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qresult.c
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qresult.c
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/*---------
* Module: qresult.c
*
* Description: This module contains functions related to
* managing result information (i.e, fetching rows
* from the backend, managing the tuple cache, etc.)
* and retrieving it. Depending on the situation, a
* QResultClass will hold either data from the backend
* or a manually built result.
*
* Classes: QResultClass (Functions prefix: "QR_")
*
* API functions: none
*
* Comments: See "readme.txt" for copyright and license information.
*---------
*/
#include "qresult.h"
#include "statement.h"
#include <libpq-fe.h>
#include "misc.h"
#include <stdio.h>
#include <string.h>
#include <limits.h>
static BOOL QR_prepare_for_tupledata(QResultClass *self);
static BOOL QR_read_tuples_from_pgres(QResultClass *, PGresult **pgres);
/*
* Used for building a Manual Result only
* All info functions call this function to create the manual result set.
*/
void
QR_set_num_fields(QResultClass *self, int new_num_fields)
{
if (!self) return;
MYLOG(0, "entering\n");
CI_set_num_fields(QR_get_fields(self), new_num_fields);
MYLOG(0, "leaving\n");
}
void
QR_set_position(QResultClass *self, SQLLEN pos)
{
self->tupleField = self->backend_tuples + ((QR_get_rowstart_in_cache(self) + pos) * self->num_fields);
}
void
QR_set_cache_size(QResultClass *self, SQLLEN cache_size)
{
self->cache_size = cache_size;
}
void
QR_set_reqsize(QResultClass *self, Int4 reqsize)
{
self->rowset_size_include_ommitted = reqsize;
}
void
QR_set_cursor(QResultClass *self, const char *name)
{
ConnectionClass *conn = QR_get_conn(self);
if (self->cursor_name)
{
if (name &&
0 == strcmp(name, self->cursor_name))
return;
free(self->cursor_name);
if (conn)
{
CONNLOCK_ACQUIRE(conn);
conn->ncursors--;
CONNLOCK_RELEASE(conn);
}
self->cursTuple = -1;
QR_set_no_cursor(self);
}
else if (NULL == name)
return;
if (name)
{
self->cursor_name = strdup(name);
if (conn)
{
CONNLOCK_ACQUIRE(conn);
conn->ncursors++;
CONNLOCK_RELEASE(conn);
}
}
else
{
self->cursor_name = NULL;
/*
* The isSqlServr() check below was added because the code was freeing
* cursors prematurely when other results with open cursors exist. The
* code was originally added for a scenario using SQL Server linked
* servers in commit c07342d22d82ea6293d27057840babfc2ff6d750.
*/
if (isSqlServr())
{
QResultClass *res;
for (res = QR_nextr(self); NULL != res; res = QR_nextr(res))
{
if (NULL != res->cursor_name)
free(res->cursor_name);
res->cursor_name = NULL;
}
}
}
}
void
QR_set_num_cached_rows(QResultClass *self, SQLLEN num_rows)
{
self->num_cached_rows = num_rows;
if (QR_synchronize_keys(self))
self->num_cached_keys = self->num_cached_rows;
}
void
QR_set_rowstart_in_cache(QResultClass *self, SQLLEN start)
{
if (QR_synchronize_keys(self))
self->key_base = start;
self->base = start;
}
void
QR_inc_rowstart_in_cache(QResultClass *self, SQLLEN base_inc)
{
if (!QR_has_valid_base(self))
MYLOG(0, " called while the cache is not ready\n");
self->base += base_inc;
if (QR_synchronize_keys(self))
self->key_base = self->base;
}
void
QR_set_fields(QResultClass *self, ColumnInfoClass *fields)
{
ColumnInfoClass *curfields = QR_get_fields(self);
if (curfields == fields)
return;
/*
* Unlink the old columninfo from this result set, freeing it if this
* was the last reference.
