The MySqlDataAdapter does not automatically generate the SQL statements required to reconcile changes made to a DataSet with the associated instance of MySQL. However, you can create a MySqlCommandBuilder object to automatically generate SQL statements for single-table updates if you set the SelectCommand property of the MySqlDataAdapter. Then, any additional SQL statements that you do not set are generated by the MySqlCommandBuilder.

The MySqlCommandBuilder registers itself as a listener for RowUpdating events whenever you set the DataAdapter property. You can only associate one MySqlDataAdapter or MySqlCommandBuilder object with each other at one time.

To generate INSERT, UPDATE, or DELETE statements, the MySqlCommandBuilder uses the SelectCommand property to retrieve a required set of metadata automatically. If you change the SelectCommand after the metadata has is retrieved (for example, after the first update), you should call the RefreshSchema method to update the metadata.

The SelectCommand must also return at least one primary key or unique column. If none are present, an InvalidOperation exception is generated, and the commands are not generated.

The MySqlCommandBuilder also uses the Connection, CommandTimeout, and Transaction properties referenced by the SelectCommand. The user should call RefreshSchema if any of these properties are modified, or if the SelectCommand itself is replaced. Otherwise the InsertCommand, UpdateCommand, and DeleteCommand properties retain their previous values.

If you call Dispose, the MySqlCommandBuilder is disassociated from the MySqlDataAdapter, and the generated commands are no longer used.

The following example uses the MySqlCommand, along MySqlDataAdapter and MySqlConnection, to select rows from a data source. The example is passed an initialized DataSet, a connection string, a query string that is a SQL SELECT statement, and a string that is the name of the database table. The example then creates a MySqlCommandBuilder.

Public Shared Function SelectRows(myConnection As String, mySelectQuery As String, myTableName As String) As DataSet Dim myConn As New MySqlConnection(myConnection) Dim myDataAdapter As New MySqlDataAdapter() myDataAdapter.SelectCommand = New MySqlCommand(mySelectQuery, myConn) Dim cb As SqlCommandBuilder = New MySqlCommandBuilder(myDataAdapter)

myConn.Open()

Dim ds As DataSet = New DataSet myDataAdapter.Fill(ds, myTableName)

' Code to modify data in DataSet here

' Without the MySqlCommandBuilder this line would fail. myDataAdapter.Update(ds, myTableName)

myConn.Close() End Function 'SelectRows
public static DataSet SelectRows(string myConnection, string mySelectQuery, string myTableName) { MySqlConnection myConn = new MySqlConnection(myConnection); MySqlDataAdapter myDataAdapter = new MySqlDataAdapter(); myDataAdapter.SelectCommand = new MySqlCommand(mySelectQuery, myConn); MySqlCommandBuilder cb = new MySqlCommandBuilder(myDataAdapter);

myConn.Open();

DataSet ds = new DataSet(); myDataAdapter.Fill(ds, myTableName);

//code to modify data in DataSet here

//Without the MySqlCommandBuilder this line would fail myDataAdapter.Update(ds, myTableName);

myConn.Close();

return ds; }

The value set is less than 0.
A value of 0 indicates no limit, and should be avoided in a ConnectionString because an attempt to connect will wait indefinitely.
The following example creates a MySqlConnection and sets some of its properties in the connection string. `Public Sub CreateSqlConnection() Dim myConnection As New MySqlConnection() myConnection.ConnectionString = "Persist Security Info=False;Username=user;Password=pass;database=test1;server=localhost;Connect Timeout=30" myConnection.Open() End Sub` `public void CreateSqlConnection() { MySqlConnection myConnection = new MySqlConnection(); myConnection.ConnectionString = "Persist Security Info=False;Username=user;Password=pass;database=test1;server=localhost;Connect Timeout=30"; myConnection.Open(); }`