如何将变量传递给MySQL脚本？

2024-05-09 14:21:04 212

您可以使用会话变量将变量传递给MySQL脚本。首先，您需要使用SET命令设置会话变量。之后，您需要将该变量传递给MySQL脚本。

语法如下-

第一步：使用Set命令。

SET @anyVariableName − = ’yourValue’;

第二步：将变量传递给MySQL脚本。

UPDATE yourTableName SET yourColumnName1 = yourColumnName1+integerValue WHERE yourColumnName2 = @anyVariableName;

为了理解上述语法，让我们创建一个表。创建表的查询如下-

mysql> create table Employee_Information
   -> (
   -> EmployeeId int NOT NULL AUTO_INCREMENT,
   -> EmployeeName varchar(20) NOT NULL,
   -> EmployeeSalary int,
   -> EmployeeStatus varchar(20),
   -> PRIMARY KEY(EmployeeId)
   -> );

现在，您可以使用insert命令在表中插入一些记录。查询如下-

mysql> insert into Employee_Information(EmployeeName,EmployeeSalary,EmployeeStatus) values('Sam',17650,'FullTime');

mysql> insert into Employee_Information(EmployeeName,EmployeeSalary,EmployeeStatus) values('Carol',12000,'Trainee');

mysql> insert into Employee_Information(EmployeeName,EmployeeSalary,EmployeeStatus) values('Bob',17650,'FullTime');

mysql> insert into Employee_Information(EmployeeName,EmployeeSalary,EmployeeStatus) values('Mike',12000,'Trainee');

mysql> insert into Employee_Information(EmployeeName,EmployeeSalary,EmployeeStatus) values('John',17650,'FullTime');

使用select语句显示表中的所有记录。

mysql> select *from Employee_Information;

以下是输出-

+------------+--------------+----------------+----------------+
| EmployeeId | EmployeeName | EmployeeSalary | EmployeeStatus |
+------------+--------------+----------------+----------------+
|          1 | Sam          |          17650 | FullTime       |
|          2 | Carol        |          12000 | Trainee        |
|          3 | Bob          |          17650 | FullTime       |
|          4 | Mike         |          12000 | Trainee        |
|          5 | John         |          17650 | FullTime       |
+------------+--------------+----------------+----------------+
5 rows in set (0.00 sec)

以下是将变量传递给MySQL脚本的查询-

mysql> set @EmpStatus − = 'FullTime';

mysql> update Employee_Information set EmployeeSalary = EmployeeSalary+6500 where EmployeeStatus = @EmpStatus;
Rows matched − 3 Changed − 3 Warnings − 0

现在，使用SELECT语句再次检查表记录。对于工作于FullTime的员工，我已将EmployeeSalary增加了6500。

查询如下-

mysql> select *from Employee_Information;

以下是输出-

+------------+--------------+----------------+----------------+
| EmployeeId | EmployeeName | EmployeeSalary | EmployeeStatus |
+------------+--------------+----------------+----------------+
|          1 | Sam          |          24150 | FullTime       |
|          2 | Carol        |          12000 | Trainee        |
|          3 | Bob          |          24150 | FullTime       |
|          4 | Mike         |          12000 | Trainee        |
|          5 | John         |          24150 | FullTime       |
+------------+--------------+----------------+----------------+
5 rows in set (0.00 sec)

如何将变量传递给MySQL脚本？

热门推荐

随机推荐