Handling SQL Exception

Nov 14, 2007

I'm unsure how to handle an SQL Exception correctly when the database is unavailable/offline.

I have my aspx file with the C# code-behind, but all of the SQL stuff is done in a separate code file in the App_Code directory.
E.g.

CODE-BEHIND
DatabaseModifier.deleteUser(username);

DATABASEMODIFIER.cs
public static void deleteUser(string username)
{
   SqlConnection conn = SqlLogin.SqlConnect;
   SqlCommand command = new SqlCommand("DELETE FROM <table> WHERE Username = '" + username + "'", conn);
   conn.Open()
   command.ExecuteNonQuery();
   conn.Close()
}

Now, that code works perfectly, however if the database I'm connecting to is offline, an SQLException is thrown and because the SQL is handled in my DatabaseModifier class, I'm not sure how to handle it correctly.
If I use a Try/Catch block in my code-behind, it doesn't get thrown because the error occurs in my DatabaseModifier class. If I use a Try/Catch block in my DatabaseModifier class, what can I put in the catch block that will inform the user of the database being offline and/or how can I perform a url redirection?

Any help is greatly appreciated.

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Exception Handling

Sep 7, 2007

it gives error while calling a sql stored procedure as "INPUT STRING WAS NOT IN A CORRECT FORMAT". I am providing the code here.public void get_issid(string cse_email, string tech_email, string subject, string issue_details, string response, string solv_date, out int issid)
{
// Establish ConnectionSqlConnection oConnection = GetConnection();
// build the commandSqlCommand oCommand = new SqlCommand("get_issid", oConnection);
oCommand.CommandType = CommandType.StoredProcedure;
// ParametersSqlParameter paracse_email = new SqlParameter("@cse_email", SqlDbType.VarChar, 50);
paracse_email.Value =cse_email;
oCommand.Parameters.Add(paracse_email);
 SqlParameter paratech_email = new SqlParameter("@tech_email", SqlDbType.VarChar,50);
paratech_email.Value = cse_email;
oCommand.Parameters.Add(paratech_email);SqlParameter parasubject = new SqlParameter("@subject", SqlDbType.VarChar, 50);
parasubject.Value = subject;
oCommand.Parameters.Add(parasubject);SqlParameter paraissue_details = new SqlParameter("@issue_details", SqlDbType.VarChar, 500);
paraissue_details.Value = issue_details;
oCommand.Parameters.Add(paraissue_details);SqlParameter pararesponse = new SqlParameter("@response", SqlDbType.VarChar, 500);
pararesponse.Value = response;
oCommand.Parameters.Add(pararesponse);SqlParameter parasolv_date = new SqlParameter("@solv_date", SqlDbType.DateTime);
parasolv_date.Value = solv_date;
oCommand.Parameters.Add(parasolv_date);SqlParameter paraissid = new SqlParameter("@issid", SqlDbType.Int);paraissid.Direction = ParameterDirection.Output;
oCommand.Parameters.Add(paraissid);
try
{
oConnection.Open();
oCommand.ExecuteNonQuery();issid = int.Parse(paraissid.Value.ToString());
}catch (Exception oException)
{throw oException;
}
finally
{
oConnection.Close();
}
}
 
 
the stored procedure is:
 
create proc [dbo].[get_issid](@tech_email varchar(50), @cse_email varchar(50),@subject varchar(50),@issue_details varchar(500),@response varchar(500),@solv_date datetime, @issid int output)
as
select @issid=tech_response.issue_id from tech_response,issue_details where tech_response.tech_email=@tech_email and tech_response.cse_email=@cse_email and tech_response.subject=@subject and tech_response.issue_details=@issue_details and response=@response and solv_date=@solv_date and tech_response.issue_id=issue_details.issue_id
requested to help in this

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Apr 18, 1999

Hi,
Im Nithyananda working on a project with SQL server 6.0
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I would like to replace this error with my own.Could u tell me how to do it?
Im an ORACLE guy and relatively new to SQL server.
Is it possible for me to propogate the same error message to any front end?
In my case ,Im using VC++ as front end.
Could someone also tell me the way of calling a SQL stored procedure from
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Aug 22, 2007

Hi All

I m new to the sqlserver.In Oracle we can handle exceptions like this

declare
name varchar(20);
begin
select ename into name from emp where eno=&eno;
dbms_output.put_line(name);
exception
when no_data_found then
dbms_output.put_line('No Entry');
end;
/

We will get the message No Entry When corrsponding employee number dosent exists.

