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cac7658205
This provides a mechanism for specifying conversions between SQL data types and procedural languages. As examples, there are transforms for hstore and ltree for PL/Perl and PL/Python. reviews by Pavel Stěhule and Andres Freund
91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
#include "postgres.h"
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#undef _
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#include "fmgr.h"
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#include "plperl.h"
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#include "plperl_helpers.h"
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#include "hstore.h"
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(hstore_to_plperl);
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Datum hstore_to_plperl(PG_FUNCTION_ARGS);
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Datum
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hstore_to_plperl(PG_FUNCTION_ARGS)
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{
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HStore *in = PG_GETARG_HS(0);
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int i;
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int count = HS_COUNT(in);
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char *base = STRPTR(in);
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HEntry *entries = ARRPTR(in);
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HV *hv;
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hv = newHV();
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for (i = 0; i < count; i++)
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{
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const char *key;
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SV *value;
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key = pnstrdup(HS_KEY(entries, base, i), HS_KEYLEN(entries, i));
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value = HS_VALISNULL(entries, i) ? newSV(0) : cstr2sv(pnstrdup(HS_VAL(entries, base,i), HS_VALLEN(entries, i)));
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(void) hv_store(hv, key, strlen(key), value, 0);
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}
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return PointerGetDatum(newRV((SV *) hv));
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}
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PG_FUNCTION_INFO_V1(plperl_to_hstore);
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Datum plperl_to_hstore(PG_FUNCTION_ARGS);
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Datum
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plperl_to_hstore(PG_FUNCTION_ARGS)
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{
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HV *hv;
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HE *he;
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int32 buflen;
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int32 i;
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int32 pcount;
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HStore *out;
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Pairs *pairs;
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hv = (HV *) SvRV((SV *) PG_GETARG_POINTER(0));
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pcount = hv_iterinit(hv);
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pairs = palloc(pcount * sizeof(Pairs));
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i = 0;
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while ((he = hv_iternext(hv)))
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{
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char *key = sv2cstr(HeSVKEY_force(he));
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SV *value = HeVAL(he);
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pairs[i].key = pstrdup(key);
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pairs[i].keylen = hstoreCheckKeyLen(strlen(pairs[i].key));
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pairs[i].needfree = true;
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if (!SvOK(value))
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{
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pairs[i].val = NULL;
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pairs[i].vallen = 0;
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pairs[i].isnull = true;
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}
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else
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{
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pairs[i].val = pstrdup(sv2cstr(value));
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pairs[i].vallen = hstoreCheckValLen(strlen(pairs[i].val));
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pairs[i].isnull = false;
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}
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i++;
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}
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pcount = hstoreUniquePairs(pairs, pcount, &buflen);
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out = hstorePairs(pairs, pcount, buflen);
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PG_RETURN_POINTER(out);
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}
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