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pg_variables.c
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pg_variables.c
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/*-------------------------------------------------------------------------
*
* pg_variables.c
* Functions, which get or set variables values
*
* Copyright (c) 2015-2016, Postgres Professional
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "funcapi.h"
#include "access/htup_details.h"
#include "catalog/pg_type.h"
#include "parser/scansup.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/timestamp.h"
#include "utils/typcache.h"
#include "pg_variables.h"
PG_MODULE_MAGIC;
/* Scalar variables functions */
PG_FUNCTION_INFO_V1(variable_set_int);
PG_FUNCTION_INFO_V1(variable_get_int);
PG_FUNCTION_INFO_V1(variable_set_text);
PG_FUNCTION_INFO_V1(variable_get_text);
PG_FUNCTION_INFO_V1(variable_set_numeric);
PG_FUNCTION_INFO_V1(variable_get_numeric);
PG_FUNCTION_INFO_V1(variable_set_timestamp);
PG_FUNCTION_INFO_V1(variable_get_timestamp);
PG_FUNCTION_INFO_V1(variable_set_timestamptz);
PG_FUNCTION_INFO_V1(variable_get_timestamptz);
PG_FUNCTION_INFO_V1(variable_set_date);
PG_FUNCTION_INFO_V1(variable_get_date);
PG_FUNCTION_INFO_V1(variable_set_jsonb);
PG_FUNCTION_INFO_V1(variable_get_jsonb);
/* Functions to work with records */
PG_FUNCTION_INFO_V1(variable_insert);
PG_FUNCTION_INFO_V1(variable_update);
PG_FUNCTION_INFO_V1(variable_delete);
PG_FUNCTION_INFO_V1(variable_select);
PG_FUNCTION_INFO_V1(variable_select_by_value);
PG_FUNCTION_INFO_V1(variable_select_by_values);
/* Functions to work with packages */
PG_FUNCTION_INFO_V1(variable_exists);
PG_FUNCTION_INFO_V1(package_exists);
PG_FUNCTION_INFO_V1(remove_variable);
PG_FUNCTION_INFO_V1(remove_package);
PG_FUNCTION_INFO_V1(remove_packages);
PG_FUNCTION_INFO_V1(get_packages_and_variables);
PG_FUNCTION_INFO_V1(get_packages_stats);
static void getKeyFromName(text *name, char *key);
static void ensurePackagesHashExists();
static HashPackageEntry *getPackageByName(text *name, bool create, bool strict);
static HashVariableEntry *getVariableByNameWithType(HTAB *variables,
text *name,
Oid typid,
bool create,
bool strict);
#define CHECK_ARGS_FOR_NULL() \
do { \
if (fcinfo->argnull[0]) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("package name can not be NULL"))); \
if (fcinfo->argnull[1]) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("variable name can not be NULL"))); \
} while(0)
static HTAB *packagesHash = NULL;
static MemoryContext ModuleContext = NULL;
/* Recent package */
static HashPackageEntry *LastPackage = NULL;
/* Recent variable */
static HashVariableEntry *LastVariable = NULL;
/*
* Set value of variable, typlen could be 0 if typbyval == true
*/
static void
variable_set(text *package_name, text *var_name,
Oid typid, Datum value, bool is_null)
{
HashPackageEntry *package;
HashVariableEntry *variable;
ScalarVar *scalar;
package = getPackageByName(package_name, true, false);
variable = getVariableByNameWithType(package->variablesHash,
var_name, typid, true, false);
scalar = &variable->value.scalar;
/* Release memory for variable */
if (scalar->typbyval == false && scalar->is_null == false)
pfree(DatumGetPointer(scalar->value));
scalar->is_null = is_null;
if (!scalar->is_null)
{
MemoryContext oldcxt;
oldcxt = MemoryContextSwitchTo(package->hctx);
scalar->value = datumCopy(value, scalar->typbyval, scalar->typlen);
MemoryContextSwitchTo(oldcxt);
}
else
scalar->value = 0;
}
static Datum
variable_get(text *package_name, text *var_name,
Oid typid, bool *is_null, bool strict)
{
HashPackageEntry *package;
HashVariableEntry *variable;
ScalarVar *scalar;
package = getPackageByName(package_name, false, strict);
if (package == NULL)
{
*is_null = true;
return 0;
}
variable = getVariableByNameWithType(package->variablesHash,
var_name, typid, false, strict);
if (variable == NULL)
{
*is_null = true;
return 0;
}
scalar = &(variable->value.scalar);
*is_null = scalar->is_null;
return scalar->value;
}
Datum
variable_set_int(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
variable_set(package_name, var_name, INT4OID,
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2),
PG_ARGISNULL(2));
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_get_int(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
bool strict;
bool is_null;
Datum value;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
strict = PG_GETARG_BOOL(2);
value = variable_get(package_name, var_name,
INT4OID, &is_null, strict);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (!is_null)
PG_RETURN_DATUM(value);
else
PG_RETURN_NULL();
}
Datum
variable_set_text(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
variable_set(package_name, var_name, TEXTOID,
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2),
PG_ARGISNULL(2));
