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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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19
src/backend/parser/gram.y
View File

@ -312,6 +312,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
%type <boolean> opt_or_replace
opt_grant_grant_option opt_grant_admin_option
opt_nowait opt_if_exists opt_with_data
opt_transaction_chain
%type <ival> opt_nowait_or_skip
%type <list> OptRoleList AlterOptRoleList
@ -9792,11 +9793,12 @@ UnlistenStmt:
*****************************************************************************/
TransactionStmt:
ABORT_P opt_transaction
ABORT_P opt_transaction opt_transaction_chain
{
TransactionStmt *n = makeNode(TransactionStmt);
n->kind = TRANS_STMT_ROLLBACK;
n->options = NIL;
n->chain = $3;
$$ = (Node *)n;
}
| BEGIN_P opt_transaction transaction_mode_list_or_empty
@ -9813,25 +9815,28 @@ TransactionStmt:
n->options = $3;
$$ = (Node *)n;
}
| COMMIT opt_transaction
| COMMIT opt_transaction opt_transaction_chain
{
TransactionStmt *n = makeNode(TransactionStmt);
n->kind = TRANS_STMT_COMMIT;
n->options = NIL;
n->chain = $3;
$$ = (Node *)n;
}
| END_P opt_transaction
| END_P opt_transaction opt_transaction_chain
{
TransactionStmt *n = makeNode(TransactionStmt);
n->kind = TRANS_STMT_COMMIT;
n->options = NIL;
n->chain = $3;
$$ = (Node *)n;
}
| ROLLBACK opt_transaction
| ROLLBACK opt_transaction opt_transaction_chain
{
TransactionStmt *n = makeNode(TransactionStmt);
n->kind = TRANS_STMT_ROLLBACK;
n->options = NIL;
n->chain = $3;
$$ = (Node *)n;
}
| SAVEPOINT ColId
@ -9931,6 +9936,12 @@ transaction_mode_list_or_empty:
{ $$ = NIL; }
;
opt_transaction_chain:
AND CHAIN { $$ = true; }
| AND NO CHAIN { $$ = false; }
| /* EMPTY */ { $$ = false; }
;
/*****************************************************************************
*