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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) 2015-2022, Postgres Professional
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "parser/scansup.h"
#include "storage/proc.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;
/* 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);
extern void _PG_init(void);
#if PG_VERSION_NUM < 150000
extern void _PG_fini(void);
#endif
static void ensurePackagesHashExists(void);
static void getKeyFromName(text *name, char *key);
static Package *getPackage(text *name, bool strict);
static Package *createPackage(text *name, bool is_trans);
static Variable *getVariableInternal(Package *package, text *name,
Oid typid, bool is_record, bool strict);
static Variable *createVariableInternal(Package *package, text *name, Oid typid,
bool is_record, bool is_transactional);
static void removePackageInternal(Package *package);
static void resetVariablesCache(void);
/* Functions to work with transactional objects */
static void createSavepoint(TransObject *object, TransObjectType type);
static void releaseSavepoint(TransObject *object, TransObjectType type, bool sub);
static void rollbackSavepoint(TransObject *object, TransObjectType type, bool sub);
static void copyValue(VarState *src, VarState *dest, Variable *destVar);
static void freeValue(VarState *varstate, bool is_record);
static void removeState(TransObject *object, TransObjectType type,
TransState *stateToDelete);
static bool isObjectChangedInCurrentTrans(TransObject *object);
static bool isObjectChangedInUpperTrans(TransObject *object);
static void addToChangesStack(TransObject *object, TransObjectType type);
static void addToChangesStackUpperLevel(TransObject *object,
TransObjectType type);
static void pushChangesStack(void);
static int numOfRegVars(Package *package);
#ifdef PGPRO_EE
static void pgvSaveContext(void);
static void pgvRestoreContext(void);
#endif
/* Constructors */
static void makePackHTAB(Package *package, bool is_trans);
static inline ChangedObject * makeChangedObject(TransObject *object,
MemoryContext ctx);
static void initObjectHistory(TransObject *object, TransObjectType type);
/* Hook functions */
static void variable_ExecutorEnd(QueryDesc *queryDesc);
#if PG_VERSION_NUM >= 120000
#define CHECK_ARGS_FOR_NULL() \
do { \
if (fcinfo->args[0].isnull) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("package name can not be NULL"))); \
if (fcinfo->args[1].isnull) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("variable name can not be NULL"))); \
} while(0)
#else /* PG_VERSION_NUM < 120000 */
#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)
#endif /* PG_VERSION_NUM */
/* User controlled GUCs */
bool convert_unknownoid_guc;
bool convert_unknownoid;
static HTAB *packagesHash = NULL;
static MemoryContext ModuleContext = NULL;
/* Recent package */
static Package *LastPackage = NULL;
/* Recent variable */
static Variable *LastVariable = NULL;
/* Saved hook values for recall */
static ExecutorEnd_hook_type prev_ExecutorEnd = NULL;
/* This stack contains lists of changed variables and packages per each subxact level */
static dlist_head *changesStack = NULL;
static MemoryContext changesStackContext = NULL;
/*
* List to store all the running hash_seq_search, variable and package scan for
* hash table.
*
* NOTE: In function variable_select we use hash_seq_search to find next tuple.
* So, in case user do not get all the data from set at once (use cursors or
* LIMIT) we have to call hash_seq_term to not to leak hash_seq_search scans.
*
* For doing this, we alloc all of the rstats in the TopTransactionContext and
* save pointers to the rstats into list. Once transaction ended (commited or
* aborted) we clear all the "active" hash_seq_search by calling hash_seq_term.
*
* TopTransactionContext is handy here, because it would not be reset by the
* time pgvTransCallback is called.
*/
static List *variables_stats = NIL;
static List *packages_stats = NIL;
typedef struct tagVariableStatEntry
{
HTAB *hash;
HASH_SEQ_STATUS *status;
Variable *variable;
Package *package;
Levels levels;
void **user_fctx; /* pointer to funcctx->user_fctx */
} VariableStatEntry;
typedef struct tagPackageStatEntry
{
HASH_SEQ_STATUS *status;
Levels levels;
void **user_fctx; /* pointer to funcctx->user_fctx */
} PackageStatEntry;
#ifdef PGPRO_EE
/*
* Context for storing/restoring parameters when switching autonomous
* transactions
*/
typedef struct PgvContextStruct
{
dlist_head *changesStack;
MemoryContext changesStackContext;
struct PgvContextStruct *next;
} PgvContextStruct;
static PgvContextStruct *pgv_context = NULL;
#endif /* PGPRO_EE */
/*
* Compare functions for VariableStatEntry and PackageStatEntry members.
*/
static bool
VariableStatEntry_status_eq(void *entry, void *value)
{
return ((VariableStatEntry *) entry)->status == (HASH_SEQ_STATUS *) value;
}
static bool
VariableStatEntry_variable_eq(void *entry, void *value)
{
return ((VariableStatEntry *) entry)->variable == (Variable *) value;
}
static bool
VariableStatEntry_package_eq(void *entry, void *value)
{
return ((VariableStatEntry *) entry)->package == (Package *) value;
}
static bool
VariableStatEntry_eq_all(void *entry, void *value)
{
return true;
}
static bool
VariableStatEntry_level_eq(void *entry, void *value)
{
return
#ifdef PGPRO_EE
/* Compare ATX level */
((VariableStatEntry *) entry)->levels.atxlevel == ((Levels *) value)->atxlevel &&
#endif
((VariableStatEntry *) entry)->levels.level == ((Levels *) value)->level;
}
static bool
PackageStatEntry_status_eq(void *entry, void *value)
{
return ((PackageStatEntry *) entry)->status == (HASH_SEQ_STATUS *) value;
}
static bool
PackageStatEntry_level_eq(void *entry, void *value)
{
return
#ifdef PGPRO_EE
/* Compare ATX level */
((PackageStatEntry *) entry)->levels.atxlevel == ((Levels *) value)->atxlevel &&
#endif
((PackageStatEntry *) entry)->levels.level == ((Levels *) value)->level;
}
#ifdef PGPRO_EE
static bool
VariableStatEntry_is_transactional(void *entry, void *value)
{
return ((VariableStatEntry *) entry)->variable->is_transactional;
}
#endif
/*
* VariableStatEntry and PackageStatEntry status member getters.
*/
static HASH_SEQ_STATUS *
VariableStatEntry_status_ptr(void *entry)
{
return ((VariableStatEntry *) entry)->status;
}
static HASH_SEQ_STATUS *
PackageStatEntry_status_ptr(void *entry)
{
return ((PackageStatEntry *) entry)->status;
}
/*
* VariableStatEntry and PackageStatEntry functions for clear function context.
*/
static void
VariableStatEntry_clear_fctx(void *entry)
{
VariableStatEntry *e = (VariableStatEntry *) entry;
if (e->user_fctx)
*e->user_fctx = NULL;
}
static void
PackageStatEntry_clear_fctx(void *entry)
{
PackageStatEntry *e = (PackageStatEntry *) entry;
if (e->user_fctx)
*e->user_fctx = NULL;
}
/*
* Generic remove_if algorithm.
*
* For every item in the list:
* 1. Comapare item with value by eq function call.
* 2. If eq return true, then step 3, else goto 7.
* 3. Delete item from list.
* 4. If term is true, call hash_seq_term.
* 5. Free memory.
* 6. If match_first if true return.
* 7. Fetch next item.
*
*/
typedef struct tagRemoveIfContext
{
List **list; /* target list */
void *value; /* value to compare with */
bool (*eq) (void *, void *); /* list item eq to value func */
HASH_SEQ_STATUS *(*getter) (void *); /* status getter */
bool match_first; /* return on first match */
bool term; /* hash_seq_term on match */
void (*clear_fctx) (void *); /* clear function context */
} RemoveIfContext;
static void
list_remove_if(RemoveIfContext ctx)
{
#if (PG_VERSION_NUM < 130000)
ListCell *cell,
*next,
*prev = NULL;
void *entry = NULL;
for (cell = list_head(*ctx.list); cell; cell = next)
{
entry = lfirst(cell);
next = lnext(cell);
if (ctx.eq(entry, ctx.value))
{
*ctx.list = list_delete_cell(*ctx.list, cell, prev);
if (ctx.term)
#ifdef PGPRO_EE
hash_seq_term_all_levels(ctx.getter(entry));
#else
hash_seq_term(ctx.getter(entry));
#endif
ctx.clear_fctx(entry);
pfree(ctx.getter(entry));
pfree(entry);
if (ctx.match_first)
return;
}
else
{
prev = cell;
}
}
#else
/*
* See
* https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=1cff1b95ab6ddae32faa3efe0d95a820dbfdc164
*
* Version >= 13 have different lists interface.
