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HomeDatabaseMysql Tutorial使用DdlUtils和Ant进行不同数据库之间schema和data的转换

在开发过程中常常要用到多种数据库类型,比如项目可能需要支持Oracle, MySQL, MSSQL Server, Derby等等。已经有很多各种各样的小

在开发过程中常常要用到多种数据库类型,,比如项目可能需要支持Oracle, MySQL, MSSQL Server, Derby等等。已经有很多各种各样的小工具可以帮助开发人员进行数据库之间的schema、data转换与同步,DdlUtils 就是其中之一。它可以结合Ant或者程序代码进行数据库schema/data和xml文件的相互转换。

例如,项目开发支持的是MySQL,而为了单元测试的整洁和方便,开发人员决定使用Derby来支持单元测试。DdlUtils就可以把schema和数据从MySQL中导出,变成xml文件,然后根据需要导入到Derby中;反之亦可。显然,这些导出的xml文件也是对于数据库的一个很好的备份。

下面是apache ddlutils官网给出的一个xml的例子,table和column标签里面支持的child和attribute远不止示例中的这些。

DdlUtils包含了3个Ant Task,分别是databaseToDdl, ddlToDatabase以及dumpMetadata。

使用ddlToDatabase的示例:

这个Ant任务创建了一个PostgreSQL数据库,把xml中定义的schema和data导入到数据库中。

使用databaseToDdl的示例:

这个Ant任务把derby数据库中的schema和data导出到xml文件中。

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