C＃Winforms控件-DataGridView-更新数据库

Question

The programs I am using are WAMP server (and its mysql feature in particular) and MS Visual Studio 2010 and I am programming in C#

Basically, here is what I need and can currently do with my application.

I have several datagridview 's throughout the project and the first is simple, it loads all data from a specific table in the database at the push of a button. I have another form which I can insert records and have somehow managed to make a delete function which asks the user for 2 fields (first name and last name) and then it places these into a query and carries out the command.

What do I need to do?

I need to be able to implement some way for the form to update the database. I have chosen to do this through a datagridview control so the user can see what they are editting whilst they edit it.

I have the following code which I have tried to update the database based on the data in the datagridview control.

string connString = "server=localhost;User Id=root;database=collegelist;";
MySqlConnection conn = new MySqlConnection(connString);
string selectSQL = "SELECT * FROM collegeemployee";
conn.Open();
MySqlDataAdapter da = new MySqlDataAdapter(selectSQL, conn);
MySqlCommandBuilder builder = new MySqlCommandBuilder(da);
DataTable table = new DataTable(); 
try
{
    dgView2.Rows.RemoveAt(dgView2.CurrentRow.Index);
    da.Update(table);
}
catch (Exception exceptionObj)
{
    MessageBox.Show(exceptionObj.Message.ToString());
}

the problem with this code (listed in a method obviously) is that while the grid is able to be modified, it is unable to pass the data back to the database.

Answer 1

Instead of updating your database with the empty table what you should do is. i.Get the datasource . like ii. Update/synchronize the data source and data adapter Here is the code it should work, if it doesn't please comment and tell me the problem.

string connString = "server=localhost;User Id=root;database=collegelist;";
MySqlConnection conn = new MySqlConnection(connString);
string selectSQL = "SELECT * FROM collegeemployee";
conn.Open();
MySqlDataAdapter da = new MySqlDataAdapter(selectSQL, conn);
MySqlCommandBuilder builder = new MySqlCommandBuilder(da);
    BindingSource BindingSourceToUpdate = (BindingSource)dgView2.DataSource; // because direct casting to data table was failing in VS2o1o

                 try
                {
    dgView2.Rows.RemoveAt(dgView2.CurrentRow.Index);

                    da.Update((DataTable)BindingSourceToUpdate.DataSource);
                }
                catch(exception)
                 {
                 }
conn.close();