*/
if (NULL != curfields)
{
if (curfields->refcount > 1)
curfields->refcount--;
else
CI_Destructor(curfields);
}
self->fields = fields;
if (NULL != fields)
fields->refcount++;
}
/*
* CLASS QResult
*/
QResultClass *
QR_Constructor(void)
{
QResultClass *rv;
MYLOG(0, "entering\n");
rv = (QResultClass *) malloc(sizeof(QResultClass));
if (rv != NULL)
{
ColumnInfoClass *fields;
rv->rstatus = PORES_EMPTY_QUERY;
rv->pstatus = 0;
/* construct the column info */
rv->fields = NULL;
if (fields = CI_Constructor(), NULL == fields)
{
free(rv);
return NULL;
}
QR_set_fields(rv, fields);
rv->backend_tuples = NULL;
rv->sqlstate[0] = '\0';
rv->message = NULL;
rv->messageref = NULL;
rv->command = NULL;
rv->notice = NULL;
rv->conn = NULL;
QR_nextr(rv) = NULL;
rv->count_backend_allocated = 0;
rv->count_keyset_allocated = 0;
rv->num_total_read = 0;
rv->num_cached_rows = 0;
rv->num_cached_keys = 0;
rv->fetch_number = 0;
rv->flags = 0; /* must be cleared before calling QR_set_rowstart_in_cache() */
QR_set_rowstart_in_cache(rv, -1);
rv->key_base = -1;
rv->recent_processed_row_count = -1;
rv->cursTuple = -1;
rv->move_offset = 0;
rv->num_fields = 0;
rv->num_key_fields = PG_NUM_NORMAL_KEYS; /* CTID + OID */
rv->tupleField = NULL;
rv->cursor_name = NULL;
rv->aborted = FALSE;
rv->cache_size = 0;
rv->cmd_fetch_size = 0;
rv->rowset_size_include_ommitted = 1;
rv->move_direction = 0;
rv->keyset = NULL;
rv->reload_count = 0;
rv->rb_alloc = 0;
rv->rb_count = 0;
rv->dataFilled = FALSE;
rv->rollback = NULL;
rv->ad_alloc = 0;
rv->ad_count = 0;
rv->added_keyset = NULL;
rv->added_tuples = NULL;
rv->up_alloc = 0;
rv->up_count = 0;
rv->updated = NULL;
rv->updated_keyset = NULL;
rv->updated_tuples = NULL;
rv->dl_alloc = 0;
rv->dl_count = 0;
rv->deleted = NULL;
rv->deleted_keyset = NULL;
}
MYLOG(0, "leaving %p\n", rv);
return rv;
}
void
QR_close_result(QResultClass *self, BOOL destroy)
{
ConnectionClass *conn;
QResultClass *next;
BOOL top = TRUE;
if (!self) return;
MYLOG(0, "entering\n");
while(self)
{
/*
* If conn is defined, then we may have used "backend_tuples", so in
* case we need to, free it up. Also, close the cursor.
*/
if ((conn = QR_get_conn(self)) && conn->pqconn)
{
if (CC_is_in_trans(conn) || QR_is_withhold(self))
{
if (!QR_close(self)) /* close the cursor if there is one */
{
}
}
}
QR_free_memory(self); /* safe to call anyway */
/*
* Should have been freed in the close() but just in case...
* QR_set_cursor clears the cursor name of all the chained results too,
* so we only need to do this for the first result in the chain.
