admin/coursetask.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.IO;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.HSSF.UserModel;
using NPOI;
using NPOI.HSSF;
using NPOI.HPSF;
using NPOI.SS;
using NPOI.Util;
using NPOI.SS.Util;
namespace 排课系统.admin
{
    public partial class coursetask : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                if (Session["username"] == null)
                {
                    WebMessageBox.Show("请登录", "../Default.aspx");
                }else

                Label1.Text = Session["username"].ToString();

                DataTable dt1 = Operation.getDatatable("select DISTINCT major from t_coursetask");
                DropDownList1.DataSource = dt1;//设置数据源
                DropDownList1.DataTextField = "major";//设置所要读取的数据表里的列名
                DropDownList1.DataBind();//数据绑定

                DataTable dt2 = Operation.getDatatable("select DISTINCT grade from t_coursetask");
                DropDownList2.DataSource = dt2;//设置数据源
                DropDownList2.DataTextField = "grade";//设置所要读取的数据表里的列名
                DropDownList2.DataBind();//数据绑定
                //绑定
                bind();
            }
        }
        public void bind()
        {
            string sqlstr = "select t_coursetask.*,t1.name as teachnamez,t2.name as teachnamef,t3.name as teachnames from ((t_coursetask left join t_teacher t1 on teachidz=t1.teachid) left join t_teacher t2 on teachidf=t2.teachid) left join t_teacher t3 on teachids=t3.teachid"+
                " where (t_coursetask.coursename like '%" + this.findinfo.Text + "%' OR LEN('" + this.findinfo.Text + "')=0) and t_coursetask.major='" +
               DropDownList1.SelectedValue.ToString() + "' and t_coursetask.grade='" + DropDownList2.SelectedValue.ToString() + "'";
            GridView1.DataSource = Operation.getDatatable(sqlstr);
            GridView1.DataKeyNames = new string[] { "id" };//主键
            GridView1.DataBind();
        }


        protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string sqlstr = "delete from t_coursetask where id='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
            Operation.runSql(sqlstr);