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dbms_sql.c
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#include "postgres.h"
#include "fmgr.h"
#include "funcapi.h"
#if PG_VERSION_NUM < 120000
#include "access/htup_details.h"
#endif
#include "access/tupconvert.h"
#include "catalog/pg_type_d.h"
#include "catalog/pg_type.h"
#include "executor/spi.h"
#include "lib/stringinfo.h"
#include "parser/parse_coerce.h"
#include "parser/scansup.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/elog.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/memutils.h"
#include "utils/typcache.h"
#include "executor/spi_priv.h"
#include "orafce.h"
#include "builtins.h"
#define MAX_CURSORS 100
/*
* bind variable data
*/
typedef struct
{
char *refname;
int position;
Datum value;
Oid typoid;
bool typbyval;
int16 typlen;
bool isnull;
unsigned int varno; /* number of assigned placeholder of parsed query */
bool is_array; /* true, when a value is assigned via bind_array */
Oid typelemid; /* Oid of element of a array */
bool typelembyval;
int16 typelemlen;
int index1;
int index2;
} VariableData;
/*
* Query result column definition
*/
typedef struct
{
int position;
Oid typoid;
bool typbyval;
int16 typlen;
int32 typmod;
bool typisstr;
Oid typarrayoid; /* oid of requested array output value */
uint64 rowcount; /* maximal rows of requested array */
int index1; /* output array should be rewrited from this index */
} ColumnData;
/*
* It is used for transformation result data to form
* generated by column_value procedure or column
* value function.
*/
typedef struct
{
bool isvalid; /* true, when this cast can be used */
bool without_cast; /* true, when cast is not necessary */
Oid targettypid; /* used for domains */
Oid array_targettypid; /* used for array domains */
int32 targettypmod; /* used for strings */
bool typbyval; /* used for copy result to outer memory context */
int16 typlen; /* used for copy result to outer memory context */
bool is_array;
Oid funcoid;
Oid funcoid_typmod;
CoercionPathType path;
CoercionPathType path_typmod;
FmgrInfo finfo;
FmgrInfo finfo_typmod;
FmgrInfo finfo_out;
FmgrInfo finfo_in;
Oid typIOParam;
} CastCacheData;
/*
* dbms_sql cursor definition
*/
typedef struct
{
int16 cid;
char *parsed_query;
char *original_query;
unsigned int nvariables;
int max_colpos;
List *variables;
List *columns;
char cursorname[32];
Portal portal; /* one shot (execute) plan */
SPIPlanPtr plan;
MemoryContext cursor_cxt;
MemoryContext cursor_xact_cxt;
MemoryContext tuples_cxt;
MemoryContext result_cxt; /* short life memory context */
HeapTuple tuples[1000];
TupleDesc coltupdesc;
TupleDesc tupdesc;
CastCacheData *casts;
uint64 processed;
uint64 nread;
uint64 start_read;
bool assigned;
bool executed;
Bitmapset *array_columns; /* set of array columns */
uint64 batch_rows; /* how much rows should be fetched to fill target arrays */
} CursorData;
typedef enum
{
TOKEN_SPACES,
TOKEN_COMMENT,
TOKEN_NUMBER,
TOKEN_BIND_VAR,
TOKEN_STR,
TOKEN_EXT_STR,
TOKEN_DOLAR_STR,
TOKEN_IDENTIF,
TOKEN_QIDENTIF,
TOKEN_DOUBLE_COLON,
TOKEN_OTHER,
TOKEN_NONE
} orafceTokenType;
static char *next_token(char *str, char **start, size_t *len, orafceTokenType *typ, char **sep, size_t *seplen);
PG_FUNCTION_INFO_V1(dbms_sql_is_open);
PG_FUNCTION_INFO_V1(dbms_sql_open_cursor);
PG_FUNCTION_INFO_V1(dbms_sql_close_cursor);