In Sqlserver how to handle these things.

Specifically my requirement is with select statement(Like above program)

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Sep 24, 2007



Hello,
I am trying to catch an error, but not able to. I am storing the value of @@Error soon after the statement which I believe would generate error. In order to produce the error I have deliberately used a wrong table name. So, the statement breaks but never comes to my error handling code snippet. Instead, it just throws the SQL server error message and quits. What am I doing wrong here? Here is the code snippet. The actual name of the temporary table is #TEMPO_TABLE, but in order to generate the error I have used #TEMPO_. Since this would surely error out, it should go to the label ROLLITBACK. But is not going to that label. Neither is it printing the error number as per the PRINT statement there. It just throws the SQL error and quits the execution. (Or should it NOT??). The Error that it throws it this:

Server: Msg 208, Level 16, State 1, Procedure FEED_PULL_XX, Line 157
Invalid object name '#TEMPO_'.

Can you please let me know whats going wrong here? Thanks a lot in advance.

INSERT INTO Table1
(
[ITAM_ASSET_EUP_BUS_LINE],
[ITAM_MACHINE_STATUS],
[ITAM_OWNER_ID],
[ITAM_ASSET_ADMIN],
[ITAM_MODEL],
[ITAM_ASSET_NAME],
[ITAMMACHINE_PURPOSE]
)
SELECT
[ITAM_ASSET_EUP_BUS_LINE],
[ITAM_MACHINE_STATUS],
[ITAM_OWNER_ID],
[ITAM_ASSET_ADMIN],
[ITAM_MODEL],
[ITAM_ASSET_NAME],
[ITAMMACHINE_PURPOSE]
FROM
#TEMPO_

SET @ErrNo = @@Error
PRINT '@ErrNo is ' + ltrim(str(@ErrNo)) + '.'
IF @ErrNo <> 0
Begin
PRINT '@ErrNo is ' + ltrim(str(@ErrNo)) + '.'
GOTO ROLLITBACK
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Jun 17, 2006

I need help please....

I am using exception handling and Transaction handling combined.
The code is written to delete a record from 2 different table.
The purpose of using exception and transaction handling combined is to
make sure that the record is deleted in BOTH table. If there is error
while deleting a record from one of the tables, it will rollback the
database to the original and will stop deleting any record.

However, The Transaction handling is not working. When error occurs
while deleting a record on table A, the code still delete a record from
one table B. The transaction.RollBack() doesn't work. This is my code:

        Try
            Conn
= New
SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)
            Conn.Open()
            Trans = sConn.BeginTransaction

            For Each row In GridView1.Rows                   
Dim sql As String = "SELECT * FROM Member
                   
Using Cmd As New SqlCommand(sql, Conn, Trans)                       
SqlDataSource1.DeleteParameters("MemberID").DefaultValue =
DropDownListMember.SelectedValue
                       
SqlDataSource1.Delete()
                       
SqlDataSource2.DeleteParameters("CarID").DefaultValue =
DropDownListCar.SelectedValue
                       
SqlDataSource2.Delete()
                    End Using
                End If
            Next
            sTrans.Commit()
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        Catch ex As Exception
            If sTrans IsNot Nothing Then
                sTrans.Rollback()
            End If
            Label1.Text = "error"
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        Finally
            If sConn IsNot Nothing Then
                sConn.Close()
            End If
        End Try


soo much thanks in advanced!!!

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Hi guys,
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Hi,

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Here's my code, your help is much obliged. (my error proc is below the caller)

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@stat_type_id int,
@stat_delimited_file_id smallint,
@time_interval datetime,
@call_volume int,
@Err int OUTPUT
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(
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stat_delimited_file_id,
ssda_customer_id,
time_interval,
call_volume
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VALUES
(
@stat_type_id,
@stat_delimited_file_id,
NULL,
@time_interval,
@call_volume
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SET @Error = @@ERROR
IF(@Error <> 0)
BEGIN
GOTO abort
END
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abort:
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/*ERROR PROC*/

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@SQLErrorID int,
@ObjectName varchar(50)
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BEGIN TRANSACTION
INSERT INTO [dbo].[OSAUTOREPORTS_ERROR_LOG]
(
error_id,
error_description,
object_name
)
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@SQLErrorID,
@SQLErrDescription,
@ObjectName
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The procedure I am writing to raiserror

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and i m getting the following result
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END TRY
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select ERROR_MESSAGE();
END CATCH;
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its giving me following error

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My table has 4 columns (i have since changed my FavoriteAccount datatype from bit to Integer)
http://i85.photobucket.com/albums/k71/Scionwest/table.jpg

Account type will either be "Checking" or "Savings" when a new row is added, the user will select what they want from a combo box.

