Mybatis and和循环or混用
这次项目用到一个and和or混用的场景 , 因为用到多个or(循环), 没想到好的办法
最终转换成用 IN实现：
场景
用left join链接多个表, 多个条件and筛选, 其中状态(state)条件筛选出多个可选状态的条目,
本来想用and 和 or 但是 or的条件是个数组参数, 需要遍历states , 可能0个可能多个, 拼了半天没有成功 , 最后发现用 IN 和FOREACH就可以了
DAO层接口
List<OrderInfoForm> selectOrdersByStatesSelective(
@Param(value="order")Order order,
@Param(value="states")Integer[] states);Mybatis实现
<select id="selectOrdersByStatesSelective" resultMap="AllResultMap" >
select
<include refid="All_Column_List" />
from order_list
LEFT JOIN product_method ON product_method.`code` = order_list.purchase_method
LEFT JOIN product_color ON product_color.`code` = order_list.color
LEFT JOIN product_guarantee ON product_guarantee.`code` = order_list.guarantee
LEFT JOIN product_info ON order_list.product_id = product_info.id
LEFT JOIN product_model ON product_info.model = product_model.`code`
LEFT JOIN product_standard ON product_info.standard = product_standard.`code`
LEFT JOIN product_state ON product_state.`code` = order_list.order_state
LEFT JOIN product_apperance ON product_apperance.`code` = order_list.apperance
LEFT JOIN product_brand ON product_brand.`code` = product_info.brand
<where>
<if test="order.orderNum != null " >
order_num like "%"#{order.orderNum,jdbcType=VARCHAR}"%"
</if>
<if test="order.operator != null " >
and operator like "%"#{order.operator,jdbcType=VARCHAR}"%"
</if>
<if test="order.purchaseTime != null" >
and purchase_time = #{order.purchaseTime,jdbcType=DATE}
</if>
<if test="order.orderState != null" >
and order_state = #{order.orderState,jdbcType=VARCHAR}
</if>
<if test="order.serialNum != null" >
and serial_num like "%"#{order.serialNum,jdbcType=VARCHAR}"%"
</if>
<if test="states != null and states.length >0">
<foreach collection="states" item="state" separator="," open=" and order_state in (" close=")">
#{state,jdbcType=BIGINT}
</foreach>
</if>
</where>
</select>这里的重点是：
<if test="states != null and states.length >0">
<foreach collection="states" item="state" separator="," open=" and order_state in (" close=")">
#{state,jdbcType=BIGINT}
</foreach>
</if>把多个state的or关系转化为 states in (state1,state2,state3...)
in中用foreach循环
mybatis plus and 和or合并写法
记录一下and 和 or 混合使用
sql 语句实现
SELECT * FROM somc_operation_plan
WHERE ( title LIKE '%测试%' AND ( charge_user = 'xxx' OR execute_user = 'xxx' ) )
LambdaQueryWrapper<SomcOperationPlan> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.like(StringUtils.isNotEmpty(operationPlan.getTitle()), SomcOperationPlan::getTitle, operationPlan.getTitle())
.and(wrapper -> wrapper.eq(StringUtils.isNotEmpty(operationPlan.getChargeUser()), SomcOperationPlan::getChargeUser, operationPlan.getChargeUser()).or().eq(StringUtils.isNotEmpty(operationPlan.getExecuteUser()), SomcOperationPlan::getExecuteUser, operationPlan.getExecuteUser()));以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