PG_FUNCTION_INFO_V1(dbms_sql_parse);
PG_FUNCTION_INFO_V1(dbms_sql_bind_variable);
PG_FUNCTION_INFO_V1(dbms_sql_bind_variable_f);
PG_FUNCTION_INFO_V1(dbms_sql_bind_array_3);
PG_FUNCTION_INFO_V1(dbms_sql_bind_array_5);
PG_FUNCTION_INFO_V1(dbms_sql_define_column);
PG_FUNCTION_INFO_V1(dbms_sql_define_array);
PG_FUNCTION_INFO_V1(dbms_sql_execute);
PG_FUNCTION_INFO_V1(dbms_sql_fetch_rows);
PG_FUNCTION_INFO_V1(dbms_sql_execute_and_fetch);
PG_FUNCTION_INFO_V1(dbms_sql_column_value);
PG_FUNCTION_INFO_V1(dbms_sql_column_value_f);
PG_FUNCTION_INFO_V1(dbms_sql_last_row_count);
PG_FUNCTION_INFO_V1(dbms_sql_describe_columns);
PG_FUNCTION_INFO_V1(dbms_sql_describe_columns_f);
PG_FUNCTION_INFO_V1(dbms_sql_debug_cursor);
static uint64 last_row_count = 0;
static MemoryContext persist_cxt = NULL;
static CursorData cursors[MAX_CURSORS];
static void
open_cursor(CursorData *c, int cid)
{
c->cid = cid;
if (!persist_cxt)
{
persist_cxt = AllocSetContextCreate(NULL,
"dbms_sql persist context",
ALLOCSET_DEFAULT_SIZES);
memset(cursors, 0, sizeof(cursors));
}
c->cursor_cxt = AllocSetContextCreate(persist_cxt,
"dbms_sql cursor context",
ALLOCSET_DEFAULT_SIZES);
c->assigned = true;
}
/*
* FUNCTION dbms_sql.open_cursor() RETURNS int
*/
Datum
dbms_sql_open_cursor(PG_FUNCTION_ARGS)
{
int i;
(void) fcinfo;
/* find and initialize first free slot */
for (i = 0; i < MAX_CURSORS; i++)
{
if (!cursors[i].assigned)
{
open_cursor(&cursors[i], i);
PG_RETURN_INT32(i);
}
}
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("too many opened cursors"),
errdetail("There is not free slot for new dbms_sql's cursor."),
errhint("You should to close unused cursors")));
/* be msvc quiet */
return (Datum) 0;
}
static CursorData *
get_cursor(FunctionCallInfo fcinfo, bool should_be_assigned)
{
CursorData *cursor;
int cid;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("cursor id is NULL")));
cid = PG_GETARG_INT32(0);
if (cid < 0 || cid >= MAX_CURSORS)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("value of cursor id is out of range")));
cursor = &cursors[cid];
if (!cursor->assigned && should_be_assigned)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_CURSOR),
errmsg("cursor is not valid")));
return cursor;
}
/*
* CREATE FUNCTION dbms_sql.is_open(c int) RETURNS bool;
*/
Datum
dbms_sql_is_open(PG_FUNCTION_ARGS)
{
CursorData *c;
c = get_cursor(fcinfo, false);
PG_RETURN_BOOL(c->assigned);
}
/*
* Release all sources assigned to cursor
*/
static void
close_cursor(CursorData *c)
{
if (c->executed && c->portal)
SPI_cursor_close(c->portal);
/* release all assigned memory */
if (c->cursor_cxt)
MemoryContextDelete(c->cursor_cxt);
if (c->cursor_xact_cxt)
MemoryContextDelete(c->cursor_xact_cxt);
if (c->plan)
SPI_freeplan(c->plan);
memset(c, 0, sizeof(CursorData));
}
/*
* PROCEDURE dbms_sql.close_cursor(c int)
*/
Datum
dbms_sql_close_cursor(PG_FUNCTION_ARGS)
{
CursorData *c;
c = get_cursor(fcinfo, false);
close_cursor(c);
return (Datum) 0;
}
/*
* Print state of cursor - just for debug purposes
*/
Datum
dbms_sql_debug_cursor(PG_FUNCTION_ARGS)
{
CursorData *c;
ListCell *lc;
c = get_cursor(fcinfo, false);
if (c->assigned)
{
if (c->original_query)
elog(NOTICE, "orig query: \"%s\"", c->original_query);
if (c->parsed_query)
elog(NOTICE, "parsed query: \"%s\"", c->parsed_query);
}
else
elog(NOTICE, "cursor is not assigned");
