cmd.ExecuteNonQuery value of i integer is going -1 from 0

问题

Here i create table in database dynamically. User enters name as his wish and selects language radiobutton. So problem is after executing cmd.ExecuteNonQuery value of i integer is going -1 from 0. And shows that table couldnt be created but when i go to database its already created successfully. Please let me know where i am doing wrong. Thanx in Advance !!

protected void btnpaper_Click(object sender, EventArgs e)
    {
        try
        {                
                string conn = ConfigurationManager.ConnectionStrings["sqlconn"].ConnectionString;
                SqlConnection con = new SqlConnection(conn);
                con.Open();
                char[] arr = new char[] {'n','g','l','i','s','h'};
                string str = "CREATE TABLE " + Label1.Text.Trim() + 
                             txtpaperset.Text.Trim()+ rbtnEng.Text.TrimEnd(arr) +
                             "(" + "quesNo int NOT NULL PRIMARY KEY, " + 
                             "question varchar(1000) NOT NULL," + 
                             "ansA varchar(500) NOT NULL, " + 
                             "ansB varchar(500) NOT NULL, " + 
                             "ansC varchar(500) NOT NULL, " + 
                             "ansD varchar(500) NOT NULL, " + 
                             "rightAns varchar(50) NOT NULL " + ")";                    
                SqlCommand cmd = new SqlCommand(str, con);
                int i = cmd.ExecuteNonQuery();
                if (i > 0)
                {
                    lblerrormsg.Visible = true;
                    con.Close();
                }
                else
                {
                    lblerrormsg.Text = "Table Not Created Please Try with Different Name!";                        
                    con.Close();
                }                

        }
        catch (System.Exception excep)
        {
            MessageBox.Show(excep.Message);
        }      
    }

回答1:

Takes from MSDN Remarks on SqlCommand.ExecuteNonQuery

For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. When a trigger exists on a table being inserted or updated, the return value includes the number of rows affected by both the insert or update operation and the number of rows affected by the trigger or triggers. For all other types of statements, the return value is -1. If a rollback occurs, the return value is also -1.

回答2:

From the docs for SqlCommand.ExecuteNonQuery (emphasis mine):

For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. When a trigger exists on a table being inserted or updated, the return value includes the number of rows affected by both the insert or update operation and the number of rows affected by the trigger or triggers. For all other types of statements, the return value is -1. If a rollback occurs, the return value is also -1.

Is your statement an UPDATE, INSERT or DELETE statement? Nope. Hence you're getting -1.

It's not clear what you mean by the value of i going to -1 "from" 0. It's never 0. It doesn't have a value until it's assigned one from the result of ExecuteNonQuery.

回答3:

Is it by design?

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executenonquery.aspx

and also:

cmd.executenonquery is returning -1 in vb.net windows application

You are saying you're getting -1, correct?

edit: to answer the last part of your question, see this:

Check if table exists in SQL Server

回答4:

Public Shared Function Insert(ByVal SProcedure As String, ByVal parameters() As SqlParameter) As Boolean Using cnn As New SqlConnection(Emplooyes) Try

            Dim cmd As SqlCommand = New SqlCommand(SProcedure, cnn)
            cmd.CommandType = CommandType.StoredProcedure
            cmd.Parameters.AddRange(parameters)

            If cnn.State = ConnectionState.Closed Then
                cnn.Open()
            End If

            Dim Ls As Integer
            Ls= cmd.ExecuteNonQuery()
            If Ls = -1 Then
                Return False
            Else
                Return True
            End If

        Catch ex As Exception
            Return False
        Finally
            cnn.Close()
        End Try
    End Using
End Function

来源：https://stackoverflow.com/questions/11619919/cmd-executenonquery-value-of-i-integer-is-going-1-from-0