文章目录
- 1.逆向工程简介
- 2.逆向工程的配置
- 1）创建数据库
- 2）添加pom文件坐标
- 3）编写generatorConfig.xml配置
- 4）生成对应代码
- 3.逆向工程的使用
-
1.逆向工程简介
MyBatis Generator: 简称 MBG，是一个专门为 MyBatis 框架使用者定制的代码生成器，可以快速的根据表生成对应的映射文件，接口，以及 bean 类。支持基本的增删改查，以及 QBC 风格的条件查询。但是表连接、存储过程等这些复杂 sql 的定义需要我们手工编写。
官方文档地址
http://www.mybatis.org/generator/
官方工程地址
https://github.com/mybatis/generator/releases
2.逆向工程的配置
1）创建数据库
CREATE DATABASE `project_crowd` CHARACTER SET utf8;
use project_crowd;
drop table if exists t_admin;
create table t_admin
(
id int not null auto_increment,
login_acct varchar(255) not null,
user_pswd char(32) not null,
user_name varchar(255) not null,
email varchar(255) not null,
create_time char(19),
primary key (id)
);
2）添加pom文件坐标
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.0</version>
<dependencies>
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.8</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
3）编写generatorConfig.xml配置
<!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="atguiguTables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<jdbcConnection
driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/project_crowd"
userId="root"
password="123456">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<javaModelGenerator targetProject=".\src\main\java"
targetPackage="com.atguigu.crowd.entity">
<property name="enableSubPackages" value="false"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<sqlMapGenerator targetProject=".\src\main\java"
targetPackage="com.atguigu.crowd.mapper">
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER"
targetProject=".\src\main\java"
targetPackage="com.atguigu.crowd.mapper">
<property name="enableSubPackages" value="false"/>
</javaClientGenerator>
<table tableName="t_admin" domainObjectName="Admin"/>
</context>
</generatorConfiguration>
4）生成对应代码
方式一：执行逆向生成操作的 Maven 命令
mybatis-generator:generate
方式二：代码生成器
public static void main(String[] args) throws Exception {
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
File configFile = new File(MyBatisGenerator.class.getClassLoader().getResource("generatorConfig.xml").toURI());
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);
System.out.println("MyBatis 逆向工程执行成功，刷新项目查看文件！");
}
3.逆向工程的使用
1）基本查询的测试
@Test
public void testSelect() throws Exception {
SqlSessionFactory ssf = getSqlSessionFactory();
SqlSession session = ssf.openSession();
try {
AdminMapper mapper =
session.getMapper(AdminMapper.class);
List<Admin> admins = mapper.selectAll();
for (Admin admin : admins) {
System.out.println(admin);
}
} finally {
session.close();
}
}
2）带条件查询的测试
@Test
public void testSelect() throws Exception {
SqlSessionFactory ssf = getSqlSessionFactory();
SqlSession session = ssf.openSession();
try {
AdminMapper mapper =
session.getMapper(AdminMapper.class);
AdminExample example = new AdminExample();
Criteria criteria = example.createCriteria();
criteria.andUserNameLike("%张%");
criteria.andEmailLike("%j%");
Criteria criteriaOr = example.createCriteria();
criteriaOr.andIdEqualTo(2);
example.or(criteriaOr);
List<Admin> admins = mapper.selectByExample(example);
for (Admin admin : admins) {
System.out.println(admin);
}
} finally {
session.close();
}
}
Mybatis后续的学习：
mybatis 概述 | 配置文件详解：https://blog.csdn.net/weixin_45606067/article/details/107368570
mybatis 事务 | 动态SQL | 多表查询：https://blog.csdn.net/weixin_45606067/article/details/107368642
mybatis延迟加载 | 缓存机制详解：https://blog.csdn.net/weixin_45606067/article/details/107368706
mybatis 注解开发版：https://blog.csdn.net/weixin_45606067/article/details/107368743
pageHelper分页技术：https://blog.csdn.net/weixin_45606067/article/details/107368847
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