ddepartment.cs

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using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
using Entities;
using Search;

namespace DAL.SqlServer
{
    public class DDepartment:IDDepartment
	{
	    #region 插入实体操作部份
	    /// <summary>
        /// 插入
        /// </summary>
		/// <param name="cmd">Command对象</param>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
		private int Insert(SqlCommand cmd, Department department)
		{
		    cmd.Parameters.Clear();
			cmd.CommandText = "insert into Department (Department_Name) values (@Department_Name)";
			//从实体中取出值放入Command的参数列表
            cmd.Parameters.Add(new SqlParameter("@Department_Name",department.DepartmentName));
            return cmd.ExecuteNonQuery();
		}
	    /// <summary>
        /// 不使用事务的插入方法
        /// </summary>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
	    public int Insert(Department department)
		{
		    int result=0;
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
		    using(SqlConnection conn=new SqlConnection(connectionString))
			{
				conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    result=Insert(cmd, department);
                }
			}
			return result;
		}
		
		/// <summary>
        /// 使用事务的插入方法
        /// </summary>
        /// <param name="connection">实现共享Command的对象</param>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Insert(IConnection connection,Department department)
        {
			SqlCommand cmd=connection.Command as SqlCommand;
            return Insert(cmd, department);
        }
		#endregion
		
		#region 删除实体操作
		
		/// <summary>
        /// 删除
        /// </summary>
		/// <param name="cmd">Command对象</param>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
		private int ExcuteDeleteCommand(SqlCommand cmd, Department department)
        {
			cmd.Parameters.Clear();
            cmd.CommandText = "delete Department where Department_ID=@Department_ID";
            //从实体中取出值放入Command的参数列表
		    cmd.Parameters.Add(new SqlParameter("@Department_ID", department.DepartmentID));
            return cmd.ExecuteNonQuery();
			
        }
		/// <summary>
        /// 不使用事务的删除方法
        /// </summary>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Delete(Department department)
        {
            int result = 0;
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
			using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
				
                    result=ExcuteDeleteCommand(cmd, department);
                }
            }
            return result;
        }
		
		/// <summary>
        /// 使用事务的删除方法
        /// </summary>
        /// <param name="connection">实现共享Command的对象</param>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Delete(IConnection connection,Department department)
        {
            int result = 0;
			SqlCommand cmd=connection.Command as SqlCommand;
            result =  ExcuteDeleteCommand(cmd, department);
            return result;
        }
		
		/// <summary>
        /// 根据查询对象构建过滤条件并使用事务的删除方法
        /// </summary>
        /// <param name="connection">实现共享Command的对象</param>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Delete(IConnection connection,DepartmentSearcher searcher)
        {
            int result = 0;
			string condition=string.Empty;
			SqlCommand cmd=connection.Command as SqlCommand;
			cmd.Parameters.Clear();
		    if(searcher.DepartmentIDIsValid)
			{
			    condition += " and Department_ID=@Department_ID";
		        cmd.Parameters.Add(new SqlParameter("@Department_ID",searcher.DepartmentID));
			}
		    if(searcher.DepartmentNameIsValid)
			{
			    condition += " and Department_Name=@Department_Name";
		        cmd.Parameters.Add(new SqlParameter("@Department_Name",searcher.DepartmentName));
			}
			if(condition!=string.Empty)
			{
				condition=" where "+condition;
			}
			cmd.CommandText="delete from  Department "+condition;
            result =  cmd.ExecuteNonQuery();
			
            return result;
        }
		/// <summary>
        /// 根据查询对象构建过滤条件并不使用事务的删除方法
        /// </summary>
        /// <param name="searcher">查询对象</param>
        /// <returns>影响的记录行数</returns>
        public int Delete(DepartmentSearcher searcher)
        {
            int result = 0;
			string condition=string.Empty;
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
			using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
		            if(searcher.DepartmentIDIsValid)
			        {
			            condition += " and Department_ID=@Department_ID";
		                cmd.Parameters.Add(new SqlParameter("@Department_ID",searcher.DepartmentID));
			        }
		            if(searcher.DepartmentNameIsValid)
			        {
			            condition += " and Department_Name=@Department_Name";
		                cmd.Parameters.Add(new SqlParameter("@Department_Name",searcher.DepartmentName));
			        }
			        if(condition!=string.Empty)
			        {
				        condition=" where "+condition;
			        }
                    cmd.CommandText="delete from  Department "+condition;
                    result =  cmd.ExecuteNonQuery();
                }
            }
            return result;
        }
		#endregion
		
		#region 更新实体操作
		
		/// <summary>
        /// 更新
        /// </summary>
		/// <param name="cmd">Command对象</param>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
		private int ExcuteUpdateCommand(SqlCommand cmd, Department department)
		{
		    cmd.CommandText = "update Department set Department_Name=@Department_Name where Department_ID=@Department_ID";
			//从实体中取出值放入Command的参数列表
            cmd.Parameters.Add(new SqlParameter("@Department_Name",department.DepartmentName));
			cmd.Parameters.Add(new SqlParameter("@Department_ID", department.DepartmentID));
            return cmd.ExecuteNonQuery();
		}
		
		/// <summary>
        /// 不使用事务的更新方法
        /// </summary>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
	    public int Update(Department department)
		{
		    int result=0;
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
			using(SqlConnection conn=new SqlConnection(connectionString))
			{
				conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    result=ExcuteUpdateCommand(cmd, department);
                }
			}
			return result;
		}
		/// <summary>
        /// 使用事务的更新方法
        /// </summary>
        /// <param name="connection">实现共享Command的对象</param>
        /// <param name="department">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Update(IConnection connection,Department department)
        {
            int result = 0;
			SqlCommand cmd=connection.Command as SqlCommand;
            result =  ExcuteUpdateCommand(cmd, department);
            return result;
        }
		/// <summary>
        /// 根据查询对象构建过滤条件并不使用事务的更新方法
        /// </summary>
        /// <param name="searcher">查询对象</param>
		/// <param name="newValues">要更新的新值</param>
        /// <returns>影响的记录行数</returns>
	    public int Update(DepartmentSearcher searcher,DepartmentSearcher newValues)
		{
		    int result=0;
			string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
			using(SqlConnection conn=new SqlConnection(connectionString))
			{
				conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
					//string updateString=GetUpdateString(cmd, newValues)+condition;
					string updateString = string.Empty;
					string condition = string.Empty;
		            if(newValues.DepartmentIDIsValid)
			        {
			            updateString += ",Department_ID=@Department_ID_V";
			            cmd.Parameters.Add(new SqlParameter("@Department_ID_V",newValues.DepartmentID));
                    }
		            if(newValues.DepartmentNameIsValid)