Mybaits--配置文件之動態SQL配置備忘錄

動態參數拼接–select語句

–傳入參數類型爲自定義數據類型

<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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刪除單條數據–delete語句

–傳入參數類型爲String或基本數據類型

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

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刪除多條數據–delete拼接語句

–傳入參數類型爲List

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