DAL/GroupInfoDAL.cs

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using System;
using System.Data;
using System.Text;
using System.Data.SqlClient;
using Maticsoft.DBUtility;//Please add references
namespace DAL
{
	/// <summary>
	/// 数据访问类:GroupInfoDAL
	/// </summary>
	public partial class GroupInfoDAL
	{
		public GroupInfoDAL()
		{}
		#region  Method

		/// <summary>
		/// 得到最大ID
		/// </summary>
		public int GetMaxId()
		{
		return DbHelperSQL.GetMaxID("GroupId", "GroupInfo"); 
		}

		/// <summary>
		/// 是否存在该记录
		/// </summary>
		public bool Exists(int GroupId)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("select count(1) from GroupInfo");
			strSql.Append(" where GroupId=@GroupId ");
			SqlParameter[] parameters = {
					new SqlParameter("@GroupId", SqlDbType.Int,4)};
			parameters[0].Value = GroupId;

			return DbHelperSQL.Exists(strSql.ToString(),parameters);
		}


		/// <summary>
		/// 增加一条数据
		/// </summary>
		public int Add(Models.GroupInfo model)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("insert into GroupInfo(");
			strSql.Append("GroupName)");
			strSql.Append(" values (");
			strSql.Append("@GroupName)");
			strSql.Append(";select @@IDENTITY");
			SqlParameter[] parameters = {
					new SqlParameter("@GroupName", SqlDbType.NVarChar,300)};
			parameters[0].Value = model.GroupName;

			object obj = DbHelperSQL.GetSingle(strSql.ToString(),parameters);
			if (obj == null)
			{
				return 0;
			}