Query/IQuery.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;



namespace ComLib.Data
{
    /// <summary>
    /// Interface for query.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public interface IQuery<T> : IQuery
    {
        /// <summary>
        /// Adds a condition to the query.
        /// </summary>
        /// <param name="exp">Expression to extract field name.</param>
        /// <param name="comparison">Comparison expression.</param>
        /// <param name="val">Value to compare against.</param>
        /// <returns>Instance of implementation class used.</returns>
        IQuery<T> AddCondition(Expression<Func<T, object>> exp, ExpressionType comparison, object val);


        /// <summary>
        /// Adds columns to a select statement.
        /// </summary>
        /// <param name="colExpressions">Expressions to retrieve column names.</param>
        /// <returns>Instance of implementation class used.</returns>
        IQuery<T> Select(params Expression<Func<T, object>>[] colExpressions);


        /// <summary>
        /// Adds a WHERE clause to the query.
        /// </summary>
        /// <param name="exp">Expression to retrieve property name.</param>
        /// <returns>Instance of implementation class used.</returns>
        IQuery<T> Where(Expression<Func<T, object>> exp);


        /// <summary>
        /// Adds an AND condition to the query.
        /// </summary>
        /// <param name="exp">Expression to retrieve property name.</param>