SELECT a_name FROM a WHERE INSTR(CONCAT(',',?,','),CONCAT(',',a_id,','))>0;//?=82,83
同于:SELECTa_name FROM a WHERE a_id in(82,83);
SELECT a_name FROM a WHERE INSTR(CONCAT(',',?,','),CONCAT(',',a_id,','))>0;//?=82,83
同于:SELECTa_name FROM a WHERE a_id in(82,83);