp->p2 = regRowid;
+ pOp->p3 = regAutoinc;
+ }
+ }
+ /* If the PRIMARY KEY expression is NULL, then use OP_NewRowid
+ ** to generate a unique primary key value.
+ */
+ if( !appendFlag ){
+ int j1;
+ if( !IsVirtual(pTab) ){
+ j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regRowid); VdbeCoverage(v);
+ sqlite3VdbeAddOp3(v, OP_NewRowid, iDataCur, regRowid, regAutoinc);
+ sqlite3VdbeJumpHere(v, j1);
+ }else{
+ j1 = sqlite3VdbeCurrentAddr(v);
+ sqlite3VdbeAddOp2(v, OP_IsNull, regRowid, j1+2); VdbeCoverage(v);
+ }
+ sqlite3VdbeAddOp1(v, OP_MustBeInt, regRowid); VdbeCoverage(v);
+ }
+ }else if( IsVirtual(pTab) || withoutRowid ){
+ sqlite3VdbeAddOp2(v, OP_Null, 0, regRowid);
+ }else{
+ sqlite3VdbeAddOp3(v, OP_NewRowid, iDataCur, regRowid, regAutoinc);
+ appendFlag = 1;
+ }
+ autoIncStep(pParse, regAutoinc, regRowid);
+
+ /* Compute data for all columns of the new entry, beginning
+ ** with the first column.
+ */
+ nHidden = 0;
+ for(i=0; i<pTab->nCol; i++){
+ int iRegStore = regRowid+1+i;
+ if( i==pTab->iPKey ){
+ /* The value of the INTEGER PRIMARY KEY column is always a NULL.
+ ** Whenever this column is read, the rowid will be substituted
+ ** in its place. Hence, fill this column with a NULL to avoid
+ ** taking up data space with information that will never be used.
+ ** As there may be shallow copies of this value, make it a soft-NULL */
+ sqlite3VdbeAddOp1(v, OP_SoftNull, iRegStore);
+ continue;
+ }
+ if( pColumn==0 ){
+ if( IsHiddenColumn(&pTab->aCol[i]) ){
+ assert( IsVirtual(pTab) );
+ j = -1;
+ nHidden++;
+ }else{
+ j = i - nHidden;
+ }
+ }else{
+ for(j=0; j<pColumn->nId; j++){
+ if( pColumn->a[j].idx==i ) break;
+ }
+ }
+ if( j<0 || nColumn==0 || (pColumn && j>=pColumn->nId) ){
+ sqlite3ExprCodeFactorable(pParse, pTab->aCol[i].pDflt, iRegStore);
+ }else if( useTempTable ){
+ sqlite3VdbeAddOp3(v, OP_Column, srcTab, j, iRegStore);
+ }else if( pSelect ){
+ if( regFromSelect!=regData ){
+ sqlite3VdbeAddOp2(v, OP_SCopy, regFromSelect+j, iRegStore);
+ }
+ }else{
+ sqlite3ExprCode(pParse, pList->a[j].pExpr, iRegStore);
+ }
+ }
+
+ /* Generate code to check constraints and generate index keys and
+ ** do the insertion.
+ */
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+ if( IsVirtual(pTab) ){
+ const char *pVTab = (const char *)sqlite3GetVTable(db, pTab);
+ sqlite3VtabMakeWritable(pParse, pTab);
+ sqlite3VdbeAddOp4(v, OP_VUpdate, 1, pTab->nCol+2, regIns, pVTab, P4_VTAB);
+ sqlite3VdbeChangeP5(v, onError==OE_Default ? OE_Abort : onError);
+ sqlite3MayAbort(pParse);
+ }else
+#endif
+ {
+ int isReplace; /* Set to true if constraints may cause a replace */
+ sqlite3GenerateConstraintChecks(pParse, pTab, aRegIdx, iDataCur, iIdxCur,
+ regIns, 0, ipkColumn>=0, onError, endOfLoop, &isReplace
+ );
+ sqlite3FkCheck(pParse, pTab, 0, regIns, 0, 0);
+ sqlite3CompleteInsertion(pParse, pTab, iDataCur, iIdxCur,
+ regIns, aRegIdx, 0, appendFlag, isReplace==0);
+ }
+ }
+
+ /* Update the count of rows that are inserted
+ */
+ if( (db->flags & SQLITE_CountRows)!=0 ){
+ sqlite3VdbeAddOp2(v, OP_AddImm, regRowCount, 1);
+ }
+
+ if( pTrigger ){
+ /* Code AFTER triggers */
+ sqlite3CodeRowTrigger(pParse, pTrigger, TK_INSERT, 0, TRIGGER_AFTER,
+ pTab, regData-2-pTab->nCol, onError, endOfLoop);
+ }
+
+ /* The bottom of the main insertion loop, if the data source
+ ** is a SELECT statement.
+ */
+ sqlite3VdbeResolveLabel(v, endOfLoop);
+ if( useTempTable ){
+ sqlite3VdbeAddOp2(v, OP_Next, srcTab, addrCont); VdbeCoverage(v);
+ sqlite3VdbeJumpHere(v, addrInsTop);
+ sqlite3VdbeAddOp1(v, OP_Close, srcTab);
+ }else if( pSelect ){
+ sqlite3VdbeAddOp2(v, OP_Goto, 0, addrCont);
+ sqlite3VdbeJumpHere(v, addrInsTop);
+ }
+
+ if( !IsVirtual(pTab) && !isView ){
+ /* Close all tables opened */
+ if( iDataCur<iIdxCur ) sqlite3VdbeAddOp1(v, OP_Close, iDataCur);
+ for(idx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){
+ sqlite3VdbeAddOp1(v, OP_Close, idx+iIdxCur);
+ }
+ }
+
+insert_end:
+ /* Update the sqlite_sequence table by storing the content of the
+ ** maximum rowid counter values recorded while inserting into
+ ** autoincrement tables.
+ */
+ if( pParse->nested==0 && pParse->pTriggerTab==0 ){
+ sqlite3AutoincrementEnd(pParse);
+ }
+
+ /*
+ ** Return the number of rows inserted. If this routine is
+ ** generating code because of a call to sqlite3NestedParse(), do not
+ ** invoke the callback function.
