I'm importing the table 'tblTable' to Datagridview in C# with:
private void button1_Click(object sender, EventArgs e)
{
con.Open();
//
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT * FROM tblTable";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter sa = new SqlDataAdapter(cmd);
sa.Fill(dt);
dataGridView1.DataSource = dt;
con.Close();
}
I have written a specific SQLQuery, 'SQLQuery1.sql' that does some groupings from the table 'tblTable' that I'm already importing. What would be the best way to import only the SQLQuyery1.sql in to C#, without importing all the table?
Many thanks
It would probably be best to make your query into a Stored Procedure, and call instead:
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "MyStoredProc";
Related
This Messages form display table with these informations (ID,FROM,TO,TITLE,MESSAGE).
I am trying to search for all the messages send to a certain user . user will enter his name in the Search_textBox then it will filter the table to keep only messages to this user.
private void Search_button_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = cmd.CommandText = "Select * from MessagesTable where To =" + Search_textBox.Text;
cmd.Parameters.AddWithValue("#To", Search_textBox.Text);
DataSet dataSet = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
adapter.Fill(dataSet);
dataGridView1.DataSource = dataSet.Tables[0];
}
I get this error :
System.Data.SqlClient.SqlException: 'Invalid column name 'To'.'
What does the "search_name" parameter contains? The Message? The Column Name?
Your query is
Select * from MessagesTable where " + search_name + " = #From"
Then you specifies the "search_name" as a parameter for the #From...
So I believe your input was "Name" and your query is looked like this now:
Select * from MessagesTable where Name = 'Name';
You do not have any Name column in this specified table as you described.
this is Correct
private void Search_button_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "Select * from MessagesTable where [To]= #To";
cmd.Parameters.AddWithValue("#To", Search_textBox.Text);
DataSet dataSet = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
adapter.Fill(dataSet);
dataGridView1.DataSource = dataSet.Tables[0];
}
You can change it as follows. Of course, if I understand correctly, that you want to search in the messages field by the input you get from the user.
private void Search_button_Click(object sender, EventArgs e)
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "Select * from MessagesTable where MESSAGE = #From";
cmd.Parameters.AddWithValue("#From", search_name);
DataSet dataSet = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
adapter.Fill(dataSet);
dataGridView1.DataSource = dataSet.Tables[0];
}
Try with To, because "To" - keyword SQL:
cmd.CommandText = cmd.CommandText = "Select * from MessagesTable where [To] =" + Search_textBox.Text;
Please help when i insert a new data to the database it is not showing in the comboBox unless i restart the program. Is something missing from this ?
CmbSupp.Items.Clear();
con.Open();
Refresh();
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select SupplierName from SuppTbl";
cmd.ExecuteNonQuery();
DataTable dt = new DataTable();
SqlDataAdapter dp = new SqlDataAdapter(cmd);
dp.Fill(dt);
foreach (DataRow dr in dt.Rows)
{
CmbSupp.Items.Add(dr["SupplierName"].ToString());
}
con.Close();
Thankyou in advance!
Change
CmbSupp.Items.Clear()
To CmbSupp.Items = null;
this is a small Bug,You have to set Null Value and Reset Data;
Try It;
You could do this:
DataTable dt = new DataTable();
private void RefreshData()
{
dt.Clear();
con.Open();
Refresh();
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select SupplierName from SuppTbl";
cmd.ExecuteNonQuery();
SqlDataAdapter dp = new SqlDataAdapter(cmd);
dp.Fill(dt);
con.Close();
cmd.Dispose();
}
private void BindToComboBox()
{
CmbSupp.DataSource = dt;
CmbSupp.ValueMember = "SupplierName";
CmbSupp.DisplayMember = "SupplierName";
}
Ideally, you include the table's ID and put it in ValueMember property. You call the Bind ToComboBox once and just call RefreshData() when there's changes in the database. It should automatically update the contents of the combobox.
So I am using MS visual studio to create an application in c# that will pull information from a sql server database.
I have created a textbox and a button to search my gridview. I am using a stored procedure that searched multiple rows to pull information from my Sql Database.
I am having trouble with my aspx.cs code. I have tried so many different ways to create a searchbox but haven't had any luck yet
Here is my code for my search button.
I am getting the error-
"Input string was not in a correct format."
this error is on the line cmd.ExecuteNonQuery();
Help is much appreciated, thank you.
protected void Button_srch_invest1_Click(object sender, EventArgs e)
{
string connectionStr = ConfigurationManager.ConnectionStrings["ORAProjectConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(connectionStr))
{
string find = "sp_SrcProtocols";
SqlCommand cmd = new SqlCommand(find, con);
cmd.Parameters.Add("#ORAID", SqlDbType.Int).Value = TextBox_Srch.Text;
cmd.Parameters.Add("#InvestLastName", SqlDbType.NVarChar).Value = TextBox_Srch.Text;
cmd.Parameters.Add("#ManagerLastName", SqlDbType.NVarChar).Value = TextBox_Srch.Text;
con.Open();
cmd.ExecuteNonQuery();
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds, "ORAID");
da.Fill(ds, "InvestLastName");
da.Fill(ds, "ManagerLastName");
GridView1.DataSource = ds;
GridView1.DataBind();
con.Close();
}
}
By default, a SqlCommand expects a query, not a stored procedure's name. You have to set the command type before executing it.
cmd.CommandType = CommandType.StoredProcedure;
It seems, you are passing same text box value (TextBox_Srch.Text) to all 3 parameters. And first parameter #ORAID is expecting integer value and you might be passing text. So it's causing SQL server to raise below error.
Input string was not in a correct format.
This is what worked (and i changed my sql to just accept one parameter #search)
protected void Button_srch_invest1_Click(object sender, EventArgs e)
{
string connectionStr = ConfigurationManager.ConnectionStrings["ORAProjectConnectionString"].ConnectionString;
using (SqlConnection con = new SqlConnection(connectionStr))
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = "sp_SrcProtocols";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("#search", SqlDbType.NVarChar).Value = TextBox_Srch.Text;
con.Open();
SqlDataReader rdr = cmd.ExecuteReader();
con.Close();
}
}
I want to display my oracle sql table on datagridview using windows form on visual studio 2017 c#. I am using oracle.data.access.client and type
private void button1_Click(object sender, EventArgs e)
{
string oradb = "Data Source=127.0.0.1;User Id=practice;Password=practice;";
OracleConnection conn = new OracleConnection(oradb);
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = "select * from test_dummy";
cmd.CommandType = CommandType.Text;
OracleDataReader dr = cmd.ExecuteReader();
dr.Read();
dataGridView1.DataSource = dr;
conn.Dispose();
}
I don't get it.. How do i make this work? . >.<
DataSource of DataGridView in this case should be DataTable not DataReader so I think you should change your code like this
OracleDataReader dr = cmd.ExecuteReader();
DataTable dataTable = new DataTable();
dataTable.Load(dr);
dataGridView1.DataSource = dataTable;
If you change like this and debug it has data but still nothing to display, you should check your data column binding
protected void Button1_Click(object sender, EventArgs e)
{
string query = "select * from aspnet_Users where userName like '%#UserName%'";
connection.Open();
SqlCommand command = new SqlCommand(query, connection);
command.Parameters.Add("#UserName", SqlDbType.NVarChar).Value = TextBox1.Text;
SqlDataReader reader = command.ExecuteReader();
GridView1.DataSource = reader;
GridView1.DataBind();
connection.Close();
}
I am trying to use connected model to search a user's data in a table but the GridView is always, never fills with data.
You parameter is acting as a string in your query because of single quotes you have include around the parameter. That is the reason it is not able to identify the parameter. Try this:-
string query = "select * from aspnet_Users where userName LIKE #UserName";
Then add it as parameter like this:-
command.Parameters.Add("#MyName",SqlDBType.NVarChar,40).Value ="%" + TextBox1.Text + "%";
You can populate gridview using SqlDataAdapter, your code look like this
string query = "select * from aspnet_Users where userName like '%#UserName%'";
SqlCommand cmd = new SqlCommand();
cmd.CommandText = query;
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("#UserName", TextBox1.Text);
cmd.Connection = conn;
SqlDataAdapter dap = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
dap.Fill(ds);
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();