*/
if (top)
QR_set_cursor(self, NULL);
/* Free up column info */
if (destroy)
QR_set_fields(self, NULL);
/* Free command info (this is from strdup()) */
if (self->command)
{
free(self->command);
self->command = NULL;
}
/* Free message info (this is from strdup()) */
if (self->message)
{
free(self->message);
self->message = NULL;
}
/* Free notice info (this is from strdup()) */
if (self->notice)
{
free(self->notice);
self->notice = NULL;
}
/* Destruct the result object in the chain */
next = QR_nextr(self);
QR_detach(self);
if (destroy)
free(self);
/* Repeat for the next result in the chain */
self = next;
destroy = TRUE; /* always destroy chained results */
top = FALSE;
}
MYLOG(0, "leaving\n");
}
void
QR_reset_for_re_execute(QResultClass *self)
{
MYLOG(0, "entering for %p\n", self);
if (!self) return;
QR_close_result(self, FALSE);
/* reset flags etc */
self->flags = 0;
QR_set_rowstart_in_cache(self, -1);
self->recent_processed_row_count = -1;
/* clear error info etc */
self->rstatus = PORES_EMPTY_QUERY;
self->aborted = FALSE;
self->sqlstate[0] = '\0';
self->messageref = NULL;
MYLOG(0, "leaving\n");
}
void
QR_Destructor(QResultClass *self)
{
MYLOG(0, "entering\n");
if (!self) return;
QR_close_result(self, TRUE);
MYLOG(0, "leaving\n");
}
void
QR_set_command(QResultClass *self, const char *msg)
{
if (self->command)
free(self->command);
self->command = msg ? strdup(msg) : NULL;
}
void
QR_set_message(QResultClass *self, const char *msg)
{
if (self->message)
free(self->message);
self->messageref = NULL;
self->message = msg ? strdup(msg) : NULL;
}
void
QR_add_message(QResultClass *self, const char *msg)
{
char *message = self->message;
size_t alsize, pos, addlen;
if (!msg || !msg[0])
return;
addlen = strlen(msg);
if (message)
{
pos = strlen(message) + 1;
alsize = pos + addlen + 1;
}
else
{
pos = 0;
alsize = addlen + 1;
}
if (message = realloc(message, alsize), NULL == message)
return;
if (pos > 0)
message[pos - 1] = ';';
strncpy_null(message + pos, msg, addlen + 1);
self->message = message;
}
void
QR_set_notice(QResultClass *self, const char *msg)
{
if (self->notice)
free(self->notice);
self->notice = msg ? strdup(msg) : NULL;
}
void
QR_add_notice(QResultClass *self, const char *msg)
{
char *message = self->notice;
size_t alsize, pos, addlen;
if (!msg || !msg[0])
return;
addlen = strlen(msg);
if (message)
{
pos = strlen(message) + 1;
alsize = pos + addlen + 1;
}
else
{
pos = 0;
alsize = addlen + 1;
}
if (message = realloc(message, alsize), NULL == message)
return;
if (pos > 0)
message[pos - 1] = ';';
strncpy_null(message + pos, msg, addlen + 1);
self->notice = message;
}
TupleField *QR_AddNew(QResultClass *self)
{
size_t alloc;
UInt4 num_fields;
if (!self) return NULL;
MYLOG(DETAIL_LOG_LEVEL, FORMAT_ULEN "th row(%d fields) alloc=" FORMAT_LEN "\n", self->num_cached_rows, QR_NumResultCols(self), self->count_backend_allocated);
if (num_fields = QR_NumResultCols(self), !num_fields) return NULL;
if (self->num_fields <= 0)
{
self->num_fields = num_fields;
QR_set_reached_eof(self);
}
alloc = self->count_backend_allocated;
if (!self->backend_tuples)
{
self->num_cached_rows = 0;
alloc = TUPLE_MALLOC_INC;
QR_MALLOC_return_with_error(self->backend_tuples, TupleField, alloc * sizeof(TupleField) * num_fields, self, "Out of memory in QR_AddNew.", NULL);
