nvarchar is incompatible with image

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1.80/5 (2 votes)

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I am trying to insert the path of my image in a varchar field of the db butit's giving me the incompatibility error. Can anybody tell me what am I doing wrong

C#

private void button3_Click(object sender, EventArgs e)
{
    string p = path.ToString();
    string name = this.textBox1.Text.ToString();
    string description = this.richTextBox1.Text.ToString();
    //MessageBox.Show(p);
    DateTime da = DateTime.Now;
    string date = da.ToString("dd/MM/YYYY");
    string connString = @"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\Gardezi\Documents\Visual Studio 2012\Projects\homeWork2\homeWork2\Database1.mdf;Integrated Security=True";
    SqlConnection con = new SqlConnection(connString);
    string query = "insert into diaryDB(Title , Description , Date , pic) values (@name , @description ,@date , @p)";
    SqlCommand comm = new SqlCommand(query, con);
    comm.Parameters.Add(new SqlParameter("name" , name));
    comm.Parameters.Add(new SqlParameter("description", description));
    comm.Parameters.Add(new SqlParameter("date", date));
    comm.Parameters.Add(new SqlParameter("p",p ));
    con.Open();
    comm.ExecuteNonQuery();
    con.Close();
}

Posted 23-Nov-14 17:08pm

Syed Muhammad Ali Gardezi

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Comments

DamithSL 23-Nov-14 23:10pm

what is the error with stack trace?

Syed Muhammad Ali Gardezi 23-Nov-14 23:14pm

System.Data.SqlClient.SqlException (0x80131904): Operand type clash: nvarchar is incompatible with image
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at homeWork2.entry.button3_Click(Object sender, EventArgs e) in c:\Users\Gardezi\Documents\Visual Studio 2012\Projects\homeWork2\homeWork2\entry.cs:line 88
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, In

[no name] 23-Nov-14 23:26pm

What type of column is "pic". Also, what do you get in path.ToString() ?

Syed Muhammad Ali Gardezi 23-Nov-14 23:31pm

I have a path variable declared at class level. In it I save the path of the image and this path is stored in the pic colomun of the db which is of type varchar

[no name] 24-Nov-14 3:17am

What do you get in path.ToString(); ????
Is it the proper string that you are getting and stored in p ?

Syed Muhammad Ali Gardezi 24-Nov-14 14:13pm

I was getting a string before using Tostring but that was not working out for me so I said why not use toString. and yes thats a proper string that I am getting in p

PIEBALDconsult 23-Nov-14 23:35pm

It sounds like your column is of type image, not nvarchar.

Syed Muhammad Ali Gardezi 24-Nov-14 14:13pm

no ita varchar

PIEBALDconsult 24-Nov-14 14:21pm

The pic column?

Syed Muhammad Ali Gardezi 24-Nov-14 14:47pm

yes the pic column is varchar

PIEBALDconsult 24-Nov-14 14:50pm

Well then what about description? How about eliminating columns until you find which one is causing the trouble?

Syed Muhammad Ali Gardezi 24-Nov-14 16:16pm

Thank you for all the help. I found the problem.

PIEBALDconsult 24-Nov-14 16:17pm

And it was...?

Syed Muhammad Ali Gardezi 25-Nov-14 14:35pm

well I am quite ambarassed to say that I did'nt update the table after changing the image type to varchar

Richard MacCutchan 24-Nov-14 5:06am

Why do you call ToString on Text fields?

Syed Muhammad Ali Gardezi 24-Nov-14 14:13pm

I was getting a string before using Tostring but that was not working out for me so I said why not use toString.

[no name] 24-Nov-14 9:35am

.Text property is already a string, so no need to use tostring.

You should also consider a different method; this SO topic covers why.

http://stackoverflow.com/questions/3748/storing-images-in-db-yea-or-nay

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