*/
ListCell *cell;
void *entry = NULL;
foreach(cell, *ctx.list)
{
entry = lfirst(cell);
if (ctx.eq(entry, ctx.value))
{
*ctx.list = foreach_delete_current(*ctx.list, cell);
if (ctx.term)
#ifdef PGPRO_EE
hash_seq_term_all_levels(ctx.getter(entry));
#else
hash_seq_term(ctx.getter(entry));
#endif
ctx.clear_fctx(entry);
pfree(ctx.getter(entry));
pfree(entry);
if (ctx.match_first)
return;
}
}
#endif
}
/*
* Remove first entry for status.
*/
static void
remove_variables_status(List **list, HASH_SEQ_STATUS *status)
{
RemoveIfContext ctx =
{
.list = list,
.value = status,
.eq = VariableStatEntry_status_eq,
.getter = VariableStatEntry_status_ptr,
.match_first = true,
.term = false,
.clear_fctx = VariableStatEntry_clear_fctx
};
list_remove_if(ctx);
}
/*
* Remove first entry for variable.
*/
static void
remove_variables_variable(List **list, Variable *variable)
{
/*
* It may be more than one item in the list for each variable in case of
* cursor. So match_first is false here.
*/
RemoveIfContext ctx =
{
.list = list,
.value = variable,
.eq = VariableStatEntry_variable_eq,
.getter = VariableStatEntry_status_ptr,
.match_first = false,
.term = true,
.clear_fctx = VariableStatEntry_clear_fctx
};
list_remove_if(ctx);
}
/*
* Remove all the entries for package.
*/
static void
remove_variables_package(List **list, Package *package)
{
RemoveIfContext ctx =
{
.list = list,
.value = package,
.eq = VariableStatEntry_package_eq,
.getter = VariableStatEntry_status_ptr,
.match_first = false,
.term = true,
.clear_fctx = VariableStatEntry_clear_fctx
};
list_remove_if(ctx);
}
/*
* Remove all the entries for level.
*/
static void
remove_variables_level(List **list, Levels *levels)
{
RemoveIfContext ctx =
{
.list = list,
.value = levels,
.eq = VariableStatEntry_level_eq,
.getter = VariableStatEntry_status_ptr,
.match_first = false,
.term = false,
.clear_fctx = VariableStatEntry_clear_fctx
};
list_remove_if(ctx);
}
/*
* Delete variables stats list.
*/
static void
remove_variables_all(List **list)
{
RemoveIfContext ctx =
{
.list = list,
.value = NULL,
.eq = VariableStatEntry_eq_all,
.getter = VariableStatEntry_status_ptr,
.match_first = false,
.term = true,
.clear_fctx = VariableStatEntry_clear_fctx
};
list_remove_if(ctx);
}
/*
* Remove first entrie with status for packages list.
*/
static void
remove_packages_status(List **list, HASH_SEQ_STATUS *status)
{
RemoveIfContext ctx =
{
.list = list,
.value = status,
.eq = PackageStatEntry_status_eq,
.getter = PackageStatEntry_status_ptr,
.match_first = true,
.term = false,
.clear_fctx = PackageStatEntry_clear_fctx
};
list_remove_if(ctx);
}
/*
* Remove all the entries with level for packages list.
*/
static void
remove_packages_level(List **list, Levels *levels)
{
RemoveIfContext ctx =
{
.list = list,
.value = levels,
.eq = PackageStatEntry_level_eq,
.getter = PackageStatEntry_status_ptr,
.match_first = false,
.term = true,
.clear_fctx = PackageStatEntry_clear_fctx
};
list_remove_if(ctx);
}
#ifdef PGPRO_EE
/*
* Remove all transactional entries.
