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How to stop insertion of duplicate Primary Key

Experts
I want to know how to stop the user entering the primary key as duplicate key.
I am not using the Identity Specification as YES , rather it is NO.
The PK value is coming from another table where the same attribute is PK .
For more information please see the image attached.
How to use the try catch block for that purpose .
Please tell me.
Thanking you,
Anindya
using (SqlConnection con1 = new SqlConnection(Connectionstring.Connection))
            {


                Int32 Opportunuty_ID = _Opportunuty_ID;
                string query1 = "insert into Table_OpportunityTechnology(Opportunuty_ID,TechID,SubTechID) values(@paramOpportunuty_ID,@paramTechID,@paramSubTechID)";
                using (SqlCommand cmd1 = new SqlCommand(query1, con1))
                {
                    cmd1.Parameters.AddWithValue("@paramOpportunuty_ID", Opportunuty_ID);
                    cmd1.Parameters.AddWithValue("@paramTechID", TechID);
                    cmd1.Parameters.AddWithValue("@paramSubTechID", SubTechID);
                    con1.Open();
                    SqlDataReader reader1 = cmd1.ExecuteReader();
                }
            }
        }

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1.JPG
error.JPG
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ANINDYA
Asked:
ANINDYA
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1 Solution
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
first of all: for a INSERT, don't use ExecuteReader, but ExecuteNonQuery function

apart from that, the Table_OpportunityTechnology should not have SubTechID as PK, but as FK, from what I understand?!
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DhaestCommented:
Try to catch it the first time, to see what exception number you get
using (SqlConnection con1 = new SqlConnection(Connectionstring.Connection))
            {


                Int32 Opportunuty_ID = _Opportunuty_ID;
                string query1 = "insert into Table_OpportunityTechnology(Opportunuty_ID,TechID,SubTechID) values(@paramOpportunuty_ID,@paramTechID,@paramSubTechID)";
                using (SqlCommand cmd1 = new SqlCommand(query1, con1))
                {
                    cmd1.Parameters.AddWithValue("@paramOpportunuty_ID", Opportunuty_ID);
                    cmd1.Parameters.AddWithValue("@paramTechID", TechID);
                    cmd1.Parameters.AddWithValue("@paramSubTechID", SubTechID);
                    con1.Open();
                    try
                    {
                         SqlDataReader reader1 = cmd1.ExecuteReader();
                    catch(SqlException ex)
                     {
                      if (!ex.ErrorCode == 0x80131904)
                              throw;
                      }
                }
            }
        }

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ANINDYAAuthor Commented:
Expert Dhaest
please see the error in the attached image .
I have used your code sir.
Thanking you,
Take regards.
Anindya
error.JPG
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DhaestCommented:
You need to place the errorcode here: ex.ErrorCode == 0x80131904

If you have message above, take a look at the value of ex.ErrorCode and use that one in the code
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soniethomasCommented:
Why don't you check if the row is there and insert if not present?
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ANINDYAAuthor Commented:
Sage angelIII
I do not know why the database designer is using that primary key there also.
As per him it is necessary.
I can not tell you anything more than that.

error.JPG
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
>As per him it is necessary.
I presume the designed requests "a" primary key.
please make sure you change that, I presume that the combination of several of the columns (aka the 3 FK columns) make up the PK.
if that is the case, select the 3 columns, and hit the PK icon, so all 3 columns get the icon of being primary key.
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ANINDYAAuthor Commented:
Expert Dhaest
Will you please tell me what is the meaning of the statement of yours
"take a look at the value of ex.ErrorCode and use that one in the code"
Does it means that it is system dependent of something else.
please explain sir.
Thanking you
Take regards
Anindya
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DhaestCommented:
I just gave an example, but I don't know which version of sql-server, sqllite, ... you are using
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ANINDYAAuthor Commented:
Expert Dhaest
I am using sql server 2005
Thanking you
Anindya
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DhaestCommented:
You can easily find the exception-number (or errorcode) by yourself by examining the ex-object in your immeadiatly or watch-window

Can you try with this:

try
                    {
                         SqlDataReader reader1 = cmd1.ExecuteReader();
                     }
                    catch(SqlException ex)
                     {
                      if (!ex.Number.Equals(2627))
                              throw;
                      }
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ANINDYAAuthor Commented:
Expert Dhaest
Thank you very much for the reply and the correct answer .
Sir I have a small request that is if you have a bit of time please glance upon the below question.
The url is
http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_26400189.html?cid=239#a33426981

Anyway thanking you,
Hope to get your assistance in future too.
Thanking you
Anindya Chatterjee
Bangalore
India
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