Mybatis详解（四）----逆向工程（generator）

Mybatis的逆向工程（generator）

由表来帮我们生成dao,bean,xml映射文件

参考http://www.mybatis.org/generator/

1、首先要引入mybatis-generator的jar包

2、创建generator的配置文件

进入http://www.mybatis.org/generator/网站，找到配置的xml代码如下

进入上图红色框中的 XML Configuration.....看到如下图网页中的代码

就如下所示，下面是我配置好的generator.xml文件

<?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>
    <!--mysql架包路径  -->
  <classPathEntry location="E://maven//apache-maven-3.6.1-bin//apache-maven-3.6.1//repository//mysql//mysql-connector-java//5.1.30//mysql-connector-java-5.1.30-sources.jar" />

  <context id="DB2Tables" targetRuntime="MyBatis3">
      <!--去掉注释  -->
      <commentGenerator>
          <property name="suppressAllComments" value="true"/>
      </commentGenerator>
      <!--连接数据库  -->
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
        connectionURL="jdbc:mysql://localhost:3306/mybatis"
        userId="root"
        password="zjc">
    </jdbcConnection>

    <javaTypeResolver >
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>
    <!--bean文件的路径  -->
    <javaModelGenerator targetPackage="com.zhiyou100.zjc.bean" targetProject=".\src">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>
    <!--mapper文件的路径  -->
    <sqlMapGenerator targetPackage="com.zhiyou100.zjc.mapper"  targetProject=".\resources">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>
    <!--dao文件的路径  -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.zhiyou100.zjc.dao"  targetProject=".\src">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>
    <!--schema:数据库名
        domainObjectName:实体类名      -->
    <table schema="mybatis" tableName="users" domainObjectName="User" enableCountByExample="false"
        enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false">
      <property name="useActualColumnNames" value="true"/>
      <generatedKey column="ID" sqlStatement="DB2" identity="true" />
      <columnOverride column="DATE_FIELD" property="startDate" />
      <ignoreColumn column="FRED" />
      <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />
    </table>

  </context>
</generatorConfiguration>

 　　3、运行generator

　　　　完成上面的1和2的配置后，就可以运行generator了，

　　　　进入官网找到generator的Java运行代码，如下图所示

 　　进入红框中的Java program，找到如下代码：

　　

 　如下代码　

package com.zhiyou100.zjc.test;

import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.exception.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;

public class GeneratorTest {

    public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        // TODO Auto-generated method stub
           List<String> warnings = new ArrayList<String>();
           boolean overwrite = true;
           File configFile = new File("generator.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);

    }

}