Scoped recovery module for sql/

sql/connection.h

Index: sql/connection.h
diff --git a/sql/connection.h b/sql/connection.h
index a2e8f67f944bd8cde89a05f4345136a855d26944..4f84e36f295994cabdcb0760c386e7b5fcb5d07c 100644
--- a/sql/connection.h
+++ b/sql/connection.h
@@ -28,6 +28,7 @@ class FilePath;
 
 namespace sql {
 
+class Recovery;
 class Statement;
 
 // Uniquely identifies a statement. There are two modes of operation:
@@ -157,6 +158,12 @@ class SQL_EXPORT Connection {
   // empty. You can call this or Open.
   bool OpenInMemory() WARN_UNUSED_RESULT;
 
+  // Create a temporary on-disk database.  The database will be
+  // deleted after close.  This kind of database is similar to
+  // OpenInMemory() for small databases, but can page to disk if the
+  // database becomes large.
+  bool OpenTemporary() WARN_UNUSED_RESULT;
+
   // Returns true if the database has been successfully opened.
   bool is_open() const { return !!db_; }
 
@@ -224,6 +231,9 @@ class SQL_EXPORT Connection {
   // cases.
   bool RazeAndClose();
 
+  // Like RazeAndClose(), but without the Raze().
+  void CloseAndPoison();
+
   // Delete the underlying database files associated with |path|.
   // This should be used on a database which has no existing
   // connections.  If any other connections are open to the same
@@ -251,6 +261,10 @@ class SQL_EXPORT Connection {
   void RollbackTransaction();
   bool CommitTransaction();
 
+  // Rollback all outstanding transactions.  Use with care, there may
+  // be scoped transactions on the stack.
+  void RollbackAllTransactions();
+
   // Returns the current transaction nesting, which will be 0 if there are
   // no open transactions.
   int transaction_nesting() const { return transaction_nesting_; }
@@ -347,6 +361,9 @@ class SQL_EXPORT Connection {
   const char* GetErrorMessage() const;
 
  private:
+  // For recovery module.
+  friend class Recovery;
+
   // Allow test-support code to set/reset error ignorer.
   friend class ScopedErrorIgnorer;