+ */
+ if( (db->flags&SQLITE_CountRows) && !pParse->nested && !pParse->pTriggerTab ){
+ sqlite3VdbeAddOp2(v, OP_ResultRow, regRowCount, 1);
+ sqlite3VdbeSetNumCols(v, 1);
+ sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "rows inserted", SQLITE_STATIC);
+ }
+
+insert_cleanup:
+ sqlite3SrcListDelete(db, pTabList);
+ sqlite3ExprListDelete(db, pList);
+ sqlite3SelectDelete(db, pSelect);
+ sqlite3IdListDelete(db, pColumn);
+ sqlite3DbFree(db, aRegIdx);
+}
+
+/* Make sure "isView" and other macros defined above are undefined. Otherwise
+** they may interfere with compilation of other functions in this file
+** (or in another file, if this file becomes part of the amalgamation). */
+#ifdef isView
+ #undef isView
+#endif
+#ifdef pTrigger
+ #undef pTrigger
+#endif
+#ifdef tmask
+ #undef tmask
+#endif
+
+/*
+** Generate code to do constraint checks prior to an INSERT or an UPDATE
+** on table pTab.
+**
+** The regNewData parameter is the first register in a range that contains
+** the data to be inserted or the data after the update. There will be
+** pTab->nCol+1 registers in this range. The first register (the one
+** that regNewData points to) will contain the new rowid, or NULL in the
+** case of a WITHOUT ROWID table. The second register in the range will
+** contain the content of the first table column. The third register will
+** contain the content of the second table column. And so forth.
+**
+** The regOldData parameter is similar to regNewData except that it contains
+** the data prior to an UPDATE rather than afterwards. regOldData is zero
+** for an INSERT. This routine can distinguish between UPDATE and INSERT by
+** checking regOldData for zero.
+**
+** For an UPDATE, the pkChng boolean is true if the true primary key (the
+** rowid for a normal table or the PRIMARY KEY for a WITHOUT ROWID table)
+** might be modified by the UPDATE. If pkChng is false, then the key of
+** the iDataCur content table is guaranteed to be unchanged by the UPDATE.
+**
+** For an INSERT, the pkChng boolean indicates whether or not the rowid
+** was explicitly specified as part of the INSERT statement. If pkChng
+** is zero, it means that the either rowid is computed automatically or
+** that the table is a WITHOUT ROWID table and has no rowid. On an INSERT,
+** pkChng will only be true if the INSERT statement provides an integer
+** value for either the rowid column or its INTEGER PRIMARY KEY alias.
+**
+** The code generated by this routine will store new index entries into
+** registers identified by aRegIdx[]. No index entry is created for
+** indices where aRegIdx[i]==0. The order of indices in aRegIdx[] is
+** the same as the order of indices on the linked list of indices
+** at pTab->pIndex.
+**
+** The caller must have already opened writeable cursors on the main
+** table and all applicable indices (that is to say, all indices for which
+** aRegIdx[] is not zero). iDataCur is the cursor for the main table when
+** inserting or updating a rowid table, or the cursor for the PRIMARY KEY
+** index when operating on a WITHOUT ROWID table. iIdxCur is the cursor
+** for the first index in the pTab->pIndex list. Cursors for other indices
+** are at iIdxCur+N for the N-th element of the pTab->pIndex list.
+**
+** This routine also generates code to check constraints. NOT NULL,
+** CHECK, and UNIQUE constraints are all checked. If a constraint fails,
+** then the appropriate action is performed. There are five possible
+** actions: ROLLBACK, ABORT, FAIL, REPLACE, and IGNORE.
+**
+** Constraint type Action What Happens
+** --------------- ---------- ----------------------------------------
+** any ROLLBACK The current transaction is rolled back and
+** sqlite3_step() returns immediately with a
+** return code of SQLITE_CONSTRAINT.
+**
+** any ABORT Back out changes from the current command
+** only (do not do a complete rollback) then
+** cause sqlite3_step() to return immediately
+** with SQLITE_CONSTRAINT.
+**
+** any FAIL Sqlite3_step() returns immediately with a
+** return code of SQLITE_CONSTRAINT. The
+** transaction is not rolled back and any
+** changes to prior rows are retained.
+**
+** any IGNORE The attempt in insert or update the current
+** row is skipped, without throwing an error.
+** Processing continues with the next row.
+** (There is an immediate jump to ignoreDest.)
+**
+** NOT NULL REPLACE The NULL value is replace by the default
+** value for that column. If the default value
+** is NULL, the action is the same as ABORT.
+**
+** UNIQUE REPLACE The other row that conflicts with the row
+** being inserted is removed.
+**
+** CHECK REPLACE Illegal. The results in an exception.
+**
+** Which action to take is determined by the overrideError parameter.
+** Or if overrideError==OE_Default, then the pParse->onError parameter
+** is used. Or if pParse->onError==OE_Default then the onError value
+** for the constraint is used.
+*/
+void sqlite3GenerateConstraintChecks(
+ Parse *pParse, /* The parser context */
+ Table *pTab, /* The table being inserted or updated */
+ int *aRegIdx, /* Use register aRegIdx[i] for index i. 0 for unused */
+ int iDataCur, /* Canonical data cursor (main table or PK index) */
+ int iIdxCur, /* First index cursor */
+ int regNewData, /* First register in a range holding values to insert */
+ int regOldData, /* Previous content. 0 for INSERTs */
+ u8 pkChng, /* Non-zero if the rowid or PRIMARY KEY changed */
+ u8 overrideError, /* Override onError to this if not OE_Default */
+ int ignoreDest, /* Jump to this label on an OE_Ignore resolution */
+ int *pbMayReplace /* OUT: Set to true if constraint may cause a replace */
+){
+ Vdbe *v; /* VDBE under constrution */
+ Index *pIdx; /* Pointer to one of the indices */
+ Index *pPk = 0; /* The PRIMARY KEY index */
+ sqlite3 *db; /* Database connection */
+ int i; /* loop counter */
+ int ix; /* Index loop counter */
+ int nCol; /* Number of columns */
+ int onError; /* Conflict resolution strategy */
+ int j1; /* Address of jump instruction */
+ int seenReplace = 0; /* True if REPLACE is used to resolve INT PK conflict */
+ int nPkField; /* Number of fields in PRIMARY KEY. 1 for ROWID tables */
+ int ipkTop = 0; /* Top of the rowid change constraint check */
+ int ipkBottom = 0; /* Bottom of the rowid change constraint check */
+ u8 isUpdate; /* True if this is an UPDATE operation */
+ u8 bAffinityDone = 0; /* True if the OP_Affinity operation has been run */
+ int regRowid = -1; /* Register holding ROWID value */
+
+ isUpdate = regOldData!=0;
+ db = pParse->db;
+ v = sqlite3GetVdbe(pParse);
+ assert( v!=0 );
+ assert( pTab->pSelect==0 ); /* This table is not a VIEW */
+ nCol = pTab->nCol;
+
+ /* pPk is the PRIMARY KEY index for WITHOUT ROWID tables and NULL for
+ ** normal rowid tables. nPkField is the number of key fields in the
+ ** pPk index or 1 for a rowid table. In other words, nPkField is the
+ ** number of fields in the true primary key of the table. */
+ if( HasRowid(pTab) ){
+ pPk = 0;
+ nPkField = 1;
+ }else{
+ pPk = sqlite3PrimaryKeyIndex(pTab);
+ nPkField = pPk->nKeyCol;
+ }
+
+ /* Record that this module has started */
+ VdbeModuleComment((v, "BEGIN: GenCnstCks(%d,%d,%d,%d,%d)",
+ iDataCur, iIdxCur, regNewData, regOldData, pkChng));
+
+ /* Test all NOT NULL constraints.
