如何修复操作数类型冲突：图像在SQL Server中与varchar（max）不兼容

Question

I have created a user defined type (with script to CREATE) given below:

CREATE TABLE [dbo].[EmployeeMasters](
[ID] [int] IDENTITY(1,1) NOT NULL,
[EmployeeID] [varchar](max) NOT NULL,
[EmployeeFName] [varchar](max) NOT NULL,
[EmployeeLName] [varchar](max) NOT NULL,
[Photo] [image] NOT NULL)

On the same database I have created a procedure that uses this type:

create PROCEDURE EmpQuli_INSERT @EmployeeID varchar(Max),@EmployeeFName VARCHAR(MAX), @EmployeeLName VARCHAR(MAX),@Photo IMAGE AS BEGIN DECLARE @NEWID VARCHAR(10);  

DECLARE @PREFIX VARCHAR(MAX);

SET @PREFIX = UPPER(SUBSTRING('STR',1, 3)) SELECT @NEWID = (@PREFIX + replicate('0', 3 -len(CONVERT(VARCHAR,N.OID + 1))) + CONVERT(VARCHAR,N.OID + 1)) FROM (SELECT CASE WHEN MAX(T.TID) IS null then 0 else MAX(T.TID) end as OID FROM (SELECT SUBSTRING(EmployeeID, 3, 1) as PRE_FIX,SUBSTRING(EmployeeID, 3, LEN(EmployeeID))as TID FROM EmployeeMasters) AS T WHERE T.PRE_FIX = @PREFIX) AS N
insert into EmployeeMasters values(@NEWID,@EmployeeFName, @EmployeeLName,  @Photo);
 end

And I try to insert a value in c# I getting operand type clash : image is incomplate with varchar(max) in sql server The c# code is:

EmployeeFName.Value = textBox_emp_Fname.Text;
EmployeeLName.Value = textBox_emp_Lname.Text;
Photo.Value =img_arr1;

AddEmployee.CommandText = "EmpQuli_INSERT @EmployeeFName, @EmployeeLName, @Photo";

I don't know who to fix it. Please help me because I have to submit my final year project on June first week but now I struggle this exception please help....

Answer 1

You're missing a column in your insert statement:

insert into EmployeeMasters values(@NEWID,@EmployeeFName, @EmployeeLName,  @Photo);

EmployeeID is missing, so @Photo tries to save into @EmployeeLName , which is incompatible. Even if it weren't, you'd still be missing EmployeeID , which is NOT NULL .

I'd suggest using the explicit insert syntax instead of relying on the auto-supplied columns:

insert into EmployeeMasters(EmployeeID, EmployeeFName, EmployeeLName, Photo)
  values (@NewID, @EmployeeFName, @EmployeeLName, @Photo);