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_get_text(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
bool strict;
bool is_null;
Datum value;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
strict = PG_GETARG_BOOL(2);
value = variable_get(package_name, var_name,
TEXTOID, &is_null, strict);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (!is_null)
PG_RETURN_DATUM(value);
else
PG_RETURN_NULL();
}
Datum
variable_set_numeric(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
variable_set(package_name, var_name, NUMERICOID,
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2),
PG_ARGISNULL(2));
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_get_numeric(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
bool strict;
bool is_null;
Datum value;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
strict = PG_GETARG_BOOL(2);
value = variable_get(package_name, var_name,
NUMERICOID, &is_null, strict);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (!is_null)
PG_RETURN_DATUM(value);
else
PG_RETURN_NULL();
}
Datum
variable_set_timestamp(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
variable_set(package_name, var_name, TIMESTAMPOID,
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2),
PG_ARGISNULL(2));
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_get_timestamp(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
bool strict;
bool is_null;
Datum value;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
strict = PG_GETARG_BOOL(2);
value = variable_get(package_name, var_name,
TIMESTAMPOID, &is_null, strict);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (!is_null)
PG_RETURN_DATUM(value);
else
PG_RETURN_NULL();
}
Datum
variable_set_timestamptz(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
variable_set(package_name, var_name, TIMESTAMPTZOID,
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2),
PG_ARGISNULL(2));
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_get_timestamptz(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
bool strict;
bool is_null;
Datum value;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
strict = PG_GETARG_BOOL(2);
value = variable_get(package_name, var_name,
TIMESTAMPTZOID, &is_null, strict);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (!is_null)
PG_RETURN_DATUM(value);
else
PG_RETURN_NULL();
}
Datum
variable_set_date(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
variable_set(package_name, var_name, DATEOID,
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2),
PG_ARGISNULL(2));
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_get_date(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
bool strict;
bool is_null;
Datum value;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
strict = PG_GETARG_BOOL(2);
value = variable_get(package_name, var_name,
DATEOID, &is_null, strict);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (!is_null)
PG_RETURN_DATUM(value);
else
PG_RETURN_NULL();
}
Datum
variable_set_jsonb(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
variable_set(package_name, var_name, JSONBOID,
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2),
PG_ARGISNULL(2));
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_get_jsonb(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
bool strict;
bool is_null;
Datum value;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
strict = PG_GETARG_BOOL(2);
value = variable_get(package_name, var_name,
JSONBOID, &is_null, strict);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (!is_null)
PG_RETURN_DATUM(value);
else
PG_RETURN_NULL();
}
Datum
variable_insert(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
HeapTupleHeader rec;
HashPackageEntry *package;
HashVariableEntry *variable;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
/* Checks */
CHECK_ARGS_FOR_NULL();
if (PG_ARGISNULL(2))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("record argument can not be NULL")));
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
rec = PG_GETARG_HEAPTUPLEHEADER(2);
/* Get cached package */
if (LastPackage == NULL ||
VARSIZE_ANY_EXHDR(package_name) != strlen(LastPackage->name) ||
strncmp(VARDATA_ANY(package_name), LastPackage->name,
VARSIZE_ANY_EXHDR(package_name)) != 0)
{
package = getPackageByName(package_name, true, false);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(LastVariable->name) ||
strncmp(VARDATA_ANY(var_name), LastVariable->name,
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = getVariableByNameWithType(package->variablesHash,
var_name, RECORDOID, true, false);
LastVariable = variable;
}
else
variable = LastVariable;
/* Insert a record */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
if (!variable->value.record.tupdesc)
{
/*
* This is the first record for the var_name. Initialize attributes.