foreach(lc, c->variables)
{
VariableData *var = (VariableData *) lfirst(lc);
if (var->typoid != InvalidOid)
{
if (!var->isnull)
{
Oid typOutput;
bool isVarlena;
char *str;
getTypeOutputInfo(var->typoid, &typOutput, &isVarlena);
str = OidOutputFunctionCall(typOutput, var->value);
elog(NOTICE, "variable \"%s\" is assigned to \"%s\"", var->refname, str);
}
else
elog(NOTICE, "variable \"%s\" is NULL", var->refname);
}
else
elog(NOTICE, "variable \"%s\" is not assigned", var->refname);
}
foreach(lc, c->columns)
{
ColumnData *col = (ColumnData *) lfirst(lc);
elog(NOTICE, "column definition for position %d is %s",
col->position,
format_type_with_typemod(col->typoid, col->typmod));
}
return (Datum) 0;
}
/*
* Search a variable in cursor's variable list
*/
static VariableData *
get_var(CursorData *c, char *refname, int position, bool append)
{
ListCell *lc;
foreach(lc, c->variables)
{
VariableData *var = (VariableData *) lfirst(lc);
if (strcmp(var->refname, refname) == 0)
return var;
}
if (append)
{
VariableData *nvar;
MemoryContext oldcxt;
oldcxt = MemoryContextSwitchTo(c->cursor_cxt);
nvar = palloc0(sizeof(VariableData));
nvar->refname = pstrdup(refname);
nvar->varno = c->nvariables + 1;
nvar->position = position;
c->variables = lappend(c->variables, nvar);
c->nvariables += 1;
MemoryContextSwitchTo(oldcxt);
return nvar;
}
else
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_PARAMETER),
errmsg("variable \"%s\" doesn't exists", refname)));
/* be msvc quite */
return NULL;
}
/*
* PROCEDURE dbms_sql.parse(c int, stmt varchar)
*/
Datum
dbms_sql_parse(PG_FUNCTION_ARGS)
{
char *query,
*ptr;
char *start;
size_t len;
orafceTokenType typ;
StringInfoData sinfo;
CursorData *c;
MemoryContext oldcxt;
c = get_cursor(fcinfo, true);
if (PG_ARGISNULL(1))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("parsed query string is NULL")));
if (c->parsed_query)
{
int cid = c->cid;
close_cursor(c);
open_cursor(c, cid);
}
query = text_to_cstring(PG_GETARG_TEXT_P(1));
ptr = query;
initStringInfo(&sinfo);
while (ptr)
{
char *startsep;
char *next_ptr;
size_t seplen;
next_ptr = next_token(ptr, &start, &len, &typ, &startsep, &seplen);
if (next_ptr)
{
if (typ == TOKEN_DOLAR_STR)
{
appendStringInfo(&sinfo, "%.*s", (int) seplen, startsep);
appendStringInfo(&sinfo, "%.*s", (int) len, start);
appendStringInfo(&sinfo, "%.*s", (int) seplen, startsep);
}
else if (typ == TOKEN_BIND_VAR)
{
char *name = downcase_identifier(start, (int) len, false, true);
VariableData *var = get_var(c, name, (int) (ptr - query), true);
appendStringInfo(&sinfo, "$%d", var->varno);
pfree(name);
}
else if (typ == TOKEN_EXT_STR)
{
appendStringInfo(&sinfo, "e\'%.*s\'", (int) len, start);
}
else if (typ == TOKEN_STR)
{
appendStringInfo(&sinfo, "\'%.*s\'", (int) len, start);
}
else if (typ == TOKEN_QIDENTIF)
{
appendStringInfo(&sinfo, "\"%.*s\"", (int) len, start);
}
else if (typ != TOKEN_NONE)
{
appendStringInfo(&sinfo, "%.*s", (int) len, start);
}
}
ptr = next_ptr;
}
/* save result to persist context */
oldcxt = MemoryContextSwitchTo(c->cursor_cxt);
c->original_query = pstrdup(query);
c->parsed_query = pstrdup(sinfo.data);
MemoryContextSwitchTo(oldcxt);
pfree(query);
pfree(sinfo.data);
return (Datum) 0;
}
/*
* Calling procedure can be slow, so there is a function alternative
*/
static Datum
bind_variable(PG_FUNCTION_ARGS)
{
