How Do I Update The Primary Key(Positionnumber)All The Other Columns Get Updated Except Position Number

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Button

C#

Business_Logic.Employee objpo = new Business_Logic.Employee();
   objpo.Position_Number = TxtPositionNum.Text;
   objpo.Grade = TxtGrade.Text;
   objpo.StartDate = Txtstartda.Text;

   objpo.UpdatePosition(LblPositNum.Text);

Business Logic

C#

     public void UpdatePosition(string Position_Number)
       {

                    csDAL objdal = new csDAL();
           List<csparameterlisttype>objl = new List<csparameterlisttype>();
          
 objl.Add(new csParameterListType("@Position_Number", SqlDbType.VarChar, Position_Number));
           
objl.Add(new csParameterListType("@Grade", SqlDbType.VarChar, Grade));
           
objl.Add(new csParameterListType("@StartDate", SqlDbType.VarChar, StartDate));
                  
  objdal.executespreturnds("Update_Position", objl);
       }

SQL

Create procedure [dbo].[Update_Position]
(@Position_Number char(15),
@Grade varchar(5),
@StartDate varchar(1000)
)
as update PositionInformation set Position_Number=@Position_Number,Grade = @Grade,StartDate =@StartDate 
where Position_Number=@Position_Number

Posted 28-Jul-15 20:27pm

Member 11158507

Updated 28-Jul-15 20:33pm

Wendelius

v4

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Wendelius · Answer 1 · 2015-07-28T20:36:00

You would need to use two parameters for te position number, the old one and the new one. COnsider the following:

SQL

Create procedure [dbo].[Update_Position]
(@Position_Number_old char(15),
@Position_Number_new char(15),
@Grade varchar(5),
@StartDate varchar(1000)
)
as 
update PositionInformation 
set Position_Number=@Position_Number_new,
    Grade = @Grade,
    StartDate =@StartDate 
where Position_Number=@Position_Number_old

But before jumping to that, in my opinion, you should really modify the parameter types and column types correspondingly. Never store dates or number in character types. Instead use proper types such as date, int, float .

Patrice T · Answer 2 · 2015-07-28T21:01:00

Solution 2

By principle, a primary key should never change because the value does not matter. What matters is that the value is unique to each record and it is used as link between bases.

Posted 28-Jul-15 21:01pm

Patrice T