C++ PG_GETARG_HS函数代码示例

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本文整理汇总了C++中PG_GETARG_HS函数的典型用法代码示例。如果您正苦于以下问题：C++ PG_GETARG_HS函数的具体用法？C++ PG_GETARG_HS怎么用？C++ PG_GETARG_HS使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了PG_GETARG_HS函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: hstore_to_plpython

Datum
hstore_to_plpython(PG_FUNCTION_ARGS)
{
	HStore	   *in = PG_GETARG_HS(0);
	int			i;
	int			count = HS_COUNT(in);
	char	   *base = STRPTR(in);
	HEntry	   *entries = ARRPTR(in);
	PyObject   *dict;

	dict = PyDict_New();

	for (i = 0; i < count; i++)
	{
		PyObject   *key;

		key = PyString_FromStringAndSize(HSTORE_KEY(entries, base, i),
										 HSTORE_KEYLEN(entries, i));
		if (HSTORE_VALISNULL(entries, i))
			PyDict_SetItem(dict, key, Py_None);
		else
		{
			PyObject   *value;

			value = PyString_FromStringAndSize(HSTORE_VAL(entries, base, i),
											   HSTORE_VALLEN(entries, i));
			PyDict_SetItem(dict, key, value);
			Py_XDECREF(value);
		}
		Py_XDECREF(key);
	}

	return PointerGetDatum(dict);
}

开发者ID:BertrandAreal，项目名称:postgres，代码行数:34，代码来源:hstore_plpython.c

示例2: gin_extract_hstore

Datum
gin_extract_hstore(PG_FUNCTION_ARGS)
{
	HStore	   *hs = PG_GETARG_HS(0);
	int32	   *nentries = (int32 *) PG_GETARG_POINTER(1);
	Datum	   *entries = NULL;
	HEntry	   *hsent = ARRPTR(hs);
	char	   *ptr = STRPTR(hs);
	int			count = HS_COUNT(hs);
	int			i;

	*nentries = 2 * count;
	if (count)
		entries = (Datum *) palloc(sizeof(Datum) * 2 * count);

	for (i = 0; i < count; ++i)
	{
		text	   *item;

		item = makeitem(HS_KEY(hsent, ptr, i), HS_KEYLEN(hsent, i),
						KEYFLAG);
		entries[2 * i] = PointerGetDatum(item);

		if (HS_VALISNULL(hsent, i))
			item = makeitem(NULL, 0, NULLFLAG);
		else
			item = makeitem(HS_VAL(hsent, ptr, i), HS_VALLEN(hsent, i),
							VALFLAG);
		entries[2 * i + 1] = PointerGetDatum(item);
	}

	PG_RETURN_POINTER(entries);
}

开发者ID:BioBD，项目名称:Hypothetical_Indexes，代码行数:33，代码来源:hstore_gin.c

示例3: hstore_exists_all

Datum
hstore_exists_all(PG_FUNCTION_ARGS)
{
    HStore	   *hs = PG_GETARG_HS(0);
    ArrayType  *keys = PG_GETARG_ARRAYTYPE_P(1);
    int			nkeys;
    Pairs	   *key_pairs = hstoreArrayToPairs(keys, &nkeys);
    int			i;
    int			lowbound = 0;
    bool		res = true;

    /*
     * we exploit the fact that the pairs list is already sorted into strictly
     * increasing order to narrow the hstoreFindKey search; each search can
     * start one entry past the previous "found" entry, or at the lower bound
     * of the last search.
     */
    for (i = 0; i < nkeys; i++)
    {
        int			idx = hstoreFindKey(hs, &lowbound,
                                        key_pairs[i].key, key_pairs[i].keylen);

        if (idx < 0)
        {
            res = false;
            break;
        }
    }

    PG_RETURN_BOOL(res);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:31，代码来源:hstore_op.c