*/
static void
remove_variables_transactional(List **list)
{
RemoveIfContext ctx =
{
.list = list,
.value = NULL,
.eq = VariableStatEntry_is_transactional,
.getter = VariableStatEntry_status_ptr,
.match_first = false,
.term = true,
.clear_fctx = VariableStatEntry_clear_fctx
};
list_remove_if(ctx);
}
#endif
static void freeStatsLists(void);
/* Returns a lists of packages and variables changed at current subxact level */
#define get_actual_changes_list() \
( \
AssertMacro(changesStack != NULL), \
(dlist_head_element(ChangesStackNode, node, changesStack)) \
)
#define pack_hctx(pack, is_trans) \
(is_trans ? pack->hctxTransact : pack->hctxRegular)
#define pack_htab(pack, is_trans) \
(is_trans ? pack->varHashTransact : pack->varHashRegular)
#define PGV_MCXT_MAIN "pg_variables: main memory context"
#define PGV_MCXT_VARS "pg_variables: variables hash"
#define PGV_MCXT_STACK "pg_variables: changesStack"
#define PGV_MCXT_STACK_NODE "pg_variables: changesStackNode"
#ifndef ALLOCSET_DEFAULT_SIZES
#define ALLOCSET_DEFAULT_SIZES \
ALLOCSET_DEFAULT_MINSIZE, ALLOCSET_DEFAULT_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE
#endif
#ifndef ALLOCSET_START_SMALL_SIZES
#define ALLOCSET_START_SMALL_SIZES \
ALLOCSET_SMALL_MINSIZE, ALLOCSET_SMALL_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE
#endif
/*
* 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, bool is_transactional)
{
Package *package;
Variable *variable;
ScalarVar *scalar;
package = createPackage(package_name, is_transactional);
variable = createVariableInternal(package, var_name, typid, false,
is_transactional);
scalar = &(GetActualValue(variable).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(pack_hctx(package, is_transactional));
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)
{
Package *package;
Variable *variable;
ScalarVar *scalar;
package = getPackage(package_name, strict);
if (package == NULL)
{
*is_null = true;
return 0;
}
variable = getVariableInternal(package, var_name, typid, false, strict);
if (variable == NULL)
{
*is_null = true;
return 0;
}
scalar = &(GetActualValue(variable).scalar);
*is_null = scalar->is_null;
return scalar->value;
}
#define VARIABLE_GET_TEMPLATE(pkg_arg, var_arg, strict_arg, type, typid) \
PG_FUNCTION_INFO_V1(variable_get_##type); \
Datum \
variable_get_##type(PG_FUNCTION_ARGS) \
{ \
text *package_name; \
text *var_name; \
bool strict; \
bool isnull; \
Datum value; \
\
CHECK_ARGS_FOR_NULL(); \
\
package_name = PG_GETARG_TEXT_PP(pkg_arg); \
var_name = PG_GETARG_TEXT_PP(var_arg); \
strict = PG_GETARG_BOOL(strict_arg); \
\
value = variable_get(package_name, var_name, \
(typid), &isnull, strict); \
\
PG_FREE_IF_COPY(package_name, pkg_arg); \
PG_FREE_IF_COPY(var_name, var_arg); \
\
if (!isnull) \
PG_RETURN_DATUM(value); \
else \
PG_RETURN_NULL(); \
}
/* deprecated functions */
VARIABLE_GET_TEMPLATE(0, 1, 2, int, INT4OID)
VARIABLE_GET_TEMPLATE(0, 1, 2, text, TEXTOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, numeric, NUMERICOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, timestamp, TIMESTAMPOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, timestamptz, TIMESTAMPTZOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, date, DATEOID)
VARIABLE_GET_TEMPLATE(0, 1, 2, jsonb, JSONBOID)
/* current API */
VARIABLE_GET_TEMPLATE(0, 1, 3, any, get_fn_expr_argtype(fcinfo->flinfo, 2))
VARIABLE_GET_TEMPLATE(0, 1, 3, array, get_fn_expr_argtype(fcinfo->flinfo, 2))
#define VARIABLE_SET_TEMPLATE(type, typid) \
PG_FUNCTION_INFO_V1(variable_set_##type); \
Datum \
variable_set_##type(PG_FUNCTION_ARGS) \
{ \
text *package_name; \
text *var_name; \
bool is_transactional; \
\
CHECK_ARGS_FOR_NULL(); \
\
package_name = PG_GETARG_TEXT_PP(0); \
var_name = PG_GETARG_TEXT_PP(1); \
is_transactional = PG_GETARG_BOOL(3); \
\
variable_set(package_name, var_name, (typid), \
PG_ARGISNULL(2) ? 0 : PG_GETARG_DATUM(2), \
PG_ARGISNULL(2), is_transactional); \
\
PG_FREE_IF_COPY(package_name, 0); \
PG_FREE_IF_COPY(var_name, 1); \
PG_RETURN_VOID(); \
}
/* deprecated functions */
VARIABLE_SET_TEMPLATE(int, INT4OID)
VARIABLE_SET_TEMPLATE(text, TEXTOID)
VARIABLE_SET_TEMPLATE(numeric, NUMERICOID)
VARIABLE_SET_TEMPLATE(timestamp, TIMESTAMPOID)
VARIABLE_SET_TEMPLATE(timestamptz, TIMESTAMPTZOID)
VARIABLE_SET_TEMPLATE(date, DATEOID)
VARIABLE_SET_TEMPLATE(jsonb, JSONBOID)
/* current API */
VARIABLE_SET_TEMPLATE(any, get_fn_expr_argtype(fcinfo->flinfo, 2))
