在线考试系统紧急问题!
protected void Button1_Click(object sender, EventArgs e){
OleDbConnection myconn = DB.CreateDB();
myconn.Open();
OleDbCommand mycomm = new OleDbCommand("select * from jieguo where [user_name] = '" + Session["name"].ToString() + "'", myconn); //验证是否已经考试过
int number = Convert.ToInt32(mycomm.ExecuteScalar());
if (number > 0)
{ //若考试过就用这次的答案更新以前的答案
try
{
OleDbConnection myconnection = DB.CreateDB();
myconnection.Open();
for (int i = 0; i < this.DataList1.Items.Count; i++)
{
Label l = (Label)this.DataList1.Items[i].FindControl("Lb");
TextBox tx = (TextBox)this.DataList1.Items[i].FindControl("Txt");
OleDbCommand mycommand = new OleDbCommand("update jieguo set zy_ID = " + Convert.ToInt32(l.Text) + ",[user_name] = '" + Session["name"].ToString() + "',body = '" + tx.Text + "',[time] = '" + DateTime.Now + "'", myconnection);
int num = mycommand.ExecuteNonQuery();
}
Response.Write("<script language=javascript>window.alert('恭喜你交卷成功！');window.location('login.aspx')</script>");
myconnection.Close();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}
else
{ //若没考试过就往数据库里插入答案
try
{
OleDbConnection myconnection = DB.CreateDB();
myconnection.Open();
for (int i = 0; i < this.DataList1.Items.Count; i++)
{
Label la = (Label)this.DataList1.Items[i].FindControl("Lb");
TextBox tx = (TextBox)this.DataList1.Items[i].FindControl("Txt");
OleDbCommand mycommand = new OleDbCommand("insert into jieguo (zy_ID,[user_name],body,[time]) values (" + Convert.ToInt32(la.Text) + ",'" + Session["name"].ToString() + "','" + tx.Text + "','" + DateTime.Now + "')", myconnection);
int num = mycommand.ExecuteNonQuery();
}
Response.Write("<script language=javascript>window.alert('恭喜你交卷成功！');window.location('login.aspx')</script>");
myconnection.Close();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}
}
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//错误信息：（在数据库中查不到数据时）
语法错误 (操作符丢失) 在查询表达式 ''protected void Button1_Click(object sender, EventArgs e) { OleDbConnection myconn = DB.CreateDB(); myconn.Open(); OleDbCommand mycomm = new OleDbCommand("select * from jieguo where [user_name] = '" + Session["name"].ToStri' 中。
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//错误信息：（在数据库中查到数据时）
不提示错误，但是数据库中有多少条数据就被更新多少条，并且更新的结果都是最后一题的答案
