Can anyone tell me how to get the value from SELECT query from a table
protected void Button_Click(object sender, EventArgs e)
{
string select_qry = "SELECT ID, USER, FILE, DATE, LASTUSED from FILE_INFO where USER = '" + user + "'"; // ID is primary key
SqlCommand cmd = new SqlCommand(select_qry);
GridView1.DataSource = GetData(cmd);
GridView1.DataBind();
}
private DataTable GetData(SqlCommand cmd)
{
DataTable dt = new DataTable();
SqlDataAdapter sda = new SqlDataAdapter();
cmd.CommandType = CommandType.Text;
cmd.Connection = conn1;
conn1.Open();
sda.SelectCommand = cmd;
sda.Fill(dt);
return dt;
}
I have different USERS I want to get ID of user if user is different say 'Sheena' has ID value from 1-10 but if user is 'Sara' and she is having ID from 11-20 so I want to get specially ID of particular user how do I get ID from select query can any one know then please help me out :)
if the ID will always be first in the select statement you can call this:
VB.NET
var dt = GetData(cmd);
dt.Rows.Item(0).Item("ID")
C#.NET
var dt = GetData(cmd);
dt.Rows[0]["ID"];
I am not getting you quite well. but
Sample data
DataTable dt = new DataTable();
dt.Columns.Add("id", typeof(int));
dt.Columns.Add("userName", typeof(string));
dt.Rows.Add(1, "Sheena");
dt.Rows.Add(2, "Meena");
dt.Rows.Add(2, "Teena");
To get id of first row.
if (dt.Rows.Count > 0)
{
// return id in first row.
int id = (int)dt.Rows[0]["id"];
}
DataTable Select method
if (dt.Rows.Count > 0)
{
DataRow[] dr = dt.Select("userName = 'Meena'");
if (dr.Length > 0)
{
int id2 = (int)dr[0]["id"];
}
}
There are other methods too but these are quickly I can write.
I think you could do that in your query like
Select case id >= 11 and id <= 20 then 'specially id' end as ID ......
Because 'user' is a parameter so you can know the id range when you creating the query.
So that , there is no need any logic in your source code , just fetch data as #Mark said..
Related
protected void Button1_Click(object sender, EventArgs e)
{
string db = "Data Source=DESKTOP-R6H3RTP;Initial Catalog=AdmitDB; Integrated Security= true;";
SqlConnection mycon = new SqlConnection(db);
mycon.Open();
String query = "select * from tblPatient where PhoneNo like '"+TextBox1.Text+"%'";
SqlCommand cmd = new SqlCommand(query, mycon);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
if (cmd.ExecuteNonQuery() > 0)
{
lblName.Visible = true;
lblId.Visible = true;
lblPNo.Visible = true;
lblDOB.Visible = true;
lblName.Text = "PName";
lblId.Text = "Pid";
lblPNo.Text = "PhoneNo";
lblDOB.Text = "PDOB";
}
else
{
lblNotFound.Visible = true;
}
}
i'm searching from database but just else statement executes don't know why it's not get data from database, if any kind of error then help me please
i think you don't need if (cmd.ExecuteNonQuery() > 0). the cmd executes automatically. you want to check the tables in the dataset.
// check the first table for rows.
if(ds.Tables[0].HasRows())
{
// success. now you can work with the table.
}
ExecuteNonQuery method returns the number of row that were modified by the query. Since SELECT query doesn't modify anything in the database - you get 0.