}
else if (self->num_cached_rows >= self->count_backend_allocated)
{
alloc = self->count_backend_allocated * 2;
QR_REALLOC_return_with_error(self->backend_tuples, TupleField, alloc * sizeof(TupleField) * num_fields, self, "Out of memory in QR_AddNew.", NULL);
}
self->count_backend_allocated = alloc;
if (self->backend_tuples)
{
memset(self->backend_tuples + num_fields * self->num_cached_rows, 0, num_fields * sizeof(TupleField));
self->num_cached_rows++;
self->ad_count++;
}
return self->backend_tuples + num_fields * (self->num_cached_rows - 1);
}
void
QR_free_memory(QResultClass *self)
{
SQLLEN num_backend_rows = self->num_cached_rows;
int num_fields = self->num_fields;
MYLOG(0, "entering fcount=" FORMAT_LEN "\n", num_backend_rows);
if (self->backend_tuples)
{
ClearCachedRows(self->backend_tuples, num_fields, num_backend_rows);
free(self->backend_tuples);
self->count_backend_allocated = 0;
self->backend_tuples = NULL;
self->dataFilled = FALSE;
self->tupleField = NULL;
}
if (self->keyset)
{
ConnectionClass *conn = QR_get_conn(self);
free(self->keyset);
self->keyset = NULL;
self->count_keyset_allocated = 0;
if (self->reload_count > 0 && conn && conn->pqconn)
{
char plannm[32];
SPRINTF_FIXED(plannm, "_KEYSET_%p", self);
if (CC_is_in_error_trans(conn))
{
CC_mark_a_object_to_discard(conn, 's',plannm);
}
else
{
QResultClass *res;
char cmd[64];
SPRINTF_FIXED(cmd, "DEALLOCATE \"%s\"", plannm);
res = CC_send_query(conn, cmd, NULL, IGNORE_ABORT_ON_CONN | ROLLBACK_ON_ERROR, NULL);
QR_Destructor(res);
}
}
self->reload_count = 0;
}
if (self->rollback)
{
free(self->rollback);
self->rb_alloc = 0;
self->rb_count = 0;
self->rollback = NULL;
}
if (self->deleted)
{
free(self->deleted);
self->deleted = NULL;
}
if (self->deleted_keyset)
{
free(self->deleted_keyset);
self->deleted_keyset = NULL;
}
self->dl_alloc = 0;
self->dl_count = 0;
/* clear added info */
if (self->added_keyset)
{
free(self->added_keyset);
self->added_keyset = NULL;
}
if (self->added_tuples)
{
ClearCachedRows(self->added_tuples, num_fields, self->ad_count);
free(self->added_tuples);
self->added_tuples = NULL;
}
self->ad_alloc = 0;
self->ad_count = 0;
/* clear updated info */
if (self->updated)
{
free(self->updated);
self->updated = NULL;
}
if (self->updated_keyset)
{
free(self->updated_keyset);
self->updated_keyset = NULL;
}
if (self->updated_tuples)
{
ClearCachedRows(self->updated_tuples, num_fields, self->up_count);
free(self->updated_tuples);
self->updated_tuples = NULL;
}
self->up_alloc = 0;
self->up_count = 0;
self->num_total_read = 0;
self->num_cached_rows = 0;
self->num_cached_keys = 0;
self->cursTuple = -1;
self->pstatus = 0;
MYLOG(0, "leaving\n");
}
BOOL
QR_from_PGresult(QResultClass *self, StatementClass *stmt, ConnectionClass *conn, const char *cursor, PGresult **pgres)
{
int num_io_params, num_cached_rows;
int i;
Int2 paramType;
IPDFields *ipdopts;
Int2 lf;
int new_num_fields;
OID new_adtid, new_relid = 0, new_attid = 0;
Int2 new_adtsize;
Int4 new_atttypmod = -1;
char *new_field_name;
Int2 dummy1, dummy2;
int cidx;
BOOL reached_eof_now = FALSE;
if (NULL != conn)
/* First, get column information */
QR_set_conn(self, conn);
/* at first read in the number of fields that are in the query */
new_num_fields = PQnfields(*pgres);