示例4: hstore_send

Datum
hstore_send(PG_FUNCTION_ARGS)
{
	HStore	   *in = PG_GETARG_HS(0);
	int			i;
	int			count = HS_COUNT(in);
	char	   *base = STRPTR(in);
	HEntry	   *entries = ARRPTR(in);
	StringInfoData buf;

	pq_begintypsend(&buf);

	pq_sendint(&buf, count, 4);

	for (i = 0; i < count; i++)
	{
		int32		keylen = HS_KEYLEN(entries, i);

		pq_sendint(&buf, keylen, 4);
		pq_sendtext(&buf, HS_KEY(entries, base, i), keylen);
		if (HS_VALISNULL(entries, i))
		{
			pq_sendint(&buf, -1, 4);
		}
		else
		{
			int32		vallen = HS_VALLEN(entries, i);

			pq_sendint(&buf, vallen, 4);
			pq_sendtext(&buf, HS_VAL(entries, base, i), vallen);
		}
	}

	PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}

开发者ID:d，项目名称:gpdb，代码行数:35，代码来源:hstore_io.c

示例5: hstore_slice_to_array

Datum
hstore_slice_to_array(PG_FUNCTION_ARGS)
{
    HStore	   *hs = PG_GETARG_HS(0);
    HEntry	   *entries = ARRPTR(hs);
    char	   *ptr = STRPTR(hs);
    ArrayType  *key_array = PG_GETARG_ARRAYTYPE_P(1);
    ArrayType  *aout;
    Datum	   *key_datums;
    bool	   *key_nulls;
    Datum	   *out_datums;
    bool	   *out_nulls;
    int			key_count;
    int			i;

    deconstruct_array(key_array,
                      TEXTOID, -1, false, 'i',
                      &key_datums, &key_nulls, &key_count);

    if (key_count == 0)
    {
        aout = construct_empty_array(TEXTOID);
        PG_RETURN_POINTER(aout);
    }

    out_datums = palloc(sizeof(Datum) * key_count);
    out_nulls = palloc(sizeof(bool) * key_count);

    for (i = 0; i < key_count; ++i)
    {
        text	   *key = (text *) DatumGetPointer(key_datums[i]);
        int			idx;

        if (key_nulls[i])
            idx = -1;
        else
            idx = hstoreFindKey(hs, NULL, VARDATA(key), VARSIZE(key) - VARHDRSZ);

        if (idx < 0 || HS_VALISNULL(entries, idx))
        {
            out_nulls[i] = true;
            out_datums[i] = (Datum) 0;
        }
        else
        {
            out_datums[i] = PointerGetDatum(
                                cstring_to_text_with_len(HS_VAL(entries, ptr, idx),
                                        HS_VALLEN(entries, idx)));
            out_nulls[i] = false;
        }
    }

    aout = construct_md_array(out_datums, out_nulls,
                              ARR_NDIM(key_array),
                              ARR_DIMS(key_array),
                              ARR_LBOUND(key_array),
                              TEXTOID, -1, false, 'i');

    PG_RETURN_POINTER(aout);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:60，代码来源:hstore_op.c

示例6: hstore_skeys

Datum
hstore_skeys(PG_FUNCTION_ARGS)
{
    FuncCallContext *funcctx;
    HStore	   *hs;
    int			i;

    if (SRF_IS_FIRSTCALL())
    {
        hs = PG_GETARG_HS(0);
        funcctx = SRF_FIRSTCALL_INIT();
        setup_firstcall(funcctx, hs, NULL);
    }

    funcctx = SRF_PERCALL_SETUP();
    hs = (HStore *) funcctx->user_fctx;
    i = funcctx->call_cntr;

    if (i < HS_COUNT(hs))
    {
        HEntry	   *entries = ARRPTR(hs);
        text	   *item;

        item = cstring_to_text_with_len(HS_KEY(entries, STRPTR(hs), i),
                                        HS_KEYLEN(entries, i));

        SRF_RETURN_NEXT(funcctx, PointerGetDatum(item));
    }

    SRF_RETURN_DONE(funcctx);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:31，代码来源:hstore_op.c

