MySQL 如何将查询结果赋值给变量

使用@anyVariableName将查询结果赋值给变量。让我们首先创建一个表 –

mysql> create table DemoTable1864
     (
     Id int,
     FirstName varchar(20),
     LastName varchar(20)
     );
Query OK, 0 rows affected (0.00 sec)

使用insert命令将一些记录插入表中 –

mysql> insert into DemoTable1864 values(101,'Chris','Brown');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1864 values(102,'David','Miller');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1864 values(103,'Adam','Smith');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1864 values(104,'John','Doe');
Query OK, 1 row affected (0.00 sec)

使用select语句显示表中的所有记录 –

mysql> select * from  DemoTable1864;

这将产生以下输出 –

+------+-----------+----------+
| Id   | FirstName | LastName |
+------+-----------+----------+
|  101 | Chris     |    Brown |
|  102 | David     |   Miller |
|  103 | Adam      |    Smith |
|  104 | John      |      Doe |
+------+-----------+----------+
4 rows in set (0.00 sec)

以下是将查询结果赋值给变量的查询 –

mysql> select @fName:=FirstName,@lName:=LastName
     from DemoTable1864
     where Id=103;

这将产生以下输出 –

+-------------------+------------------+
| @fName:=FirstName | @lName:=LastName |
+-------------------+------------------+
| Adam              |            Smith |
+-------------------+------------------+
1 row in set (0.00 sec)

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