dteacherability.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 DTeacherAbility:IDTeacherAbility
	{
	    #region 插入实体操作部份
	    /// <summary>
        /// 插入
        /// </summary>
		/// <param name="cmd">Command对象</param>
        /// <param name="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
		private int Insert(SqlCommand cmd, TeacherAbility teacherAbility)
		{
		    cmd.Parameters.Clear();
			cmd.CommandText = "insert into TeacherAbility (Teacher_ID,Course_ID) values (@Teacher_ID,@Course_ID)";
			//从实体中取出值放入Command的参数列表
            cmd.Parameters.Add(new SqlParameter("@Teacher_ID",teacherAbility.TeacherID));
            cmd.Parameters.Add(new SqlParameter("@Course_ID",teacherAbility.CourseID));
            return cmd.ExecuteNonQuery();
		}
	    /// <summary>
        /// 不使用事务的插入方法
        /// </summary>
        /// <param name="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
	    public int Insert(TeacherAbility teacherAbility)
		{
		    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, teacherAbility);
                }
			}
			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="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Insert(IConnection connection,TeacherAbility teacherAbility)
        {
			SqlCommand cmd=connection.Command as SqlCommand;
            return Insert(cmd, teacherAbility);
        }
		#endregion
		
		#region 删除实体操作
		
		/// <summary>
        /// 不使用事务的删除方法
        /// </summary>
        /// <param name="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Delete(TeacherAbility teacherAbility)
        {
            int result = 0;
            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="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Delete(IConnection connection,TeacherAbility teacherAbility)
        {
            int result = 0;
            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="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Delete(IConnection connection,TeacherAbilitySearcher searcher)
        {
            int result = 0;
			string condition=string.Empty;
			SqlCommand cmd=connection.Command as SqlCommand;
			cmd.Parameters.Clear();
		    if(searcher.TeacherIDIsValid)
			{
			    condition += " and Teacher_ID=@Teacher_ID";
		        cmd.Parameters.Add(new SqlParameter("@Teacher_ID",searcher.TeacherID));
			}
		    if(searcher.CourseIDIsValid)
			{
			    condition += " and Course_ID=@Course_ID";
		        cmd.Parameters.Add(new SqlParameter("@Course_ID",searcher.CourseID));
			}
			if(condition!=string.Empty)
			{
				condition=" where "+condition.Substring(4);
			}
			cmd.CommandText="delete from  TeacherAbility "+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(TeacherAbilitySearcher 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.TeacherIDIsValid)
			        {
			            condition += " and Teacher_ID=@Teacher_ID";
		                cmd.Parameters.Add(new SqlParameter("@Teacher_ID",searcher.TeacherID));
			        }
		            if(searcher.CourseIDIsValid)
			        {
			            condition += " and Course_ID=@Course_ID";
		                cmd.Parameters.Add(new SqlParameter("@Course_ID",searcher.CourseID));
			        }
			        if(condition!=string.Empty)
			        {
				        condition=" where "+condition.Substring(4);
			        }
                    cmd.CommandText="delete from  TeacherAbility "+condition;
                    result =  cmd.ExecuteNonQuery();
                }
            }
            return result;
        }
		#endregion
		
		#region 更新实体操作
		
		/// <summary>
        /// 不使用事务的更新方法
        /// </summary>
        /// <param name="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
	    public int Update(TeacherAbility teacherAbility)
		{
		    int result=0;
			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="teacherAbility">实体类对象</param>
        /// <returns>影响的记录行数</returns>
        public int Update(IConnection connection,TeacherAbility teacherAbility)
        {
            int result = 0;
            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(TeacherAbilitySearcher searcher,TeacherAbilitySearcher 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.TeacherIDIsValid)
			        {
			            updateString += ",Teacher_ID=@Teacher_ID_V";
			            cmd.Parameters.Add(new SqlParameter("@Teacher_ID_V",newValues.TeacherID));
                    }
		            if(newValues.CourseIDIsValid)
			        {
			            updateString += ",Course_ID=@Course_ID_V";
			            cmd.Parameters.Add(new SqlParameter("@Course_ID_V",newValues.CourseID));
                    }
		            if(searcher.TeacherIDIsValid)
			        {
			            condition += " and Teacher_ID=@Teacher_ID_C";
			            cmd.Parameters.Add(new SqlParameter("@Teacher_ID_C",searcher.TeacherID));
					}
		            if(searcher.CourseIDIsValid)
			        {
			            condition += " and Course_ID=@Course_ID_C";
			            cmd.Parameters.Add(new SqlParameter("@Course_ID_C",searcher.CourseID));
					}
					if(condition != string.Empty)
					{
						condition=" where"+condition.Substring(4);
					}
				    cmd.CommandText="update TeacherAbility set "+updateString.Substring(1)+condition;
                    result=cmd.ExecuteNonQuery();
                }
			}
			return result;
		}
		/// <summary>
        /// 根据查询对象构建过滤条件并使用事务的更新方法
        /// </summary>
		/// <param name="connection">实现共享Command的对象</param>
        /// <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>