MybatisPlus的简单使用（与SpringMVC的整合）

<!--mybatisPlus  -->
 <dependency>
           <groupId>com.baomidou</groupId>
           <artifactId>mybatis-plus</artifactId>
           <version>3.3.2</version>
</dependency>

<bean id="sqlSessionFactoryBean" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
</bean>

public interface UserMapper  extends BaseMapper<User>{ }

@Data
public class House {
    private Integer id;
    private String name;
}

<!-- 序列生成策略 -->
    <bean id="globalConfig" class="com.baomidou.mybatisplus.core.config.GlobalConfig">
        <property name="dbConfig" ref="dbConfig" />
    </bean>

    <bean id="dbConfig" class="com.baomidou.mybatisplus.core.config.GlobalConfig.DbConfig">
        <property name="keyGenerator" ref="keyGenerator" />
    </bean>

    <bean id="keyGenerator" class="com.baomidou.mybatisplus.extension.incrementer.OracleKeyGenerator" />

<bean id="sqlSessionFactoryBean" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
<!-- 添加oracle序列的全局配置 -->
　　<property name="globalConfig" ref="globalConfig" />
</bean>

@Data
@KeySequence("seq_id") //序列名
public class House {
    @TableId(value = "id",type = IdType.INPUT)   //指定属性
    private Integer id;

<!-- ***修改SqlSessionFactory -->
<bean id="sqlSessionFactoryBean"
      class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
 <property name="dataSource" ref="dataSource" />
 <!-- 加载mybatis的全局配置文件 -->
 <property name="configLocation"  value="classpath:mybatis-config.xml" />
 <!-- TODO 加载sql映射文件 -->
 <property name="mapperLocations" value="classpath*:mapper/*Mapper.xml" />
 <!--别名设置 -->
 <property name="typeAliasesPackage"  value="com.zl.house.entity" />

  <!-- 添加oracle序列的全局配置 -->
  <property name="globalConfig" ref="globalConfig" />
    
  <!-- 配置分页插件 -->
   <property name="plugins">
       <array>
           <bean class="com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor">
              <!-- <property name="sqlParser" ref="自定义解析类、可以没有" />
              <property name="dialectClazz" value="自定义方言类、可以没有" />
               COUNT SQL 解析.可以没有-->
              <property name="countSqlParser" ref="countSqlParser" /> 
            </bean>
       </array>
   </property>
</bean>
    
<bean id="countSqlParser" class="com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize">
　　<!-- 设置为 true 可以优化部分 left join 的sql -->
　　<property name="optimizeJoin" value="true"/>
</bean>

<!-- 序列生成策略 -->
    <bean id="globalConfig" class="com.baomidou.mybatisplus.core.config.GlobalConfig">
        <property name="dbConfig" ref="dbConfig" />
    </bean>
    <bean id="dbConfig" class="com.baomidou.mybatisplus.core.config.GlobalConfig.DbConfig">
        <property name="keyGenerator" ref="keyGenerator" />
    </bean>
    <bean id="keyGenerator" class="com.baomidou.mybatisplus.extension.incrementer.OracleKeyGenerator" />

@Data
@AllArgsConstructor
@NoArgsConstructor
//对应数据库表中的自增系列名
@KeySequence(value = "seqhouse" )
public class Users implements Serializable{
    private static final long serialVersionUID = -809025169738892344L;
    //给指定类加上序列,input通过自己注册自动填充插件进行填充
    @TableId(value = "id",type = IdType.INPUT)
    private Integer id; //id编号
    private String name; //用户名
    private String password; //密码
    private String telephone; //电话
    private String username; //姓名
    // 如果属性名是驼峰命名法, 对应列, is_admin
    //@TableField("isAdmin")
    private String isadmin; //是否为管理员
    

//测试注册
@Test
public void testReg() throws Exception {
    Users user  = new Users();
    user.setName("qq");
    user.setPassword("666666");
    user.setTelephone("");
    user.setUsername("小武");

// 测试查询
@Test
public void testSelectById(){
User user = userMapper.selectById(1L);
System.out.println(user);
}
// 测试批量查询！
@Test
public void testSelectByBatchId(){
List<User> users = userMapper.selectBatchIds(Arrays.asList(1, 2, 3));
users.forEach(System.out::println);
}
// 按条件查询之一使用map操作
@Test
public void testSelectByBatchIds(){
HashMap<String, Object> map = new HashMap<>();
// 自定义要查询
map.put("name","狂神说Java");
map.put("age",3);
List<User> users = userMapper.selectByMap(map);
users.forEach(System.out::println);
}

// 测试分页查询
@Test
public void testPage(){
// 参数一：当前页
// 参数二：页面大小
// 使用了分页插件之后，所有的分页操作也变得简单的！
Page<User> page = new Page<>(2,5);
userMapper.selectPage(page,null);
page.getRecords().forEach(System.out::println);
System.out.println(page.getTotal());
}

// 测试删除
@Test
public void testDeleteById(){
userMapper.deleteById(1240620674645544965L);
}
// 通过id批量删除
@Test
public void testDeleteBatchId(){
userMapper.deleteBatchIds(Arrays.asList(1240620674645544961L,124062067464554496
2L));
}
// 通过map删除
@Test
public void testDeleteMap(){
HashMap<String, Object> map = new HashMap<>();
map.put("name","狂神说Java");
userMapper.deleteByMap(map);