sql.setParam和is null怎么一起使用

SELECT
	ts.*
FROM
	t_scenic ts
WHERE
	NAME NOT IN (
		SELECT
			scenic
		FROM
			t_order_travelplan_jp
		WHERE
			orderId = @orderid
		AND scenic != @scenicname
	)
and cityId = @cityid and region = @region

上边是sql语句，下边是controller

Sql sql = Sqls.create(sqlString);
					sql.setParam("orderid", orderid);
					sql.setParam("cityid", plan.getCityId());
					sql.setParam("scenicname", plan.getScenic());

其中region参数有两种情况，region为空时需要是 region is null，但用sql.setParam("region ", region )是 region = null,怎么写最终sql才是region is null？

wendal

1楼•1810天前

把=做成变量

yanteng0124

2楼•1810天前

SELECT
	ts.*
FROM
	t_scenic ts
WHERE
	NAME NOT IN (
		SELECT
			scenic
		FROM
			t_order_travelplan_jp
		WHERE
			orderId = @orderid
		AND scenic != @scenicname
	)
and cityId = @cityid 
and 

(
CASE 
WHEN region is NULL then region is NULL
WHEN region is not NULL then region = @region
END
)

改成这样，和把=号作为变量哪个效率高？

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