mirror of
https://github.com/VCMP-SqMod/SqMod.git
synced 2024-11-08 08:47:17 +01:00
85 lines
1.8 KiB
Groff
85 lines
1.8 KiB
Groff
|
.\" Automatically generated by Pandoc 2.5
|
||
|
|
.\"
|
||
|
|
.TH "mysql_select_db" "3" "" "Version 3.2.2" "MariaDB Connector/C"
|
||
|
|
.hy
|
||
|
|
.SS Name
|
||
|
|
.PP
|
||
|
|
mysql_select_db \- selects a database as default
|
||
|
|
.SS Synopsis
|
||
|
|
.IP
|
||
|
|
.nf
|
||
|
|
\f[C]
|
||
|
|
#include <mysql.h>
|
||
|
|
|
||
|
|
int mysql_select_db(MYSQL * mysql,
|
||
|
|
const char * db);
|
||
|
|
\f[R]
|
||
|
|
.fi
|
||
|
|
.SS Description
|
||
|
|
.PP
|
||
|
|
Selects a database as default.
|
||
|
|
Returns zero on success, non\-zero on failure
|
||
|
|
.SS Parameters
|
||
|
|
.IP \[bu] 2
|
||
|
|
\f[C]mysql\f[R] is a connection identifier, which was previously
|
||
|
|
allocated by \f[B]mysql_init(3)\f[R] and connected by
|
||
|
|
\f[B]mysql_real_connect(3)\f[R].
|
||
|
|
.IP \[bu] 2
|
||
|
|
\f[C]db\f[R] \- the default database name
|
||
|
|
.SS Notes
|
||
|
|
.IP \[bu] 2
|
||
|
|
To retrieve the name of the default database either execute the SQL
|
||
|
|
command \f[C]SELECT DATABASE()\f[R] or retrieve the value via
|
||
|
|
\f[B]mariadb_get_infov(3)\f[R] API function.
|
||
|
|
.IP \[bu] 2
|
||
|
|
The default database can also be set by the db parameter in
|
||
|
|
\f[B]mysql_real_connect(3)\f[R].
|
||
|
|
.SS Examples
|
||
|
|
.SS SQL
|
||
|
|
.IP
|
||
|
|
.nf
|
||
|
|
\f[C]
|
||
|
|
# switch to default database test
|
||
|
|
USE test;
|
||
|
|
# check default database
|
||
|
|
SELECT DATABASE();
|
||
|
|
+\-\-\-\-\-\-\-\-\-\-\-\-+
|
||
|
|
| database() |
|
||
|
|
+\-\-\-\-\-\-\-\-\-\-\-\-+
|
||
|
|
| test |
|
||
|
|
+\-\-\-\-\-\-\-\-\-\-\-\-+
|
||
|
|
\f[R]
|
||
|
|
.fi
|
||
|
|
.SS MariadDB Connector/C
|
||
|
|
.IP
|
||
|
|
.nf
|
||
|
|
\f[C]
|
||
|
|
static int set_default_db(MYSQL *mysql)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
char *default_db;
|
||
|
|
|
||
|
|
/* change default database to test */
|
||
|
|
rc= mysql_select_db(mysql, \[dq]test\[dq]);
|
||
|
|
if (rc)
|
||
|
|
return rc; /* Error */
|
||
|
|
|
||
|
|
/* get the default database */
|
||
|
|
rc= mariadb_get_infov(mysql, MARIADB_CONNECTION_SCHEMA, &default_db);
|
||
|
|
if (rc)
|
||
|
|
return rc; /* Error */
|
||
|
|
|
||
|
|
if (strcmp(\[dq]test\[dq], default_db) != NULL)
|
||
|
|
{
|
||
|
|
printf(\[dq]Wrong default database\[rs]n\[dq]);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
printf(\[dq]Default database: %s\[dq], default_db);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
\f[R]
|
||
|
|
.fi
|
||
|
|
.SS See also
|
||
|
|
.PP
|
||
|
|
\f[B]mysql_real_connect(3)\f[R]
|