示例7: hstore_to_plperl

Datum
hstore_to_plperl(PG_FUNCTION_ARGS)
{
	HStore	   *in = PG_GETARG_HS(0);
	int			i;
	int			count = HS_COUNT(in);
	char	   *base = STRPTR(in);
	HEntry	   *entries = ARRPTR(in);
	HV		   *hv;

	hv = newHV();

	for (i = 0; i < count; i++)
	{
		const char *key;
		SV		   *value;

		key = pnstrdup(HS_KEY(entries, base, i), HS_KEYLEN(entries, i));
		value = HS_VALISNULL(entries, i) ? newSV(0) : cstr2sv(pnstrdup(HS_VAL(entries, base, i), HS_VALLEN(entries, i)));

		(void) hv_store(hv, key, strlen(key), value, 0);
	}

	return PointerGetDatum(newRV((SV *) hv));
}

开发者ID:DBInsight，项目名称:postgres，代码行数:25，代码来源:hstore_plperl.c

示例8: skeys

Datum
skeys(PG_FUNCTION_ARGS)
{
	FuncCallContext *funcctx;
	AKStore    *st;

	if (SRF_IS_FIRSTCALL())
	{
		HStore	   *hs = PG_GETARG_HS(0);

		funcctx = SRF_FIRSTCALL_INIT();
		setup_firstcall(funcctx, hs);
		PG_FREE_IF_COPY(hs, 0);
	}

	funcctx = SRF_PERCALL_SETUP();
	st = (AKStore *) funcctx->user_fctx;

	if (st->i < st->hs->size)
	{
		HEntry	   *ptr = &(ARRPTR(st->hs)[st->i]);
		text	   *item = (text *) palloc(VARHDRSZ + ptr->keylen);

		SET_VARSIZE(item, VARHDRSZ + ptr->keylen);
		memcpy(VARDATA(item), STRPTR(st->hs) + ptr->pos, ptr->keylen);
		st->i++;

		SRF_RETURN_NEXT(funcctx, PointerGetDatum(item));
	}

	pfree(st->hs);
	pfree(st);

	SRF_RETURN_DONE(funcctx);
}

开发者ID:AnLingm，项目名称:gpdb，代码行数:35，代码来源:hstore_op.c

示例9: hstore_akeys

Datum
hstore_akeys(PG_FUNCTION_ARGS)
{
    HStore	   *hs = PG_GETARG_HS(0);
    Datum	   *d;
    ArrayType  *a;
    HEntry	   *entries = ARRPTR(hs);
    char	   *base = STRPTR(hs);
    int			count = HS_COUNT(hs);
    int			i;

    if (count == 0)
    {
        a = construct_empty_array(TEXTOID);
        PG_RETURN_POINTER(a);
    }

    d = (Datum *) palloc(sizeof(Datum) * count);

    for (i = 0; i < count; ++i)
    {
        text	   *item = cstring_to_text_with_len(HS_KEY(entries, base, i),
                           HS_KEYLEN(entries, i));

        d[i] = PointerGetDatum(item);
    }

    a = construct_array(d, count,
                        TEXTOID, -1, false, 'i');

    PG_RETURN_POINTER(a);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:32，代码来源:hstore_op.c

示例10: hstore_to_matrix

Datum
hstore_to_matrix(PG_FUNCTION_ARGS)
{
    HStore	   *hs = PG_GETARG_HS(0);
    ArrayType  *out = hstore_to_array_internal(hs, 2);

    PG_RETURN_POINTER(out);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:8，代码来源:hstore_op.c

示例11: hstore_slice_to_hstore

Datum
hstore_slice_to_hstore(PG_FUNCTION_ARGS)
{
    HStore	   *hs = PG_GETARG_HS(0);
    HEntry	   *entries = ARRPTR(hs);
    char	   *ptr = STRPTR(hs);
    ArrayType  *key_array = PG_GETARG_ARRAYTYPE_P(1);
    HStore	   *out;
    int			nkeys;
    Pairs	   *key_pairs = hstoreArrayToPairs(key_array, &nkeys);
    Pairs	   *out_pairs;
    int			bufsiz;
    int			lastidx = 0;
    int			i;
    int			out_count = 0;

    if (nkeys == 0)
    {
        out = hstorePairs(NULL, 0, 0);
        PG_RETURN_POINTER(out);
    }

    out_pairs = palloc(sizeof(Pairs) * nkeys);
    bufsiz = 0;

