[sql] Import SQLite 3.17.0.

third_party/sqlite/src/test/snapshot2.test

+# 2016 November 18
+#
+# 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 implements regression tests for SQLite library. The focus
+# of this file is the sqlite3_snapshot_xxx() APIs.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+ifcapable !snapshot {finish_test; return}
+set testprefix snapshot2
+
+# This test does not work with the inmemory_journal permutation. The reason
+# is that each connection opened as part of this permutation executes
+# "PRAGMA journal_mode=memory", which fails if the database is in wal mode
+# and there are one or more existing connections.
+if {[permutation]=="inmemory_journal"} {
+  finish_test
+  return
+}
+
+#-------------------------------------------------------------------------
+# Check that it is not possible to obtain a snapshot immediately after
+# a wal mode database with an empty wal file is opened. But it is after
+# the file has been written, even by some other connection.
+#
+do_execsql_test 1.0 {
+  PRAGMA journal_mode = wal;
+  CREATE TABLE t1(a, b, c);
+  INSERT INTO t1 VALUES(1, 2, 3);
+  INSERT INTO t1 VALUES(4, 5, 6);
+} {wal}
+
+db close
+do_test 1.1.1 { list [file exists test.db] [file exists test.db-wal] } {1 0}
+
+sqlite3 db test.db
+do_execsql_test 1.1.2 { SELECT * FROM t1 } {1 2 3 4 5 6}
+
+do_test 1.1.3 {
+  execsql BEGIN
+  list [catch { sqlite3_snapshot_get_blob db main } msg] $msg
+} {1 SQLITE_ERROR}
+execsql COMMIT
+
+do_test 1.1.4 {
+  execsql { INSERT INTO t1 VALUES(7, 8, 9) }
+  execsql BEGIN
+  string length [sqlite3_snapshot_get_blob db main]
+} 48
+execsql COMMIT
+
+db close
+do_test 1.2.1 { list [file exists test.db] [file exists test.db-wal] } {1 0}
+
+sqlite3 db test.db
+do_execsql_test 1.2.2 { SELECT * FROM t1 } {1 2 3 4 5 6 7 8 9}
+
+do_test 1.2.3 {
+  execsql BEGIN
+  list [catch { sqlite3_snapshot_get_blob db main } msg] $msg
+} {1 SQLITE_ERROR}
+execsql COMMIT
+
+do_test 1.2.4 {
+  sqlite3 db2 test.db
+  execsql { INSERT INTO t1 VALUES(10, 11, 12) } db2
+  execsql BEGIN
+  string length [sqlite3_snapshot_get_blob db main]
+} 48
+execsql COMMIT
+db2 close
+
+#-------------------------------------------------------------------------
+# Simple tests for sqlite3_snapshot_recover().
+#
+reset_db
+do_execsql_test 2.0 {
+  CREATE TABLE t1(x);
+  PRAGMA journal_mode = wal;
+  INSERT INTO t1 VALUES(1);
+  INSERT INTO t1 VALUES(2);
+} {wal}
+
+do_test 2.1 {
+  db trans { set snap [sqlite3_snapshot_get_blob db main] }
+  sqlite3_db_config db NO_CKPT_ON_CLOSE 1
+  db close
+  sqlite3 db test.db
+
+  execsql {SELECT * FROM sqlite_master}
+  execsql BEGIN
+  sqlite3_snapshot_open_blob db main $snap
+  execsql COMMIT;
+  execsql { INSERT INTO t1 VALUES(3); }
+} {}
+
+do_test 2.2 {
+  sqlite3_db_config db NO_CKPT_ON_CLOSE 1
+  db close
+  sqlite3 db test.db
+
+  execsql {SELECT * FROM sqlite_master}
+  execsql BEGIN
+  list [catch { sqlite3_snapshot_open_blob db main $snap } msg] $msg
+} {1 SQLITE_BUSY_SNAPSHOT}
+
+do_test 2.3 {
+  execsql COMMIT
+  sqlite3_snapshot_recover db main
+  execsql BEGIN
+  sqlite3_snapshot_open_blob db main $snap
+  execsql { SELECT * FROM t1 }
+} {1 2}
+
+do_test 2.4 {
+  execsql COMMIT
+  execsql { SELECT * FROM t1 }
+} {1 2 3}
+
+do_test 2.5 {
+  execsql { PRAGMA wal_checkpoint }
+  sqlite3_db_config db NO_CKPT_ON_CLOSE 1
+  db close
+  sqlite3 db test.db
+
+  sqlite3_snapshot_recover db main
+  execsql BEGIN
+  list [catch { sqlite3_snapshot_open_blob db main $snap } msg] $msg
+} {1 SQLITE_BUSY_SNAPSHOT}
+
+#-------------------------------------------------------------------------
+# Check that calling sqlite3_snapshot_recover() does not confuse the
+# pager cache.
+reset_db
+do_execsql_test 3.0 {
+  PRAGMA journal_mode = wal;
+  CREATE TABLE t1(x, y);
+  INSERT INTO t1 VALUES('a', 'b');
+  INSERT INTO t1 VALUES('c', 'd');
+} {wal}
+do_test 3.1 {
+  sqlite3 db2 test.db
+  execsql { INSERT INTO t1 VALUES('e', 'f') } db2
+  db2 close
+  sqlite3_snapshot_recover db main
+} {}
+do_execsql_test 3.2 {
+  SELECT * FROM t1;
+} {a b c d e f}
+
+#-------------------------------------------------------------------------
+# Check that sqlite3_snapshot_recover() returns an error if it is called
+# with an open read-transaction. Or on a database that does not exist. Or
+# on the temp database. Or on a db that is not in wal mode.
+#
+do_test 4.1 {
+  sqlite3_snapshot_recover db main
+} {}
+do_test 4.2 {
+  execsql {
+    BEGIN;
+      SELECT * FROM sqlite_master;
+  }
+  list [catch { sqlite3_snapshot_recover db main } msg] $msg
+} {1 SQLITE_ERROR}
+do_test 4.3 {
+  execsql COMMIT
+  sqlite3_snapshot_recover db main
+} {}
+do_test 4.4 {
+  list [catch { sqlite3_snapshot_recover db aux } msg] $msg
+} {1 SQLITE_ERROR}
+do_test 4.5 {
+  forcedelete test.db2
+  execsql {
+    ATTACH 'test.db2' AS aux;
+    PRAGMA aux.journal_mode = wal;
+    CREATE TABLE aux.t2(x, y);
+  }
+  list [catch { sqlite3_snapshot_recover db aux } msg] $msg
+} {0 {}}
+do_test 4.6 {
+  list [catch { sqlite3_snapshot_recover db temp } msg] $msg
+} {1 SQLITE_ERROR}
+do_test 4.7 {
+  execsql {
+    PRAGMA aux.journal_mode = delete;
+  }
+  list [catch { sqlite3_snapshot_recover db aux } msg] $msg
+} {1 SQLITE_ERROR}
+
+finish_test