+ */
+ for(i=0; i<nCol; i++){
+ if( i==pTab->iPKey ){
+ continue;
+ }
+ onError = pTab->aCol[i].notNull;
+ if( onError==OE_None ) continue;
+ if( overrideError!=OE_Default ){
+ onError = overrideError;
+ }else if( onError==OE_Default ){
+ onError = OE_Abort;
+ }
+ if( onError==OE_Replace && pTab->aCol[i].pDflt==0 ){
+ onError = OE_Abort;
+ }
+ assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
+ || onError==OE_Ignore || onError==OE_Replace );
+ switch( onError ){
+ case OE_Abort:
+ sqlite3MayAbort(pParse);
+ /* Fall through */
+ case OE_Rollback:
+ case OE_Fail: {
+ char *zMsg = sqlite3MPrintf(db, "%s.%s", pTab->zName,
+ pTab->aCol[i].zName);
+ sqlite3VdbeAddOp4(v, OP_HaltIfNull, SQLITE_CONSTRAINT_NOTNULL, onError,
+ regNewData+1+i, zMsg, P4_DYNAMIC);
+ sqlite3VdbeChangeP5(v, P5_ConstraintNotNull);
+ VdbeCoverage(v);
+ break;
+ }
+ case OE_Ignore: {
+ sqlite3VdbeAddOp2(v, OP_IsNull, regNewData+1+i, ignoreDest);
+ VdbeCoverage(v);
+ break;
+ }
+ default: {
+ assert( onError==OE_Replace );
+ j1 = sqlite3VdbeAddOp1(v, OP_NotNull, regNewData+1+i); VdbeCoverage(v);
+ sqlite3ExprCode(pParse, pTab->aCol[i].pDflt, regNewData+1+i);
+ sqlite3VdbeJumpHere(v, j1);
+ break;
+ }
+ }
+ }
+
+ /* Test all CHECK constraints
+ */
+#ifndef SQLITE_OMIT_CHECK
+ if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
+ ExprList *pCheck = pTab->pCheck;
+ pParse->ckBase = regNewData+1;
+ onError = overrideError!=OE_Default ? overrideError : OE_Abort;
+ for(i=0; i<pCheck->nExpr; i++){
+ int allOk = sqlite3VdbeMakeLabel(v);
+ sqlite3ExprIfTrue(pParse, pCheck->a[i].pExpr, allOk, SQLITE_JUMPIFNULL);
+ if( onError==OE_Ignore ){
+ sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
+ }else{
+ char *zName = pCheck->a[i].zName;
+ if( zName==0 ) zName = pTab->zName;
+ if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-15569-63625 */
+ sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_CHECK,
+ onError, zName, P4_TRANSIENT,
+ P5_ConstraintCheck);
+ }
+ sqlite3VdbeResolveLabel(v, allOk);
+ }
+ }
+#endif /* !defined(SQLITE_OMIT_CHECK) */
+
+ /* If rowid is changing, make sure the new rowid does not previously
+ ** exist in the table.
+ */
+ if( pkChng && pPk==0 ){
+ int addrRowidOk = sqlite3VdbeMakeLabel(v);
+
+ /* Figure out what action to take in case of a rowid collision */
+ onError = pTab->keyConf;
+ if( overrideError!=OE_Default ){
+ onError = overrideError;
+ }else if( onError==OE_Default ){
+ onError = OE_Abort;
+ }
+
+ if( isUpdate ){
+ /* pkChng!=0 does not mean that the rowid has change, only that
+ ** it might have changed. Skip the conflict logic below if the rowid
+ ** is unchanged. */
+ sqlite3VdbeAddOp3(v, OP_Eq, regNewData, addrRowidOk, regOldData);
+ sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+ VdbeCoverage(v);
+ }
+
+ /* If the response to a rowid conflict is REPLACE but the response
+ ** to some other UNIQUE constraint is FAIL or IGNORE, then we need
+ ** to defer the running of the rowid conflict checking until after
+ ** the UNIQUE constraints have run.
+ */
+ if( onError==OE_Replace && overrideError!=OE_Replace ){
+ for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
+ if( pIdx->onError==OE_Ignore || pIdx->onError==OE_Fail ){
+ ipkTop = sqlite3VdbeAddOp0(v, OP_Goto);
+ break;
+ }
+ }
+ }
+
+ /* Check to see if the new rowid already exists in the table. Skip
+ ** the following conflict logic if it does not. */
+ sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, addrRowidOk, regNewData);
+ VdbeCoverage(v);
+
+ /* Generate code that deals with a rowid collision */
+ switch( onError ){
+ default: {
+ onError = OE_Abort;
+ /* Fall thru into the next case */
+ }
+ case OE_Rollback:
+ case OE_Abort:
+ case OE_Fail: {
+ sqlite3RowidConstraint(pParse, onError, pTab);
+ break;
+ }
+ case OE_Replace: {
+ /* If there are DELETE triggers on this table and the
+ ** recursive-triggers flag is set, call GenerateRowDelete() to
+ ** remove the conflicting row from the table. This will fire
+ ** the triggers and remove both the table and index b-tree entries.
+ **
+ ** Otherwise, if there are no triggers or the recursive-triggers
+ ** flag is not set, but the table has one or more indexes, call
+ ** GenerateRowIndexDelete(). This removes the index b-tree entries
+ ** only. The table b-tree entry will be replaced by the new entry
+ ** when it is inserted.
+ **
+ ** If either GenerateRowDelete() or GenerateRowIndexDelete() is called,
+ ** also invoke MultiWrite() to indicate that this VDBE may require
+ ** statement rollback (if the statement is aborted after the delete
+ ** takes place). Earlier versions called sqlite3MultiWrite() regardless,
+ ** but being more selective here allows statements like:
+ **
+ ** REPLACE INTO t(rowid) VALUES($newrowid)
+ **
+ ** to run without a statement journal if there are no indexes on the
+ ** table.
