希望好心人能帮我加注释上去
publicSqlDataAdapter myadapter;
SqlCommandBuilder scb;
DataSet myDataSet;
SqlConnection mysqlconnection;
SqlCommand mysqlcommand;
int i;
public void Load()
{
SqlCommand mysqlcommand = mysqlconnection.CreateCommand();
mysqlcommand.CommandText = "select 成绩表.学号,学生表.姓名,成绩表.教师编号,教师表.姓名,成绩表.课程号,课程表.课程名,成绩表.成绩,成绩表.日期 from 教师表,课程表,成绩表,学生表 where 教师表.教师编号=成绩表.任课教师编号 and 成绩表.学号=学生表.学号 and 成绩表.课程号=课程表.课程号 order by 成绩表.日期 desc";
myadapter = new SqlDataAdapter();
myadapter.SelectCommand = mysqlcommand;
myDataSet = new DataSet();
mysqlconnection.Open();
int numberOfRow = myadapter.Fill(myDataSet, "教师表");
this.GridView1.DataSource = new DataView(myDataSet.Tables["教师表"]);
this.GridView1.DataBind();
Label2.Text = "共有" + numberOfRow + "条记录";
mysqlconnection.Close();
}
protected void Page_Load(object sender, EventArgs e)
{
String sqlconn = "data source=.;database=学生成绩管理系统;user id=sosa;password=1234;";
mysqlconnection = new SqlConnection(sqlconn);
mysqlcommand = mysqlconnection.CreateCommand();
mysqlcommand.CommandText = "select 学号 from 学生表";
mysqlconnection.Open();
SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
if (!IsPostBack)
{
while (myDataReader.Read())
{
this.DropDownList1.Items.Add(myDataReader.GetValue(0).ToString());
this.DropDownList2.Items.Add(myDataReader.GetValue(0).ToString());
}
myDataReader.Close();
}
mysqlconnection.Close();
mysqlconnection.Open();
if (!IsPostBack)
{
mysqlcommand = mysqlconnection.CreateCommand();
mysqlcommand.CommandText = "select distinct 课程号 from 课程表";
myDataReader = mysqlcommand.ExecuteReader();
while (myDataReader.Read())
{
this.DropDownList3.Items.Add(myDataReader.GetValue(0).ToString());
}
myDataReader.Close();
}
mysqlconnection.Close();
mysqlconnection.Open();
if (!IsPostBack)
{
mysqlcommand.CommandText = "select 教师编号 from 教师表";
myDataReader = mysqlcommand.ExecuteReader();
while (myDataReader.Read())
{
this.DropDownList4.Items.Add(myDataReader.GetValue(0).ToString());
}
myDataReader.Close();
}
mysqlconnection.Close();
if (!IsPostBack)
{
for (i = 1999; i <= 2020; i++)
this.DropDownList5.Items.Add(Convert.ToString(i));
for (i = 1; i <= 12; i++)
this.DropDownList6.Items.Add(Convert.ToString(i));
for (i = 1; i <= 31; i++)
this.DropDownList7.Items.Add(Convert.ToString(i));
}
if (!IsPostBack){
mysqlcommand.CommandText = "select 课程名 from 课程表 where 课程号='001'";
mysqlconnection.Open();
myDataReader = mysqlcommand.ExecuteReader();
if (myDataReader.Read())
{
TextBox1.Text = myDataReader.GetValue(0).ToString();
}
myDataReader.Close();
mysqlconnection.Close();
}
mysqlcommand.CommandText = "select 姓名 from 教师表 where 教师编号='001'";
mysqlconnection.Open();
myDataReader = mysqlcommand.ExecuteReader();
if (myDataReader.Read())
{
TextBox2.Text = myDataReader.GetValue(0).ToString();
}
myDataReader.Close();
mysqlconnection.Close();
Load();
}
protected void Button1_Click(object sender, EventArgs e)
{
string cTime;
int i = 0, j = 0;
string[] command = new string[100];
SqlCommand mysqlcommand2 = mysqlconnection.CreateCommand();
cTime = DropDownList5.Text + "-" + DropDownList6.Text + "-" + DropDownList7.Text;
mysqlcommand.CommandText = "select 学号 from 学生表 where 学号> ='" + DropDownList1.Text + "' and 学号<='" + DropDownList2.Text + "'";
mysqlconnection.Open();
SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
while (myDataReader.Read())
{
command[i] = myDataReader.GetValue(0).ToString();
i++;
}
myDataReader.Close();
int returnVale = 0;
for (j = 0; j < i; j++)
{
mysqlcommand2.CommandText = "select 课程号 as 数目 from 成绩表 where 课程号='" + DropDownList3.Text + "' and 学号='" + command[j] + "' and 日期='" + cTime + "' and 任课教师编号='" + DropDownList4.Text + "'";
