77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* params.c
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* Support for finding the values associated with Param nodes.
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*
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*
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* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/backend/nodes/params.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "nodes/params.h"
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#include "utils/datum.h"
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#include "utils/lsyscache.h"
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/*
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* Copy a ParamListInfo structure.
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*
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* The result is allocated in CurrentMemoryContext.
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*
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* Note: the intent of this function is to make a static, self-contained
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* set of parameter values. If dynamic parameter hooks are present, we
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* intentionally do not copy them into the result. Rather, we forcibly
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* instantiate all available parameter values and copy the datum values.
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*/
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ParamListInfo
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copyParamList(ParamListInfo from)
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{
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ParamListInfo retval;
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Size size;
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int i;
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if (from == NULL || from->numParams <= 0)
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return NULL;
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/* sizeof(ParamListInfoData) includes the first array element */
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size = sizeof(ParamListInfoData) +
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(from->numParams - 1) * sizeof(ParamExternData);
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retval = (ParamListInfo) palloc(size);
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retval->paramFetch = NULL;
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retval->paramFetchArg = NULL;
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retval->parserSetup = NULL;
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retval->parserSetupArg = NULL;
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retval->numParams = from->numParams;
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for (i = 0; i < from->numParams; i++)
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{
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ParamExternData *oprm = &from->params[i];
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ParamExternData *nprm = &retval->params[i];
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int16 typLen;
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bool typByVal;
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/* give hook a chance in case parameter is dynamic */
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if (!OidIsValid(oprm->ptype) && from->paramFetch != NULL)
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(*from->paramFetch) (from, i + 1);
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/* flat-copy the parameter info */
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*nprm = *oprm;
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/* need datumCopy in case it's a pass-by-reference datatype */
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if (nprm->isnull || !OidIsValid(nprm->ptype))
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continue;
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get_typlenbyval(nprm->ptype, &typLen, &typByVal);
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nprm->value = datumCopy(nprm->value, typByVal, typLen);
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}
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return retval;
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}
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