    /*
     * we exploit the fact that the pairs list is already sorted into strictly
     * increasing order to narrow the hstoreFindKey search; each search can
     * start one entry past the previous "found" entry, or at the lower bound
     * of the last search.
     */

    for (i = 0; i < nkeys; ++i)
    {
        int			idx = hstoreFindKey(hs, &lastidx,
                                        key_pairs[i].key, key_pairs[i].keylen);

        if (idx >= 0)
        {
            out_pairs[out_count].key = key_pairs[i].key;
            bufsiz += (out_pairs[out_count].keylen = key_pairs[i].keylen);
            out_pairs[out_count].val = HS_VAL(entries, ptr, idx);
            bufsiz += (out_pairs[out_count].vallen = HS_VALLEN(entries, idx));
            out_pairs[out_count].isnull = HS_VALISNULL(entries, idx);
            out_pairs[out_count].needfree = false;
            ++out_count;
        }
    }

    /*
     * we don't use uniquePairs here because we know that the pairs list is
     * already sorted and uniq'ed.
     */

    out = hstorePairs(out_pairs, out_count, bufsiz);

    PG_RETURN_POINTER(out);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:58，代码来源:hstore_op.c

示例12: hstore_exists

Datum
hstore_exists(PG_FUNCTION_ARGS)
{
    HStore	   *hs = PG_GETARG_HS(0);
    text	   *key = PG_GETARG_TEXT_PP(1);
    int			idx = hstoreFindKey(hs, NULL,
                                    VARDATA_ANY(key), VARSIZE_ANY_EXHDR(key));

    PG_RETURN_BOOL(idx >= 0);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:10，代码来源:hstore_op.c

示例13: hstore_contains

Datum
hstore_contains(PG_FUNCTION_ARGS)
{
    HStore	   *val = PG_GETARG_HS(0);
    HStore	   *tmpl = PG_GETARG_HS(1);
    bool		res = true;
    HEntry	   *te = ARRPTR(tmpl);
    char	   *tstr = STRPTR(tmpl);
    HEntry	   *ve = ARRPTR(val);
    char	   *vstr = STRPTR(val);
    int			tcount = HS_COUNT(tmpl);
    int			lastidx = 0;
    int			i;

    /*
     * we exploit the fact that keys in "tmpl" are in strictly increasing
     * order to narrow the hstoreFindKey search; each search can start one
     * entry past the previous "found" entry, or at the lower bound of the
     * search
     */

    for (i = 0; res && i < tcount; ++i)
    {
        int			idx = hstoreFindKey(val, &lastidx,
                                        HS_KEY(te, tstr, i), HS_KEYLEN(te, i));

        if (idx >= 0)
        {
            bool		nullval = HS_VALISNULL(te, i);
            int			vallen = HS_VALLEN(te, i);

            if (nullval != HS_VALISNULL(ve, idx)
                    || (!nullval
                        && (vallen != HS_VALLEN(ve, idx)
                            || memcmp(HS_VAL(te, tstr, i), HS_VAL(ve, vstr, idx), vallen))))
                res = false;
        }
        else
            res = false;
    }

    PG_RETURN_BOOL(res);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:43，代码来源:hstore_op.c

示例14: hstore_out

Datum
hstore_out(PG_FUNCTION_ARGS)
{
	HStore	   *in = PG_GETARG_HS(0);
	int			buflen,
				i;
	char	   *out,
			   *ptr;
	char	   *base = STRPTR(in);
	HEntry	   *entries = ARRPTR(in);

	if (in->size == 0)
	{
		out = palloc(1);
		*out = '\0';
		PG_FREE_IF_COPY(in, 0);
		PG_RETURN_CSTRING(out);
	}

	buflen = (4 /* " */ + 2 /* => */ + 2 /* , */ ) * in->size +
		2 /* esc */ * (in->len - CALCDATASIZE(in->size, 0));

