Mybaits--配置文件之动态SQL配置备忘录

动态参数拼接–select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 &amp;&amp;!&quot;&quot;.equals(command.trim())">            and COMMAND=#{command}        </if>        <if test="description != null and !&quot;&quot;.equals(description.trim())">            and DESCRIPTION like '%' #{description} '%'        </if>    </select>

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删除单条数据–delete语句

–传入参数类型为String或基本数据类型

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

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删除多条数据–delete拼接语句

–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>