mysql 数据库修改名字

通过information_schema信息修改rename database的目的

• mysql 没有rename database 命令,只能变相修改表到目标库里的表来实现:
• 拼接reanme tables的执行语句

root@localhost [information_schema]>select concat('rename table sysbench_testdata.',table_name,' to wenyz.',table_name,';') from information_schema.tables where table_sschema='sysbench_testdata';
+----------------------------------------------------------------------------------+
| concat('rename table sysbench_testdata.',table_name,' to wenyz.',table_name,';') |
+----------------------------------------------------------------------------------+
| rename table sysbench_testdata.sbtest10 to wenyz.sbtest10;                       |
| rename table sysbench_testdata.sbtest2 to wenyz.sbtest2;                         |
| rename table sysbench_testdata.sbtest3 to wenyz.sbtest3;                         |
| rename table sysbench_testdata.sbtest4 to wenyz.sbtest4;                         |
| rename table sysbench_testdata.sbtest5 to wenyz.sbtest5;                         |
| rename table sysbench_testdata.sbtest6 to wenyz.sbtest6;                         |
| rename table sysbench_testdata.sbtest7 to wenyz.sbtest7;                         |
| rename table sysbench_testdata.sbtest8 to wenyz.sbtest8;                         |
| rename table sysbench_testdata.sbtest9 to wenyz.sbtest9;                         |
+----------------------------------------------------------------------------------+
9 rows in set (0.00 sec)

• 改进:希望拼接语句直接导出到指定文件,再导入批量执行

root@localhost [information_schema]>select concat('rename table sysbench_testdata.',table_name,' to wenyz.',table_name,';') from information_schema.tables where table_schema='sysbench_testdata' into outfile '/tmp/1.sql' ;
ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement
root@localhost [information_schema]>show variables like '%secure%';
+--------------------------+-------+
| Variable_name            | Value |
+--------------------------+-------+
| require_secure_transport | OFF   |
| secure_auth              | ON    |
| secure_file_priv         | NULL  |
+--------------------------+-------+
3 rows in set (0.01 sec)

root@localhost [information_schema]>set global secure_file_priv='/tmp';
ERROR 1238 (HY000): Variable 'secure_file_priv' is a read only variable
root@localhost [information_schema]>shutdown;
#vi /3506/my.cnf //增加以下参数:
secure_file_priv=/tmp
#/usr/local/mysql57/bin/mysqld --defaults-file=/3506/my3506.cnf & //再次启动:
[2] 22558
[root@db210_14:04:44 /tmp]
#mysql --login-path=p3506
root@localhost [(none)]>select concat('rename table sysbench_testdata.',table_name,' to wenyz.',table_name,';') from information_schema.tables where table_schema='sysbench_testdata' into outfile '/tmp/1.sql' ;
Query OK, 9 rows affected (0.00 sec)

root@localhost [(none)]>source /tmp/1.sql;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    3
Current database: *** NONE ***

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

root@localhost [(none)]>use sysbench_testdata;
Database changed
root@localhost [sysbench_testdata]>show tables;
Empty set (0.00 sec)

root@localhost [sysbench_testdata]>use wenyz;
Database changed
root@localhost [wenyz]>show tables;
+-----------------+
| Tables_in_wenyz |
+-----------------+
| sbtest1         |
| sbtest10        |
| sbtest2         |
| sbtest3         |
| sbtest4         |
| sbtest5         |
| sbtest6         |
| sbtest7         |
| sbtest8         |
| sbtest9         |
| t2              |
+-----------------+
11 rows in set (0.00 sec)