如何使用存储过程将数据从datagridview Rows插入到vb.net中的mysql数据库

Question

Im stucked. I am trying to insert data from the grid to the database.But I'm stucked.

Answer 1

Slugsie's comment is pertinent, but needs to go a little further:

You're actually clearing the entire parameters collection before you call the procedure. If it were a house, you went to all the effort to build the whole thing, then at the last minute you demolish it and show the customer a cleared lot

Don't clear the Parameters collection at all. Add all the parameters to it OUTSIDE the loop, then inside the loop, set the values:

    'general pattern
    cmd.Parameters.AddWithValue("param1", "...")
    cmd.Parameters.AddWithValue("param2", "...")
    cmd.Parameters.AddWithValue("param3", "...")
    cmd.Parameters.AddWithValue("param4", "...")

    For Each something In somethingElse
      cmd.Parameters("param1").Value = something.Whatever1
      cmd.Parameters("param2").Value = something.Whatever2
      cmd.Parameters("param3").Value = something.Whatever3
      cmd.Parameters("param4").Value = something.Whatever4
      cmd.Execute...
    Next something

That's the pattern you should be adopting

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Though jmc also makes a useful comment; you could make your life a lot easier by

• adding a DataSet type file to your project
• open it, right click the surface, choose Add TableAdapter
• when configuring the wizard for the adapter, say you want to use stored procedures for your select, insert, update etc
• wire the procedures up to the relevant table columns

Now in code you can save data just by a single line or two:

Dim t as New WhateverTableAdapter
t.Update(yourWhateverDatatable) 'the WhateverDataTable is bound to a grid, the user has edited the rows in it by changing the grid

That Update() call will perform any necessary use of the Insert/Update/Delete procedures depending on if the datarow in the table is an Added, Modified or Deleted state