MyBatis Plus工具快速入门使用教程

<dependency>
  <groupId>org.apache.velocity</groupId>
  <artifactId>velocity</artifactId>
  <version>1.7</version>
</dependency>
<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus</artifactId>
  <version>2.0.1</version> 
</dependency>

<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">
  <property name="dataSource" ref="dataSource"/>
  <!-- 自动扫描Mapping.xml文件 -->
  <property name="mapperLocations" value="classpath:mybatis/*/*.xml"/>
  <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
  <property name="typeAliasesPackage" value="com.baomidou.springmvc.model.*"/>
  <property name="plugins">
   <array>
    <!-- 分页插件配置 -->
    <bean id="paginationInterceptor" class="com.baomidou.mybatisplus.plugins.PaginationInterceptor">
     <property name="dialectType" value="mysql"/>
    </bean>
   </array>
  </property>
  <!-- 全局配置注入 -->
  <property name="globalConfig" ref="globalConfig" /> 
</bean>

<bean id="globalConfig" class="com.baomidou.mybatisplus.entity.GlobalConfiguration">
  <!-- 
   AUTO->`0`("数据库ID自增")
    INPUT->`1`(用户输入ID")
   ID_WORKER->`2`("全局唯一ID")
   UUID->`3`("全局唯一ID")
  -->
  <property name="idType" value="2" />
  <!--
   MYSQL->`mysql`
   ORACLE->`oracle`
   DB2->`db2`
   H2->`h2`
   HSQL->`hsql`
   SQLITE->`sqlite`
   POSTGRE->`postgresql`
   SQLSERVER2005->`sqlserver2005`
   SQLSERVER->`sqlserver`
  -->
  <!-- Oracle需要添加该项 -->
  <!-- <property name="dbType" value="oracle" /> -->
  <!-- 全局表为下划线命名设置 true -->
  <property name="dbColumnUnderline" value="true" />
 </bean>

@TableName("user")
public class User implements Serializable {
 /** 用户ID */
 private Long id;
 /** 用户名 */
 private String name;
 /** 用户年龄 */
 private Integer age;
 @TableField(exist = false)
 private String state;
}

/**
 * User 表数据库控制层接口
 */
public interface UserMapper extends BaseMapper<User> {
 @Select("selectUserList")
 List<User> selectUserList(Pagination page,String state);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.baomidou.springmvc.mapper.system.UserMapper">
 <!-- 通用查询结果列-->
 <sql id="Base_Column_List">
  id, name, age
 </sql>
 <select id="selectUserList" resultType="User">
  SELECT * FROM sys_user WHERE state=#{state}
 </select>
</mapper>

 /**
 *
 * User 表数据服务层接口实现类
 *
 */
@Service
public class UserService extends ServiceImpl<UserMapper, User>{
 public Page<User> selectUserPage(Page<User> page, String state) {
  page.setRecords(baseMapper.selectUserList(page,state));
  return page;
 }
}

@Controller
public class UserController extends BaseController {
 @Autowired
 private IUserService userService;
 @ResponseBody
 @RequestMapping("/page")
 public Object selectPage(Model model){
  Page page=new Page(1,10);
  page = userService.selectUserPage(page, "NORMAL");
  return page;
 }

public void test(){
  EntityWrapper ew=new EntityWrapper();
  ew.setEntity(new User());
  String name="wang";
  Integer age=16;
  ew.where("name = {0}",name).andNew("age > {0}",age).orderBy("age");
  List<User> list = userService.selectList(ew);
  Page page2 = userService.selectPage(page, ew);
 }

<select id="selectMyPage" resultType="User">
　　 SELECT * FROM user ${ew.sqlSegment}
</select>

@Test
public void testTSQL11() {
 /*
  * 实体带查询使用方法 输出看结果
  */
 ew.setEntity(new User(1));
 ew.where("name={0}", "'zhangsan'").and("id=1")
   .orNew("status={0}", "0").or("status=1")
   .notLike("nlike", "notvalue")
   .andNew("new=xx").like("hhh", "ddd")
   .andNew("pwd=11").isNotNull("n1,n2").isNull("n3")
   .groupBy("x1").groupBy("x2,x3")
   .having("x1=11").having("x3=433")
   .orderBy("dd").orderBy("d1,d2");
 System.out.println(ew.getSqlSegment());
}