+ */
+ Trigger *pTrigger = 0;
+ if( db->flags&SQLITE_RecTriggers ){
+ pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
+ }
+ if( pTrigger || sqlite3FkRequired(pParse, pTab, 0, 0) ){
+ sqlite3MultiWrite(pParse);
+ sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
+ regNewData, 1, 0, OE_Replace, 1);
+ }else if( pTab->pIndex ){
+ sqlite3MultiWrite(pParse);
+ sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur, 0);
+ }
+ seenReplace = 1;
+ break;
+ }
+ case OE_Ignore: {
+ /*assert( seenReplace==0 );*/
+ sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
+ break;
+ }
+ }
+ sqlite3VdbeResolveLabel(v, addrRowidOk);
+ if( ipkTop ){
+ ipkBottom = sqlite3VdbeAddOp0(v, OP_Goto);
+ sqlite3VdbeJumpHere(v, ipkTop);
+ }
+ }
+
+ /* Test all UNIQUE constraints by creating entries for each UNIQUE
+ ** index and making sure that duplicate entries do not already exist.
+ ** Compute the revised record entries for indices as we go.
+ **
+ ** This loop also handles the case of the PRIMARY KEY index for a
+ ** WITHOUT ROWID table.
+ */
+ for(ix=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, ix++){
+ int regIdx; /* Range of registers hold conent for pIdx */
+ int regR; /* Range of registers holding conflicting PK */
+ int iThisCur; /* Cursor for this UNIQUE index */
+ int addrUniqueOk; /* Jump here if the UNIQUE constraint is satisfied */
+
+ if( aRegIdx[ix]==0 ) continue; /* Skip indices that do not change */
+ if( bAffinityDone==0 ){
+ sqlite3TableAffinity(v, pTab, regNewData+1);
+ bAffinityDone = 1;
+ }
+ iThisCur = iIdxCur+ix;
+ addrUniqueOk = sqlite3VdbeMakeLabel(v);
+
+ /* Skip partial indices for which the WHERE clause is not true */
+ if( pIdx->pPartIdxWhere ){
+ sqlite3VdbeAddOp2(v, OP_Null, 0, aRegIdx[ix]);
+ pParse->ckBase = regNewData+1;
+ sqlite3ExprIfFalse(pParse, pIdx->pPartIdxWhere, addrUniqueOk,
+ SQLITE_JUMPIFNULL);
+ pParse->ckBase = 0;
+ }
+
+ /* Create a record for this index entry as it should appear after
+ ** the insert or update. Store that record in the aRegIdx[ix] register
+ */
+ regIdx = sqlite3GetTempRange(pParse, pIdx->nColumn);
+ for(i=0; i<pIdx->nColumn; i++){
+ int iField = pIdx->aiColumn[i];
+ int x;
+ if( iField<0 || iField==pTab->iPKey ){
+ if( regRowid==regIdx+i ) continue; /* ROWID already in regIdx+i */
+ x = regNewData;
+ regRowid = pIdx->pPartIdxWhere ? -1 : regIdx+i;
+ }else{
+ x = iField + regNewData + 1;
+ }
+ sqlite3VdbeAddOp2(v, OP_SCopy, x, regIdx+i);
+ VdbeComment((v, "%s", iField<0 ? "rowid" : pTab->aCol[iField].zName));
+ }
+ sqlite3VdbeAddOp3(v, OP_MakeRecord, regIdx, pIdx->nColumn, aRegIdx[ix]);
+ VdbeComment((v, "for %s", pIdx->zName));
+ sqlite3ExprCacheAffinityChange(pParse, regIdx, pIdx->nColumn);
+
+ /* In an UPDATE operation, if this index is the PRIMARY KEY index
+ ** of a WITHOUT ROWID table and there has been no change the
+ ** primary key, then no collision is possible. The collision detection
+ ** logic below can all be skipped. */
+ if( isUpdate && pPk==pIdx && pkChng==0 ){
+ sqlite3VdbeResolveLabel(v, addrUniqueOk);
+ continue;
+ }
+
+ /* Find out what action to take in case there is a uniqueness conflict */
+ onError = pIdx->onError;
+ if( onError==OE_None ){
+ sqlite3ReleaseTempRange(pParse, regIdx, pIdx->nColumn);
+ sqlite3VdbeResolveLabel(v, addrUniqueOk);
+ continue; /* pIdx is not a UNIQUE index */
+ }
+ if( overrideError!=OE_Default ){
+ onError = overrideError;
+ }else if( onError==OE_Default ){
+ onError = OE_Abort;
+ }
+
+ /* Check to see if the new index entry will be unique */
+ sqlite3VdbeAddOp4Int(v, OP_NoConflict, iThisCur, addrUniqueOk,
+ regIdx, pIdx->nKeyCol); VdbeCoverage(v);
+
+ /* Generate code to handle collisions */
+ regR = (pIdx==pPk) ? regIdx : sqlite3GetTempRange(pParse, nPkField);
+ if( isUpdate || onError==OE_Replace ){
+ if( HasRowid(pTab) ){
+ sqlite3VdbeAddOp2(v, OP_IdxRowid, iThisCur, regR);
+ /* Conflict only if the rowid of the existing index entry
+ ** is different from old-rowid */
+ if( isUpdate ){
+ sqlite3VdbeAddOp3(v, OP_Eq, regR, addrUniqueOk, regOldData);
+ sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+ VdbeCoverage(v);
+ }
+ }else{
+ int x;
+ /* Extract the PRIMARY KEY from the end of the index entry and
+ ** store it in registers regR..regR+nPk-1 */
+ if( pIdx!=pPk ){
+ for(i=0; i<pPk->nKeyCol; i++){
+ x = sqlite3ColumnOfIndex(pIdx, pPk->aiColumn[i]);
+ sqlite3VdbeAddOp3(v, OP_Column, iThisCur, x, regR+i);
+ VdbeComment((v, "%s.%s", pTab->zName,
+ pTab->aCol[pPk->aiColumn[i]].zName));
+ }
+ }
+ if( isUpdate ){
+ /* If currently processing the PRIMARY KEY of a WITHOUT ROWID
+ ** table, only conflict if the new PRIMARY KEY values are actually
+ ** different from the old.
