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Transaction chaining

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Add command variants COMMIT AND CHAIN and ROLLBACK AND CHAIN, which
start new transactions with the same transaction characteristics as the
just finished one, per SQL standard.

Support for transaction chaining in PL/pgSQL is also added.  This
functionality is especially useful when running COMMIT in a loop in
PL/pgSQL.

Reviewed-by: Fabien COELHO <coelho@cri.ensmp.fr>
Discussion: https://www.postgresql.org/message-id/flat/28536681-324b-10dc-ade8-ab46f7645a5a@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2019-03-24 10:33:14 +01:00
parent b2db277057
commit 280a408b48
26 changed files with 601 additions and 38 deletions
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6
src/include/access/xact.h
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@ -368,12 +368,14 @@ extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
extern void CommandCounterIncrement(void);
extern void ForceSyncCommit(void);
extern void StartTransactionCommand(void);
extern void SaveTransactionCharacteristics(void);
extern void RestoreTransactionCharacteristics(void);
extern void CommitTransactionCommand(void);
extern void AbortCurrentTransaction(void);
extern void BeginTransactionBlock(void);
extern bool EndTransactionBlock(void);
extern bool EndTransactionBlock(bool chain);
extern bool PrepareTransactionBlock(const char *gid);
extern void UserAbortTransactionBlock(void);
extern void UserAbortTransactionBlock(bool chain);
extern void BeginImplicitTransactionBlock(void);
extern void EndImplicitTransactionBlock(void);
extern void ReleaseSavepoint(const char *name);