Mybaits配置文件之动态SQL配置备忘录

动态参数拼接的查询语句

?传入参数类型为自定义数据类型

<select id="queryMessageList" parameterType="com.imooc.bean.Message"
    resultMap="MessageResult">
    select ID,COMMAND,DESCRIPTION,CONTENT from MESSAGE where 1=1
    <if test="command !=null &&!"".equals(command.trim())">
      and COMMAND=#{command}
    </if>
    <if test="description != null and !"".equals(description.trim())">
      and DESCRIPTION like '%' #{description} '%'
    </if>
  </select>

删除单条数据

?传入参数类型为String与基本数据类型

<delete id="deleteOne" parameterType="int">
    delete from MESSAGE WHERE ID = #{_parameter}
</delete>

删除多条数据

?传入参数类型为List

  <delete id="deleteBatch" parameterType="java.util.List">
    delete from MESSAGE WHERE ID in (
    <foreach collection="list" item="item" separator=",">
      #{item}
    </foreach>
    )
  </delete>

以上所述是小编给大家介绍的Mybaits配置文件之动态SQL配置备忘录，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！