VARIABLE_SET_TEMPLATE(array, get_fn_expr_argtype(fcinfo->flinfo, 2))
Datum
variable_insert(PG_FUNCTION_ARGS)
{
text *package_name;
text *var_name;
HeapTupleHeader rec;
Package *package;
Variable *variable;
bool is_transactional;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc = NULL;
RecordVar *record;
/* 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);
is_transactional = PG_GETARG_BOOL(3);
/* Get cached package */
if (LastPackage == NULL ||
VARSIZE_ANY_EXHDR(package_name) != strlen(GetName(LastPackage)) ||
strncmp(VARDATA_ANY(package_name), GetName(LastPackage),
VARSIZE_ANY_EXHDR(package_name)) != 0 ||
!pack_htab(LastPackage, is_transactional))
{
package = createPackage(package_name, is_transactional);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(GetName(LastVariable)) ||
strncmp(VARDATA_ANY(var_name), GetName(LastVariable),
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = createVariableInternal(package, var_name, RECORDOID,
true, is_transactional);
LastVariable = variable;
}
else
{
TransObject *transObj;
if (LastVariable->is_transactional != is_transactional)
{
char key[NAMEDATALEN];
getKeyFromName(var_name, key);
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("variable \"%s\" already created as %sTRANSACTIONAL",
key, LastVariable->is_transactional ? "" : "NOT ")));
}
variable = LastVariable;
transObj = &variable->transObject;
if (variable->is_transactional &&
!isObjectChangedInCurrentTrans(transObj))
{
createSavepoint(transObj, TRANS_VARIABLE);
addToChangesStack(transObj, TRANS_VARIABLE);
}
}
/* Insert a record */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
record = &(GetActualValue(variable).record);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
if (!record->tupdesc || variable->is_deleted)
{
/*
* This is the first record for the var_name. Initialize record.
*/
/* Convert UNKNOWNOID to TEXTOID if needed
* tupdesc may be changed
*/
if (convert_unknownoid)
{
coerce_unknown_first_record(&tupdesc, &rec);
}
init_record(record, tupdesc, variable);
variable->is_deleted = false;
}
else
{
/*
* We need to check attributes of the new row if this is a transient
* record type or if last record has different id.
* Also we convert UNKNOWNOID to TEXTOID if needed.
* tupdesc may be changed
*/
check_attributes(variable, &rec, tupdesc);
}
insert_record(variable, rec);
/* Release resources */
if (tupdesc)
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;
Package *package;
Variable *variable;
TransObject *transObject;
bool res;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc = NULL;
/* 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(GetName(LastPackage)) ||
strncmp(VARDATA_ANY(package_name), GetName(LastPackage),
VARSIZE_ANY_EXHDR(package_name)) != 0)
{
package = getPackage(package_name, true);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(GetName(LastVariable)) ||
strncmp(VARDATA_ANY(var_name), GetName(LastVariable),
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = getVariableInternal(package, var_name, RECORDOID, true,
true);
LastVariable = variable;
}
else
variable = LastVariable;
transObject = &variable->transObject;
if (variable->is_transactional &&
!isObjectChangedInCurrentTrans(transObject))
{
createSavepoint(transObject, TRANS_VARIABLE);
addToChangesStack(transObject, TRANS_VARIABLE);
}
/* Update a record */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
/*
* Convert UNKNOWNOID to TEXTOID if needed
* tupdesc may be changed
*/
check_attributes(variable, &rec, tupdesc);
ReleaseTupleDesc(tupdesc);
res = update_record(variable, rec);
/* Release resources */
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);
Package *package;
Variable *variable;
TransObject *transObject;
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(GetName(LastPackage)) ||
strncmp(VARDATA_ANY(package_name), GetName(LastPackage),
VARSIZE_ANY_EXHDR(package_name)) != 0)
{
package = getPackage(package_name, true);
LastPackage = package;
LastVariable = NULL;
}
else
package = LastPackage;
/* Get cached variable */
if (LastVariable == NULL ||
VARSIZE_ANY_EXHDR(var_name) != strlen(GetName(LastVariable)) ||
strncmp(VARDATA_ANY(var_name), GetName(LastVariable),
VARSIZE_ANY_EXHDR(var_name)) != 0)
{
variable = getVariableInternal(package, var_name, RECORDOID, true,
true);
LastVariable = variable;
}
else
variable = LastVariable;
transObject = &variable->transObject;
if (variable->is_transactional &&
!isObjectChangedInCurrentTrans(transObject))
{