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The attached patch implements START TRANSACTION, per SQL99. The

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functionality of the command is basically identical to that of
BEGIN; it just accepts a few extra options (only one of which
PostgreSQL currently implements), and is standards-compliant.
The patch includes a simple regression test and documentation.

[ Regression tests removed, per Peter.]

Neil Conway
This commit is contained in:
Bruce Momjian
2002-08-04 04:31:44 +00:00
parent fecc04f95a
commit 19e0e35bcd
10 changed files with 74 additions and 49 deletions
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55
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.352 2002/07/31 17:19:51 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.353 2002/08/04 04:31:44 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -195,7 +195,7 @@ static void doNegateFloat(Value *v);
%type <str> opt_id, all_Op, MathOp, opt_name, SpecialRuleRelation
%type <str> opt_level, opt_encoding
%type <str> iso_level, opt_encoding
%type <node> grantee
%type <list> grantee_list
%type <ival> privilege
@@ -218,7 +218,7 @@ static void doNegateFloat(Value *v);
target_list, update_target_list, insert_column_list,
insert_target_list, def_list, opt_indirection,
group_clause, TriggerFuncArgs, select_limit,
opt_select_limit, opclass_item_list
opt_select_limit, opclass_item_list, trans_options
%type <range> into_clause, OptTempTableName
@@ -847,14 +847,14 @@ set_rest: ColId TO var_list_or_default
n->args = makeList1($3);
$$ = n;
}
| TRANSACTION ISOLATION LEVEL opt_level opt_mode
| TRANSACTION ISOLATION LEVEL iso_level opt_mode
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->name = "TRANSACTION ISOLATION LEVEL";
n->args = makeList1(makeStringConst($4, NULL));
$$ = n;
}
| SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL opt_level
| SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL iso_level
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->name = "default_transaction_isolation";
@@ -902,7 +902,7 @@ var_value: opt_boolean
{ $$ = makeAConst($1); }
;
opt_level: READ COMMITTED { $$ = "read committed"; }
iso_level: READ COMMITTED { $$ = "read committed"; }
| SERIALIZABLE { $$ = "serializable"; }
;
@@ -3445,67 +3445,60 @@ TransactionStmt:
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = ROLLBACK;
n->options = NIL;
$$ = (Node *)n;
}
| BEGIN_TRANS opt_trans
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = BEGIN_TRANS;
n->options = NIL;
$$ = (Node *)n;
}
| START TRANSACTION trans_options
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = START;
n->options = $3;
$$ = (Node *)n;
}
| COMMIT opt_trans
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = COMMIT;
$$ = (Node *)n;
}
| COMMIT opt_trans opt_chain
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = COMMIT;
n->options = NIL;
$$ = (Node *)n;
}
| END_TRANS opt_trans
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = COMMIT;
n->options = NIL;
$$ = (Node *)n;
}
| ROLLBACK opt_trans
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = ROLLBACK;
$$ = (Node *)n;
}
| ROLLBACK opt_trans opt_chain
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = ROLLBACK;
n->options = NIL;
$$ = (Node *)n;
}
;
trans_options: ISOLATION LEVEL iso_level
{ $$ = makeList1(makeStringConst($3, NULL)); }
| /* EMPTY */ { $$ = NIL; }
;
opt_trans: WORK {}
| TRANSACTION {}
| /*EMPTY*/ {}
;
opt_chain: AND NO CHAIN {}
| AND CHAIN
{
/* SQL99 asks that conforming dbs reject AND CHAIN
* if they don't support it. So we can't just ignore it.
* - thomas 2000-08-06
*/
elog(ERROR, "COMMIT/AND CHAIN not yet supported");
}
;
/*****************************************************************************
*
* QUERY:
* define view <viewname> '('target-list ')' [where <quals> ]
* create view <viewname> '('target-list ')' AS <query>
*
*****************************************************************************/