You should modify your query with a COUNT(*) function:
String query = "select COUNT(*) from tblPatient where PhoneNo like '"+TextBox1.Text+"%'";
Then you can get that value with ExecuteScalar():
if (cmd.ExecuteScalar() > 0)
Here's my code:
protected void Page_Load(object sender, EventArgs e)
{
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
connection db_obj1 = new connection();
SqlConnection sql_obj = db_obj1.Connect();
if (this.DropDownList1.SelectedIndex >= 0)
{
string brand = DropDownList1.Items[DropDownList1.SelectedIndex].ToString();
string query = "Select Product,Model, NetPrice, Cost, Profit from products where Brand='" + brand + "'";
// SqlDataReader query_read = query.ExecuteReader();
SqlDataAdapter adapter = new SqlDataAdapter();
SqlCommand command = new SqlCommand(query, sql_obj);
// cmd.Parameters.AddWithValue("#tab",);
DataTable table = new DataTable();
adapter.SelectCommand = command;
adapter.Fill(table);
// Response.Write(dt.Rows.Count.ToString());
GridView grd = new GridView();
grd.FindControl("GridView1");
grd.DataSource = table;
grd.DataBind();
}
}
The problem is that when I run the code, I only see the drop down list and no GridView even when I select dofferent options. I tried debugging and it seems that the table DOES get filled and the only problem that I think is in the line 'grd.FindControl("GridView1").Is this the proper way to give a gridview a data source?
According to me you should not use like
string brand = DropDownList1.Items[DropDownList1.SelectedIndex].ToString();
on behalf that try as below
string brand = DropDownList1.SelectedItem.Text;
after that fire a query.
i hope it will halpful.
After Edit now use this code
string query = "Select Product,Model, NetPrice, Cost, Profit from products where Brand='" + brand + "'";
SqlDataAdapter adapter = new SqlDataAdapter();
SqlCommand command = new SqlCommand(query, sql_obj);
// cmd.Parameters.AddWithValue("#tab",);
DataSet ds = new DataSet();
DataTable table;
adapter.SelectCommand = command;
adapter.Fill(ds, "ABC");
table = ds.Tables["ABC"];
// Response.Write(dt.Rows.Count.ToString());
GridView grd = new GridView();
grd.FindControl("GridView1");
grd.DataSource = table;
grd.DataBind();
Explanation
adapter.Fill(ds, "ABC");
here ABC is a temp name of table you can take anything.
table = ds.Tables["ABC"];
and write here same table name as you have taken a temp table name.
now try it.
i test my query in sql server and it's working 100%
but in my page not work !!
this my query
UPDATE Employee SET
Name='jojo',
Age=19,
GenderID=2,
CountryID=5,
Mobile=0917021092
WHERE EmployeeID=10
this my code
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string s = GridView1.DataKeys[e.RowIndex].Value.ToString();
Label id = (Label)GridView1.Rows[e.RowIndex].FindControl("lblEditID");
Label EmployeeID = (Label)GridView1.Rows[e.RowIndex].FindControl("lblEmployeeID");
TextBox name = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtEditName");
TextBox age = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtEditAge");
DropDownList gender = (DropDownList)GridView1.Rows[e.RowIndex].FindControl("DropGender");
DropDownList country = (DropDownList)GridView1.Rows[e.RowIndex].FindControl("DropCountry");
TextBox mobile = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtEditMobile");
string stringconnectiong = ConfigurationManager.ConnectionStrings["Employee_TestConnectionString"].ConnectionString;
string sql = "update Employee set Name=#Name, Age=#Age,GenderID=#GenderID , CountryID=#CountryID , Mobile=#Mobile where EmployeeID=#EmployeeID AND ID=#ID";
SqlConnection con = new SqlConnection(stringconnectiong);
try
{
con.Open();
SqlCommand cmd = new SqlCommand();
cmd.Parameters.AddWithValue("#EmployeeID", EmployeeID.Text);
cmd.Parameters.AddWithValue("#ID", id.Text);
cmd.Parameters.AddWithValue("#Name", name.Text);
cmd.Parameters.AddWithValue("#Age", age.Text);
cmd.Parameters.AddWithValue("#GenderID", gender.SelectedValue);
cmd.Parameters.AddWithValue("#CountryID", country.SelectedValue);
cmd.Parameters.AddWithValue("#Mobile", mobile.Text);
cmd.CommandType = CommandType.Text;
cmd.CommandText = sql;
cmd.Connection = con;
cmd.ExecuteNonQuery();
SqlDataAdapter dr = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
dr.Fill(ds);
GridView1.DataSource = ds;
GridView1.EditIndex = -1;
BindGridview();
}
catch (System.Data.SqlClient.SqlException ex)
{
string msg = "Error Updating ";
msg += ex.Message;
throw new Exception(msg);
}
finally
{
con.Close();
con.Dispose();
BindGridview();
}
}
Since your datasource is a dataset, you need to specify which data table within the dataset you are using via the DataMember propery. Or just use a data table as your datasource.
Replace the dataset lines with the following:
DataTable dt = new DataTable();
dr.Fill(dt);
GridView1.DataSource = dt;
In addition, use the GridView1_RowUpdated event. The GridView1_RowUpdating event is fired before the table is updated, therefore your parameter values have not been updated yet.
In my asp project I need to write all Items form the list box into database table using TVP. I have listbox, stored procedure (passing TVP - Table Valued Parameters). The main problem is that passing DataTable is NULL, but the Session isn't. I'll send you my code form aspx.cs file (only one block, if you'll nedd more, let me know).
protected void ASPxButton1_Click(object sender, EventArgs e)
{
//DataTable dts = Session["SelectedOptions"] as DataTable;
DataTable _dt;
//_dt = new DataTable("Items");
_dt = Session["SelectedOptions"] as DataTable;
_dt.Columns.Add("Id", typeof(int));
_dt.Columns.Add("Name", typeof(string));
foreach (ListEditItem item in lbSelectedOptions.Items)
{
DataRow dr = _dt.NewRow();
dr["Id"] = item.Value;
dr["Name"] = item.Text;
}
SqlConnection con;
string conStr = ConfigurationManager.ConnectionStrings["TestConnectionString2"].ConnectionString;
con = new SqlConnection(conStr);
con.Open();
using (con)
{
SqlCommand sqlCmd = new SqlCommand("TestTVP", con);
sqlCmd.CommandType = CommandType.StoredProcedure;
SqlParameter tvpParam = sqlCmd.Parameters.AddWithValue("#testtvp", _dt);
tvpParam.SqlDbType = SqlDbType.Structured;
sqlCmd.ExecuteNonQuery();
}
con.Close();
}
EDIT
Debugging Screenshot
You are not adding the new rows to the DataTable. You need something like this:
foreach (ListEditItem item in lbSelectedOptions.Items)
{
DataRow dr = _dt.NewRow();
dr["Id"] = item.Value;
dr["Name"] = item.Text;
_dt.Rows.Add(dr);
}
A secondary concern is where are you initialising Session["SelectedOptions"]? It appears that every time ASPxButton1 is clicked the code will try and add Id and Name columns to it, even if it already contains those two columns. It would seem more logical to do something like:
_dt = Session["SelectedOptions"] as DataTable;
if (_dt == null)
{
_dt = new DataTable("Items");
_dt.Columns.Add("Id", typeof(int));
_dt.Columns.Add("Name", typeof(string));
Session.Add("SelectedOptions", _dt);
}
I have a DatagridView and i want to populate it with the contents of a database. I know it can be done through DataAdapter, dataset and Fill/Update commands and all. But what I want to know is, how to write it in a 3tier architecture. I mean, what will be the commands in the Presentation layer, Business layer and Data layer. I am new born baby for 3tier architecturre. And not able to get it right.Thanks.
After googling it for a while and implementing some of my techniques, I came upto this:
UILayer:
private void FillData(object sender, EventArgs e)
{
BusinessObject bo = new BusinessObject();
Datatable dt = new Datatable();
dt = bo.getTable();
datagridview.DataSource = dt;
}
BusinessLayer:
public DataTable getTable()
{
DataLayer dl = new DataLayer();
DataTable dt = new DataTable();
dt = dl.getTable();
if(dt == null || dt.HasErrors == true)
{
MessageBox.Show("Datable has Errors or is Null");
return
}
return dt;
}
DataLayer:
public DataTable getTable()
{
SqlConnection con = new SqlConnection(connectionString);
string myCommand = "Select empId, empDesignation from Employees";
con.Open();
SqlDataAdapter sda = new SqlDataAdapter(myCommand, con);
DataTable dt = new DataTable();
sda.Fill(dt);
return dt;
}
Hope it helps.