	out = ptr = palloc(buflen);
	for (i = 0; i < in->size; i++)
	{
		*ptr++ = '"';
		ptr = cpw(ptr, base + entries[i].pos, entries[i].keylen);
		*ptr++ = '"';
		*ptr++ = '=';
		*ptr++ = '>';
		if (entries[i].valisnull)
		{
			*ptr++ = 'N';
			*ptr++ = 'U';
			*ptr++ = 'L';
			*ptr++ = 'L';
		}
		else
		{
			*ptr++ = '"';
			ptr = cpw(ptr, base + entries[i].pos + entries[i].keylen, entries[i].vallen);
			*ptr++ = '"';
		}

		if (i + 1 != in->size)
		{
			*ptr++ = ',';
			*ptr++ = ' ';
		}
	}
	*ptr = '\0';

	PG_FREE_IF_COPY(in, 0);
	PG_RETURN_CSTRING(out);
}

开发者ID:berkeley-cs186，项目名称:course-fa07，代码行数:55，代码来源:hstore_io.c

示例15: hstore_defined

Datum
hstore_defined(PG_FUNCTION_ARGS)
{
    HStore	   *hs = PG_GETARG_HS(0);
    text	   *key = PG_GETARG_TEXT_PP(1);
    HEntry	   *entries = ARRPTR(hs);
    int			idx = hstoreFindKey(hs, NULL,
                                    VARDATA_ANY(key), VARSIZE_ANY_EXHDR(key));
    bool		res = (idx >= 0 && !HS_VALISNULL(entries, idx));

    PG_RETURN_BOOL(res);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:12，代码来源:hstore_op.c

示例16: hstore_each

Datum
hstore_each(PG_FUNCTION_ARGS)
{
    FuncCallContext *funcctx;
    HStore	   *hs;
    int			i;

    if (SRF_IS_FIRSTCALL())
    {
        hs = PG_GETARG_HS(0);
        funcctx = SRF_FIRSTCALL_INIT();
        setup_firstcall(funcctx, hs, fcinfo);
    }

    funcctx = SRF_PERCALL_SETUP();
    hs = (HStore *) funcctx->user_fctx;
    i = funcctx->call_cntr;

    if (i < HS_COUNT(hs))
    {
        HEntry	   *entries = ARRPTR(hs);
        char	   *ptr = STRPTR(hs);
        Datum		res,
                    dvalues[2];
        bool		nulls[2] = {false, false};
        text	   *item;
        HeapTuple	tuple;

        item = cstring_to_text_with_len(HS_KEY(entries, ptr, i),
                                        HS_KEYLEN(entries, i));
        dvalues[0] = PointerGetDatum(item);

        if (HS_VALISNULL(entries, i))
        {
            dvalues[1] = (Datum) 0;
            nulls[1] = true;
        }
        else
        {
            item = cstring_to_text_with_len(HS_VAL(entries, ptr, i),
                                            HS_VALLEN(entries, i));
            dvalues[1] = PointerGetDatum(item);
        }

        tuple = heap_form_tuple(funcctx->tuple_desc, dvalues, nulls);
        res = HeapTupleGetDatum(tuple);

        SRF_RETURN_NEXT(funcctx, PointerGetDatum(res));
    }

    SRF_RETURN_DONE(funcctx);
}

开发者ID:nathanwadhwani，项目名称:recdb-postgresql，代码行数:52，代码来源:hstore_op.c

示例17: svals

Datum
svals(PG_FUNCTION_ARGS)
{
	FuncCallContext *funcctx;
	AKStore    *st;

	if (SRF_IS_FIRSTCALL())
	{
		HStore	   *hs = PG_GETARG_HS(0);

		funcctx = SRF_FIRSTCALL_INIT();
		setup_firstcall(funcctx, hs);
		PG_FREE_IF_COPY(hs, 0);
	}

	funcctx = SRF_PERCALL_SETUP();
	st = (AKStore *) funcctx->user_fctx;

	if (st->i < st->hs->size)
	{
		HEntry	   *ptr = &(ARRPTR(st->hs)[st->i]);

		if (ptr->valisnull)
		{
			ReturnSetInfo *rsi;

			st->i++;
			(funcctx)->call_cntr++;
			rsi = (ReturnSetInfo *) fcinfo->resultinfo;
			rsi->isDone = ExprMultipleResult;
			PG_RETURN_NULL();
		}
		else
		{
			int			vallen = ptr->vallen;
			text	   *item = (text *) palloc(VARHDRSZ + vallen);

