1.9、使用MyBatis的逆向工程生成Bean、mapper

maven 中央仓库搜索 mybatis generator core：

    <!--mybatis-generator-core 逆向工程，生成mapper、bean-->
    <!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.4.0</version>
    </dependency>

2、创建配置文件：

<?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>
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!--配置数据库连接信息-->
        <jdbcConnection
                driverClass="com.mysql.cj.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/myb?serverTimezone=UTC"
                userId="root"
                password="941941">
        </jdbcConnection>
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!--
        指定JavaBean生成的位置
        targetPackage：生成的包路径
        targetProject：生成的工程路径
        -->
        <javaModelGenerator targetPackage="com.wzy.pojo" 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，mapper接口-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.wzy.dao"  targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
        <!--
        指定每个表的生成策略
        tableName：表名。
        domainObjectName：生成的 javabean 名。
        -->
        <table tableName="myb_emp" domainObjectName="Employee"/>
        <table tableName="myb_dept" domainObjectName="Department"/>
    </context>
</generatorConfiguration>

自动生成：

package com.wzy.test;

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

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

public class MBGtest {
    public static void main(String[] args) throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src/main/resources/mbg.xml");//指定生成策略文件 mbg.xml，其他不变
        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);
    }
}