DAL/TeachersDAO.cs

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

namespace DAL
{
    public class TeachersDAO
    {
        private SQLHelper sqlhelper;
        public TeachersDAO()
        {
            sqlhelper = new SQLHelper();
        }
        #region 选择全部教师信息
        /// <summary>
        /// 选择全部教师信息
        /// </summary>
        /// <returns></returns>
        public DataTable SelectAll()
        {
            return sqlhelper.ExecuteQuery("SELECT teacherId,pwd, name, post, college, phone, email FROM teachers", CommandType.Text);
        }
        #endregion
        #region 按条件选择教师信息
        /// <summary>
        /// 按条件选择教师信息
        /// </summary>
        /// <returns></returns>
        public DataTable SelectByValue( string n)
        {
            SqlParameter[] paras = new SqlParameter[]
            {
                 new SqlParameter ("@value",n ),
            };
            return sqlhelper.ExecuteQuery("SELECT teacherId,pwd, name, post, college, phone, email FROM teachers WHERE teacherId=@value or name like '%'+@value+'%'or college like '%'+@value+'%' or post like '%'+@value+'%'  ", paras, CommandType.Text);
        }
        #endregion
        #region 更新教师信息
        /// <summary>
        /// 更新教师信息
        /// </summary>
        /// <param name="n">教师信息实体类</param>
        public void Update(teachers n)
        {
            SqlParameter[] paras = new SqlParameter[]
            {
                new SqlParameter ("@name",n.Name),
                new SqlParameter ("@post",n.Post),  
                new SqlParameter ("@college",n.College), 
                new SqlParameter ("@phone",n.Phone ),
                new SqlParameter ("@email",n.Email),
                new SqlParameter ("@modifier",n.Modifier),
                new SqlParameter ("@teacherId",n.TeacherId),
            };
            sqlhelper.ExecuteQuery("UPDATE teachers SET name = @name,post = @post,college=@college,phone = @phone,email = @email,modifier = @modifier,lastmodify = getdate() where teacherId=@teacherId", paras, CommandType.Text);
        }