+ **
+ ** For a UNIQUE index, only conflict if the PRIMARY KEY values
+ ** of the matched index row are different from the original PRIMARY
+ ** KEY values of this row before the update. */
+ int addrJump = sqlite3VdbeCurrentAddr(v)+pPk->nKeyCol;
+ int op = OP_Ne;
+ int regCmp = (IsPrimaryKeyIndex(pIdx) ? regIdx : regR);
+
+ for(i=0; i<pPk->nKeyCol; i++){
+ char *p4 = (char*)sqlite3LocateCollSeq(pParse, pPk->azColl[i]);
+ x = pPk->aiColumn[i];
+ if( i==(pPk->nKeyCol-1) ){
+ addrJump = addrUniqueOk;
+ op = OP_Eq;
+ }
+ sqlite3VdbeAddOp4(v, op,
+ regOldData+1+x, addrJump, regCmp+i, p4, P4_COLLSEQ
+ );
+ sqlite3VdbeChangeP5(v, SQLITE_NOTNULL);
+ VdbeCoverageIf(v, op==OP_Eq);
+ VdbeCoverageIf(v, op==OP_Ne);
+ }
+ }
+ }
+ }
+
+ /* Generate code that executes if the new index entry is not unique */
+ assert( onError==OE_Rollback || onError==OE_Abort || onError==OE_Fail
+ || onError==OE_Ignore || onError==OE_Replace );
+ switch( onError ){
+ case OE_Rollback:
+ case OE_Abort:
+ case OE_Fail: {
+ sqlite3UniqueConstraint(pParse, onError, pIdx);
+ break;
+ }
+ case OE_Ignore: {
+ sqlite3VdbeAddOp2(v, OP_Goto, 0, ignoreDest);
+ break;
+ }
+ default: {
+ Trigger *pTrigger = 0;
+ assert( onError==OE_Replace );
+ sqlite3MultiWrite(pParse);
+ if( db->flags&SQLITE_RecTriggers ){
+ pTrigger = sqlite3TriggersExist(pParse, pTab, TK_DELETE, 0, 0);
+ }
+ sqlite3GenerateRowDelete(pParse, pTab, pTrigger, iDataCur, iIdxCur,
+ regR, nPkField, 0, OE_Replace, pIdx==pPk);
+ seenReplace = 1;
+ break;
+ }
+ }
+ sqlite3VdbeResolveLabel(v, addrUniqueOk);
+ sqlite3ReleaseTempRange(pParse, regIdx, pIdx->nColumn);
+ if( regR!=regIdx ) sqlite3ReleaseTempRange(pParse, regR, nPkField);
+ }
+ if( ipkTop ){
+ sqlite3VdbeAddOp2(v, OP_Goto, 0, ipkTop+1);
+ sqlite3VdbeJumpHere(v, ipkBottom);
+ }
+
+ *pbMayReplace = seenReplace;
+ VdbeModuleComment((v, "END: GenCnstCks(%d)", seenReplace));
+}
+
+/*
+** This routine generates code to finish the INSERT or UPDATE operation
+** that was started by a prior call to sqlite3GenerateConstraintChecks.
+** A consecutive range of registers starting at regNewData contains the
+** rowid and the content to be inserted.
+**
+** The arguments to this routine should be the same as the first six
+** arguments to sqlite3GenerateConstraintChecks.
+*/
+void sqlite3CompleteInsertion(
+ Parse *pParse, /* The parser context */
+ Table *pTab, /* the table into which we are inserting */
+ int iDataCur, /* Cursor of the canonical data source */
+ int iIdxCur, /* First index cursor */
+ int regNewData, /* Range of content */
+ int *aRegIdx, /* Register used by each index. 0 for unused indices */
+ int isUpdate, /* True for UPDATE, False for INSERT */
+ int appendBias, /* True if this is likely to be an append */
+ int useSeekResult /* True to set the USESEEKRESULT flag on OP_[Idx]Insert */
+){
+ Vdbe *v; /* Prepared statements under construction */
+ Index *pIdx; /* An index being inserted or updated */
+ u8 pik_flags; /* flag values passed to the btree insert */
+ int regData; /* Content registers (after the rowid) */
+ int regRec; /* Register holding assembled record for the table */
+ int i; /* Loop counter */
+ u8 bAffinityDone = 0; /* True if OP_Affinity has been run already */
+
+ v = sqlite3GetVdbe(pParse);
+ assert( v!=0 );
+ assert( pTab->pSelect==0 ); /* This table is not a VIEW */
+ for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
+ if( aRegIdx[i]==0 ) continue;
+ bAffinityDone = 1;
+ if( pIdx->pPartIdxWhere ){
+ sqlite3VdbeAddOp2(v, OP_IsNull, aRegIdx[i], sqlite3VdbeCurrentAddr(v)+2);
+ VdbeCoverage(v);
+ }
+ sqlite3VdbeAddOp2(v, OP_IdxInsert, iIdxCur+i, aRegIdx[i]);
+ pik_flags = 0;
+ if( useSeekResult ) pik_flags = OPFLAG_USESEEKRESULT;
+ if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) ){
+ assert( pParse->nested==0 );
+ pik_flags |= OPFLAG_NCHANGE;
+ }
+ if( pik_flags ) sqlite3VdbeChangeP5(v, pik_flags);
+ }
+ if( !HasRowid(pTab) ) return;
+ regData = regNewData + 1;
+ regRec = sqlite3GetTempReg(pParse);
+ sqlite3VdbeAddOp3(v, OP_MakeRecord, regData, pTab->nCol, regRec);
+ if( !bAffinityDone ) sqlite3TableAffinity(v, pTab, 0);
+ sqlite3ExprCacheAffinityChange(pParse, regData, pTab->nCol);
+ if( pParse->nested ){
+ pik_flags = 0;
+ }else{
+ pik_flags = OPFLAG_NCHANGE;
+ pik_flags |= (isUpdate?OPFLAG_ISUPDATE:OPFLAG_LASTROWID);
+ }
+ if( appendBias ){
+ pik_flags |= OPFLAG_APPEND;
+ }
+ if( useSeekResult ){
+ pik_flags |= OPFLAG_USESEEKRESULT;
+ }
+ sqlite3VdbeAddOp3(v, OP_Insert, iDataCur, regRec, regNewData);
+ if( !pParse->nested ){
+ sqlite3VdbeChangeP4(v, -1, pTab->zName, P4_TRANSIENT);
+ }
+ sqlite3VdbeChangeP5(v, pik_flags);
+}
+
+/*
+** Allocate cursors for the pTab table and all its indices and generate
+** code to open and initialized those cursors.
