Mybatis 逆向工程

【表emp】
CREATE TABLE emp(
    id int primary key auto_increment,
    name varchar(50),
    salary double,
    age int,
    d_id int
);

【表dept】
CREATE TABLE dept(
    id int primary key auto_increment,
    name varchar(50)
);

【dept的主键 是emp 的外键】
ALTER TABLE emp ADD CONSTRAINT fk_emp_dept FOREIGN KEY(d_id) REFERENCES dept(id);

【地址：】
https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core
https://mvnrepository.com/artifact/mysql/mysql-connector-java

【使用 maven 的依赖信息如下：】

<!-- 逆向工程所需的依赖信息 -->
<!-- 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>


<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.18</version>
</dependency>

【mybatis-generator.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">
        <!-- step1: 配置数据库连接信息 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/lyh"
                        userId="root"
                        password="123456">
        </jdbcConnection>

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

        <!-- step2: 指定java bean生成的位置
            targetProject 指的是 哪个项目
            targetPackage 指的是 项目中的路径
        -->
        <javaModelGenerator targetPackage="com.lyh.bean" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- step3：指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.lyh.mapper" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!-- step4: 指定接口生成的位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.lyh.dao" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!-- step5: 指定表的生成策略
            tableName 指定表名
            domainObjectName 指定表对应的 实体类的名字
        -->
        <table tableName="emp" domainObjectName="Employee"></table>
        <table tableName="dept" domainObjectName="Department"></table>
    </context>
</generatorConfiguration>

【com.lyh.test.TestMybatisGenerator】
package com.lyh.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.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;

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

public class TestMybatisGenerator {
    public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src//mybatis-generator.xml");
        System.out.println(configFile);
        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);
    }
}

【上面截图中都带有注释信息，若想去除，需添加如下配置信息】
<!-- 清除注释信息 -->
<commentGenerator>
    <property name="suppressAllComments" value="true" />
</commentGenerator>


【mybatis-generator.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">
        <!-- 清除注释信息 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>

        <!-- step1: 配置数据库连接信息 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/lyh"
                        userId="root"
                        password="123456">
        </jdbcConnection>

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

        <!-- step2: 指定java bean生成的位置
            targetProject 指的是 哪个项目
            targetPackage 指的是 项目中的路径
        -->
        <javaModelGenerator targetPackage="com.lyh.bean" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- step3：指定sql映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="com.lyh.mapper" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!-- step4: 指定接口生成的位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.lyh.dao" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!-- step5: 指定表的生成策略
            tableName 指定表名
            domainObjectName 指定表对应的 实体类的名字
        -->
        <table tableName="emp" domainObjectName="Employee"></table>
        <table tableName="dept" domainObjectName="Department"></table>
    </context>
</generatorConfiguration>