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OdbcDbProvider.cs

//
// Provider/OdbcDbProvider.cs
//
// Authors:
//   Christian Hergert  <chris@mosaix.net>
//   Daniel Morgan <danielmorgan@verizon.net>
//
// Copyright (C) 2005 Mosaix Communications, Inc.
// Copyright (C) 2005 Daniel Morgan
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Collections;
using System.Data;
using System.Text;
using System.Text.RegularExpressions;

using System.Data.Odbc;

namespace Mono.Data.Sql
{
      /// <summary>
      /// Mono.Data.Sql provider for PostgreSQL databases.
      /// </summary>
      [Serializable]
00045       public class OdbcDbProvider : DbProviderBase
      {
            protected OdbcConnection connection = null;
            protected OdbcDataAdapter adapter = new OdbcDataAdapter();
            protected bool isConnectionStringWrong = false;
            
            /// <summary>
            /// Default Constructor
            /// </summary>
00054             public OdbcDbProvider () : base ()
            {
            }
            
            public override string ProviderName {
                  get {
                        return "Provider for ODBC Data Sources";
                  }
            }
            
            /// <summary>
            /// Constructor with ADO.NET ODBC connection.
            /// </summary>
00067             public OdbcDbProvider (OdbcConnection conn)
            {
                  connection = conn;
            }
            
            /// <summary>
            /// ADO.NET Connection
            /// </summary>
00075             public override IDbConnection Connection {
                  get {
                        if (connection == null)
                              connection = new OdbcConnection();
                        
                        return (IDbConnection) connection;
                  }
            }
            
            /// <summary>
            /// Connection String
            /// </summary>
00087             public override string ConnectionString {
                  get {
                        return Connection.ConnectionString;
                  }
                  set {
                        if (IsOpen == true)
                              Close();
                        
                        Connection.ConnectionString = value;
                        isConnectionStringWrong = false;
                  }
            }
            
            /// <summary>
            /// Is the connection open
            /// </summary>
00103             public override bool IsOpen {
                  get {
                        return Connection.State == ConnectionState.Open;
                  }
            }
            
            /// <summary>
            /// Is the last used connection string wrong
            /// </summary>
00112             public override bool IsConnectionStringWrong {
                  get {
                        return isConnectionStringWrong;
                  }
            }
            
            /// <summary>
            /// Open the connection. Returns true on success.
            /// </summary>
00121             public override bool Open()
            {
                  try {
                        Connection.Open();
                  } catch {
                        isConnectionStringWrong = true;
                  }
                  OnOpen ();
                  return IsOpen;
            }
            
            /// <summary>
            /// Close the database connection.
            /// </summary>
00135             public override void Close()
            {
                  Connection.Close();
                  OnClose();
            }
            
            /// <summary>
            /// Do we support the passed schema type
            /// </summary>
00144             public override bool SupportsSchemaType(Type type)
            {
                  if (type == typeof(TableSchema))
                        return true;
                  else if (type == typeof(ViewSchema))
                        return true;
                  else if (type == typeof(ProcedureSchema))
                        return true;
                  else if (type == typeof(AggregateSchema))
                        return true;
                  else if (type == typeof(GroupSchema))
                        return true;
                  else if (type == typeof(UserSchema))
                        return true;
                  else if (type == typeof(LanguageSchema))
                        return true;
                  else if (type == typeof(OperatorSchema))
                        return true;
                  else if (type == typeof(RoleSchema))
                        return true;
                  else if (type == typeof(SequenceSchema))
                        return true;
                  else if (type == typeof(DataTypeSchema))
                        return true;
                  else if (type == typeof(TriggerSchema))
                        return true;
                  else if (type == typeof(ColumnSchema))
                        return true;
                  else if (type == typeof(ConstraintSchema))
                        return true;
                  else if (type == typeof(RuleSchema))
                        return true;
                  else
                        return false;
            }
            
            /// <summary>
            /// Thread safe SQL execution.
            /// </summary>
00183             public override DataTable ExecuteSQL(string SQLText)
            {
                  try {
                        OdbcCommand command = new OdbcCommand();
                        command.Connection = connection;
                        command.CommandText = SQLText;

                        DataSet resultSet = new DataSet ();

                        lock(adapter) {
                              adapter.SelectCommand = command;
                              adapter.Fill(resultSet);
                        }

                        return resultSet.Tables[0];
                  } catch {
                        return null;
                  }
            }
            
            /// <summary>
            /// Get a list of tables in the system.
            /// </summary>
00206             public override TableSchema[] GetTables()
            {
                  if (IsOpen == false && Open () == false)
                        throw new InvalidOperationException ("Invalid connection");
                  
                  ArrayList collection = new ArrayList ();
                  // TODO:
                  return (TableSchema[]) collection.ToArray (typeof (TableSchema));
            }
            
            /// <summary>
            /// Get columns for a table.
            /// </summary>
00219             public override ColumnSchema[] GetTableColumns(TableSchema table)
            {
                  if (IsOpen == false && Open () == false)
                        throw new InvalidOperationException ("Invalid connection");
                  
                  ArrayList collection = new ArrayList();
                  // TODO:
                  return (ColumnSchema[]) collection.ToArray(typeof(ColumnSchema));
            }

            /// <summary>
            /// Get a collection of views from the system.
            /// </summary>
00232             public override ViewSchema[] GetViews()
            {
                  ArrayList collection = new ArrayList();
                  // TODO:
                  return (ViewSchema[]) collection.ToArray (typeof (ViewSchema));
            }
            
            /// <summary>
            /// Get a collection of columns within a view
            /// </summary>
00242             public override ColumnSchema[] GetViewColumns(ViewSchema view)
            {
                  if (IsOpen == false && Open() == false)
                        throw new Exception ("No connection to database");
                  
                  ArrayList collection = new ArrayList();
                  // TODO:                
                  
                  return (ColumnSchema[]) collection.ToArray (typeof(ColumnSchema));
            }
            
            /// <summary>
            /// Get a collection of constraints within a a table.
            /// </summary>
00256             public override ConstraintSchema[] GetTableConstraints (TableSchema table)
            {
                  if (IsOpen == false && Open () == false)
                        throw new InvalidOperationException ("Invalid connection");
                  
                  ArrayList collection = new ArrayList ();
                  // TODO:                
                  
                  return (ConstraintSchema[]) collection.ToArray (typeof(ConstraintSchema));
            }
            
            public override UserSchema[] GetUsers ()
            {
                  if (IsOpen == false && Open () == false)
                        throw new InvalidOperationException ("Invalid connection");
                  
                  ArrayList collection = new ArrayList ();
                  // TODO:                
                  return (UserSchema[]) collection.ToArray (typeof (UserSchema));
            }
            
            public override ProcedureSchema[] GetProcedures ()
            {
                  if (IsOpen == false && Open () == false)
                        throw new InvalidOperationException ("Invalid connection");
                  
                  ArrayList collection = new ArrayList ();
                  
                  // TODO:                
                  return (ProcedureSchema[]) collection.ToArray (typeof (ProcedureSchema)); 
            }
            
            public override ColumnSchema[] GetProcedureColumns (ProcedureSchema schema)
            {
                  if (IsOpen == false && Open () == false)
                        throw new InvalidOperationException ("Invalid connection");
                  
                  ArrayList collection = new ArrayList ();
                  // TODO:                                  
                  return (ColumnSchema[]) collection.ToArray (typeof (ColumnSchema));
            }
      }
}


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