将 MySQL SELECT 语句中的值存储到变量?
我们首先创建一个表 -
mysql> create table DemoTable631 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,StudentName varchar(100) ); Query OK, 0 rows affected (0.83 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable631(StudentName) values('John Smith'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable631(StudentName) values('Adam Smith'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable631(StudentName) values('David Miller'); Query OK, 1 row affected (0.16 sec)
使用 select 语句从表中显示所有记录 -
mysql> select *from DemoTable631;
这将生成以下输出 -
+-----------+--------------+ | 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); Query OK, 0 rows affected (0.00 sec)
现在,您可以显示变量的值 -
mysql> select @fullName;
这将生成以下输出 -
+------------+ | @fullName | +------------+ | Adam Smith | +------------+ 1 row in set (0.00 sec)
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