1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/*!
\file db/driver/postgres/execute.c
\brief DBMI - Low Level PostgreSQL database driver - execute statements
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 <grass/dbmi.h>
#include <grass/gis.h>
#include <grass/glocale.h>
#include "globals.h"
#include "proto.h"
int db__driver_execute_immediate(dbString *sql)
{
PGresult *res;
char *str;
/* Postgres supports in addition to standard escape character '
* (apostrophe) also \ (basckslash) as this is not SQL standard,
* GRASS modules cannot work escape all \ in the text because
* other drivers do not support this feature. For example, if a
* text contains string \' GRASS modules escape ' by another ' and
* string passed to driver is \'' postgres takes \' as ' but
* second ' remains not escaped, result is error. Because of
* this, all occurrences of \ in sql are escaped by \ */
str = G_str_replace(db_get_string(sql), "\\", "\\\\");
G_debug(3, "db__driver_execute_immediate(): Escaped SQL: '%s'", str);
res = PQexec(pg_conn, str);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK) {
db_d_append_error("%s\n%s\n%s", _("Unable to execute:"), str,
PQerrorMessage(pg_conn));
db_d_report_error();
PQclear(res);
if (str)
G_free(str);
return DB_FAILED;
}
if (str)
G_free(str);
PQclear(res);
return DB_OK;
}
int db__driver_begin_transaction(void)
{
PGresult *res;
G_debug(2, "pg : BEGIN");
res = PQexec(pg_conn, "BEGIN");
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK) {
db_d_append_error(_("Unable to 'BEGIN' transaction"));
db_d_report_error();
PQclear(res);
return DB_FAILED;
}
PQclear(res);
return DB_OK;
}
int db__driver_commit_transaction(void)
{
PGresult *res;
G_debug(2, "pg : COMMIT");
res = PQexec(pg_conn, "COMMIT");
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK) {
db_d_append_error(_("Unable to 'COMMIT' transaction"));
db_d_report_error();
PQclear(res);
return DB_FAILED;
}
PQclear(res);
return DB_OK;
}
|
