MyBatis 逆向工程
1. MyBatis Generator
- 简称MBG,是一个专门为MyBatis框架使用者定制的代码生成器,可以快速的根据表生成对应的映射文件,接口,以及bean类;
- 支持基本的增删改查,以及QBC风格的条件查询;
- 但是表连接,存储过程等这些复杂sql的定义需要我们手工编写;
- 所需jar包:
mybatis-generator-core;
2. 环境搭建
// 在项目下创建 mbg.xml(具体见"参考资料")
<generatorConfiguration>
<!--
targetRuntime="MyBatis3Simple": 生成简单版的CRUD
targetRuntime="MyBatis3": 生成复杂的 CRUD
-->
<context id="DB2Tables" targetRuntime="MyBatis3">
<!-- jdbcConnection: 指定如何连接到目标数据库 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/mybatis"
userId="root"
password="root">
</jdbcConnection>
<javaTypeResolver >
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- javaModelGenderator: 指定javaBean的生成策略 -->
<javaModelGenerator targetPackage="cn.itcast.mybatis.bean" targetProject="./src">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- sqlMapGenerator: sql 映射生成策略 -->
<sqlMapGenerator targetPackage="cn.itcast.mybatis.dao" targetProject="./conf">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- 指定mapper接口所在位置 -->
<javaClientGenerator type="XMLMAPPER" targetPackage="cn.itcast.mybatis.dao"
targetProject="./src">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 指定要逆向分析哪些表,根据这些表,创建 javaBean -->
<table tableName="tbl_dept" domainObjectName="Department"></table>
<table tableName="tbl_employee" domainObjectName="Employee"></table>
</context>
</generatorConfiguration>
// 编写测试类
public class MyBatisTest{
// 运行MBG
@Test
public void testMbg() throws IOException, XMLParsetException, InvalidConfiguration,
SQLException,InterruptedException{
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
File configFile = new File("mbg.xml");
ConfigurationParser cp = new ConfigurationParser(warnings);
Configuration config = cp.parseConfiguration(configFile);
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
myBatisGenerator.generate(null);
}
}
参考资料