+**
+** The cursor for the object that contains the complete data (normally
+** the table itself, but the PRIMARY KEY index in the case of a WITHOUT
+** ROWID table) is returned in *piDataCur. The first index cursor is
+** returned in *piIdxCur. The number of indices is returned.
+**
+** Use iBase as the first cursor (either the *piDataCur for rowid tables
+** or the first index for WITHOUT ROWID tables) if it is non-negative.
+** If iBase is negative, then allocate the next available cursor.
+**
+** For a rowid table, *piDataCur will be exactly one less than *piIdxCur.
+** For a WITHOUT ROWID table, *piDataCur will be somewhere in the range
+** of *piIdxCurs, depending on where the PRIMARY KEY index appears on the
+** pTab->pIndex list.
+**
+** If pTab is a virtual table, then this routine is a no-op and the
+** *piDataCur and *piIdxCur values are left uninitialized.
+*/
+int sqlite3OpenTableAndIndices(
+ Parse *pParse, /* Parsing context */
+ Table *pTab, /* Table to be opened */
+ int op, /* OP_OpenRead or OP_OpenWrite */
+ int iBase, /* Use this for the table cursor, if there is one */
+ u8 *aToOpen, /* If not NULL: boolean for each table and index */
+ int *piDataCur, /* Write the database source cursor number here */
+ int *piIdxCur /* Write the first index cursor number here */
+){
+ int i;
+ int iDb;
+ int iDataCur;
+ Index *pIdx;
+ Vdbe *v;
+
+ assert( op==OP_OpenRead || op==OP_OpenWrite );
+ if( IsVirtual(pTab) ){
+ /* This routine is a no-op for virtual tables. Leave the output
+ ** variables *piDataCur and *piIdxCur uninitialized so that valgrind
+ ** can detect if they are used by mistake in the caller. */
+ return 0;
+ }
+ iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
+ v = sqlite3GetVdbe(pParse);
+ assert( v!=0 );
+ if( iBase<0 ) iBase = pParse->nTab;
+ iDataCur = iBase++;
+ if( piDataCur ) *piDataCur = iDataCur;
+ if( HasRowid(pTab) && (aToOpen==0 || aToOpen[0]) ){
+ sqlite3OpenTable(pParse, iDataCur, iDb, pTab, op);
+ }else{
+ sqlite3TableLock(pParse, iDb, pTab->tnum, op==OP_OpenWrite, pTab->zName);
+ }
+ if( piIdxCur ) *piIdxCur = iBase;
+ for(i=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){
+ int iIdxCur = iBase++;
+ assert( pIdx->pSchema==pTab->pSchema );
+ if( IsPrimaryKeyIndex(pIdx) && !HasRowid(pTab) && piDataCur ){
+ *piDataCur = iIdxCur;
+ }
+ if( aToOpen==0 || aToOpen[i+1] ){
+ sqlite3VdbeAddOp3(v, op, iIdxCur, pIdx->tnum, iDb);
+ sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
+ VdbeComment((v, "%s", pIdx->zName));
+ }
+ }
+ if( iBase>pParse->nTab ) pParse->nTab = iBase;
+ return i;
+}
+
+
+#ifdef SQLITE_TEST
+/*
+** The following global variable is incremented whenever the
+** transfer optimization is used. This is used for testing
+** purposes only - to make sure the transfer optimization really
+** is happening when it is supposed to.
+*/
+int sqlite3_xferopt_count;
+#endif /* SQLITE_TEST */
+
+
+#ifndef SQLITE_OMIT_XFER_OPT
+/*
+** Check to collation names to see if they are compatible.
+*/
+static int xferCompatibleCollation(const char *z1, const char *z2){
+ if( z1==0 ){
+ return z2==0;
+ }
+ if( z2==0 ){
+ return 0;
+ }
+ return sqlite3StrICmp(z1, z2)==0;
+}
+
+
+/*
+** Check to see if index pSrc is compatible as a source of data
+** for index pDest in an insert transfer optimization. The rules
+** for a compatible index:
+**
+** * The index is over the same set of columns
+** * The same DESC and ASC markings occurs on all columns
+** * The same onError processing (OE_Abort, OE_Ignore, etc)
+** * The same collating sequence on each column
+** * The index has the exact same WHERE clause
+*/
+static int xferCompatibleIndex(Index *pDest, Index *pSrc){
+ int i;
+ assert( pDest && pSrc );
+ assert( pDest->pTable!=pSrc->pTable );
+ if( pDest->nKeyCol!=pSrc->nKeyCol ){
+ return 0; /* Different number of columns */
+ }
+ if( pDest->onError!=pSrc->onError ){
+ return 0; /* Different conflict resolution strategies */
+ }
+ for(i=0; i<pSrc->nKeyCol; i++){
+ if( pSrc->aiColumn[i]!=pDest->aiColumn[i] ){
+ return 0; /* Different columns indexed */
+ }
+ if( pSrc->aSortOrder[i]!=pDest->aSortOrder[i] ){
+ return 0; /* Different sort orders */
+ }
+ if( !xferCompatibleCollation(pSrc->azColl[i],pDest->azColl[i]) ){
+ return 0; /* Different collating sequences */
+ }
+ }
+ if( sqlite3ExprCompare(pSrc->pPartIdxWhere, pDest->pPartIdxWhere, -1) ){
+ return 0; /* Different WHERE clauses */
+ }
+
+ /* If no test above fails then the indices must be compatible */
+ return 1;
+}
+
+/*
+** Attempt the transfer optimization on INSERTs of the form
+**
+** INSERT INTO tab1 SELECT * FROM tab2;
+**
+** The xfer optimization transfers raw records from tab2 over to tab1.
+** Columns are not decoded and reassembled, which greatly improves
+** performance. Raw index records are transferred in the same way.
+**
+** The xfer optimization is only attempted if tab1 and tab2 are compatible.
+** There are lots of rules for determining compatibility - see comments
+** embedded in the code for details.
+**
+** This routine returns TRUE if the optimization is guaranteed to be used.
+** Sometimes the xfer optimization will only work if the destination table
+** is empty - a factor that can only be determined at run-time. In that
+** case, this routine generates code for the xfer optimization but also
+** does a test to see if the destination table is empty and jumps over the
+** xfer optimization code if the test fails. In that case, this routine
+** returns FALSE so that the caller will know to go ahead and generate
+** an unoptimized transfer. This routine also returns FALSE if there
+** is no chance that the xfer optimization can be applied.
+**
+** This optimization is particularly useful at making VACUUM run faster.
