non-standard clauses. Allow CHARACTERISTICS as unquoted identifier.
Merge related reference pages.
+++ /dev/null
-
-
-
-
- SET
- SQL - Language Statements
-
-
- SET SESSION CHARACTERISTICS
- Set per-session run-time parameters
-
-
-
-SET SESSION CHARACTERISTICS TRANSACTION ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE }
-SET SESSION CHARACTERISTICS TIME ZONE { 'timezone' | LOCAL | DEFAULT }
-
-
-
-
-
Description
- SET SESSION CHARACTERISTICS changes the run-time
- environment for the entire
SQL- session. Currently, transaction isolation level and time zone can
- be specified by this command.
-
-
- Use to show the
- current setting of a parameters.
-
-
- Refer to
- and to for more
- information on allowed parameters.
-
-
-
-
-
Examples
-
- Set the timezone for Berkeley, California, using double quotes to
- preserve the uppercase attributes of the time zone specifier (note
- that the date/time format is ISO here):
-
-
-SET SESSION CHARACTERISTICS TIME ZONE "PST8PDT";
-SELECT CURRENT_TIMESTAMP AS today;
-
- today
-------------------------
- 1998-07-14 07:41:21-07
-
-
-
-
-
-
Compatibility
-
-
-
SQL99
-
- SET SESSION is defined in
-
-
-
-
-
-
-
+
+
+ 2000-11-24
+
+
SET TRANSACTION
SQL - Language Statements
+
SET TRANSACTION
Set the characteristics of the current SQL-transaction
+
-
- 2000-06-01
-
SET TRANSACTION ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE }
+SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE }
Description
- The SET TRANSACTION command sets the
- characteristics for the current SQL-transaction. It has no effect
- on any subsequent transactions. This command cannot be used after
- the first DML statement (SELECT,
- INSERT, DELETE,
- UPDATE, FETCH,
- COPY) of a transaction has been executed.
+ This command sets the transaction isolation level. The
+ SET TRANSACTION command sets the characteristics
+ for the current SQL-transaction. It has no effect on any subsequent
+ transactions. This command cannot be used after the first DML
+ statement (SELECT, INSERT,
+ DELETE, UPDATE,
+ FETCH, COPY) of a transaction
+ has been executed. SET SESSION CHARACTERISTICS
+ sets the default transaction isolation level for each transaction
+ for a session. SET TRANSACTION can override it
+ for an individual transaction.
In
SQL there are two other transaction
- characteristics that can be set with this command: whether the
+ characteristics that can be set with these commands: whether the
transaction is read-only and the size of the diagnostics area.
Neither of these concepts are supported in Postgres.
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.132 2000/11/14 18:37:42 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.133 2000/11/24 20:16:39 petere Exp $
*
*-------------------------------------------------------------------------
*/
return newnode;
}
-static SetSessionStmt *
-_copySetSessionStmt(SetSessionStmt *from)
-{
- SetSessionStmt *newnode = makeNode(SetSessionStmt);
-
- Node_Copy(from, newnode, args);
-
- return newnode;
-}
-
/* ****************************************************************
* pg_list.h copy functions
case T_ReindexStmt:
retval = _copyReindexStmt(from);
break;
- case T_SetSessionStmt:
- retval = _copySetSessionStmt(from);
- break;
case T_CheckPointStmt:
retval = (void*)makeNode(CheckPointStmt);
break;
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.82 2000/11/14 18:37:42 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.83 2000/11/24 20:16:39 petere Exp $
*
*-------------------------------------------------------------------------
*/
return true;
}
-static bool
-_equalSetSessionStmt(SetSessionStmt *a, SetSessionStmt *b)
-{
- if (!equal(a->args, b->args))
- return false;
-
- return true;
-}
-
static bool
_equalAExpr(A_Expr *a, A_Expr *b)
{
case T_ReindexStmt:
retval = _equalReindexStmt(a, b);
break;
- case T_SetSessionStmt:
- retval = _equalSetSessionStmt(a, b);
- break;
case T_CheckPointStmt:
retval = true;
break;
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: analyze.c,v 1.167 2000/11/18 16:17:20 petere Exp $
+ * $Id: analyze.c,v 1.168 2000/11/24 20:16:39 petere Exp $
*
*-------------------------------------------------------------------------
*/
result = transformAlterTableStmt(pstate, (AlterTableStmt *) parseTree);
break;
- case T_SetSessionStmt:
- {
- List *l;
- /* Session is a list of SetVariable nodes
- * so just run through the list.
