1 -- 字符串拼接 2 SET @this_year=YEAR(CURDATE()); 3 SET @str=CONCAT('select time from tb_history_',@this_year) 4 PREPARE stmt from @str; 5 EXECUTE stmt; 6 DEALLOCATE stmt; 7 8 -- 视图 9 DROP VIEW IF EXISTS ai; 10 CREATE VIEW ai 11 SELECT * FROM tb_history; 12 13 -- 存储过程(无参) 14 DROP PROCEDURE IF EXISTS test; 15 CREATE PROCEDURE test() 16 BEGIN 17 SET @a=1; 18 SELECT @a; 19 end 20 CALL test; 21 -- 存储过程(输入参数) 22 set @a=0; 23 DROP PROCEDURE IF EXISTS test_in; 24 CREATE PROCEDURE test_in(in a INT) 25 BEGIN 26 SELECT a; 27 SET a=2; 28 SELECT a; 29 END; 30 CALL test_in(@a); 31 SELECT @a; 32 -- 存储过程(输出参数) 33 set @a=0; 34 DROP PROCEDURE IF EXISTS test_out; 35 CREATE PROCEDURE test_out(out a INT) 36 BEGIN 37 SELECT a; 38 SET a=2; 39 SELECT a; 40 END; 41 CALL test_out(@a); 42 SELECT @a; 43 -- 存储过程(输入输出参数) 44 SET @a=0; 45 DROP PROCEDURE IF EXISTS test_inout; 46 CREATE PROCEDURE test_inout(inout a INT) 47 BEGIN 48 SELECT a; 49 SET a=2; 50 SELECT a; 51 END; 52 CALL test_inout(@a); 53 SELECT @a; 54 55 -- 查看开启定时器。 注意:服务器重启,定时器会关闭。 56 show VARIABLES LIKE 'event_scheduler'; 57 set GLOBAL event_scheduler=ON; 58 -- 定时器 59 CREATE EVENT test_second 60 ON SCHEDULE EVERY 3 SECOND STARTS '2018-01-01 00:00:01' 61 DO CALL test_second(); 62 DROP EVENT IF EXISTS test_second;
【2018-11-28】常用sql
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转载自www.cnblogs.com/zqyyx/p/10030917.html
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