Next is a snap shot of my startup form.
http://i85.photobucket.com/albums/k71/Scionwest/form.jpg



Where it says "Favorite Account: None" in the top panel, I am using a link label. When a user clicks "None" it will go to a account creation wizard, and set the first account as it's primary/favorite. As more accounts are added the user can select which will be his/her primary/favorite. For now I am just creating a sample account when the label is clicked in an attempt to get something working. Below is the code used.


private void lnkFavoriteAccount_Click(object sender, EventArgs e)

{

FinancesDataSet.BankAccountRow account = this.financesDataSet.BankAccount.NewBankAccountRow();

account.Name = "MyBank Checking Account";

account.AccountType = "Checking";

account.Balance = Convert.ToDecimal("15.03");

account.FavoriteAccount = 1;//datatype is an integer, I have changed it since I took the screenshot.

financesDataSet.BankAccount.Rows.Add(account);
//The next three lines where added while I was trying to get this to work.
//I don't know if I really need them or not, I receive the error regardless if these are here or not.



this.bankAccountTableAdapter1.Update(financesDataSet);

this.financesDataSet.AcceptChanges();

refreshDatabase();

}


the refreshDatabase() code is here:


private void refreshDatabase()

{

this.bankAccountTableAdapter1.Fill(this.financesDataSet.BankAccount);

//Aquire a count of accounts the user has

int numAccounts = financesDataSet.BankAccount.Count;

//Loop through each account and see which one is the primary.

for (int num = 0; num != numAccounts; num++)

{
//Works ok in frmMain_Load, but when my lnkFavoriteAccount_click calls this, it throws the error.

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{
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this.lnkFavoriteAccount.Text = this.financesDataSet.BankAccount[num].Name.ToString();

this.lnkFavoriteFunds.Text = this.financesDataSet.BankAccount[num].Balance.ToString();

break;

}

}

}


and my form_load code

private void frmMain_Load(object sender, EventArgs e)

{

refreshDatabase();

}


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[global:ystem.Diagnostics.DebuggerNonUserCodeAttribute()]

public byte FavoriteAccount {

get {

try {

return ((byte)(this[this.tableBankAccount.FavoriteAccountColumn]));

}

catch (global:ystem.InvalidCastException e) {
//Stops at the following line, this error was caused by 'if (this.financesDataSet.BankAccount[num].FavoriteAccount == 1)'

throw new global:ystem.Data.StrongTypingException("The value for column 'FavoriteAccount' in table 'BankAccount' is DBNull.", e);

}

}

set {

this[this.tableBankAccount.FavoriteAccountColumn] = value;

}

}


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if (this.financesDataSet.BankAccount[num].FavoriteAccount == 1)

in my refreshDatabase() method it still failed.

When I look, the data has been added into the database, it's just when I try to retreive it now, it bails on me. Am I retreiving the information wrong?

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36 CMLdataSource.InsertParameters.Add("ECPNum", EcpNumTextBox.Text)
37 CMLdataSource.InsertParameters.Add("[Class 1]", Class1TextBox.Text)
38 CMLdataSource.InsertParameters.Add("[Class 2]", Class2TextBox.Text)
39
40 Dim RowsAffected As Integer = 0
41
42 Try
43 RowsAffected = CMLdataSource.Insert()
44 Catch ex As Exception
45 CMLdataSource = Nothing
46 Server.Transfer("dberror.aspx")
47 Finally
48 CMLdataSource = Nothing
49 End Try
50
51
52 If RowsAffected <> 1 Then
53
54 Server.Transfer("dbError.aspx")
55
56 Else
57 Server.Transfer("newConfirm.aspx")
58
59 End If
60
61
62 End Sub
 

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