SpringBoot整合MyBatis逆向工程及 MyBatis通用Mapper实例详解

一、添加所需依赖，当前完整的pom文件如下：

"http://maven.apache.org/POM/4.0.0" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" >
 4.0 . 0

  org.springframework.boot
  spring-boot-starter-parent
  1.5 . 6 .RELEASE

 org.rcddup
 rcddup-custom
 1.0 . 0

  1.8
  1.3 . 1
  3.4 . 3
  1.3 . 3
  1.1 . 4
  1.2 . 1




   org.springframework.boot
   spring-boot-starter-web



   org.mybatis.spring.boot
   mybatis-spring-boot-starter
   ${mybatis.version}



   org.mybatis.generator
   mybatis-generator-core
   ${mybatis-generator.version}



   tk.mybatis
   mapper-spring-boot-starter
   ${mybatis-tk.version}



   mysql
   mysql-connector-java






    org.mybatis.generator
    mybatis-generator-maven-plugin
    ${mybatis.generator.version}


      mysql
      mysql-connector-java
      ${mysql.version}


      tk.mybatis
      mapper
      ${mapper.version}




     true

     true


      ${basedir}/src/main/resources/generator/generatorConfig.xml

　　MyBtais 结合通用 Mapper 非常好使，接下来看逆向工程的配置。

　　有关通用Mapper的信息，请查看：https://github.com/abel533/Mapper

二、generatorConfig.xml

"1.0" encoding= "UTF-8" ?>

  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >


 "application.properties" />

 "Mysql" targetRuntime= "MyBatis3Simple" defaultModelType= "flat" >
  "beginningDelimiter" value= "`" />
  "endingDelimiter" value= "`" />

  "tk.mybatis.mapper.generator.MapperPlugin" >
   "mappers" value= "${generator.mappers}" />


  "org.mybatis.generator.plugins.ToStringPlugin" />

  "org.mybatis.generator.plugins.SerializablePlugin" />



  "${spring.datasource.driver-class-name}"
   connectionURL= "${spring.datasource.url}"
   userId= "${spring.datasource.username}"
   password= "${spring.datasource.password}" >

  "${generator.javaModel-targetPackage}"
   targetProject= "${generator.targetProject}" />
  "${generator.sqlMap-targetPackage}"
   targetProject= "${generator.targetProject}" />
  "${generator.javaClient-targetPackage}"
   targetProject= "${generator.targetProject}" type= "XMLMAPPER" />





  "user">     "id" sqlStatement= "Mysql" identity= "true" />
   "id" sqlStatement= "Mysql" identity= "true" />

　　我们将对应的信息都在 application.properties 中定义好，在这直接使用，application.properties如下：

# Generator
generator.targetProject=src/main/java
generator.mappers=org.rcddup.app.common.base.IBaseMapper
generator.javaModel-targetPackage=org.rcddup.app.domain
generator.sqlMap-targetPackage=org.rcddup.app.dao
generator.javaClient-targetPackage=org.rcddup.app.dao

三、编写生成Mapper的集成接口IBaseMapper

package org.rcddup.app.common.base;
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
public interface IBaseMapper extends Mapper, MySqlMapper {
}

　　集成的 Mapper 以及 MySqlMapper 几乎包含了你所有的 CRUD方法。

四、使用逆向工程生成我们的第一个文件

　　右键项目 --> Maven --> Maven build --> Goals: mybtais-generator:generate，点击 run.....

　　我们的UserMapper以及UserMapper.xml就生成了。

　　（1）UserMapper.java

package org.rcddup.app.dao;
import org.rcddup.app.common.base.IBaseMapper;
import org.rcddup.app.domain.User;
public interface UserMapper extends IBaseMapper {
}

　　（2）UserMapper.xml

"1.0" encoding= "UTF-8" ?>
"-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
"org.rcddup.app.dao.UserMapper" >
 "BaseResultMap" type= "org.rcddup.app.domain.User" >

 "id" jdbcType= "BIGINT" property= "id" />
 "name" jdbcType= "VARCHAR" property= "name" />
 "age" jdbcType= "TINYINT" property= "age" />
 "status" jdbcType= "TINYINT" property= "status" />

　　是不是发现xml中都没有配置任何CRUD方法。

五、重新编写 UserService.java

　　我们原先编写的 UserService 现在我们用新生成的 UserMapper 来重新编写。

package org.rcddup.app.service.impl;
import java.util.List;
import org.rcddup.app.dao.UserMapper;
import org.rcddup.app.domain.User;
import org.rcddup.app.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import tk.mybatis.mapper.entity.Example;
@Service
public class UserService implements IUserService{
 @Autowired
 private UserMapper userMapper;
 @Override
 public List listUser() {
  return userMapper.selectAll();
 }
 @Override
 public User getUserById(Long id) {
  // 方法一：适用于任何字段的查询
//  Example example = new Example(User.class);
//  example.createCriteria().andEqualTo("id", id);
//  List list = userMapper.selectByExample(example);
//  if (list != null && list.size() > 0) {
//   return list.get(0);
//  } else {
//   return null;
//  }
  // 方法二：只适用于主键字段
  return userMapper.selectByPrimaryKey(id);
 }
}

六、启动 App.java

　　输入：localhost:8080/user/get?id=1

　　输入：localhost:8080/user/list

　　好了，到这我们整合了Mybatis逆向工程以及通用Mapper。