*/
init_attributes(variable, tupdesc, package->hctx);
}
else
check_attributes(variable, tupdesc);
insert_record(variable, rec);
/* Release resources */
ReleaseTupleDesc(tupdesc);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_VOID();
}
Datum
variable_update(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
HeapTupleHeader rec;
HashPackageEntry *package;
HashVariableEntry *variable;
bool res;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
/* Checks */
CHECK_ARGS_FOR_NULL();
if (PG_ARGISNULL(2))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("record argument can not be NULL")));
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
rec = PG_GETARG_HEAPTUPLEHEADER(2);
/* Get cached package */
if (LastPackage == NULL ||
VARSIZE_ANY_EXHDR(package_name) != strlen(LastPackage->name) ||
strncmp(VARDATA_ANY(package_name), LastPackage->name,
VARSIZE_ANY_EXHDR(package_name)) != 0)
{
package = getPackageByName(package_name, false, true);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(LastVariable->name) ||
strncmp(VARDATA_ANY(var_name), LastVariable->name,
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = getVariableByNameWithType(package->variablesHash,
var_name, RECORDOID, false, true);
LastVariable = variable;
}
else
variable = LastVariable;
/* Update a record */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
check_attributes(variable, tupdesc);
res = update_record(variable, rec);
/* Release resources */
ReleaseTupleDesc(tupdesc);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(res);
}
Datum
variable_delete(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
Oid value_type;
Datum value;
bool value_is_null = PG_ARGISNULL(2);
HashPackageEntry *package;
HashVariableEntry *variable;
bool res;
CHECK_ARGS_FOR_NULL();
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
if (!value_is_null)
{
value_type = get_fn_expr_argtype(fcinfo->flinfo, 2);
value = PG_GETARG_DATUM(2);
}
else
{
value_type = InvalidOid;
value = 0;
}
/* Get cached package */
if (LastPackage == NULL ||
VARSIZE_ANY_EXHDR(package_name) != strlen(LastPackage->name) ||
strncmp(VARDATA_ANY(package_name), LastPackage->name,
VARSIZE_ANY_EXHDR(package_name)) != 0)
{
package = getPackageByName(package_name, false, true);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(LastVariable->name) ||
strncmp(VARDATA_ANY(var_name), LastVariable->name,
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = getVariableByNameWithType(package->variablesHash, var_name,
RECORDOID, false, true);
LastVariable = variable;
}
else
variable = LastVariable;
/* Delete a record */
if (!value_is_null)
check_record_key(variable, value_type);
res = delete_record(variable, value, value_is_null);
/* Release resources */
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(res);
}
Datum
variable_select(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
HASH_SEQ_STATUS *rstat;
HashRecordEntry *item;
if (SRF_IS_FIRSTCALL())
{
text *package_name;
text *var_name;
HashPackageEntry *package;
HashVariableEntry *variable;
MemoryContext oldcontext;
RecordVar *record;
CHECK_ARGS_FOR_NULL();
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackageByName(package_name, false, true);
variable = getVariableByNameWithType(package->variablesHash,
var_name, RECORDOID, false, true);
record = &(variable->value.record);
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
funcctx->tuple_desc = CreateTupleDescCopy(record->tupdesc);
rstat = (HASH_SEQ_STATUS *) palloc0(sizeof(HASH_SEQ_STATUS));
hash_seq_init(rstat, record->rhash);
funcctx->user_fctx = rstat;
MemoryContextSwitchTo(oldcontext);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
}
funcctx = SRF_PERCALL_SETUP();
/* Get next hash record */
rstat = (HASH_SEQ_STATUS *) funcctx->user_fctx;
item = (HashRecordEntry *) hash_seq_search(rstat);
if (item != NULL)
{
Datum result;
result = HeapTupleGetDatum(item->tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
{
pfree(rstat);
SRF_RETURN_DONE(funcctx);
}
}
Datum
variable_select_by_value(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
Oid value_type;
Datum value;
bool value_is_null = PG_ARGISNULL(2);
HashPackageEntry *package;
HashVariableEntry *variable;
HashRecordEntry *item;
RecordVar *record;
HashRecordKey k;
bool found;
CHECK_ARGS_FOR_NULL();
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
if (!value_is_null)
