Introduction
Solve the ability to configure connection to SQL Server by using app.config or any other means.
Using the code
For use only need to import System.Configuration.
This example gets the connectionstring of app.config for viewing and editing, creating a method in the client form.
Add section connectionStrings in app.config
<connectionStrings>
<add name="conn"
connectionString="Data Source=127.0.0.1;Initial Catalog=master; User Id=sa; Password=123456;Integrated Security=false"
providerName="System.Data.sqlclient" />
</connectionStrings>
Opens the specified client configuration file as a Configuration object.
Dim config As Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
Gets the ConnectionStringsSection data for the current application's default configuration.
Dim connectionString as String = config.ConnectionStrings.ConnectionStrings("conn").Connection
Save and refresh ConnectionString in current application's default configuration (app.config).
config.ConnectionStrings.ConnectionStrings("conn").ConnectionString = CS
config.Save(ConfigurationSaveMode.Modified)
ConfigurationManager.RefreshSection("connectionStrings")
Complete code form method client.
Public Function ConnectionDialog() As Boolean
Dim config As Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
Dim dialog As New SQLServerConnectionDialog()
dialog.ConnectionString = config.ConnectionStrings.ConnectionStrings("conn").ConnectionString
If dialog.ShowDialog = Windows.Forms.DialogResult.Cancel Then Return False
Dim CS As String = dialog.ConnectionString
config.ConnectionStrings.ConnectionStrings("conn").ConnectionString = CS
config.Save(ConfigurationSaveMode.Modified)
ConfigurationManager.RefreshSection("connectionStrings")
Return True
End Function
To get the list of SQL Server instances registered on the network:
Dim sqlSources As DataTable = SqlDataSourceEnumerator.Instance.GetDataSources
For Each datarow As DataRow In sqlSources.Rows
Dim datasource As String = datarow("ServerName").ToString
If Not datarow("InstanceName") Is DBNull.Value Then
datasource &= String.Format("\{0}", datarow("InstanceName"))
End If
cbServer.Items.Add(datasource)
Next
To get the list of databases on SQL Server:
Using cn As SqlConnection = New SqlConnection(connString)
cn.Open()
Using cmd As SqlCommand = New SqlCommand()
cmd.Connection = cn
cmd.CommandType = CommandType.StoredProcedure
cmd.CommandText = "sp_databases"
Using myReader As SqlDataReader = cmd.ExecuteReader()
While (myReader.Read())
cbDataBase.Items.Add(myReader.GetString(0))
End While
End Using
End Using
End Using
We build a connectionstring via object SqlConnectionStringBuilder.
Dim conn As New SqlConnectionStringBuilder()
conn.DataSource = "ServerName"
conn.IntegratedSecurity = False
conn.UserID = "sa"
conn.Password = "123456"
conn.InitialCatalog = "DBName"