QLOG(0, "\tnFields: %d\n", new_num_fields);
/* according to that allocate memory */
QR_set_num_fields(self, new_num_fields);
if (NULL == QR_get_fields(self)->coli_array)
return FALSE;
/* now read in the descriptions */
for (lf = 0; lf < new_num_fields; lf++)
{
new_field_name = PQfname(*pgres, lf);
new_relid = PQftable(*pgres, lf);
new_attid = PQftablecol(*pgres, lf);
new_adtid = (OID) PQftype(*pgres, lf);
new_adtsize = (Int2) PQfsize(*pgres, lf);
new_atttypmod = (Int4) PQfmod(*pgres, lf);
/* Subtract the header length */
switch (new_adtid)
{
case PG_TYPE_DATETIME:
case PG_TYPE_TIMESTAMP_NO_TMZONE:
case PG_TYPE_TIME:
case PG_TYPE_TIME_WITH_TMZONE:
break;
default:
new_atttypmod -= 4;
}
if (new_atttypmod < 0)
new_atttypmod = -1;
QLOG(0, "\tfieldname='%s', adtid=%d, adtsize=%d, atttypmod=%d (rel,att)=(%d,%d)\n", new_field_name, new_adtid, new_adtsize, new_atttypmod, new_relid, new_attid);
CI_set_field_info(QR_get_fields(self), lf, new_field_name, new_adtid, new_adtsize, new_atttypmod, new_relid, new_attid);
QR_set_rstatus(self, PORES_FIELDS_OK);
self->num_fields = CI_get_num_fields(QR_get_fields(self));
if (QR_haskeyset(self))
self->num_fields -= self->num_key_fields;
if (stmt && conn)
{
num_io_params = CountParameters(stmt, NULL, &dummy1, &dummy2);
if (stmt->proc_return > 0 ||
num_io_params > 0)
{
ipdopts = SC_get_IPDF(stmt);
extend_iparameter_bindings(ipdopts, stmt->num_params);
for (i = 0, cidx = 0; i < stmt->num_params; i++)
{
if (i < stmt->proc_return)
ipdopts->parameters[i].paramType = SQL_PARAM_OUTPUT;
paramType =ipdopts->parameters[i].paramType;
if (SQL_PARAM_OUTPUT == paramType ||
SQL_PARAM_INPUT_OUTPUT == paramType)
{
MYLOG(DETAIL_LOG_LEVEL, "[%d].PGType %u->%u\n", i, PIC_get_pgtype(ipdopts->parameters[i]), CI_get_oid(QR_get_fields(self), cidx));
PIC_set_pgtype(ipdopts->parameters[i], CI_get_oid(QR_get_fields(self), cidx));
cidx++;
}
}
}
}
}
/* Then, get the data itself */
num_cached_rows = self->num_cached_rows;
if (!QR_read_tuples_from_pgres(self, pgres))
return FALSE;
MYLOG(DETAIL_LOG_LEVEL, "!!%p->cursTup=" FORMAT_LEN " total_read=" FORMAT_ULEN "\n", self, self->cursTuple, self->num_total_read);
if (!QR_once_reached_eof(self) && self->cursTuple >= (Int4) self->num_total_read)
self->num_total_read = self->cursTuple + 1;
/* EOF is 'fetched < fetch requested' */
if (self->num_cached_rows - num_cached_rows < self->cmd_fetch_size)
{
MYLOG(0, "detect EOF " FORMAT_ULEN " - %d < " FORMAT_ULEN "\n", self->num_cached_rows, num_cached_rows, self->cmd_fetch_size);
reached_eof_now = TRUE;
QR_set_reached_eof(self);
}
if (reached_eof_now && self->cursTuple < (Int4) self->num_total_read)
self->cursTuple = self->num_total_read;
if (NULL != conn)
{
/* Force a read to occur in next_tuple */
QR_set_next_in_cache(self, (SQLLEN) 0);
QR_set_rowstart_in_cache(self, 0);
self->key_base = 0;
}
/*
* Also fill in command tag. (Typically, it's SELECT, but can also be
* a FETCH.)
*/
QR_set_command(self, PQcmdStatus(*pgres));
QR_set_cursor(self, cursor);
if (NULL == cursor)
QR_set_reached_eof(self);
return TRUE;
}
/*
* Procedure needed when closing cursors.
*/
void
QR_on_close_cursor(QResultClass *self)
{
QR_set_cursor(self, NULL);
}
/*
* Close the cursor and end the transaction (if no cursors left)
* We only close the cursor if other cursors are used.
