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
|
#include <stdlib.h>
#include <dbmi.h>
#include "globals.h"
#include "proto.h"
int db__driver_execute_immediate(sql)
dbString *sql;
{
PGresult *res;
char *str;
init_error();
/* 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 occurencies of \ in sql are escaped by \ */
str = G_str_replace ( db_get_string(sql), "\\", "\\\\" );
G_debug ( 3, "Escaped SQL: %s", str );
res = PQexec(pg_conn, str );
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK) {
append_error( "Cannot execute: \n" );
append_error( str );
append_error( "\n" );
append_error(PQerrorMessage(pg_conn));
report_error();
PQclear(res);
if ( str )
free ( str );
return DB_FAILED;
}
if ( str )
free ( str );
PQclear(res);
return DB_OK;
}
int db__driver_begin_transaction(void)
{
PGresult *res;
G_debug (2, "pg : BEGIN");
init_error();
res = PQexec(pg_conn, "BEGIN");
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK) {
append_error( "Cannot 'BEGIN' transaction");
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");
init_error();
res = PQexec(pg_conn, "COMMIT");
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK) {
append_error( "Cannot 'COMMIT' transaction" );
report_error();
PQclear(res);
return DB_FAILED;
}
PQclear(res);
return DB_OK;
}
|
