Mybatis -- Generator

1.介绍：

Mybatis属于半自动ORM，在使用这个框架中，工作量最大的就是书写Mapping的映射文件，由于手动书写很容易出错，我们可以利用Mybatis-Generator来帮我们自动生成文件。

可自动生成Dao、Mapper、Model 等文件

2.背景 SSM+Maven

3.加载jar包（pom.xml）

<!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
	<dependency>
	    <groupId>org.mybatis.generator</groupId>
	    <artifactId>mybatis-generator-core</artifactId>
	    <version>1.3.5</version>
	</dependency>

4.写配置文件generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>

  <context id="DB2Tables" targetRuntime="MyBatis3">
  	<commentGenerator>
 		<property name="suppressAllComments" value="true" />
	</commentGenerator>
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
        connectionURL="jdbc:mysql://127.0.0.1:3306/test"
        userId="root"
        password="123456">
    </jdbcConnection>

    <javaTypeResolver >
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>
	
	<!-- 指定JavaBean生成的位置 -->
    <javaModelGenerator targetPackage="com.crdu.bean" targetProject=".\src\main\java">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>
	
	<!-- 指定映射文件生成的位置 -->
    <sqlMapGenerator targetPackage="mapper"  targetProject=".\src\main\resources">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>
	<!-- 指定dao接口生成的位置 -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.crdu.dao"  targetProject=".\src\main\java">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>
	<!-- 指定每个表生成的策略 -->
	<table tableName="tree" domainObjectName="Tree"></table>
  </context>
</generatorConfiguration>

5.执行配置文件

public class MBGTest {
	 public static void main(String[] args) throws Exception{
		 List<String> warnings = new ArrayList<String>();
		   boolean overwrite = true;
		   File configFile = new File("generatorConfig.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);
	}
}

6.Run as javaApplication --> 刷新

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