I want to take users input as parameter to delete certain record from my firebird db.
So I have following code
private void btnOk_Click(object sender, EventArgs e)
{
string code = txtDeleteField.Text;
string connString = ConfigurationManager.AppSettings["DemoAppConnectionString"];
using (FbConnection conn = new FbConnection(connString))
{
using (FbCommand cmd = new FbCommand())
{
cmd.CommandText = "DELETE * FROM DEMOAPP WHERE CODE= @P1";
cmd.Parameters.AddWithValue("@P1", code);
cmd.Connection = conn;
conn.Open();
cmd.Transaction = conn.BeginTransaction();
int a = cmd.ExecuteNonQuery();
if (a == 0)
{
MessageBox.Show("Error!");
}
else
{
MessageBox.Show("Record deleted, ok!" );
}
}
}
}
This code produces error
An unhandled exception of type 'FirebirdSql.Data.FirebirdClient.FbException' occurred in FirebirdSql.Data.FirebirdClient.dll Additional information: Dynamic SQL Error SQL error code = -104 Token unknown - line 1, column 8 *
Your query is wrong, "DELETE * FROM DEMOAPP WHERE CODE= @P1"
is invalid: there should be no *
in a DELETE
statement.
Changing it to "DELETE FROM DEMOAPP WHERE CODE= @P1"
should fix the issue.
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