MySQL数据库：
指定值在数据库中所有表所有字段值的替换(存储过程)：
1.写一个存储过程，查指定数据库中所有的表名：
CREATE PROCEDURE init_replace(in orig_str varchar(100),in new_str varchar(100),in db_name varchar(100))
BEGIN
DECLARE t_name VARCHAR(50);
DECLARE done int default 0;
DECLARE cur CURSOR FOR SELECT DISTINCT table_name as name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema=db_name;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN cur;
FETCH cur INTO t_name;
WHILE (done<>1) do
call do_replace(orig_str,new_str,db_name,t_name);
FETCH cur INTO t_name;
END WHILE;
END;
2.然后1中调用2中的方法，在查询表中所有的字段，并且指定更新值：
CREATE PROCEDURE do_replace(in orig_str varchar(100),in new_str varchar(100),in db_name varchar(100),in t_name varchar(100))
BEGIN
DECLARE cul_name VARCHAR(50);
DECLARE done int default 0;
DECLARE cur CURSOR FOR SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS where TABLE_SCHEMA=db_name and TABLE_NAME=t_name;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN cur;
FETCH cur INTO cul_name;
WHILE (done<>1) do
set @update_sql=CONCAT("Update ",t_name," SET ",cul_name,"=replace(",cul_name,",'",orig_str,"','",new_str,"');");
prepare stmt from @update_sql;
execute stmt;
FETCH cur INTO cul_name;
END WHILE;
CLOSE cur;
END;
3.调用1的方法：
启动存储过程：call init_replace('http://localhost:5005','https://www.wqbol.net','给数据库名称');