{
value_type = get_fn_expr_argtype(fcinfo->flinfo, 2);
value = PG_GETARG_DATUM(2);
}
else
{
value_type = InvalidOid;
value = 0;
}
package = getPackageByName(package_name, false, true);
variable = getVariableByNameWithType(package->variablesHash,
var_name, RECORDOID, false, true);
if (!value_is_null)
check_record_key(variable, value_type);
record = &(variable->value.record);
/* Search a record */
k.value = value;
k.is_null = value_is_null;
k.hash_proc = &record->hash_proc;
k.cmp_proc = &record->cmp_proc;
item = (HashRecordEntry *) hash_search(record->rhash, &k,
HASH_FIND, &found);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
if (found)
PG_RETURN_DATUM(HeapTupleGetDatum(item->tuple));
else
PG_RETURN_NULL();
}
/* Structure for variable_select_by_values() */
typedef struct
{
HashVariableEntry *variable;
ArrayIterator iterator;
} VariableIteratorRec;
Datum
variable_select_by_values(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
VariableIteratorRec *var;
Datum value;
HashRecordEntry *item;
bool isnull;
if (SRF_IS_FIRSTCALL())
{
text *package_name;
text *var_name;
ArrayType *values;
HashPackageEntry *package;
HashVariableEntry *variable;
MemoryContext oldcontext;
/* Checks */
CHECK_ARGS_FOR_NULL();
if (PG_ARGISNULL(2))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("array argument can not be NULL")));
values = PG_GETARG_ARRAYTYPE_P(2);
if (ARR_NDIM(values) > 1)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("searching for elements in multidimensional arrays is not supported")));
/* Get arguments */
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackageByName(package_name, false, true);
variable = getVariableByNameWithType(package->variablesHash,
var_name, RECORDOID, false, true);
check_record_key(variable, ARR_ELEMTYPE(values));
funcctx = SRF_FIRSTCALL_INIT();
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
funcctx->tuple_desc = CreateTupleDescCopy(variable->value.record.tupdesc);
var = (VariableIteratorRec *) palloc(sizeof(VariableIteratorRec));
var->iterator = array_create_iterator(values, 0, NULL);
var->variable = variable;
funcctx->user_fctx = var;
MemoryContextSwitchTo(oldcontext);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
}
funcctx = SRF_PERCALL_SETUP();
var = (VariableIteratorRec *) funcctx->user_fctx;
/* Get next array element */
while (array_iterate(var->iterator, &value, &isnull))
{
HashRecordKey k;
bool found;
RecordVar *record;
record = &(var->variable->value.record);
/* Search a record */
k.value = value;
k.is_null = isnull;
k.hash_proc = &record->hash_proc;
k.cmp_proc = &record->cmp_proc;
item = (HashRecordEntry *) hash_search(record->rhash, &k,
HASH_FIND, &found);
if (found)
{
Datum result;
result = HeapTupleGetDatum(item->tuple);
SRF_RETURN_NEXT(funcctx, result);
}
}
array_free_iterator(var->iterator);
pfree(var);
SRF_RETURN_DONE(funcctx);
}
static void
clean_variable(HashVariableEntry *variable)
{
if (variable->typid == RECORDOID)
clean_records(variable);
else if (variable->value.scalar.typbyval == false &&
variable->value.scalar.is_null == false)
pfree(DatumGetPointer(variable->value.scalar.value));
}
/*
* Check if variable exists.
*/
Datum
variable_exists(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
HashPackageEntry *package;
char key[NAMEDATALEN];
bool found;
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackageByName(package_name, false, false);
if (package == NULL)
{
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(false);
}
getKeyFromName(var_name, key);
hash_search(package->variablesHash, key, HASH_FIND, &found);
PG_FREE_IF_COPY(package_name, 0);
PG_FREE_IF_COPY(var_name, 1);
PG_RETURN_BOOL(found);
}
/*
* Check if package exists.
*/
Datum
package_exists(PG_FUNCTION_ARGS)
{
text *package_name;
bool res;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("package name can not be NULL")));
package_name = PG_GETARG_TEXT_PP(0);
res = getPackageByName(package_name, false, false) != NULL;
PG_FREE_IF_COPY(package_name, 0);
PG_RETURN_BOOL(res);
}
/*
* Remove variable from package by name.
*/
Datum
remove_variable(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
HashPackageEntry *package;
HashVariableEntry *variable;
bool found;
char key[NAMEDATALEN];
CHECK_ARGS_FOR_NULL();
package_name = PG_GETARG_TEXT_PP(0);
var_name = PG_GETARG_TEXT_PP(1);
package = getPackageByName(package_name, false, true);