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75 lines
2.0 KiB
Groff
75 lines
2.0 KiB
Groff
.\" Automatically generated by Pandoc 3.5
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.\"
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.TH "mysql_select_db" "3" "" "Version 3.4" "MariaDB Connector/C"
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.SS Name
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mysql_select_db \- selects a database as default
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.SS Synopsis
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.IP
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.EX
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#include \f[B]<mysql.h>\f[R]
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int mysql_select_db(MYSQL * mysql,
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const char * db);
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.EE
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.SS Description
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Selects a database as default.
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Returns zero on success, non\-zero on failure
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.SS Parameters
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.IP \[bu] 2
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\f[CR]mysql\f[R] is a connection identifier, which was previously
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allocated by \f[B]mysql_init(3)\f[R] and connected by
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\f[B]mysql_real_connect(3)\f[R].
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.IP \[bu] 2
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\f[CR]db\f[R] \- the default database name
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.SS Notes
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.IP \[bu] 2
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To retrieve the name of the default database either execute the SQL
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command \f[CR]SELECT DATABASE()\f[R] or retrieve the value via
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\f[B]mariadb_get_infov(3)\f[R] API function.
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.IP \[bu] 2
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The default database can also be set by the db parameter in
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\f[B]mysql_real_connect(3)\f[R].
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.SS Examples
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.SS SQL
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.IP
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.EX
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# \f[B]switch\f[R] \f[B]to\f[R] \f[B]default\f[R] \f[B]database\f[R] test
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\f[B]USE\f[R] test;
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# \f[B]check\f[R] \f[B]default\f[R] \f[B]database\f[R]
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\f[B]SELECT\f[R] \f[B]DATABASE\f[R]();
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+\f[I]\-\-\-\-\-\-\-\-\-\-\-\-+\f[R]
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| \f[B]database\f[R]() |
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+\f[I]\-\-\-\-\-\-\-\-\-\-\-\-+\f[R]
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| test |
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+\f[I]\-\-\-\-\-\-\-\-\-\-\-\-+\f[R]
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.EE
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.SS MariadDB Connector/C
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.IP
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.EX
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static int set_default_db(MYSQL *mysql)
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{
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int rc;
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char *default_db;
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\f[I]/* change default database to test */\f[R]
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rc= mysql_select_db(mysql, \[dq]test\[dq]);
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\f[B]if\f[R] (rc)
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\f[B]return\f[R] rc; \f[I]/* Error */\f[R]
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\f[I]/* get the default database */\f[R]
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rc= mariadb_get_infov(mysql, MARIADB_CONNECTION_SCHEMA, &default_db);
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\f[B]if\f[R] (rc)
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\f[B]return\f[R] rc; \f[I]/* Error */\f[R]
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\f[B]if\f[R] (strcmp(\[dq]test\[dq], default_db) != NULL)
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{
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printf(\[dq]Wrong default database\[rs]n\[dq]);
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\f[B]return\f[R] 1;
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}
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printf(\[dq]Default database: %s\[dq], default_db);
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\f[B]return\f[R] 0;
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}
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.EE
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.SS See also
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\f[B]mysql_real_connect(3)\f[R]
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