Mybatis常用配置

<mapper namespace="Message">
    <!--type：与数据库对应的模型类， id即为名字-->
    <resultMap type="main.entity.Message" id="MessageResult">
        <!--cloumn：数据库的列名 jdbcType:对应的类型，注意要用大写， property:模型类对应的属性名-->
        <!--主键是id 其他是result-->
        <id column="id" jdbcType="INTEGER" property="id"/>
        <result column="command" jdbcType="VARCHAR" property="command"/>
        <result column="description" jdbcType="VARCHAR" property="description"/>
        <result column="content" jdbcType="VARCHAR" property="content"/>
    </resultMap>
    <!--将查出来的值放在resultMap所对应的column里面-->
    <!--parameterType传入查询的类参数类型-->

    <select id="queryMessageList" parameterType="main.entity.Message" resultMap="MessageResult">
        select id,command,description,content from message where 1=1
        <!--OGNL表达式   #{}在拼接mysql语句的时候， 会子自动转换为?， 并将command赋值-->
        <if test="command!=null and !&quot;&quot;.equals(command.trim())">and command=#{command}</if>
        <if test="description!=null and !&quot;&quot;.equals(description.trim())">and description = #{description}</if>
    </select>

    <!--删除语句-->
    <delete id="deleteOne" parameterType="String">
        delete from message where id=#{_parameter}
    </delete>

    <delete id="deleteBatch" parameterType="List" >
        delete from message where id in(
        <foreach collection="list" item="item" separator=",">
            #{item}
        </foreach>
        )
    </delete>
<!--select ID,COMMAND,DESCRIPTION,CONTENT from MESSAGE
        <where>
            <if test="command != null and !&quot;&quot;.equals(command.trim())">
                and COMMAND=#{command}
            </if>
            <if test="description != null and !&quot;&quot;.equals(description.trim())">
                and DESCRIPTION like '%' #{description} '%'
            </if>
        </where>-->
    <!--<delete id="deleteOne" parameterType="int">-->
  	<!--delete from MESSAGE where ID = #{_parameter}-->
  <!--</delete>-->

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

<!--最后还需要将mapper在xml中配置-->

<mappers>
  <mapper resource="/main/config/sql/Message.xml"></mapper>

</mappers>

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