CursorData *c;
VariableData *var;
char *varname, *varname_downcase;
Oid valtype;
bool is_unknown = false;
c = get_cursor(fcinfo, true);
if (PG_ARGISNULL(1))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("name of bind variable is NULL")));
varname = text_to_cstring(PG_GETARG_TEXT_P(1));
if (*varname == ':')
varname += 1;
varname_downcase = downcase_identifier(varname, (int) strlen(varname), false, true);
var = get_var(c, varname_downcase, -1, false);
valtype = get_fn_expr_argtype(fcinfo->flinfo, 2);
if (valtype == RECORDOID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot to bind a value of record type")));
valtype = getBaseType(valtype);
if (valtype == UNKNOWNOID)
{
is_unknown = true;
valtype = TEXTOID;
}
if (var->typoid != InvalidOid)
{
if (!var->typbyval && !var->isnull)
{
pfree(DatumGetPointer(var->value));
var->value = (Datum) 0;
}
var->isnull = true;
}
var->typoid = valtype;
if (!PG_ARGISNULL(2))
{
MemoryContext oldcxt;
get_typlenbyval(var->typoid, &var->typlen, &var->typbyval);
oldcxt = MemoryContextSwitchTo(c->cursor_cxt);
if (is_unknown)
var->value = CStringGetTextDatum(DatumGetPointer(PG_GETARG_DATUM(2)));
else
var->value = datumCopy(PG_GETARG_DATUM(2), var->typbyval, var->typlen);
var->isnull = false;
MemoryContextSwitchTo(oldcxt);
}
else
var->isnull = true;
return (Datum) 0;
}
/*
* CREATE PROCEDURE dbms_sql.bind_variable(c int, name varchar2, value "any");
*/
Datum
dbms_sql_bind_variable(PG_FUNCTION_ARGS)
{
return bind_variable(fcinfo);
}
/*
* CREATE FUNCTION dbms_sql.bind_variable_f(c int, name varchar2, value "any") RETURNS void;
*/
Datum
dbms_sql_bind_variable_f(PG_FUNCTION_ARGS)
{
return bind_variable(fcinfo);
}
static void
bind_array(FunctionCallInfo fcinfo, int index1, int index2)
{
CursorData *c;
VariableData *var;
char *varname, *varname_downcase;
Oid valtype;
Oid elementtype;
c = get_cursor(fcinfo, true);
if (PG_ARGISNULL(1))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("name of bind variable is NULL")));
varname = text_to_cstring(PG_GETARG_TEXT_P(1));
if (*varname == ':')
varname += 1;
varname_downcase = downcase_identifier(varname, (int) strlen(varname), false, true);
var = get_var(c, varname_downcase, -1, false);
valtype = get_fn_expr_argtype(fcinfo->flinfo, 2);
if (valtype == RECORDOID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot to bind a value of record type")));
valtype = getBaseType(valtype);
elementtype = get_element_type(valtype);
if (!OidIsValid(elementtype))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("value is not a array")));
if (var->typoid != InvalidOid)
{
if (!var->typbyval && !var->isnull)
{
pfree(DatumGetPointer(var->value));
var->value = (Datum) 0;
}
var->isnull = true;
}
var->is_array = true;
var->typoid = valtype;
var->typelemid = elementtype;
get_typlenbyval(elementtype, &var->typelemlen, &var->typelembyval);
if (!PG_ARGISNULL(2))
{
MemoryContext oldcxt;
get_typlenbyval(var->typoid, &var->typlen, &var->typbyval);
oldcxt = MemoryContextSwitchTo(c->cursor_cxt);
var->value = datumCopy(PG_GETARG_DATUM(2), var->typbyval, var->typlen);
var->isnull = false;
MemoryContextSwitchTo(oldcxt);
}
else
var->isnull = true;
var->index1 = index1;
var->index2 = index2;
}
/*
* CREATE PROCEDURE dbms_sql.bind_array(c int, name varchar2, value anyarray);
*/
Datum
dbms_sql_bind_array_3(PG_FUNCTION_ARGS)
{
bind_array(fcinfo, -1, -1);
