MySQL Utilities

园子看到使用MySQL对比数据库表结构，参考测试发现

[[email protected] uest]# mysqldiff --server1=dba:[email protected] --server2=dba:[email protected] --changes-for=server2 --show-reverse --difftype=sql test.test1:test.test2
bash: mysqldiff: command not found
[[email protected] uest]# 

搜索才知道mysqldiff工具是官方mysql-utilities工具集的一个脚本。mysqldiff用来比较对象的定义是否相同并显示不同的地方，mysqldiff 是通过对象名称来进行比较的。
系统环境紧接上一篇，因此需下载相应的rpm包

[[email protected] tools]# wget https://cdn.mysql.com//Downloads/MySQLGUITools/mysql-utilities-1.6.5-1.el6.noarch.rpm
[[email protected] tools]# rpm -ivh mysql-utilities-1.6.5-1.el6.noarch.rpm
warning: mysql-utilities-1.6.5-1.el6.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
    mysql-connector-python >= 2.0.0 is needed by mysql-utilities-1.6.5-1.el6.noarch
[[email protected] tools]#

需要依赖文件

[[email protected] tools]# wget https://cdn.mysql.com//Downloads/Connector-Python/mysql-connector-python-2.1.5-1.el6.i686.rpm
[[email protected] tools]# rpm -ivh mysql-connector-python-2.1.5-1.el6.i686.rpm
warning: mysql-connector-python-2.1.5-1.el6.i686.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql-connector-python ########################################### [100%]
[[email protected] tools]# rpm -ivh mysql-utilities-1.6.5-1.el6.noarch.rpm
warning: mysql-utilities-1.6.5-1.el6.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                ########################################### [100%]
   1:mysql-utilities        ########################################### [100%]
[[email protected] tools]#

然后就可以执行mysqldiff命令了

[[email protected] tools]# mysqldiff --server1=dba:[email protected] --server2=dba:[email protected] --changes-for=server2 --skip-table-options --show-reverse --difftype=sql test.test1:test.test2
# WARNING: Using a password on the command line interface can be insecure.
# server1 on localhost: ... connected.
# server2 on localhost: ... connected.
# Comparing test.test1 to test.test2                               [FAIL]
# Transformation for --changes-for=server2:
#

ALTER TABLE `test`.`test2`
  DROP COLUMN D,
  ADD PRIMARY KEY(`id`),
  CHANGE COLUMN b b varchar(10) NULL,
  ADD COLUMN d int(11) NULL AFTER c,
  CHANGE COLUMN a a varchar(10) NOT NULL,
  CHANGE COLUMN c c varchar(10) NULL COMMENT ‘c‘;

#
# Transformation for reverse changes (--changes-for=server1):
#
# ALTER TABLE `test`.`test1`
#   DROP PRIMARY KEY,
#   DROP COLUMN d,
#   CHANGE COLUMN b b varchar(5) NULL,
#   ADD COLUMN D int(11) NULL AFTER c,
#   CHANGE COLUMN a a varchar(10) NULL,
#   CHANGE COLUMN c c varchar(10) NULL;
#

# Compare failed. One or more differences found.
[[email protected] tools]# 

MySQL Utilities 提供一组命令行工具用于维护和管理 MySQL 服务器，可参考官方手册，或者查阅MySQL Utilities教程。