ntpa/Ntp.Data.Provider/PostgreeFactory.cs

//
// PostgreeFactory.cs
//
// Author:
//       Carsten Sonne Larsen <cs@innolan.dk>
//
// Copyright (c) 2016 Carsten Sonne Larsen
//
// 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.Text;
using System.Data.Common;
using Npgsql;

namespace Ntp.Data.Provider
{
    public sealed class PostgreeFactory : SqlDatabaseFactory
    {
        public PostgreeFactory ()
        {
        }

        // TODO: Change to PostgreSQL syntax
        private const string createDatabaseSql =
            "CREATE DATABASE IF NOT EXISTS {0};";

        // TODO: Change to PostgreSQL syntax
        private const string checkTableSql =
            "SELECT table_name " +
            "FROM information_schema.tables " +
            "WHERE table_schema = '{0}' " +
            "AND table_name = '{1}';";

        public override string PrepareCreateSql ()
        {
            return String.Format (createDatabaseSql, Config.Name);
        }

        public override string PrepareCheckTableSql (string table)
        {
            return String.Format (checkTableSql, Config.Name, table);
        }

        public override string PrepareCreateTableSql (string sql)
        {
            return String.Format (sql, String.Empty);
        }

        public override string PrepareInsertSql (string sql)
        {
            // TODO: Change to PostgreSQL syntax
            return String.Format (sql, "SELECT LAST_INSERT_ID()");
        }

        public override DbConnection CreateGenericConnection ()
        {
            return new NpgsqlConnection (BuildConnectionString (false));
        }

        public override DbConnection CreateConnection ()
        {
            return new NpgsqlConnection (BuildConnectionString ());
        }

        private string BuildConnectionString (bool includeName = true)
        {
            // TODO: Change to PostgreSQL connection string format
            StringBuilder b = new StringBuilder ();
            b.AppendFormat ("Host={0};", Config.Host);

            if (Config.Port != null)
                b.AppendFormat ("Port={0};", Config.Port);

            if (includeName)
                b.AppendFormat ("Database={0};", Config.Name);

            b.AppendFormat ("Username={0};", Config.User);
            b.AppendFormat ("Password={0};", Config.Pass);

            return b.ToString ();
        }

        public override DbCommand CreateCommand ()
        {
            return new NpgsqlCommand ();
        }

        public override DbParameter CreateParameter ()
        {
            return new NpgsqlParameter ();
        }

        public override DbParameter CreateParameter (string name, object value)
        {
            return new NpgsqlParameter (name, value);
        }
    }
}