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The attached patch implements START TRANSACTION, per SQL99. The

Browse source 
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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3
doc/src/sgml/ref/allfiles.sgml
View file

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.43 2002/07/29 22:14:10 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/allfiles.sgml,v 1.44 2002/08/04 04:31:44 momjian Exp $
PostgreSQL documentation
Complete list of usable sgml source files in this directory.
-->
@ -113,6 +113,7 @@ Complete list of usable sgml source files in this directory.
<!entity setSessionAuth system "set_session_auth.sgml">
<!entity setTransaction system "set_transaction.sgml">
<!entity show system "show.sgml">
<!entity startTransaction system "start_transaction.sgml">
<!entity truncate system "truncate.sgml">
<!entity unlisten system "unlisten.sgml">
<!entity update system "update.sgml">

2
doc/src/sgml/ref/begin.sgml
View file

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/begin.sgml,v 1.17 2002/04/21 19:02:39 thomas Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/begin.sgml,v 1.18 2002/08/04 04:31:44 momjian Exp $
PostgreSQL documentation
-->

12
doc/src/sgml/ref/set_transaction.sgml
View file

@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_transaction.sgml,v 1.8 2002/01/20 22:19:57 petere Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_transaction.sgml,v 1.9 2002/08/04 04:31:44 momjian Exp $ -->
<refentry id="SQL-SET-TRANSACTION">
<docinfo>
<date>2000-11-24</date>
@ -97,11 +97,11 @@ SET default_transaction_isolation = '<replaceable>value</replaceable>'
<title>SQL92, SQL99</title>
<para>
SERIALIZABLE is the default level in <acronym>SQL</acronym>.
<productname>PostgreSQL</productname> does not provide the
isolation levels <option>READ UNCOMMITTED</option>
and <option>REPEATABLE READ</option>. Because
of multiversion concurrency control, the serializable level is not
<option>SERIALIZABLE</option> is the default level in
<acronym>SQL</acronym>. <productname>PostgreSQL</productname> does
not provide the isolation levels <option>READ UNCOMMITTED</option>
and <option>REPEATABLE READ</option>. Because of multiversion
concurrency control, the <option>SERIALIZABLE</option> level is not
truly serializable. See the <citetitle>User's Guide</citetitle> for
details.
</para>

3
doc/src/sgml/reference.sgml
View file

@ -1,5 +1,5 @@
<!-- reference.sgml
$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.32 2002/07/29 22:14:10 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/reference.sgml,v 1.33 2002/08/04 04:31:44 momjian Exp $
PostgreSQL Reference Manual
-->
@ -122,6 +122,7 @@ PostgreSQL Reference Manual
&setSessionAuth;
&setTransaction;
&show;
&startTransaction;
&truncate;
&unlisten;
&update;

3
src/backend/nodes/copyfuncs.c
View file

@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.198 2002/07/29 22:14:10 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.199 2002/08/04 04:31:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -2226,6 +2226,7 @@ _copyTransactionStmt(TransactionStmt *from)
TransactionStmt *newnode = makeNode(TransactionStmt);
newnode->command = from->command;
Node_Copy(from, newnode, options);
return newnode;
}

4
src/backend/nodes/equalfuncs.c
View file

@ -20,7 +20,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.145 2002/07/29 22:14:10 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.146 2002/08/04 04:31:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -1055,6 +1055,8 @@ _equalTransactionStmt(TransactionStmt *a, TransactionStmt *b)
{
if (a->command != b->command)
return false;
if (!equal(a->options, b->options))
return false;
return true;
}

55
src/backend/parser/gram.y
View file

@ -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"; }
;
@ -3445,44 +3445,49 @@ 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;
n->options = NIL;
$$ = (Node *)n;
}
| ROLLBACK opt_trans opt_chain
{
TransactionStmt *n = makeNode(TransactionStmt);
n->command = ROLLBACK;
$$ = (Node *)n;
}
;
trans_options: ISOLATION LEVEL iso_level
{ $$ = makeList1(makeStringConst($3, NULL)); }
| /* EMPTY */ { $$ = NIL; }
;
opt_trans: WORK {}
@ -3490,22 +3495,10 @@ opt_trans: WORK {}
| /*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>
*
*****************************************************************************/

8
src/backend/tcop/postgres.c
View file

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.276 2002/07/30 16:55:45 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.277 2002/08/04 04:31:44 momjian Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -1693,7 +1693,7 @@ PostgresMain(int argc, char *argv[], const char *username)
if (!IsUnderPostmaster)
{
puts("\nPOSTGRES backend interactive interface ");
puts("$Revision: 1.276 $ $Date: 2002/07/30 16:55:45 $\n");
puts("$Revision: 1.277 $ $Date: 2002/08/04 04:31:44 $\n");
}
/*
@ -2160,6 +2160,10 @@ CreateCommandTag(Node *parsetree)
tag = "BEGIN";
break;
case START:
tag = "START TRANSACTION";
break;
case COMMIT:
tag = "COMMIT";
break;

24
src/backend/tcop/utility.c
View file

@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.167 2002/07/30 16:55:45 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.168 2002/08/04 04:31:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -205,6 +205,28 @@ ProcessUtility(Node *parsetree,
BeginTransactionBlock();
break;
/*
* START TRANSACTION, as defined by SQL99: Identical to BEGIN,
* except that it takes a few additional options.
*/
case START:
{
BeginTransactionBlock();
/*
* Currently, the only option that can be set is
* the transaction isolation level by START
* TRANSACTION.
*/
if (stmt->options)
{
SetPGVariable("TRANSACTION ISOLATION LEVEL",
stmt->options,
false);
}
}
break;
case COMMIT:
EndTransactionBlock();
break;

7
src/include/nodes/parsenodes.h
View file

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: parsenodes.h,v 1.196 2002/07/30 16:55:45 momjian Exp $
* $Id: parsenodes.h,v 1.197 2002/08/04 04:31:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -1387,13 +1387,14 @@ typedef struct UnlistenStmt
} UnlistenStmt;
/* ----------------------
* {Begin|Abort|End} Transaction Statement
* {Begin|Commit|Rollback} Transaction Statement
* ----------------------
*/
typedef struct TransactionStmt
{
NodeTag type;
int command; /* BEGIN|END|ABORT */
int command; /* BEGIN_TRANS|START|COMMIT|ROLLBACK */
List *options;
} TransactionStmt;
/* ----------------------