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Read-only transactions, as defined in SQL.

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This commit is contained in:
Peter Eisentraut
2003-01-10 22:03:30 +00:00
parent b7ca9bdf18
commit b65cd56240
16 changed files with 427 additions and 146 deletions
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125
src/backend/tcop/utility.c
View File

@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.188 2003/01/06 00:31:44 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.189 2003/01/10 22:03:28 petere Exp $
*
*-------------------------------------------------------------------------
*/
@@ -168,6 +168,66 @@ CheckOwnership(RangeVar *rel, bool noCatalogs)
}
static void
check_xact_readonly(Node *parsetree)
{
if (!XactReadOnly)
return;
/*
* Note: Commands that need to do more complicated checking are
* handled elsewhere.
*/
switch (nodeTag(parsetree))
{
case T_AlterDatabaseSetStmt:
case T_AlterDomainStmt:
case T_AlterGroupStmt:
case T_AlterTableStmt:
case T_RenameStmt:
case T_AlterUserStmt:
case T_AlterUserSetStmt:
case T_CommentStmt:
case T_DefineStmt:
case T_CreateCastStmt:
case T_CreateConversionStmt:
case T_CreatedbStmt:
case T_CreateDomainStmt:
case T_CreateFunctionStmt:
case T_CreateGroupStmt:
case T_IndexStmt:
case T_CreatePLangStmt:
case T_CreateOpClassStmt:
case T_RuleStmt:
case T_CreateSchemaStmt:
case T_CreateSeqStmt:
case T_CreateStmt:
case T_CreateTrigStmt:
case T_CompositeTypeStmt:
case T_CreateUserStmt:
case T_ViewStmt:
case T_RemoveAggrStmt:
case T_DropCastStmt:
case T_DropStmt:
case T_DropdbStmt:
case T_RemoveFuncStmt:
case T_DropGroupStmt:
case T_DropPLangStmt:
case T_RemoveOperStmt:
case T_RemoveOpClassStmt:
case T_DropPropertyStmt:
case T_DropUserStmt:
case T_GrantStmt:
case T_TruncateStmt:
elog(ERROR, "transaction is read-only");
break;
default:
/*nothing*/;
}
}
/*
* ProcessUtility
* general utility function invoker
@@ -187,6 +247,8 @@ ProcessUtility(Node *parsetree,
CommandDest dest,
char *completionTag)
{
check_xact_readonly(parsetree);
if (completionTag)
completionTag[0] = '\0';
@@ -214,16 +276,21 @@ ProcessUtility(Node *parsetree,
{
BeginTransactionBlock();
/*
* Currently, the only option that can be set
* by START TRANSACTION is the isolation
* level.
*/
if (stmt->options)
{
SetPGVariable("TRANSACTION ISOLATION LEVEL",
stmt->options,
false);
List *head;
foreach(head, stmt->options)
{
DefElem *item = (DefElem *) lfirst(head);
if (strcmp(item->defname, "transaction_isolation")==0)
SetPGVariable("transaction_isolation",
makeList1(item->arg), false);
else if (strcmp(item->defname, "transaction_read_only")==0)
SetPGVariable("transaction_read_only",
makeList1(item->arg), false);
}
}
}
break;
@@ -765,7 +832,45 @@ ProcessUtility(Node *parsetree,
{
VariableSetStmt *n = (VariableSetStmt *) parsetree;
SetPGVariable(n->name, n->args, n->is_local);
/*
* Special cases for special SQL syntax that
* effectively sets more than one variable per
* statement.
*/
if (strcmp(n->name, "TRANSACTION")==0)
{
List *head;
foreach(head, n->args)
{
DefElem *item = (DefElem *) lfirst(head);
if (strcmp(item->defname, "transaction_isolation")==0)
SetPGVariable("transaction_isolation",
makeList1(item->arg), n->is_local);
else if (strcmp(item->defname, "transaction_read_only")==0)
SetPGVariable("transaction_read_only",
makeList1(item->arg), n->is_local);
}
}
else if (strcmp(n->name, "SESSION CHARACTERISTICS")==0)
{
List *head;
foreach(head, n->args)
{
DefElem *item = (DefElem *) lfirst(head);
if (strcmp(item->defname, "transaction_isolation")==0)
SetPGVariable("default_transaction_isolation",
makeList1(item->arg), n->is_local);
else if (strcmp(item->defname, "transaction_read_only")==0)
SetPGVariable("default_transaction_read_only",
makeList1(item->arg), n->is_local);
}
}
else
SetPGVariable(n->name, n->args, n->is_local);
}
break;