protected override DataTable ReadTable(DataConnectionWrapper connection,
object[] restrictions, string sort)
{
DataTable dt = base.ReadTable(connection, restrictions, sort);
return(MySqlConnectionSupport.ConvertAllBinaryColumns(dt));
}
/// <summary>
/// Reads table with Database Objects which satisfy given restriction. Applies filter for aditional restriction
/// if MySQL version is less then 5.0.
/// </summary>
/// <param name="connection">The DataConnectionWrapper to be used for enumeration.</param>
/// <param name="restrictions">The restrictions to be putted on the retrieved objects set.</param>
/// <param name="sort">Sort expresion to append after ORDER BY clause.</param>
/// <returns>Returns table with Database Objects which satisfy given restriction.</returns>
protected override DataTable ReadTable(DataConnectionWrapper connection, object[] restrictions, string sort)
{
if (connection == null)
{
throw new ArgumentNullException("connection");
}
// Use base method to read table
DataTable first_result = base.ReadTable(connection, restrictions, sort);
// fixup collation names
DataTable result = MySqlConnectionSupport.ConvertAllBinaryColumns(first_result);
// If there is now result from bas, return immediately
if (result == null)
{
return(result);
}
// Extract server version
Version serverVersion = connection.ServerVersion;
// For latest version just call base
if (serverVersion == null || serverVersion.Major >= 5)
{
return(result);
}
// For legacy version apply restrictions to result manualy (first slot - character set name, third slot - flag is default)
// At first check if there is any restrictions
if (restrictions == null || restrictions.Length <= 0)
{
return(result);
}
if (String.IsNullOrEmpty(restrictions[0] as String) &&
(restrictions.Length < 3 || String.IsNullOrEmpty(restrictions[2] as String)))
{
return(result);
}
// Iterates through rows and filter them
foreach (DataRow collation in result.Select())
{
// Apply character set name filter
if (!String.IsNullOrEmpty(restrictions[0] as String) &&
!DataInterpreter.CompareInvariant(
restrictions[0] as String,
DataInterpreter.GetStringNotNull(collation, Attributes.CharacterSetName)))
{
collation.Delete();
continue;
}
// Apply is_default constraint
if (restrictions.Length >= 3 && !String.IsNullOrEmpty(restrictions[2] as String) &&
!DataInterpreter.CompareInvariant(
restrictions[2] as String,
DataInterpreter.GetStringNotNull(collation, Attributes.IsDefault)))
{
collation.Delete();
continue;
}
}
// Accept changes and return results
result.AcceptChanges();
return(result);
}