I am struggling with SqlDataReader and ChartControl. I have added one line without any problem, but i want to add multiple of them and can't do that at all altought I was searching for that all day long.
What I have is table with some names of columns id, date, value1, value2, value3. I am getting them using SqlDataReader.
SqlConnection con4 = new
SqlConnection(ConfigurationManager.ConnectionStrings["przychodniaConnectionString1"].ConnectionString);
string cmdStr4 = "select badCisData, badCisSkurczowe, badCisRozkurczowe, badCisPuls from badanieCis where pacID='" +
Label3.Text + "' ORDER BY badCisData ASC";
SqlCommand getResults = new SqlCommand(cmdStr4, con4);
con4.Open();
SqlDataReader reader = getResults.ExecuteReader();
Then I am making my chart like that:
Chart2.Series["Series1"].Points.DataBindXY(reader, "badCisData",
reader, "badCisPuls");
Chart2.Series["Series2"].Points.DataBindXY(reader, "badCisData",
reader, "badCisSkurczowe");
And I have error on Series2. I would like to put date on x axis and on y axis (value1, value2 etc.)
using (SqlConnection con4 = new
SqlConnection(ConfigurationManager.ConnectionStrings["przychodniaConnectionString1"].ConnectionString))
{
string cmdStr4 = "select badCisData, badCisSkurczowe, badCisRozkurczowe, badCisPuls from badanieCis where pacID='" +
Label3.Text + "' ORDER BY badCisData ASC";
using (SqlCommand getResults = new SqlCommand(cmdStr4, con4))
{
con4.Open();
using (SqlDataReader reader = getResults.ExecuteReader())
{
if (reader.Read())
{
//Your code like reader["Column Name"]
}
}
}
}
Related
i have to store a select query result in a variable .i'm new in asp.net . i used executescalar but it doesn't work. i try many times but i failed here my last try :
using (SqlConnection sqlConnection = new SqlConnection())
{
var connetionString = ConfigurationManager.ConnectionStrings["connections"].ToString();
sqlConnection.ConnectionString = connetionString;
string sql = "Select sum((prime_comptant+10)*0.12) from mvt_garantie_quittance where numero_quittance='" + numQuittance + "'";
SqlDataAdapter adapter = new SqlDataAdapter(sql, sqlConnection);
DataSet dataset = new DataSet();
adapter.Fill(dataset);
string result = dataset.Tables[0].ToString();
}
Can you fix the code to me? i have to store the result in a variable
string sql = "Select sum((prime_comptant+10)*0.12) from mvt_garantie_quittance where numero_quittance='" + numQuittance + "'";
var connetionString = ConfigurationManager.ConnectionStrings["connections"].ToString();
string result = null;
using (SqlConnection conn = new SqlConnection(connetionString))
{
SqlCommand cmd = new SqlCommand(sql, conn);
conn.Open();
result = cmd.ExecuteScalar().ToString();
}
i want to Select Values ex(Date,Time....)from SQLServer on the PageLoad & shows Them in The Many Labels. i try this code but in all labels shows the Time . i want to show All Values not one value in all labels . Please help me .
string strquery = "select Time,Date,SeatPrice,EventName from Event_SingleReservation";
SqlConnection connection2 = DBConnection.getConnection();
connection2.Open();
SqlCommand cmd2 = new SqlCommand();
cmd2.Connection = connection2;
cmd2.CommandText = strquery;
string eventname = cmd2.ExecuteScalar().ToString();
lbl1_EventName.Text = eventname;
string eventdate = cmd2.ExecuteScalar().ToString();
lbl2_EventDate.Text = eventdate;
string eventtime = cmd2.ExecuteScalar().ToString();
lbl3_EventTime.Text = eventtime;
string seatprice = cmd2.ExecuteScalar().ToString();
lbl_seatpriceshow.Text = seatprice;
The ExecuteScalar() selects only one value from the first column - i.e. using it against select Time,Date,SeatPrice,EventName from Event_SingleReservation will return only Time which is the first column.
