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)