如何在SQL Server

Question

插入特定的列我有Student考勤表，并具有类似

st_id | StudentName | month | year | day1 to day30 

列和，asp.net我使用。当我点击Present按钮时，数据库的cols应该插入st_id,StudentName,month,year的值，而一天应该是systemdate。日期应该在白天列在SQL输入和剩余的应该是空值

suppose if i enter the date today ie, 4 data will enter in day4 col like present 

http://i.stack.imgur.com/K7LwU.png

Answer 1

尝试这样

DECLARE @st_id int=1 
DECLARE @StudentName varchar(50)='dinesh' 
DECLARE @month varchar(50)='jan' 
DECLARE @year int=2014 

DECLARE @SQL nvarchar(MAX)= 'insert into 
(st_id, StudentName, month, year,day'+CAST(datepart(day,GETDATE()) as 
varchar(10))+') values 
('+CAST(@st_id as VARCHAR(MAX))+','''+@StudentName+''','''+ 
CAST(@month as VARCHAR(MAX)) 
+''','+CAST(@year as VARCHAR(10))+',''present'')' 
print @SQL 

使用步骤

Create procedure sp_insertStudents 
@st_id int, 
@StudentName varchar(50), 
@month varchar(50), 
@year int 
as 
BEGIN 


DECLARE @SQL nvarchar(MAX)= 'insert into 
(st_id, StudentName, month, year,day'+CAST(datepart(day,GETDATE()) as 
varchar(10))+') values 
('+CAST(@st_id as VARCHAR(MAX))+','''+@StudentName+''','''+ 
CAST(@month as VARCHAR(MAX)) 
+''','+CAST(@year as VARCHAR(10))+',''present'')' 
print @SQL 
EXEC(@SQL) 
END 

输出

insert into (st_id, StudentName, month, year,day4) values 
(1,'dinesh','jan',2014,'present')