To select all values you should use ExecuteReader()
SqlDataReader reader = cmd2.ExecuteReader();
if (reader.Read())
{
lbl1_EventName.Text = reader[0];
lbl3_EventDate.Text = reader[1];
...
}
See What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?
I am trying to insert date into database from Session DateValue by converting it into dateTime. The problem i am facing is its accepting the value of april month but when i am entering the value of March its giving error.
Please Help, The Query and the code i have used is as follow:
string a = Session["Date_Value"].ToString();
DateTime date= DateTime.Parse(a);
foreach (GridViewRow g1 in grdData.Rows)
{
//string Status = (g1.FindControl("TextBox1") as TextBox).Text;
//int Status = Convert.ToInt32(Sta);
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Real_Attendance"].ConnectionString);
SqlCommand cmd = new SqlCommand("Insert into Attendanc(Stu_id,Status,time,Date,Sub_id) values('" + g1.Cells[3].Text + "',#Status,'" + Session["Time_Value"].ToString() + "', #Date ,'" + Session["Sub_id"].ToString() + "')", con);
//SqlCommand cmd = new SqlCommand("Insert into Attendanc(Stu_id,Status,time,Date,Sub_id) values('" + g1.Cells[3].Text + "','"+ g1.Cells[1].Text +"','" + Session["Time_Value"].ToString() + "','" + Session["Date_Value"].ToString() + "','" + Session["Sub_id"].ToString() + "')", con);
//cmd.Parameters["#Status"].Value = ((Label)(g1.FindControl("Label1"))).Text;
cmd.Parameters.AddWithValue("#Status", ((Label)(g1.FindControl("Label1"))).Text);
cmd.Parameters.AddWithValue("#Date", date.ToShortDateString());
// cmd.Parameters.AddWithValue("#Date", date.ToShortDateString());
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
This is the code I am using to create session. I am creating session at webform3 And using its value at webform4
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
Calendar1.Visible = false;
System.DateTime myDate = new System.DateTime();
myDate = Calendar1.SelectedDate;
txtDate.Text = myDate.ToString("dd/MM/yyyy");
Date = txtDate.Text;
day = Calendar1.SelectedDate.DayOfWeek.ToString();
Response.Write(day);
txtday.Text = day;
Session["Date_Value"] = Date;
//SelectTime();
}
I'm not sure this will solve your problem, but it will improve your code:
string a = Session["Date_Value"].ToString();
DateTime date= DateTime.Parse(a);
using(SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Real_Attendance"].ConnectionString))
{
con.Open();
foreach (GridViewRow g1 in grdData.Rows)
{
using(SqlCommand cmd = new SqlCommand("Insert into Attendanc (Stu_id,Status,time,Date,Sub_id) values (#Stu_id, #Status, #Time, Convert(DateTime, #Date, 103), #Sub_id)", con))
{
cmd.Parameters.AddWithValue("#Stu_id", g1.Cells[3].Text);
cmd.Parameters.AddWithValue("#Status", ((Label)(g1.FindControl("Label1"))).Text);
cmd.Parameters.AddWithValue("#Time", Session["Time_Value"].ToString());
cmd.Parameters.AddWithValue("#Date", date.ToString("dd/MM/yyyy"));
cmd.Parameters.AddWithValue("#Sub_id", Session["Sub_id"].ToString());
cmd.ExecuteNonQuery();
}
}
con.Close();
}
First, I've changed sql statement to have only parameters. It's cleaner, safer, and easier to read and debug this way.
Second, I've changed the value that #Date parameter gets to a specific date format, and informed the database the expected format using the Convert function. this should fix your conversion problem.
Other improvements: I've moved the opening and closing of the connection outside of the foreach loop. there is no need to close and reopen the connection for each command execute. Also, I've moved the SqlConnection and the SqlCommand into using statements, as recommended by microsoft.
string date = ddlShowDates.SelectedValue.ToString();
cmd = new SqlCommand("SELECT tbl_Shows.ShowTime FROM tbl_Shows INNER JOIN tbl_MovieTimings ON tbl_Shows.ShowId = tbl_MovieTimings.ShowId WHERE tbl_MovieTimings.Date='" + date + "'", con);
I want to display show time in dropdownlist as per date is selected.
