Java

逆向工程是什么呢？ 说白了就是 mybatis 中提供了一个可以让你从 已经创建好的 数据库中，去通过表名，生成对应类，类属性和XML文件(sql语句)。

源码：mybatis_AutoGenerator

开始配置：

1. src 下创建 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>

    <context id="mysqlTables" targetRuntime="MyBatis3">

        <!--数据库配置-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/table_name"
                        userId="root"
                        password="">
        </jdbcConnection>

        <!-- java类型解析 -->
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- 模型生成包名-->
        <javaModelGenerator targetPackage="com.q.backoffice.model" targetProject=".src">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- mybatis的映射.xml-->
        <sqlMapGenerator targetPackage="com.q.backoffice.mapper"  targetProject=".src">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- mybatis 的mapper接口生成的包路径-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.q.backoffice.mapper"  targetProject=".src">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 配置生成表的模型-->
        <table tableName="items"/>
        <table tableName="orderdetail" domainObjectName="OrderDetail"></table>
        <table tableName="orders"></table>
        <table tableName="user"></table>

    </context>
</generatorConfiguration>

2. 创建一个类，并编写生成代码，运行后即可生成完毕

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

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

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