如何使用Erwin进行基于MySQL的数据库设计_MySQL
ERwin是常用的进行数据库设计的工具,支持众多的数据库,可惜不支持MYSQL,大概是因为很少有企业用到MYSQL吧,但是MYSQL实际上还是很优秀的。
为了能够使用ERWIN能够进行基于MYSQL数据库的物理设计,可以采用以下方法步骤:
(假定你已经有了一个设计好的LOGICAL MODEL)
1.安装MYSQL的ODBC DRIVER,可以去MYSQL.COM,有链接可以下载。
2.在ODBC的管理程序中建立一个连接你的MYSQL数据库的USER DSN。
3.从已建立好的LOGICAL MODEL生成一个基于ODBC 2.0的PHYSICAL MODEL。
4.这步是重点:
因为基于ODBC生成的数据库脚本并不完全兼容MYSQL的SQL语法,所以还需要做些其他的工作。例如,有时候需要用到DATETIME TYPE,但是只能生成DATE TYPE,我们可以采用SQL脚本来完成,ERWIN支持的脚本有两种:MODEL-LEVEL, TABLE-LEVEL.前者是针对整个PHYSICAL MODEL,而后者可以用于1个或多个TABLE。根据运行顺序,又分两种:
Pre Script, Post Script。看名字就知道意思了。如果我们想把表里的"CREATE_ON"的TYPE设置为DATETIME,可以生成一个TABLE-LEVEL SCRIPT:
ALTER TABLE %TableName MODIFY CREATE_ON DATETIME%TableName是ERWIN自带的宏,还有许多其他的宏,关于这方面的,可以看帮助。
你也可以根据自己的需要,定义不同的SCRIPT(例如,需要设置一个字段为AUTO_INCREMENT)。
5.在FORWARD ENGINEER里根据实际情况选择Pre Script,Post Script,然后生成即可

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