+*/
+static int xferOptimization(
+ Parse *pParse, /* Parser context */
+ Table *pDest, /* The table we are inserting into */
+ Select *pSelect, /* A SELECT statement to use as the data source */
+ int onError, /* How to handle constraint errors */
+ int iDbDest /* The database of pDest */
+){
+ ExprList *pEList; /* The result set of the SELECT */
+ Table *pSrc; /* The table in the FROM clause of SELECT */
+ Index *pSrcIdx, *pDestIdx; /* Source and destination indices */
+ struct SrcList_item *pItem; /* An element of pSelect->pSrc */
+ int i; /* Loop counter */
+ int iDbSrc; /* The database of pSrc */
+ int iSrc, iDest; /* Cursors from source and destination */
+ int addr1, addr2; /* Loop addresses */
+ int emptyDestTest = 0; /* Address of test for empty pDest */
+ int emptySrcTest = 0; /* Address of test for empty pSrc */
+ Vdbe *v; /* The VDBE we are building */
+ int regAutoinc; /* Memory register used by AUTOINC */
+ int destHasUniqueIdx = 0; /* True if pDest has a UNIQUE index */
+ int regData, regRowid; /* Registers holding data and rowid */
+
+ if( pSelect==0 ){
+ return 0; /* Must be of the form INSERT INTO ... SELECT ... */
+ }
+ if( pParse->pWith || pSelect->pWith ){
+ /* Do not attempt to process this query if there are an WITH clauses
+ ** attached to it. Proceeding may generate a false "no such table: xxx"
+ ** error if pSelect reads from a CTE named "xxx". */
+ return 0;
+ }
+ if( sqlite3TriggerList(pParse, pDest) ){
+ return 0; /* tab1 must not have triggers */
+ }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+ if( pDest->tabFlags & TF_Virtual ){
+ return 0; /* tab1 must not be a virtual table */
+ }
+#endif
+ if( onError==OE_Default ){
+ if( pDest->iPKey>=0 ) onError = pDest->keyConf;
+ if( onError==OE_Default ) onError = OE_Abort;
+ }
+ assert(pSelect->pSrc); /* allocated even if there is no FROM clause */
+ if( pSelect->pSrc->nSrc!=1 ){
+ return 0; /* FROM clause must have exactly one term */
+ }
+ if( pSelect->pSrc->a[0].pSelect ){
+ return 0; /* FROM clause cannot contain a subquery */
+ }
+ if( pSelect->pWhere ){
+ return 0; /* SELECT may not have a WHERE clause */
+ }
+ if( pSelect->pOrderBy ){
+ return 0; /* SELECT may not have an ORDER BY clause */
+ }
+ /* Do not need to test for a HAVING clause. If HAVING is present but
+ ** there is no ORDER BY, we will get an error. */
+ if( pSelect->pGroupBy ){
+ return 0; /* SELECT may not have a GROUP BY clause */
+ }
+ if( pSelect->pLimit ){
+ return 0; /* SELECT may not have a LIMIT clause */
+ }
+ assert( pSelect->pOffset==0 ); /* Must be so if pLimit==0 */
+ if( pSelect->pPrior ){
+ return 0; /* SELECT may not be a compound query */
+ }
+ if( pSelect->selFlags & SF_Distinct ){
+ return 0; /* SELECT may not be DISTINCT */
+ }
+ pEList = pSelect->pEList;
+ assert( pEList!=0 );
+ if( pEList->nExpr!=1 ){
+ return 0; /* The result set must have exactly one column */
+ }
+ assert( pEList->a[0].pExpr );
+ if( pEList->a[0].pExpr->op!=TK_ALL ){
+ return 0; /* The result set must be the special operator "*" */
+ }
+
+ /* At this point we have established that the statement is of the
+ ** correct syntactic form to participate in this optimization. Now
+ ** we have to check the semantics.
+ */
+ pItem = pSelect->pSrc->a;
+ pSrc = sqlite3LocateTableItem(pParse, 0, pItem);
+ if( pSrc==0 ){
+ return 0; /* FROM clause does not contain a real table */
+ }
+ if( pSrc==pDest ){
+ return 0; /* tab1 and tab2 may not be the same table */
+ }
+ if( HasRowid(pDest)!=HasRowid(pSrc) ){
+ return 0; /* source and destination must both be WITHOUT ROWID or not */
+ }
+#ifndef SQLITE_OMIT_VIRTUALTABLE
+ if( pSrc->tabFlags & TF_Virtual ){
+ return 0; /* tab2 must not be a virtual table */
+ }
+#endif
+ if( pSrc->pSelect ){
+ return 0; /* tab2 may not be a view */
+ }
+ if( pDest->nCol!=pSrc->nCol ){
+ return 0; /* Number of columns must be the same in tab1 and tab2 */
+ }
+ if( pDest->iPKey!=pSrc->iPKey ){
+ return 0; /* Both tables must have the same INTEGER PRIMARY KEY */
+ }
+ for(i=0; i<pDest->nCol; i++){
+ Column *pDestCol = &pDest->aCol[i];
+ Column *pSrcCol = &pSrc->aCol[i];
+ if( pDestCol->affinity!=pSrcCol->affinity ){
+ return 0; /* Affinity must be the same on all columns */
+ }
+ if( !xferCompatibleCollation(pDestCol->zColl, pSrcCol->zColl) ){
+ return 0; /* Collating sequence must be the same on all columns */
+ }
+ if( pDestCol->notNull && !pSrcCol->notNull ){
+ return 0; /* tab2 must be NOT NULL if tab1 is */
+ }
+ /* Default values for second and subsequent columns need to match. */
+ if( i>0
+ && ((pDestCol->zDflt==0)!=(pSrcCol->zDflt==0)
+ || (pDestCol->zDflt && strcmp(pDestCol->zDflt, pSrcCol->zDflt)!=0))
+ ){
+ return 0; /* Default values must be the same for all columns */
+ }
+ }
+ for(pDestIdx=pDest->pIndex; pDestIdx; pDestIdx=pDestIdx->pNext){
+ if( IsUniqueIndex(pDestIdx) ){
+ destHasUniqueIdx = 1;
+ }
+ for(pSrcIdx=pSrc->pIndex; pSrcIdx; pSrcIdx=pSrcIdx->pNext){
+ if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
+ }
+ if( pSrcIdx==0 ){
+ return 0; /* pDestIdx has no corresponding index in pSrc */
+ }
+ }
+#ifndef SQLITE_OMIT_CHECK
+ if( pDest->pCheck && sqlite3ExprListCompare(pSrc->pCheck,pDest->pCheck,-1) ){
+ return 0; /* Tables have different CHECK constraints. Ticket #2252 */
+ }
+#endif
+#ifndef SQLITE_OMIT_FOREIGN_KEY
+ /* Disallow the transfer optimization if the destination table constains
+ ** any foreign key constraints. This is more restrictive than necessary.
