DAL/BookTypeDAL.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Model;
using System.Data.SqlClient;
using System.Data;

namespace DAL
{
    public class BookTypeDAL
    {
        #region //查找该图书类别是否存在
        public BookType bookTypeCheck(BookType bookType)
        {
            string strSql = "select * from bookType where bookTypeId='" + bookType.BookTypeId + "' and bookTypeName = '" + bookType.BookTypeName + "'";
            SqlConnection conn = DBHelper.CreatConn();
            DataTable dt = DBHelper.GetTable(strSql);
            BookType model = new BookType();
            if (dt.Rows.Count > 0)
            {
               return model;
            }
            return null;
        }
        #endregion
        #region //添加图书类别
        public bool AddBookType(BookType bookType)
        {
            string strSql = "insert into BookType values('" + bookType.BookTypeId + "','" + bookType.BookTypeName + "')";
            try
            {
                if (DBHelper.changeData(strSql) > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion
        #region//获取所有类别信息
        public DataTable getType()
        {
            string strSql = "select * from bookType";
            try
            {
                SqlConnection conn = DBHelper.CreatConn();
                if (DBHelper.GetTable(strSql) != null)
                {
                    return DBHelper.GetTable(strSql);
                }
                else
                    return null;