将值从MySQL SELECT语句存储到变量？
让我们首先创建一个表-
mysql> create table DemoTable631 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,StudentName varchar(100) );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable631(StudentName) values('John Smith');
mysql> insert into DemoTable631(StudentName) values('Adam Smith');
mysql> insert into DemoTable631(StudentName) values('David Miller');使用select语句显示表中的所有记录-
mysql> select *from DemoTable631;
这将产生以下输出-
+-----------+--------------+ | StudentId | StudentName | +-----------+--------------+ | 1 | John Smith | | 2 | Adam Smith | | 3 | David Miller | +-----------+--------------+ 3 rows in set (0.00 sec)
以下是将值从select存储到变量的查询-
mysql> set @fullName=(select StudentName from DemoTable631 where StudentId=2);
现在您可以显示变量的值-
mysql> select @fullName;
这将产生以下输出-
+------------+ | @fullName | +------------+ | Adam Smith | +------------+ 1 row in set (0.00 sec)