Mybatis逆向工程快速上手

官方文档

http://mybatis.org/generator/quickstart.html

快速上手

1.添加Maven依赖

<!--Mybatis相关-->
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.7</version>
    </dependency>

    
    <!-- mysql-connector -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.16</version>
    </dependency>
    

2.在项目根目录创建mbg.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="DB2Tables" targetRuntime="MyBatis3">
    	<!--去除生成的文件里带有的注释-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
    	<!--数据库配置-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2b8&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;useSSL=false&amp;zeroDateTimeBehavior=CONVERT_TO_NULL&amp;allowPublicKeyRetrieval=true"
                        userId="root"
                        password="123456">
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

    	<!--生成POJO的位置-->
        <javaModelGenerator targetPackage="com.zzf.ssm.pojo"
                            targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

    	<!--生成Mapper文件的位置-->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

    	<!--生成dao文件的位置-->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.zzf.ssm.dao"
                             targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--指定每个表的生成策略-->
        <table tableName="tbl_emp" domainObjectName="Employee"></table>
        <table tableName="tbl_dept" domainObjectName="Department"></table>
    </context>
</generatorConfiguration>

其中MyBatis3是带有动态Sql和其它更复杂的生成，想要简单的增删查改可以使用MyBatis3Simple

3.生成工具类

package com.zzf.ssm.utils;

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;

/*
 *
 *@author:zzf
 *@time:2021-01-19
 *
 */
public class Generator {
    
    
    public void generate() throws Exception {
    
    
        List<String> warnings = new ArrayList<>();
        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);
    }

    public static void main(String[] args) {
    
    
        try{
    
    
            Generator generator=new Generator();
            generator.generate();
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
    }
}

运行工具类即可生成相关文件