static void
DiscardAll(bool isTopLevel)
{
/*
* Disallow DISCARD ALL in a transaction block. This is arguably
* inconsistent (we don't make a similar check in the command sequence
* that DISCARD ALL is equivalent to), but the idea is to catch mistakes:
* DISCARD ALL inside a transaction block would leave the transaction
* still uncommitted.
*/
PreventTransactionChain(isTopLevel, "DISCARD ALL");
SetPGVariable("session_authorization", NIL, false);
ResetAllOptions();
DropAllPreparedStatements();
PortalHashTableDeleteAll();
Async_UnlistenAll();
LockReleaseAll(USER_LOCKMETHOD, true);
ResetPlanCache();
ResetTempTableNamespace();
}
/*
* PerformPortalClose
* Close a cursor.
*/
void
PerformPortalClose(const char *name)
{
Portal portal;
/* NULL means CLOSE ALL */
if (name == NULL)
{
PortalHashTableDeleteAll();
return;
}
/*
* Disallow empty-string cursor name (conflicts with protocol-level
* unnamed portal).
*/
if (name[0] == '\0')
ereport(ERROR,
(errcode(ERRCODE_INVALID_CURSOR_NAME),
errmsg("invalid cursor name: must not be empty")));
/*
* get the portal from the portal name
*/
portal = GetPortalByName(name);
if (!PortalIsValid(portal))
{
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_CURSOR),
errmsg("cursor \"%s\" does not exist", name)));
return; /* keep compiler happy */
}
/*
* Note: PortalCleanup is called as a side-effect
*/
PortalDrop(portal, false);
}