+ ** But the main beneficiary of the transfer optimization is the VACUUM
+ ** command, and the VACUUM command disables foreign key constraints. So
+ ** the extra complication to make this rule less restrictive is probably
+ ** not worth the effort. Ticket [6284df89debdfa61db8073e062908af0c9b6118e]
+ */
+ if( (pParse->db->flags & SQLITE_ForeignKeys)!=0 && pDest->pFKey!=0 ){
+ return 0;
+ }
+#endif
+ if( (pParse->db->flags & SQLITE_CountRows)!=0 ){
+ return 0; /* xfer opt does not play well with PRAGMA count_changes */
+ }
+
+ /* If we get this far, it means that the xfer optimization is at
+ ** least a possibility, though it might only work if the destination
+ ** table (tab1) is initially empty.
+ */
+#ifdef SQLITE_TEST
+ sqlite3_xferopt_count++;
+#endif
+ iDbSrc = sqlite3SchemaToIndex(pParse->db, pSrc->pSchema);
+ v = sqlite3GetVdbe(pParse);
+ sqlite3CodeVerifySchema(pParse, iDbSrc);
+ iSrc = pParse->nTab++;
+ iDest = pParse->nTab++;
+ regAutoinc = autoIncBegin(pParse, iDbDest, pDest);
+ regData = sqlite3GetTempReg(pParse);
+ regRowid = sqlite3GetTempReg(pParse);
+ sqlite3OpenTable(pParse, iDest, iDbDest, pDest, OP_OpenWrite);
+ assert( HasRowid(pDest) || destHasUniqueIdx );
+ if( (pDest->iPKey<0 && pDest->pIndex!=0) /* (1) */
+ || destHasUniqueIdx /* (2) */
+ || (onError!=OE_Abort && onError!=OE_Rollback) /* (3) */
+ ){
+ /* In some circumstances, we are able to run the xfer optimization
+ ** only if the destination table is initially empty. This code makes
+ ** that determination. Conditions under which the destination must
+ ** be empty:
+ **
+ ** (1) There is no INTEGER PRIMARY KEY but there are indices.
+ ** (If the destination is not initially empty, the rowid fields
+ ** of index entries might need to change.)
+ **
+ ** (2) The destination has a unique index. (The xfer optimization
+ ** is unable to test uniqueness.)
+ **
+ ** (3) onError is something other than OE_Abort and OE_Rollback.
+ */
+ addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iDest, 0); VdbeCoverage(v);
+ emptyDestTest = sqlite3VdbeAddOp2(v, OP_Goto, 0, 0);
+ sqlite3VdbeJumpHere(v, addr1);
+ }
+ if( HasRowid(pSrc) ){
+ sqlite3OpenTable(pParse, iSrc, iDbSrc, pSrc, OP_OpenRead);
+ emptySrcTest = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0); VdbeCoverage(v);
+ if( pDest->iPKey>=0 ){
+ addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
+ addr2 = sqlite3VdbeAddOp3(v, OP_NotExists, iDest, 0, regRowid);
+ VdbeCoverage(v);
+ sqlite3RowidConstraint(pParse, onError, pDest);
+ sqlite3VdbeJumpHere(v, addr2);
+ autoIncStep(pParse, regAutoinc, regRowid);
+ }else if( pDest->pIndex==0 ){
+ addr1 = sqlite3VdbeAddOp2(v, OP_NewRowid, iDest, regRowid);
+ }else{
+ addr1 = sqlite3VdbeAddOp2(v, OP_Rowid, iSrc, regRowid);
+ assert( (pDest->tabFlags & TF_Autoincrement)==0 );
+ }
+ sqlite3VdbeAddOp2(v, OP_RowData, iSrc, regData);
+ sqlite3VdbeAddOp3(v, OP_Insert, iDest, regData, regRowid);
+ sqlite3VdbeChangeP5(v, OPFLAG_NCHANGE|OPFLAG_LASTROWID|OPFLAG_APPEND);
+ sqlite3VdbeChangeP4(v, -1, pDest->zName, 0);
+ sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1); VdbeCoverage(v);
+ sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
+ sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
+ }else{
+ sqlite3TableLock(pParse, iDbDest, pDest->tnum, 1, pDest->zName);
+ sqlite3TableLock(pParse, iDbSrc, pSrc->tnum, 0, pSrc->zName);
+ }
+ for(pDestIdx=pDest->pIndex; pDestIdx; pDestIdx=pDestIdx->pNext){
+ for(pSrcIdx=pSrc->pIndex; ALWAYS(pSrcIdx); pSrcIdx=pSrcIdx->pNext){
+ if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
+ }
+ assert( pSrcIdx );
+ sqlite3VdbeAddOp3(v, OP_OpenRead, iSrc, pSrcIdx->tnum, iDbSrc);
+ sqlite3VdbeSetP4KeyInfo(pParse, pSrcIdx);
+ VdbeComment((v, "%s", pSrcIdx->zName));
+ sqlite3VdbeAddOp3(v, OP_OpenWrite, iDest, pDestIdx->tnum, iDbDest);
+ sqlite3VdbeSetP4KeyInfo(pParse, pDestIdx);
+ sqlite3VdbeChangeP5(v, OPFLAG_BULKCSR);
+ VdbeComment((v, "%s", pDestIdx->zName));
+ addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0); VdbeCoverage(v);
+ sqlite3VdbeAddOp2(v, OP_RowKey, iSrc, regData);
+ sqlite3VdbeAddOp3(v, OP_IdxInsert, iDest, regData, 1);
+ sqlite3VdbeAddOp2(v, OP_Next, iSrc, addr1+1); VdbeCoverage(v);
+ sqlite3VdbeJumpHere(v, addr1);
+ sqlite3VdbeAddOp2(v, OP_Close, iSrc, 0);
+ sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
+ }
+ if( emptySrcTest ) sqlite3VdbeJumpHere(v, emptySrcTest);
+ sqlite3ReleaseTempReg(pParse, regRowid);
+ sqlite3ReleaseTempReg(pParse, regData);
+ if( emptyDestTest ){
+ sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_OK, 0);
+ sqlite3VdbeJumpHere(v, emptyDestTest);
+ sqlite3VdbeAddOp2(v, OP_Close, iDest, 0);
+ return 0;
+ }else{
+ return 1;
+ }
+}
+#endif /* SQLITE_OMIT_XFER_OPT */
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