Always use sql-parameters instead of string concatenation to prevent sql-injection.
I guess you have a second DropDownList which should be filled from the first:
DateTime date = DateTime.Parse(ddlShowDates.SelectedValue);
string sql = #"SELECT tbl_Shows.ShowTime
FROM tbl_Shows
INNER JOIN tbl_MovieTimings
ON tbl_Shows.ShowId = tbl_MovieTimings.ShowId
WHERE tbl_MovieTimings.Date=#Date";
using(var con = new SqlConnection("ConnectionString"))
using(var cmd = new SqlCommand(sql, con))
{
cmd.Parameters.Add("#Date", SqlDbType.Date).Value = date;
con.Open();
using(var rd = cmd.ExecuteReader())
{
while(rd.Read())
{
TimeSpan time = rd.GetTimeSpan(0);
timeDropDownList.Items.Add(time.ToString());// change format as desired in TimeSpan.ToString
}
}
}
2 questions for everybody.
1) How can I order the years by their value, it crashes when I use DESC?
2) If I populate my list like so:
string strConn = ConfigurationManager.ConnectionStrings["rde_410978ConnectionString"].ToString();
SqlConnection con = new SqlConnection(strConn);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "Select Distinct Year from MonthlySales DESC"; //DESC DOESNT WORK?
DataSet objDs = new DataSet();
SqlDataAdapter dAdapter = new SqlDataAdapter();
dAdapter.SelectCommand = cmd;
con.Open();
dAdapter.Fill(objDs);
con.Close();
if (objDs.Tables[0].Rows.Count > 0)
{
ddItems.DataSource = objDs.Tables[0];
ddItems.DataTextField = "Year";
ddItems.DataValueField = "Year";
ddItems.DataBind();
ddItems.Items.Insert(0, "Select");
}
How can I make the year selected appear under ddItems.SelectedItem?
WHERE Year = " + ddItems.SelectedItem + "GROUP BY Name ";
That part of another query doesn't work when I populate my list dynamically, any reasons why/ how can I fix it.
Regards.
EDIT:
To make my second question clearer, after debugging its always selecting the top item in the drop down list not the actual selected item?
First, in your sql you are missing "order by"...use this
"Select Distinct Year from MonthlySales order by Year DESC"
Second, you need to make use of the SelectedValue property to get your dropdown's selected value...as below...
WHERE Year = " + ddItems.SelectedValue + " GROUP BY Name";
Having said that, I strongly recommend you to use..."parameterized" sql...Here is an example on how you could enable parameterized sql query...
Give me parameterized SQL, or give me death
Update:
Looks like you are binding your dropdown on every post back...you may try this...
if (!Page.IsPostBack && objDs.Tables[0].Rows.Count > 0)
{
ddItems.DataSource = objDs.Tables[0];
ddItems.DataTextField = "Year";
ddItems.DataValueField = "Year";
ddItems.DataBind();
ddItems.Items.Insert(0, "Select");
}
Ans 1)
cmd.CommandText = "Select Distinct Year from MonthlySales ORDER BY 1 DESC"
You are missing order by. Here it is.
"Select Distinct Year from MonthlySales order by Year DESC";
For your second part you can do this. Please mind the space in " GROUP BY Name"
WHERE Year = " + ddItems.SelectedItem.Text + " GROUP BY Name ";
using (SqlConnection con = new SqlConnection(strConn))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "Select Distinct Year from MonthlySales Order By DESC";
using (DataSet objDs = new DataSet())
{
using (SqlDataAdapter dAdapter = new SqlDataAdapter())
{
dAdapter.SelectCommand = cmd;
con.Open();
dAdapter.Fill(objDs);
con.Close();
if (objDs.Tables[0].Rows.Count > 0)
{
ddItems.DataSource = objDs.Tables[0];
ddItems.DataTextField = "Year";
ddItems.DataValueField = "Year";
ddItems.DataBind();
ddItems.Items.Insert(0, "Select");
}
}
}
}
}