return (Datum) 0;
}
/*
* CREATE PROCEDURE dbms_sql.bind_array(c int, name varchar2, value anyarray, index1 int, index2 int);
*/
Datum
dbms_sql_bind_array_5(PG_FUNCTION_ARGS)
{
int index1, index2;
if (PG_ARGISNULL(3) || PG_ARGISNULL(4))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("index is NULL")));
index1 = PG_GETARG_INT32(3);
index2 = PG_GETARG_INT32(4);
if (index1 < 0 || index2 < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("index is below zero")));
if (index1 > index2)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("index1 is greater than index2")));
bind_array(fcinfo, index1, index2);
return (Datum) 0;
}
static ColumnData *
get_col(CursorData *c, int position, bool append)
{
ListCell *lc;
foreach(lc, c->columns)
{
ColumnData *col = (ColumnData *) lfirst(lc);
if (col->position == position)
return col;
}
if (append)
{
ColumnData *ncol;
MemoryContext oldcxt;
oldcxt = MemoryContextSwitchTo(c->cursor_cxt);
ncol = palloc0(sizeof(ColumnData));
ncol->position = position;
if (c->max_colpos < position)
c->max_colpos = position;
c->columns = lappend(c->columns, ncol);
MemoryContextSwitchTo(oldcxt);
return ncol;
}
else
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("column no %d is not defined", position)));
/* be msvc quite */
return NULL;
}
/*
* CREATE PROCEDURE dbms_sql.define_column(c int, col int, value "any", column_size int DEFAULT -1);
*/
Datum
dbms_sql_define_column(PG_FUNCTION_ARGS)
{
CursorData *c;
ColumnData *col;
Oid valtype;
Oid basetype;
int position;
int colsize;
TYPCATEGORY category;
bool ispreferred;
c = get_cursor(fcinfo, true);
if (PG_ARGISNULL(1))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("column position (number) is NULL")));
position = PG_GETARG_INT32(1);
col = get_col(c, position, true);
valtype = get_fn_expr_argtype(fcinfo->flinfo, 2);
if (valtype == RECORDOID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot to define a column of record type")));
if (valtype == UNKNOWNOID)
valtype = TEXTOID;
basetype = getBaseType(valtype);
if (col->typoid != InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column is defined already")));
col->typoid = valtype;
if (PG_ARGISNULL(3))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("column_size is NULL")));
colsize = PG_GETARG_INT32(3);
get_type_category_preferred(basetype, &category, &ispreferred);
col->typisstr = category == TYPCATEGORY_STRING;
col->typmod = (col->typisstr && colsize != -1) ? colsize + 4 : -1;
get_typlenbyval(basetype, &col->typlen, &col->typbyval);
col->rowcount = 1;
return (Datum) 0;
}
/*
* CREATE PROCEDURE dbms_sql.define_array(c int, col int, value "anyarray", rowcount int, index1 int);
*/
Datum
dbms_sql_define_array(PG_FUNCTION_ARGS)
{
CursorData *c;
ColumnData *col;
Oid valtype;
Oid basetype;
int position;
int rowcount;
int index1;
Oid elementtype;
TYPCATEGORY category;
bool ispreferred;
c = get_cursor(fcinfo, true);
if (PG_ARGISNULL(1))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("column position (number) is NULL")));
position = PG_GETARG_INT32(1);
col = get_col(c, position, true);
valtype = get_fn_expr_argtype(fcinfo->flinfo, 2);
if (valtype == RECORDOID)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot to define a column of record type")));
get_type_category_preferred(valtype, &category, &ispreferred);