*/
int
QR_close(QResultClass *self)
{
ConnectionClass *conn;
QResultClass *res;
int ret = TRUE;
conn = QR_get_conn(self);
if (self && QR_get_cursor(self))
{
if (CC_is_in_error_trans(conn))
{
if (QR_is_withhold(self))
CC_mark_a_object_to_discard(conn, 'p', QR_get_cursor(self));
}
else
{
BOOL does_commit = FALSE;
unsigned int flag = 0;
char buf[64];
flag = READ_ONLY_QUERY;
if (QR_needs_survival_check(self))
flag |= (ROLLBACK_ON_ERROR | IGNORE_ABORT_ON_CONN);
SPRINTF_FIXED(buf, "close \"%s\"", QR_get_cursor(self));
/* End the transaction if there are no cursors left on this conn */
if (CC_is_in_trans(conn) &&
CC_does_autocommit(conn) &&
CC_cursor_count(conn) <= 1)
{
MYLOG(0, "End transaction on conn=%p\n", conn);
if ((ROLLBACK_ON_ERROR & flag) == 0)
{
STRCAT_FIXED(buf, ";commit");
flag |= END_WITH_COMMIT;
QR_set_cursor(self, NULL);
}
else
does_commit = TRUE;
}
MYLOG(DETAIL_LOG_LEVEL, " Case I CC_send_query %s flag=%x\n", buf, flag);
res = CC_send_query(conn, buf, NULL, flag, NULL);
QR_Destructor(res);
if (does_commit)
{
if (!CC_commit(conn))
{
QR_set_rstatus(self, PORES_FATAL_ERROR);
QR_set_message(self, "Error ending transaction on autocommit.");
ret = FALSE;
}
}
}
QR_on_close_cursor(self);
if (!ret)
return ret;
#ifdef NOT_USED
/* End the transaction if there are no cursors left on this conn */
if (CC_does_autocommit(conn) && CC_cursor_count(conn) == 0)
{
MYLOG(0, "End transaction on conn=%p\n", conn);
if (!CC_commit(conn))
{
QR_set_rstatus(self, PORES_FATAL_ERROR);
QR_set_message(self, "Error ending transaction.");
ret = FALSE;
}
}
#endif /* NOT_USED */
}
return ret;
}
/*
* Allocate memory for receiving next tuple.
*/
static BOOL
QR_prepare_for_tupledata(QResultClass *self)
{
BOOL haskeyset = QR_haskeyset(self);
SQLULEN num_total_rows = QR_get_num_total_tuples(self);
MYLOG(DETAIL_LOG_LEVEL, "entering %p->num_fields=%d\n", self, self->num_fields);
if (!QR_get_cursor(self))
{
if (self->num_fields > 0 &&
num_total_rows >= self->count_backend_allocated)
{
SQLLEN tuple_size = self->count_backend_allocated;
MYLOG(0, "REALLOC: old_count = " FORMAT_LEN ", size = " FORMAT_SIZE_T "\n", tuple_size, (size_t) (self->num_fields * sizeof(TupleField) * tuple_size));
if (tuple_size < 1)
tuple_size = TUPLE_MALLOC_INC;
else
tuple_size *= 2;
QR_REALLOC_return_with_error(self->backend_tuples, TupleField, tuple_size * self->num_fields * sizeof(TupleField), self, "Out of memory while reading tuples.", FALSE);
self->count_backend_allocated = tuple_size;
}
if (haskeyset &&
self->num_cached_keys >= self->count_keyset_allocated)
{
SQLLEN tuple_size = self->count_keyset_allocated;
if (tuple_size < 1)
tuple_size = TUPLE_MALLOC_INC;
else
tuple_size *= 2;
QR_REALLOC_return_with_error(self->keyset, KeySet, sizeof(KeySet) * tuple_size, self, "Out of mwmory while allocating keyset", FALSE);
memset(&self->keyset[self->count_keyset_allocated],
0,
(tuple_size - self->count_keyset_allocated) * sizeof(KeySet));
self->count_keyset_allocated = tuple_size;
}
}
return TRUE;
}
static SQLLEN enlargeKeyCache(QResultClass *self, SQLLEN add_size, const char *message)
{
size_t alloc, alloc_req;
Int4 num_fields = self->num_fields;
BOOL curs = (NULL != QR_get_cursor(self));
if (add_size <= 0)
return self->count_keyset_allocated;
alloc = self->count_backend_allocated;
if (num_fields > 0 && ((alloc_req = (Int4)self->num_cached_rows + add_size) > alloc || !self->backend_tuples))
{
if (1 > alloc)
{
if (curs)
alloc = alloc_req;
else
alloc = (alloc_req > TUPLE_MALLOC_INC ? alloc_req : TUPLE_MALLOC_INC);
}
else
{
do
{
alloc *= 2;
