sqlserverprovider.cs

一种.net实现ajax方法的类库

/** Copyright (c) 2006, All-In-One Creations, Ltd.
*  All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
*     * Neither the name of All-In-One Creations, Ltd. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**/
/**
 * Project: emergetk: stateful web framework for the masses
 * File name: SQLiteProvider.cs
 * Description: SQLite Data Provider implementation.
 *   
 * Author: Ben Joldersma
 *   
 */

using System;
using System.Configuration;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Reflection;

namespace EmergeTk.Model
{
    public sealed class SqlServerProvider : DataProvider
    {
        private static readonly SqlServerProvider provider = new SqlServerProvider();

        private SqlServerProvider() { DataProvider.RegisterProvider(typeof(SqlServerProvider), this); }

        static public SqlServerProvider Provider { get { return provider; } }

        static public SqlConnection CreateConnection()
        {
            return new SqlConnection(ConfigurationSettings.AppSettings["sqlServerConnectionString"]);
        }

        T Execute<T>(string sql, SqlExecutionType mode, bool wrapTransaction) where T : class
        {
            SqlConnection conn = CreateConnection();
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            //SqlTransaction trans = null;
            //if( wrapTransaction ) trans = conn.BeginTransaction();
            cmd.CommandText = sql;
            T retVal = null;
            switch (mode)
            {
                case SqlExecutionType.Scalar:
                    retVal = (T)cmd.ExecuteScalar();
                    break;
                case SqlExecutionType.NonQuery:
                    cmd.ExecuteNonQuery();
                    break;
                case SqlExecutionType.Reader:
                    retVal = cmd.ExecuteReader() as T;
                    break;
                case SqlExecutionType.DataTable:
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    DataTable t= new DataTable();
                    da.Fill(t);
                    retVal = t as T;
                    break;
            }
            
            //if( wrapTransaction )trans.Commit();
            if (mode != SqlExecutionType.Reader)
            {
                cmd.Dispose();
                conn.Close();
                conn.Dispose();
            }
            //TODO: need to release resources after reader is complete.
            return retVal;
        }

        public object ExecuteScalar(string sql, bool wrapTransaction)
        {
            return Execute<object>(sql, SqlExecutionType.Scalar, wrapTransaction);
        }

        public void ExecuteNonQuery(string sql, bool wrapTransaction)
        {
            Execute<object>(sql, SqlExecutionType.NonQuery, wrapTransaction);
        }

        public SqlDataReader ExecuteReader(string sql, bool wrapTransaction)
        {
            return Execute<SqlDataReader>(sql, SqlExecutionType.Reader, wrapTransaction);
        }

        public DataTable ExecuteDataTable(string sql, bool wrapTransaction)
        {
            return Execute<DataTable>(sql, SqlExecutionType.DataTable, wrapTransaction);
        }

        public IRecordList<T> Load<T>() where T : AbstractRecord, new()
        {
            return Load<T>("","ROWID");
        }

        public IRecordList<T> Load<T>(params SortInfo[] sortInfos) where T : AbstractRecord, new()
        {
            return Load<T>(string.Empty, Util.Join(sortInfos));
        }

        public IRecordList<T> Load<T>(string whereClause, string orderByClause) where T : AbstractRecord, new()
        {
            return Load<T>(whereClause, orderByClause, false);
        }

        public IRecordList<T> Load<T>(string whereClause, string orderByClause, bool FastLoad ) where T : AbstractRecord, new()
        {
            if (whereClause != null && whereClause.Length > 0)
            {
                whereClause = " WHERE " + whereClause;
            }
            if (orderByClause != null && orderByClause.Length > 0)
            {
                orderByClause = " ORDER BY " + orderByClause;
            }
            RecordList<T> records = new RecordList<T>();
            Type type = typeof(T);
            string name = type.Name;
            if (!SqlServerRecord.TableExists(name))
                return records;

            string star = FastLoad ? ", *" : "";

            DataTable result = SqlServerProvider.Provider.ExecuteDataTable("SELECT ROWID" + star + " FROM " + name + whereClause + orderByClause, false);

            for (int i = 0; i < result.Rows.Count; i++)
            {
                T r;
                if( FastLoad )
                    r = SqlServerRecord.LoadFromDataRow<T>(result.Rows[i]);
                else
                    r = SqlServerRecord.Load<T>(Convert.ToInt32(result.Rows[i]["ROWID"]));

                records.Add(r);
            }

            return records;
        }

        public IRecordList<T> Load<T>(params FilterInfo[] filterInfos) where T : AbstractRecord, new()
        {
            return Load<T>(Util.Join(filterInfos), string.Empty);
        }

        public IRecordList<T> Load<T>(FilterInfo[] filterInfos, SortInfo[] sortInfos ) where T : AbstractRecord, new()
        {
            return Load<T>(Util.Join(filterInfos), Util.Join(sortInfos));
        }
    }
}