if (category != TYPCATEGORY_ARRAY)
elog(ERROR, "defined value is not array");
col->typarrayoid = valtype;
basetype = getBaseType(valtype);
elementtype = get_element_type(basetype);
if (!OidIsValid(elementtype))
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("column is not a array")));
if (col->typoid != InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column is defined already")));
col->typoid = elementtype;
if (PG_ARGISNULL(3))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("cnt is NULL")));
rowcount = PG_GETARG_INT32(3);
if (rowcount <= 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cnt is less or equal to zero")));
col->rowcount = (uint64) rowcount;
if (PG_ARGISNULL(4))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("lower_bnd is NULL")));
index1 = PG_GETARG_INT32(4);
if (index1 < 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("lower_bnd is less than one")));
if (index1 != 1)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("lower_bnd can be only only \"1\"")));
col->index1 = index1;
get_typlenbyval(col->typoid, &col->typlen, &col->typbyval);
return (Datum) 0;
}
static void
cursor_xact_cxt_deletion_callback(void *arg)
{
CursorData *cur = (CursorData *) arg;
cur->cursor_xact_cxt = NULL;
cur->result_cxt = NULL;
cur->tuples_cxt = NULL;
cur->processed = 0;
cur->nread = 0;
cur->executed = false;
cur->tupdesc = NULL;
cur->coltupdesc = NULL;
cur->casts = NULL;
cur->array_columns = NULL;
}
static uint64
execute(CursorData *c)
{
last_row_count = 0;
/* clean space with saved result */
if (!c->cursor_xact_cxt)
{
MemoryContextCallback *mcb;
MemoryContext oldcxt;
c->cursor_xact_cxt = AllocSetContextCreate(TopTransactionContext,
"dbms_sql transaction context",
ALLOCSET_DEFAULT_SIZES);
oldcxt = MemoryContextSwitchTo(c->cursor_xact_cxt);
mcb = palloc0(sizeof(MemoryContextCallback));
mcb->func = cursor_xact_cxt_deletion_callback;
mcb->arg = c;
MemoryContextRegisterResetCallback(c->cursor_xact_cxt, mcb);
MemoryContextSwitchTo(oldcxt);
}
else
{
MemoryContext save_cxt = c->cursor_xact_cxt;
MemoryContextReset(c->cursor_xact_cxt);
c->cursor_xact_cxt = save_cxt;
c->casts = NULL;
c->tupdesc = NULL;
c->tuples_cxt = NULL;
}
c->result_cxt = AllocSetContextCreate(c->cursor_xact_cxt,
"dbms_sql short life context",
ALLOCSET_DEFAULT_SIZES);
/*
* When column definitions are available, build final query
* and open cursor for fetching. When column definitions are
* missing, then the statement can be called with high frequency
* etc INSERT, UPDATE, so use cached plan.
*/
if (c->columns)
{
Datum *values;
Oid *types;
char *nulls;
ListCell *lc;
int i;
MemoryContext oldcxt;
uint64 batch_rows = 0;
oldcxt = MemoryContextSwitchTo(c->cursor_xact_cxt);
/* prepare query arguments */
values = palloc(sizeof(Datum) * c->nvariables);
types = palloc(sizeof(Oid) * c->nvariables);
nulls = palloc(sizeof(char) * c->nvariables);
i = 0;
foreach(lc, c->variables)
{
VariableData *var = (VariableData *) lfirst(lc);
if (var->is_array)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("a array (bulk) variable can be used only when no column is defined")));
if (!var->isnull)
{
/* copy a value to xact memory context, to be independent on a outside */
values[i] = datumCopy(var->value, var->typbyval, var->typlen);
nulls[i] = ' ';
}
else
nulls[i] = 'n';
if (var->typoid == InvalidOid)
ereport(ERROR,