} while (alloc < alloc_req);
}
self->count_backend_allocated = 0;
QR_REALLOC_return_with_error(self->backend_tuples, TupleField, num_fields * sizeof(TupleField) * alloc, self, message, -1);
self->count_backend_allocated = alloc;
}
alloc = self->count_keyset_allocated;
if (QR_haskeyset(self) && ((alloc_req = (Int4)self->num_cached_keys + add_size) > alloc || !self->keyset))
{
if (1 > alloc)
{
if (curs)
alloc = alloc_req;
else
alloc = (alloc_req > TUPLE_MALLOC_INC ? alloc_req : TUPLE_MALLOC_INC);
}
else
{
do
{
alloc *= 2;
} while (alloc < alloc_req);
}
self->count_keyset_allocated = 0;
QR_REALLOC_return_with_error(self->keyset, KeySet, sizeof(KeySet) * alloc, self, message, -1);
self->count_keyset_allocated = alloc;
}
return alloc;
}
SQLLEN QR_move_cursor_to_last(QResultClass *self, StatementClass *stmt)
{
char movecmd[64];
QResultClass *res;
SQLLEN moved;
ConnectionClass *conn = SC_get_conn(stmt);
if (!QR_get_cursor(self))
return 0;
if (QR_once_reached_eof(self) &&
self->cursTuple >= self->num_total_read)
return 0;
SPRINTF_FIXED(movecmd,
"move all in \"%s\"", QR_get_cursor(self));
res = CC_send_query(conn, movecmd, NULL, READ_ONLY_QUERY, stmt);
if (!QR_command_maybe_successful(res))
{
QR_Destructor(res);
SC_set_error(stmt, STMT_EXEC_ERROR, "move error occurred", __FUNCTION__);
return (-1);
}
moved = (-1);
if (sscanf(res->command, "MOVE " FORMAT_ULEN, &moved) > 0)
{
moved++;
self->cursTuple += moved;
if (!QR_once_reached_eof(self))
{
self->num_total_read = self->cursTuple;
QR_set_reached_eof(self);
}
}
QR_Destructor(res);
return moved;
}
/* This function is called by fetch_tuples() AND SQLFetch() */
int
QR_next_tuple(QResultClass *self, StatementClass *stmt)
{
CSTR func = "QR_next_tuple";
int ret = TRUE;
/* Speed up access */
SQLLEN fetch_number = self->fetch_number, cur_fetch = 0;
SQLLEN num_total_rows;
SQLLEN num_backend_rows = self->num_cached_rows, num_rows_in;
Int4 num_fields = self->num_fields, fetch_size, req_size;
SQLLEN offset = 0, end_tuple;
char boundary_adjusted = FALSE;
TupleField *the_tuples = self->backend_tuples;
QResultClass *res;
/* QR_set_command() dups this string so doesn't need static */
char fetch[128];
QueryInfo qi;
ConnectionClass *conn;
ConnInfo *ci;
BOOL reached_eof_now = FALSE, curr_eof; /* detecting EOF is pretty important */
MYLOG(DETAIL_LOG_LEVEL, "Oh %p->fetch_number=" FORMAT_LEN "\n", self, self->fetch_number);
MYLOG(DETAIL_LOG_LEVEL, "in total_read=" FORMAT_ULEN " cursT=" FORMAT_LEN " currT=" FORMAT_LEN " ad=%d total=" FORMAT_ULEN " rowsetSize=%d\n", self->num_total_read, self->cursTuple, stmt->currTuple, self->ad_count, QR_get_num_total_tuples(self), self->rowset_size_include_ommitted);
num_total_rows = QR_get_num_total_tuples(self);
conn = QR_get_conn(self);
curr_eof = FALSE;
req_size = QR_get_reqsize(self);
/* Determine the optimum cache size. */
ci = &(conn->connInfo);
fetch_size = ci->drivers.fetch_max;
if ((Int4)req_size > fetch_size)
fetch_size = req_size;
if (QR_once_reached_eof(self) && self->cursTuple >= (Int4) QR_get_num_total_read(self))
curr_eof = TRUE;
#define return DONT_CALL_RETURN_FROM_HERE???
#define RETURN(code) { ret = code; goto cleanup;}
ENTER_CONN_CS(conn);
if (0 != self->move_offset)
{
char movecmd[256];
QResultClass *mres = NULL;
SQLULEN movement, moved;
movement = self->move_offset;
if (QR_is_moving_backward(self))
{
if (fetch_size > req_size)
{
SQLLEN incr_move = fetch_size - (req_size < 0 ? 1 : req_size);
movement += incr_move;
if (movement > (UInt4)(self->cursTuple + 1))
movement = self->cursTuple + 1;