[英]How to dynamically provide column name and update the record in SQL Server?
I have a table like this我有一张这样的桌子
I want to store column name in varibale @myColumn
and then use Update
command.我想将列名存储在变量
@myColumn
中,然后使用Update
命令。 How can this be done?如何才能做到这一点? Is it possible?
可能吗?
DECLARE @myColumn varchar(20)
SET @myColumn = 'State'
UPDATE Country SET @myColumn = 'Florida' WHERE Id = 1
Yes, it's possible with some dynamic SQL.是的,有一些动态 SQL 是可能的。 If you have complete control in the process, you can try this solution:
如果你在这个过程中有完全的控制权,你可以试试这个解决方案:
Let's create a temp table to show:让我们创建一个临时表来显示:
create table #temp ([id] int, [state] varchar(10));
Insert into #temp
SELECT 1 as ID, null as [state]
select * from #temp
Now that's created, let's try现在已经创建好了,让我们试试
DECLARE @myColumn varchar(20), @sql varchar(400)
SET @myColumn = '[state]'
set @sql = CONCAT('Update #temp SET ',@myColumn ,'= ''FLORIDA'' where ID = 1')
exec(@sql)
Check the results检查结果
select * from #temp
If you don't have complete control over the process, you need to save your code from SQL Injection.如果您无法完全控制该过程,则需要从 SQL 注入中保存您的代码。
To dynamically use the name of a column you'll need Dynamic SQL.要动态使用列的名称,您需要 Dynamic SQL。
Here's an example:这是一个例子:
DECLARE @DynSql nvarchar(max), @DynParams nvarchar(max), @UpdateSql nvarchar(max), @UpdateParams nvarchar(max); DECLARE @myColumn varchar(20), @myColumnValue varchar(20), @myId INT; SET @UpdateSql = 'UPDATE Country '+CHAR(10) + 'SET [COLUMN] = @Value' + CHAR(10) + 'WHERE Id = @Id'; SET @UpdateParams = N'@Value varchar(20), @Id int'; SET @myColumn = 'State'; SET @myColumnValue = 'Florida'; SET @myId = 1; SET @DynSql = REPLACE(@UpdateSql, '[COLUMN]', QUOTENAME(@myColumn)); SET @DynParams = @UpdateParams; -- select @DynSql As DynSql; EXECUTE sp_executesql @DynSql, @DynParams, @Value = @myColumnValue, @Id = @myId;
1 rows affected1 行受影响
SELECT * FROM Country WHERE ID = 1;
ID ![]() |
CountryName![]() |
State ![]() |
---|---|---|
1 ![]() |
United States of America![]() |
Florida![]() |
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