In the project I still making I’m using MySQL database to storing items. We can remove items from database. How to remove item from MySQL via Visual Basic?
Attention! This post has been published on my old website that has been down. I’m archiving old not verified posts for possible future use. Please be careful when using this post content.
In order to remove item from MySQL table following query has to be used:
DELETE FROM TableName WHERE DB_ColumnName='YourRecord';
Following code is consisted of:
- MySqlConnection – connection to MySQL database,
- MySqlDataAdapter – query to MySQL,
- Try – trying open connection,
- Exception – error handling.
Whole code to connect MySQL database and remove some item:
Imports MySql.Data.MySqlClient Public Sub UsunLokacje() ' Item removing from MySQL database Dim dTableCount As Long Dim dTable1 As New DataTable '1. Connection data '------------------------------------- Dim conn As MySqlConnection = New MySqlConnection() ' forgot source conn.ConnectionString = "Data Source=" & fmMain.txtMYSQLpath.Text & "; Database=" & fmMain.txtOPCJEnazwaMYSQL.Text & _ "; Uid=root; Pwd=" & fmMain.txtOPCJEhasloMYSQL.Text & ";" Try conn.Open() ' open connection Try ' Checking if item is in table ' ----------------------------------------- Dim adapter As MySqlDataAdapter = New MySqlDataAdapter("SELECT * FROM nazwylokacji WHERE Lokacja='" & _ fmMain.txtOPCJETornadoLokacja.Text & "';", conn) adapter.Fill (dTable1) dTableCount = dTable1.Rows.Count If dTableCount > 0 Then ' Item removing ' --------------------------------- Dim cmd1 As MySqlCommand = New MySqlCommand("DELETE FROM nazwylokacji WHERE Lokacja='" & _ fmMain.txtOPCJETornadoLokacja.Text & "';", conn) cmd1.ExecuteNonQuery() 'usuwanie wartości z MySQL cmd1 = Nothing conn.Close() ' Confiramtion for user ' ------------------------------------------------- MsgBox("Location '" & fmMain.txtOPCJETornadoLokacja.Text & "' has been removed.", vbInformation, "Confirmation...") Else MsgBox("Location can't be removed: '" & fmMain.txtOPCJETornadoLokacja.Text & "'.", vbCritical, "Error...") End If Catch ex1 As Exception MsgBox("Error when location removing. Table: 'nazwylokacji'." + Chr(10) + Chr(10) + "Err no.:" + Chr(10) + ex1.Message, _ MsgBoxStyle.Critical, "Error...") End Try Catch ex As Exception MsgBox("Database connection problem. Table: 'nazwylokacji'." + Chr(10) + Chr(10) + "Kod błedu:" + Chr(10) + ex.Message, _ MsgBoxStyle.Critical, "Conenction error...") conn.Close() Finally conn.Dispose() fmMain.txtOPCJETornadoLokacja.Clear() Call modDBgrid.IloscTornado ' DataGridView refresh End Try End Sub
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