			SET_VARSIZE(item, VARHDRSZ + vallen);
			memcpy(VARDATA(item), STRPTR(st->hs) + ptr->pos + ptr->keylen, vallen);
			st->i++;

			SRF_RETURN_NEXT(funcctx, PointerGetDatum(item));
		}
	}

	pfree(st->hs);
	pfree(st);

	SRF_RETURN_DONE(funcctx);
}

开发者ID:AnLingm，项目名称:gpdb，代码行数:50，代码来源:hstore_op.c

示例18: exists

Datum
exists(PG_FUNCTION_ARGS)
{
	HStore	   *hs = PG_GETARG_HS(0);
	text	   *key = PG_GETARG_TEXT_P(1);
	HEntry	   *entry;

	entry = findkey(hs, VARDATA(key), VARSIZE(key) - VARHDRSZ);

	PG_FREE_IF_COPY(hs, 0);
	PG_FREE_IF_COPY(key, 1);

	PG_RETURN_BOOL(entry);
}

开发者ID:AnLingm，项目名称:gpdb，代码行数:14，代码来源:hstore_op.c

示例19: hs_contains

Datum
hs_contains(PG_FUNCTION_ARGS)
{
	HStore	   *val = PG_GETARG_HS(0);
	HStore	   *tmpl = PG_GETARG_HS(1);
	bool		res = true;
	HEntry	   *te = ARRPTR(tmpl);
	char	   *vv = STRPTR(val);
	char	   *tv = STRPTR(tmpl);

	while (res && te - ARRPTR(tmpl) < tmpl->size)
	{
		HEntry	   *entry = findkey(val, tv + te->pos, te->keylen);

		if (entry)
		{
			if (te->valisnull || entry->valisnull)
			{
				if (!(te->valisnull && entry->valisnull))
					res = false;
			}
			else if (te->vallen != entry->vallen ||
					 strncmp(vv + entry->pos + entry->keylen,
							 tv + te->pos + te->keylen,
							 te->vallen))
				res = false;
		}
		else
			res = false;
		te++;
	}

	PG_FREE_IF_COPY(val, 0);
	PG_FREE_IF_COPY(tmpl, 1);

	PG_RETURN_BOOL(res);
}

开发者ID:AnLingm，项目名称:gpdb，代码行数:37，代码来源:hstore_op.c

示例20: exists

Datum
exists(PG_FUNCTION_ARGS)
{
	HStore	   *hs = PG_GETARG_HS(0);
	text	   *key = PG_GETARG_TEXT_P(1);
	HEntry	   *entry;
	bool		res;

	entry = findkey(hs, VARDATA(key), VARSIZE(key) - VARHDRSZ);
	res = (entry != NULL) ? true : false;

	PG_FREE_IF_COPY(hs, 0);
	PG_FREE_IF_COPY(key, 1);

	PG_RETURN_BOOL(res);
}

开发者ID:50wu，项目名称:gpdb，代码行数:16，代码来源:hstore_op.c

注：本文中的PG_GETARG_HS函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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C++ PG_GETARG_HS函数代码示例

示例1: hstore_to_plpython

示例2: gin_extract_hstore

示例3: hstore_exists_all

示例4: hstore_send

示例5: hstore_slice_to_array

示例6: hstore_skeys

示例7: hstore_to_plperl

示例8: skeys

示例9: hstore_akeys

示例10: hstore_to_matrix

示例11: hstore_slice_to_hstore

示例12: hstore_exists

示例13: hstore_contains

示例14: hstore_out

示例15: hstore_defined

示例16: hstore_each

示例17: svals

示例18: exists

示例19: hs_contains

示例20: exists

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