myDataReader = mysqlcommand2.ExecuteReader();
if (myDataReader.Read() == true)
{
myDataReader.Close();
returnVale += 1;
}
else
{
myDataReader.Close();
mysqlcommand2.CommandText = "insert 成绩表(课程号,学号,日期,任课教师编号) values('" + DropDownList3.Text + "','" + command[j] + "','" + cTime + "','" + DropDownList4.Text + "')";
mysqlcommand2.ExecuteNonQuery();
}
}
string str = "'有" + returnVale + "条记录重复!'";
Label1.Text = str;
mysqlconnection.Close();
Load();
}
protected void Button2_Click(object sender, EventArgs e)
{
string cTime;
int i = 0, j = 0;
string[] command = new string[100];
SqlCommand mysqlcommand2 = mysqlconnection.CreateCommand();
cTime = DropDownList5.Text + "-" + DropDownList6.Text + "-" + DropDownList7.Text;
mysqlcommand.CommandText = "select 学号 from 学生表 where 学号> ='" + DropDownList1.Text + "' and 学号<='" + DropDownList2.Text + "'";
mysqlconnection.Open();
SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
while (myDataReader.Read())
{
command[i] = myDataReader.GetValue(0).ToString();
i++;
}
myDataReader.Close();
int returnVale = 0;
for (j = 0; j < i; j++)
{
mysqlcommand2.CommandText = "select 课程号 as 数目 from 成绩表 where 课程号='" + DropDownList3.Text + "' and 学号='" + command[j] + "' and 日期='" + cTime + "' and 任课教师编号='" + DropDownList4.Text + "'";
myDataReader = mysqlcommand2.ExecuteReader();
if (myDataReader.Read() == false)
{
myDataReader.Close();
}
else
{
myDataReader.Close();
mysqlcommand2.CommandText = "delete 成绩表 where 课程号='" + DropDownList3.Text + "'and 学号='" + command[j] + "'and 日期='" + cTime + "'and 任课教师编号='" + DropDownList4.Text + "'";
mysqlcommand2.ExecuteNonQuery();
returnVale += 1;
}
}
string str = "'成功删除" + returnVale + "条记录!'";
Label1.Text = str;
mysqlconnection.Close();
Load();
}
protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)
{
mysqlcommand.CommandText = "select 课程名 from 课程表 where 课程号='" + DropDownList3.SelectedValue + "'";
mysqlconnection.Open();
SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
if (myDataReader.Read())
{
TextBox1.Text = myDataReader.GetValue(0).ToString();
}
myDataReader.Close();
mysqlconnection.Close();
}
protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e)
{
mysqlcommand.CommandText = "select 姓名 from 教师表 where 教师编号='" + DropDownList4.SelectedValue + "'";
mysqlconnection.Open();
SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
if (myDataReader.Read())
{
TextBox2.Text = myDataReader.GetValue(0).ToString();
}
myDataReader.Close();
mysqlconnection.Close();
} --------------------编程问答-------------------- 方法1 鼠标放到不理解的地方（比如单词上）如果是.netformwork的内置方法 可以显示出说明 ，或F12查看
方法2 google,http://msdn.microsoft.com/library/default.aspx 等
--------------------编程问答--------------------
应该是，详情请到MSDN查阅 ado.net --------------------编程问答--------------------
小2黑 有看见你了 --------------------编程问答--------------------
技术区 ，低调，低调。 --------------------编程问答--------------------
--------------------编程问答-------------------- 好心人应该做一些有意义的事情，而不是去帮助一个上课不好好听的白痴。自己挥霍时间是一种罪过，浪费别人的时间罪大恶极，浪费好心人的时间更是没有天理。 --------------------编程问答-------------------- 我觉得注释这些事情，为何自己不好好仔细的看看代码呢，认真看每一行代码，增加理解，多好啊。
public void Load(){//GridView1绑定数据源并给Label2赋值}
protected void Page_Load(object sender, EventArgs e)
{//给几个dropdownlist 赋值 同时调用 Load()}
protected void Button2_Click(object sender, EventArgs e)
{
//Button2点击之后查询并批量删除，记录操作成功的记录数
}
protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)
{
//DropDownList3索引改变后将查询的结果显示在TextBox1.Text 上
}
protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e)
{
//同上
}
补充：.NET技术 , ASP.NET