- */
- SetSessionStmt *stmt = (SetSessionStmt *) parseTree;
-
- l = stmt->args;
- /* First check for duplicate keywords (disallowed by SQL99) */
- while (l != NULL)
- {
- VariableSetStmt *v = (VariableSetStmt *) lfirst(l);
- List *ll = lnext(l);
- while (ll != NULL)
- {
- VariableSetStmt *vv = (VariableSetStmt *) lfirst(ll);
- if (strcmp(v->name, vv->name) == 0)
- elog(ERROR, "SET SESSION CHARACTERISTICS duplicated entry not allowed");
- ll = lnext(ll);
- }
- l = lnext(l);
- }
-
- l = stmt->args;
- result = transformStmt(pstate, lfirst(l));
- l = lnext(l);
- if (l != NULL)
- extras_after = lappend(extras_after, lfirst(l));
- }
- break;
-
/*------------------------
* Optimizable statements
*------------------------
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.209 2000/11/14 18:37:49 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.210 2000/11/24 20:16:39 petere Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
NotifyStmt, OptimizableStmt, ProcedureStmt, ReindexStmt,
RemoveAggrStmt, RemoveFuncStmt, RemoveOperStmt,
RenameStmt, RevokeStmt, RuleActionStmt, RuleActionStmtOrEmpty,
- RuleStmt, SelectStmt, SetSessionStmt, TransactionStmt, TruncateStmt,
+ RuleStmt, SelectStmt, TransactionStmt, TruncateStmt,
UnlistenStmt, UpdateStmt, VacuumStmt, VariableResetStmt,
VariableSetStmt, VariableShowStmt, ViewStmt, CheckPointStmt
%type select_no_parens, select_clause, simple_select
-%type SessionList
-%type SessionClause
-
%type alter_column_action
%type drop_behavior
| RevokeStmt
| OptimizableStmt
| RuleStmt
- | SetSessionStmt
| TransactionStmt
| ViewStmt
| LoadStmt
}
-/*****************************************************************************
- *
- * Manipulate a postgresql session
- *
- *
- *****************************************************************************/
-
-SetSessionStmt: SET SESSION CHARACTERISTICS AS SessionList
- {
- SetSessionStmt *n = makeNode(SetSessionStmt);
- n->args = $5;
- $$ = (Node*)n;
- }
- ;
-
-SessionList: SessionList ',' SessionClause
- {
- $$ = lappend($1, $3);
- }
- | SessionClause
- {
- $$ = makeList1($1);
- }
- ;
-
-SessionClause: TRANSACTION COMMIT opt_boolean
- {
- VariableSetStmt *n = makeNode(VariableSetStmt);
- n->name = "autocommit";
- n->value = $3;
- $$ = (Node *) n;
- }
- | TIME ZONE zone_value
- {
- VariableSetStmt *n = makeNode(VariableSetStmt);
- n->name = "timezone";
- n->value = $3;
- $$ = (Node *) n;
- }
- | TRANSACTION ISOLATION LEVEL opt_level
- {
- VariableSetStmt *n = makeNode(VariableSetStmt);
- n->name = "DefaultXactIsoLevel";
- n->value = $4;
- $$ = (Node *) n;
- }
- ;
-
-
/*****************************************************************************
*
* Set PG internal variable
n->value = $5;
$$ = (Node *) n;
}
+ | SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL opt_level
+ {
+ VariableSetStmt *n = makeNode(VariableSetStmt);
+ n->name = "DefaultXactIsoLevel";
+ n->value = $8;
+ $$ = (Node *) n;
+ }
| SET NAMES opt_encoding
{
VariableSetStmt *n = makeNode(VariableSetStmt);
| CACHE { $$ = "cache"; }
| CASCADE { $$ = "cascade"; }
| CHAIN { $$ = "chain"; }
+ | CHARACTERISTICS { $$ = "characteristics"; }
| CHECKPOINT { $$ = "checkpoint"; }
| CLOSE { $$ = "close"; }
| COMMENT { $$ = "comment"; }
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: nodes.h,v 1.83 2000/11/12 00:37:01 tgl Exp $
+ * $Id: nodes.h,v 1.84 2000/11/24 20:16:40 petere Exp $
*
*-------------------------------------------------------------------------
*/
T_AlterGroupStmt,
T_DropGroupStmt,
T_ReindexStmt,
- T_SetSessionStmt,
T_CheckPointStmt,
T_A_Expr = 700,
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: parsenodes.h,v 1.121 2000/11/14 18:37:48 tgl Exp $
+ * $Id: parsenodes.h,v 1.122 2000/11/24 20:16:40 petere Exp $
*
*-------------------------------------------------------------------------
*/
} ExplainStmt;
/* ----------------------
- * Set Session Statement
+ * Checkpoint Statement
* ----------------------
*/
-typedef struct SetSessionStmt
-{
- NodeTag type;
- List *args;
-} SetSessionStmt;
-
typedef struct CheckPointStmt
{
NodeTag type;
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