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/*!
\file db/driver/postgres/fetch.c
\brief DBMI - Low Level PostgreSQL database driver - fetch data
\todo implement time zone handling
This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.
\author Radim Blazek
*/
#include <stdlib.h>
#include <string.h>
#include <grass/dbmi.h>
#include <grass/glocale.h>
#include "globals.h"
#include "proto.h"
int db__driver_fetch(dbCursor *cn, int position, int *more)
{
cursor *c;
dbToken token;
dbTable *table;
int i;
/* get cursor token */
token = db_get_cursor_token(cn);
/* get the cursor by its token */
if (!(c = (cursor *)db_find_token(token))) {
db_d_append_error(_("Cursor not found"));
db_d_report_error();
return DB_FAILED;
}
/* fetch on position */
switch (position) {
case DB_NEXT:
c->row++;
break;
case DB_CURRENT:
break;
case DB_PREVIOUS:
c->row--;
break;
case DB_FIRST:
c->row = 0;
break;
case DB_LAST:
c->row = c->nrows - 1;
break;
};
G_debug(3, "row = %d nrows = %d", c->row, c->nrows);
if (c->row < 0 || c->row >= c->nrows) {
*more = 0;
return DB_OK;
}
*more = 1;
/* get the data out of the descriptor into the table */
table = db_get_cursor_table(cn);
for (i = 0; i < c->ncols; i++) {
int col, gpgtype, sqltype;
dbColumn *column;
dbValue *value;
col = c->cols[i]; /* known cols */
column = db_get_table_column(table, i);
gpgtype = db_get_column_host_type(column);
sqltype = db_get_column_sqltype(column);
value = db_get_column_value(column);
db_zero_string(&value->s);
/* Is null? */
if (PQgetisnull(c->res, c->row, col)) {
value->isNull = 1;
continue;
}
else {
value->isNull = 0;
}
G_debug(3, "row %d, col %d, gpgtype %d, sqltype %d: val = '%s'", c->row,
col, gpgtype, sqltype, PQgetvalue(c->res, c->row, col));
switch (gpgtype) {
int ns, tz;
case PG_TYPE_CHAR:
case PG_TYPE_BPCHAR:
case PG_TYPE_VARCHAR:
case PG_TYPE_TEXT:
db_set_string(&(value->s), PQgetvalue(c->res, c->row, col));
break;
case PG_TYPE_BIT:
case PG_TYPE_INT2:
case PG_TYPE_INT4:
case PG_TYPE_INT8:
case PG_TYPE_SERIAL:
case PG_TYPE_OID:
value->i = atoi(PQgetvalue(c->res, c->row, col));
break;
case PG_TYPE_FLOAT4:
case PG_TYPE_FLOAT8:
case PG_TYPE_NUMERIC:
value->d = atof(PQgetvalue(c->res, c->row, col));
break;
/* Note: we have set DATESTYLE TO ISO in
* db_driver_open_select_cursor() so datetime format should be ISO
*/
case PG_TYPE_DATE:
/* Example: '1999-01-25' */
ns = sscanf(PQgetvalue(c->res, c->row, col), "%4d-%2d-%2d",
&(value->t.year), &(value->t.month), &(value->t.day));
if (ns != 3) {
db_d_append_error("%s %s", _("Unable to scan date:"),
PQgetvalue(c->res, c->row, col));
db_d_report_error();
return DB_FAILED;
}
value->t.hour = 0;
value->t.minute = 0;
value->t.seconds = 0.0;
break;
case PG_TYPE_TIME:
/* Example: '04:05:06.25', '04:05:06' */
ns = sscanf(PQgetvalue(c->res, c->row, col), "%2d:%2d:%lf",
&(value->t.hour), &(value->t.minute),
&(value->t.seconds));
if (ns != 3) {
db_d_append_error("%s %s", _("Unable to scan time:"),
PQgetvalue(c->res, c->row, col));
db_d_report_error();
return DB_FAILED;
}
value->t.year = 0;
value->t.month = 0;
value->t.day = 0;
break;
case PG_TYPE_TIMESTAMP:
/* Example: '1999-01-25 04:05:06.25+01', '1999-01-25 04:05:06' */
ns = sscanf(PQgetvalue(c->res, c->row, col),
"%4d-%2d-%2d %2d:%2d:%lf%3d", &(value->t.year),
&(value->t.month), &(value->t.day), &(value->t.hour),
&(value->t.minute), &(value->t.seconds), &tz);
if (ns == 7) {
db_d_append_error("%s %s",
_("Unable to scan timestamp "
"(no idea how to process time zone):"),
PQgetvalue(c->res, c->row, col));
db_d_report_error();
return DB_FAILED;
}
else if (ns < 6) {
db_d_append_error("%s %s",
_("Unable to scan timestamp "
"(not enough arguments):"),
PQgetvalue(c->res, c->row, col));
db_d_report_error();
return DB_FAILED;
}
break;
case PG_TYPE_BOOL:
if (strcmp(PQgetvalue(c->res, c->row, col), "t") == 0)
db_set_string(&(value->s), "1");
else if (strcmp(PQgetvalue(c->res, c->row, col), "f") == 0)
db_set_string(&(value->s), "0");
else
G_warning(_("Unable to recognize boolean value"));
break;
}
}
G_debug(3, "Row fetched");
return DB_OK;
}
int db__driver_get_num_rows(dbCursor *cn)
{
cursor *c;
dbToken token;
/* get cursor token */
token = db_get_cursor_token(cn);
/* get the cursor by its token */
if (!(c = (cursor *)db_find_token(token))) {
db_d_append_error(_("Taken not found"));
db_d_report_error();
return DB_FAILED;
}
return (c->nrows);
}
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