mirror of https://github.com/postgres/postgres
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
2.6 KiB
123 lines
2.6 KiB
21 years ago
|
/*-------------------------------------------------------------------------
|
||
|
|
*
|
||
|
|
* params.c
|
||
|
|
* Support functions for plan parameter lists.
|
||
|
|
*
|
||
|
|
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
|
||
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
||
|
|
*
|
||
|
|
* IDENTIFICATION
|
||
|
|
* $PostgreSQL: pgsql/src/backend/nodes/params.c,v 1.1 2004/08/02 01:30:42 tgl Exp $
|
||
|
|
*
|
||
|
|
*-------------------------------------------------------------------------
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "postgres.h"
|
||
|
|
|
||
|
|
#include "nodes/params.h"
|
||
|
|
#include "utils/datum.h"
|
||
|
|
#include "utils/lsyscache.h"
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copy a ParamList.
|
||
|
|
*
|
||
|
|
* The result is allocated in CurrentMemoryContext.
|
||
|
|
*/
|
||
|
|
ParamListInfo
|
||
|
|
copyParamList(ParamListInfo from)
|
||
|
|
{
|
||
|
|
ParamListInfo retval;
|
||
|
|
int i, size;
|
||
|
|
|
||
|
|
if (from == NULL)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
size = 0;
|
||
|
|
while (from[size].kind != PARAM_INVALID)
|
||
|
|
size++;
|
||
|
|
|
||
|
|
retval = (ParamListInfo) palloc0((size + 1) * sizeof(ParamListInfoData));
|
||
|
|
|
||
|
|
for (i = 0; i < size; i++) {
|
||
|
|
/* copy metadata */
|
||
|
|
retval[i].kind = from[i].kind;
|
||
|
|
if (from[i].kind == PARAM_NAMED)
|
||
|
|
retval[i].name = pstrdup(from[i].name);
|
||
|
|
retval[i].id = from[i].id;
|
||
|
|
retval[i].ptype = from[i].ptype;
|
||
|
|
|
||
|
|
/* copy value */
|
||
|
|
retval[i].isnull = from[i].isnull;
|
||
|
|
if (from[i].isnull)
|
||
|
|
{
|
||
|
|
retval[i].value = from[i].value; /* nulls just copy */
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
int16 typLen;
|
||
|
|
bool typByVal;
|
||
|
|
|
||
|
|
get_typlenbyval(from[i].ptype, &typLen, &typByVal);
|
||
|
|
retval[i].value = datumCopy(from[i].value, typByVal, typLen);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
retval[size].kind = PARAM_INVALID;
|
||
|
|
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Search a ParamList for a given parameter.
|
||
|
|
*
|
||
|
|
* On success, returns a pointer to the parameter's entry.
|
||
|
|
* On failure, returns NULL if noError is true, else ereports the error.
|
||
|
|
*/
|
||
|
|
ParamListInfo
|
||
|
|
lookupParam(ParamListInfo paramList, int thisParamKind,
|
||
|
|
const char *thisParamName, AttrNumber thisParamId,
|
||
|
|
bool noError)
|
||
|
|
{
|
||
|
|
if (paramList != NULL)
|
||
|
|
{
|
||
|
|
while (paramList->kind != PARAM_INVALID)
|
||
|
|
{
|
||
|
|
if (thisParamKind == paramList->kind)
|
||
|
|
{
|
||
|
|
switch (thisParamKind)
|
||
|
|
{
|
||
|
|
case PARAM_NAMED:
|
||
|
|
if (strcmp(paramList->name, thisParamName) == 0)
|
||
|
|
return paramList;
|
||
|
|
break;
|
||
|
|
case PARAM_NUM:
|
||
|
|
if (paramList->id == thisParamId)
|
||
|
|
return paramList;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
elog(ERROR, "unrecognized paramkind: %d",
|
||
|
|
thisParamKind);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
paramList++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!noError)
|
||
|
|
{
|
||
|
|
if (thisParamKind == PARAM_NAMED)
|
||
|
|
ereport(ERROR,
|
||
|
|
(errcode(ERRCODE_UNDEFINED_OBJECT),
|
||
|
|
errmsg("no value found for parameter \"%s\"",
|
||
|
|
thisParamName)));
|
||
|
|
else
|
||
|
|
ereport(ERROR,
|
||
|
|
(errcode(ERRCODE_UNDEFINED_OBJECT),
|
||
|
|
errmsg("no value found for parameter %d",
|
||
|
|
thisParamId)));
|
||
|
|
}
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|