如果MySql C＃中不存在则插入数据

Question

I already found the MySQL query that I want to use

INSERT INTO tbl_time_in (studentID, studentDAY, studentDATE, studentTIME_IN, temp_schedule_ID)
SELECT *  
FROM (SELECT 'rupert', 'Tuesday', 'June 29, 2016' ,'23:20', '59') AS tmp
WHERE NOT EXISTS (SELECT studentID 
                  FROM tbl_time_in 
                  WHERE studentID = 'rupert' and studentDATE = 'June 29, 2016' and temp_schedule_ID = '59')

but I also want to know how could I implement this in C# correctly.

I tried to use ExecuteNonQuery and ExecuteReader but it always gives an empty result.

Answer 1

In MySQL database you can use the ON DUPLICATE KEY UPDATE function this will lessen using of sub query. Check this link for further references.

Answer 2

好吧，您可以在if else语句中实现此操作，使用整数计数器检查数据是否存在，第一次触发count语句并将结果存储为整数，第二次将结果与0值进行比较-如果结果> 0，则数据存在于数据库中，否则（表示结果= 0）插入查询