mybatis中SQL语句运用总结

union 连接查询连接两个表后会过滤掉重复的值

<resultMap id="BaseResultMap" type="com.sprucetec.pay.etl.model.BillDetail"><id column="id" jdbcType="INTEGER" property="id"/><result column="pay_order_no" jdbcType="VARCHAR" property="payOrderNo"/><result column="pay_channel_id" jdbcType="TINYINT" property="payChannelId"/><result column="pay_amount" jdbcType="INTEGER" property="payAmount"/><result column="trans_date" jdbcType="INTEGER" property="transDate"/><result column="trans_type" jdbcType="VARCHAR" property="transType"/><result column="error_type" jdbcType="VARCHAR" property="errorType"/><result column="is_check" jdbcType="TINYINT" property="isCheck"/></resultMap>

<sql id="condition">
　　<if test="transType != null">
　　　　and trans_type = #{transType,jdbcType=TINYINT}
　　</if>
　　<if test="payChannelId != null">
　　　　and pay_channel_id = #{payChannelId,jdbcType=TINYINT}
　　</if>

　</sql>

<select id="queryList" parameterType="com.pay.BillCheckQuery" resultMap="BaseResultMap">select a.pay_order_no,a.trans_date,a.pay_amount,a.pay_channel_id,a.trans_type,a.error_typefrom (select pay_order_no,trans_date,pay_amount,pay_channel_id,trans_type,"无结果" as error_typefrom t_pay_core_orderwhere 1 = 1 <include refid="condition"/>union select pay_order_no,trans_date,pay_amount,pay_channel_id,trans_type,"缺失" as error_typefrom t_pay_bill_file_detail where 1 = 1 <include refid="condition"/>) as aorder by a.trans_date desclimit #{pageSize} offset #{startRecord}</select>

union all 才可以将所有的值都查询出来，自己将所有的值查询完总是少，才发现是这个问题

<select id="queryCountAndSum" parameterType="com.BillCheckQuery" resultMap="BaseResultMap">select sum(a.pay_amount) as trans_amount,count(1) as trans_num from (select pay_amount from t_pay_core_orderwhere pay_channel_id = #{payChannelId,jdbcType=SMALLINT}and trans_date &gt;= #{startTime,jdbcType=INTEGER}and trans_date &lt;= #{endTime,jdbcType=INTEGER}union allselect pay_amount from t_pay_bill_file_detail where pay_channel_id = #{payChannelId,jdbcType=SMALLINT}and trans_date &gt;= #{startTime,jdbcType=INTEGER}and trans_date &lt;= #{endTime,jdbcType=INTEGER}) as a</select>

传入对象中有list需要使用时，需要进行遍历，我在in语句中使用

<update id="updateByNum" parameterType="com.query.BillCheckQuery">update t_pay_core_order t1,t_pay_bill_file_detail t2set t1.is_check = 1,t2.is_check = 1WHERE t1.pay_order_no = t2.pay_order_noand t2.pay_order_no in<foreach item="payOrderNo" index="index" collection="orderlist" open="(" separator="," close=")">#{payOrderNo,jdbcType=VARCHAR}</foreach>and t1.trans_date &gt;= #{startTime,jdbcType=INTEGER} and t1.trans_date &lt;= #{endTime,jdbcType=INTEGER}</update>

或者直接在list中储存对象也可以遍历取出值

<insert id="batchInsert" parameterType="java.util.List" >insert into t_pay_bill_file_detail (file_id,pay_order_no,third_trade_no,trans_type,pay_channel_id,pay_amount,trans_date)values<foreach collection="list" item="item" index="index" separator=",">(#{item.payOrderNo},#{item.transType},#{item.transDate})</foreach></insert>