mybatis注解与xml常用语句汇总

public interface UserMapper {
 //查询
 @Select("select * from user where id=#{id}")
 User selectUser(int id);
 //查询全部
 @Select("select * from user")
 List<User> selectUserList();
 //增加数据
 @Insert("insert into user (name) values(#{name})")
 boolean insertUser(String name);
 //修改用户
 @Update("update user set name=#{name} where id=#{id}")
 boolean updateUser(@Param("name") String name,@Param("id") int id);
 //删除用户
 @Delete("delete from user where id=#{id}")
 boolean deleteUser(int id);
}

@Select("select * from user")
@Results({
 @Result(id = true,property = "id",column = "id"),//id=true 对应于主键
 @Result(property = "uid",column = "uid"),
 @Result(property = "user",column = "uid",javaType = User.class,
 one = @One(select = "com.example.dao.UserDao.findUserByid",fetchType = FetchType.DEFAULT))
 //user 对应实体类中一对一的实体类名字，uid表示通过uid外键查询User，JavaType表示查询结果
 //映射成User类型对象，one=表示一对xx fetchType.default默认是立即加载全部查询，使用lazy懒加载需要才查询
})
List<User> selectUserList();

<resultMap id="BaseResultMap" type="xx" >
 <id column="id" property="ID" jdbcType="BIGINT" />
 <result column="aa" property="aa" jdbcType="VARCHAR" />
 <result column="bb" property="bb" jdbcType="INTEGER" />
 <result column="cc" property="cc" jdbcType="DECIMAL" javaType="java.math.BigDecimal" />
 <result column="dd" property="dd" jdbcType="DATE" />
</resultMap>

 <sql id="Base_Column_List" >
 aa, bb
 </sql>

 <sql id="where">
 <trim prefix="WHERE" prefixOverrides="AND|OR">
 <if test="id != null and id != ''">
  AND t.ID = #{id}
 </if>
 <if test="content != null and content != ''">
  AND t.CONTENT LIKE concat('%', #{content},'%')
 </if>
 AND t.APP_CODE IN
 <foreach item="item" index="index" collection="appcodes"
  open="(" separator="," close=")">
  #{item}
 </foreach>
 and t.USER_ID=u.id and t.REMOVED=0
 </trim>
</sql>

 <insert id="insert" parameterType="xxx"
 useGeneratedKeys="true" keyColumn="id" keyProperty="id">
 insert into xxx (
 <trim suffixOverrides=",">
  <if test="title != null and title != '' ">
   TITLE ,
  </if>
 </trim>
 ) VALUES (
 <trim suffixOverrides=",">
  <if test="title != null and title != '' ">
   #{title} ,
  </if>
 </trim>
 )
</insert>

<update id="update" parameterType="xxx">
 UPDATE xxx
 <set>
  <if test="title != null and title != '' ">
   TITLE = #{title} ,
  </if>
 </set>
 WHERE
 ID = #{id}
</update>

<update id="xxxUpdate" parameterType="java.util.List">
 update xxx
 <trim prefix="set" suffixOverrides=",">
  <trim prefix="AA =case" suffix="end,">
   <foreach collection="orders" item="item" index="index">
    <if test="item.aa !=null">
     when ID=#{item.id} then #{item.aa}
    </if>
   </foreach>
  </trim>
  <trim prefix="BB =case" suffix="end,">
   <foreach collection="orders" item="item" index="index">
    <if test="item.bb !=null">
     when ID=#{item.id} then #{item.bb}
    </if>
   </foreach>
  </trim>
 </trim>
 where ID in
 <foreach collection="orders" index="index" item="item" separator="," open="(" close=")">
  #{item.id,jdbcType=BIGINT}
 </foreach>
</update>

#mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl