【Java】MyBatis应用(四)逆向工程
正文索引 [隐藏]
MyBatis框架需要:实体类、自定义Mapper接口、Mapper.xml
传统发开中上述三个组件需要开发者手动创建,逆向工程可以帮助开发者自动创建三个组件,减轻开发者的工作量,提高工作效率
如何使用逆向工程
MyBatis Generator,简称MBG,是一个专门为Mybatis框架开发者定制的代码生成器,可自动生成MaBatis框架所需的实体类、Mapper接口和Mappler.xml,支持基本的CRUD操作,但是一些相对复杂的SQL需要开发者自己来完成
- 新建Maven工程,pom.xml
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.21</version>
</dependency>
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator</artifactId>
<version>1.3.2</version>
</dependency>
</dependencies>
1、jdbcConnect配置数据库连接信息
2、javaModelGenerator配置JavaBean的生成策略
3、sqlMapGenerator配置SQL映射文件生成策略
4、JavaClientGenerator配置Mapper接口的生成策略
5、table配置目标数据表(tbaleName:表名,domainObjectName:JavaBean类名)
<?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="mybatis" targetRuntime="MyBatis3">
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"
userId="root" password="123456">
</jdbcConnection>
<javaModelGenerator targetPackage="com.mybatistest.entity" targetProject=".\src\main\java">
</javaModelGenerator>
<sqlMapGenerator targetPackage="com.mybatistest.repository" targetProject=".\src\main\java">
</sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER" targetPackage="com.mybatistest.repository" targetProject=".\src\main\java">
</javaClientGenerator>
<table tableName="t_user" domainObjectName="User">
</table>
</context>
</generatorConfiguration>
package com.mybatis.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 Main {
public static void main(String[] args) {
List<String>warings = new ArrayList<String>();
boolean overwrite = true;
String genCig = "/generatorConfig.xml";
File configFile = new File(Main.class.getResource(genCig).getFile());
ConfigurationParser configurationParser = new ConfigurationParser(warings);
Configuration configuration = null;
try {
configuration = configurationParser.parseConfiguration(configFile);
} catch (IOException e) {
e.printStackTrace();
} catch (XMLParserException e) {
e.printStackTrace();
}
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = null;
try {
myBatisGenerator = new MyBatisGenerator(configuration,callback,warings);
} catch (InvalidConfigurationException e) {
e.printStackTrace();
}
try {
myBatisGenerator.generate(null);
} catch (SQLException throwables) {
throwables.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

原文链接:【Java】MyBatis应用(四)逆向工程
姚姚的小站 版权所有,转载请注明出处。