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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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50
src/backend/executor/spi.c
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@ -217,8 +217,8 @@ SPI_start_transaction(void)
MemoryContextSwitchTo(oldcontext);
}
void
SPI_commit(void)
static void
_SPI_commit(bool chain)
{
MemoryContext oldcontext = CurrentMemoryContext;
@ -250,14 +250,36 @@ SPI_commit(void)
while (ActiveSnapshotSet())
PopActiveSnapshot();
if (chain)
SaveTransactionCharacteristics();
CommitTransactionCommand();
if (chain)
{
StartTransactionCommand();
RestoreTransactionCharacteristics();
}
MemoryContextSwitchTo(oldcontext);
_SPI_current->internal_xact = false;
}
void
SPI_rollback(void)
SPI_commit(void)
{
_SPI_commit(false);
}
void
SPI_commit_and_chain(void)
{
_SPI_commit(true);
}
static void
_SPI_rollback(bool chain)
{
MemoryContext oldcontext = CurrentMemoryContext;
@ -274,12 +296,34 @@ SPI_rollback(void)
_SPI_current->internal_xact = true;
if (chain)
SaveTransactionCharacteristics();
AbortCurrentTransaction();
if (chain)
{
StartTransactionCommand();
RestoreTransactionCharacteristics();
}
MemoryContextSwitchTo(oldcontext);
_SPI_current->internal_xact = false;
}
void
SPI_rollback(void)
{
_SPI_rollback(false);
}
void
SPI_rollback_and_chain(void)
{
_SPI_rollback(true);
}
/*
* Clean up SPI state. Called on transaction end (of non-SPI-internal
* transactions) and when returning to the main loop on error.