I'm trying to insert some records to 2 tables at same event
private void Btngravar_Click(object sender, EventArgs e)
{
MySqlConnection conn = new MySqlConnection("server=localhost;user id=root;database=saude;Password=");
conn.Open();
MySqlCommand objcmd = new MySqlCommand("insert into dispensacao (DESTINATARIO,COD_UNIDADE,COD_DEPARTAMENTO,DATA,SOLICITANTE,DEFERIDO_POR) values(?,?,?,?,?,?)", conn);
objcmd.Parameters.Add("#DESTINATARIO", MySqlDbType.VarChar, 45).Value = Cmbdestinatario.Text;
objcmd.Parameters.AddWithValue("#COD_UNIDADE", string.IsNullOrEmpty(Txtcodigounidade.Text) ? (object)DBNull.Value : Txtcodigounidade.Text);
objcmd.Parameters.AddWithValue("#COD_DEPARTAMENTO", string.IsNullOrEmpty(Txtcodigodep.Text) ? (object)DBNull.Value : Txtcodigodep.Text);
DateTime fdate = DateTime.Parse(Txtdata.Text);
objcmd.Parameters.Add("#DATA", MySqlDbType.DateTime).Value = fdate;
objcmd.Parameters.Add("#SOLICITANTE", MySqlDbType.VarChar, 45).Value = Txtsolicitante.Text;
objcmd.Parameters.Add("#DEFERIDO_POR", MySqlDbType.VarChar, 45).Value = Txtdeferido.Text;
objcmd.ExecuteNonQuery();
conn.Close();
conn.Open();
objcmd = new MySqlCommand("insert into produtos_disp(COD_DISPENSACAO,COD_PRODUTO,PRODUTO,QUANTIDADE) values (?,?,?,?)", conn);
string selectid = "select ifnull (max(ID),1) from dispensacao";
objcmd = new MySqlCommand(selectid, conn);
MySqlDataReader reader = objcmd.ExecuteReader();
if (reader.Read())
{
Txtcodigo.Text = reader.GetString("ID");
}
//Txtcodigo.DataBindings.Add("Text", dtid, "ID");
objcmd.Parameters.AddWithValue("#COD_DISPENSACAO", Txtcodigo.Text);
objcmd.Parameters.AddWithValue("#COD_PRODUTO", dtproddisp.Rows[0][0]);
objcmd.Parameters.AddWithValue("#PRODUTO", dtproddisp.Rows[0][1]);
objcmd.Parameters.AddWithValue("#PRODUTO", dtproddisp.Rows[0][2]);
Code from the comment
string selectQuery = "SELECT * from departamento";
connection.Open();
MySqlCommand command = new MySqlCommand(selectQuery, connection);
MySqlDataReader reader = command.ExecuteReader();
DataTable dt2 = new DataTable();
dt2.Load(reader);
Cmbdestinatario.DisplayMember = "nome";
Cmbdestinatario.ValueMember = "CODIGO";
Cmbdestinatario.DataSource = dt2;
Txtcodigodep.DataBindings.Add("Text", dt2, "CODIGO");
The first part is working, I can see records inserted on dispensacao table, but the second isn't working, error:
Could not find specified column in results: ID
and I need to get products from datagridview,
App screen:
MySQL Dispensacao table:
My problem now is inserting those selected products from datagridview on database and get the id from dispensacao to insert on products table,
If you want to insert more rows in a database(from what I known), you should add a checkbox in a DataGridView Column and store checked rows to a list. Then you should use a for loop to insert each data to Database by list values.
If you want the code please comment me.
Related
I am trying to update my data in a SQL Server database through C#. I am getting updated. But the problem is the data is updated twice.
For example I have 10 (int) in my balance and if I add another 10, it turns to 30.
Any help would be appreciated.
Here is my code:
protected void LoginClick(object sender, EventArgs e)
{
DataTable dr = new DataTable();
string email = txtEmail.Text;
SqlConnection con = new SqlConnection(Ws.Con);
con.Open();
int s = Convert.ToInt32(add.Text);
SqlCommand cmd = new SqlCommand("Update [Order] set Balance=Balance+'" + s + "',Card='" + card.Text + "' where email=#email ", con);
cmd.Parameters.AddWithValue("email", email);
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
sda.Fill(dt);
int i = cmd.ExecuteNonQuery();
con.Close();
}
I would like to rectify few mistakes in your code,
DataTable is not needed to execute the update query, ExecuteNonQuery will do the job
The adapter.Fill and ExecuteNonQuery do the same job here and that's why your updates happening twice
Make use of parameterization while dealing with user inputs to avoid exceptions
For parsing integers use int.TryParse instead for Convert.ToInt32
I think the following code would help you to do the same function in a smarter way:
int currentBalance = 0;
if(int.TryParse(txtAdd.Text, out currentBalance))
{
string querSql = "Update [Order] set Balance = Balance + #balance," +
" Card = #card where email = #email"
using (SqlConnection dbConn = new SqlConnection("connectionString here"))
{
dbConn.Open();
using (SqlCommand sqlCommand = new SqlCommand(querySql, dbConn))
{
sqlCommand.Parameters.Add("#balance", SqlDbType.int).value = currentBalance;
sqlCommand.Parameters.Add("#card", SqlDbType.VarChar).value = card.Text;
sqlCommand.Parameters.Add("#email", SqlDbType.VarChar).value = email;
sqlCommand.ExecuteNonQuery();
}
}
}
Please note: YOu are parsing the balance as an integer value, so I assume the column Balance is an integer field in the database, if not make use of corresponding datatype for the parameter #balance also update the parsing technique
As per the documentation:
SqlDataAdapter(SqlCommand)
Initializes a new instance of the SqlDataAdapter class with the specified SqlCommand as the SelectCommand property.
What is going wrong in your code?
Actually you are passing SqlDataAdapter your update query as the Select command. So now when you will use this instance of SqlDataAdapter to Fill your datatable then actually you are executing your Update command. Look at the following code along with comments to see what is going wrong:
DataTable dr = new DataTable();
string email = txtEmail.Text;
SqlConnection con = new SqlConnection(Ws.Con);
con.Open();
int s = Convert.ToInt32(add.Text);
SqlCommand cmd = new SqlCommand("Update [Order] set Balance=Balance+'" + s + "',Card='" + card.Text + "' where email=#email ", con);
cmd.Parameters.AddWithValue("email", email);
SqlDataAdapter sda = new SqlDataAdapter(cmd);//The Select command for SqlDataAdapter
//is actually now the update command specified by cmd instnace of SqlCommand
DataTable dt = new DataTable();
sda.Fill(dt);//here SqlDataAdapter will execute it's Select command which is actually set
//to an update statement so your record will be updated
int i = cmd.ExecuteNonQuery();//and here again the update command is being executed now
//directly using the SqlCommand cmd instance and thus your record gets updated twice
con.Close();
Fixed Code:
DataTable dr = new DataTable();
string email = txtEmail.Text;
SqlConnection con = new SqlConnection(Ws.Con);
con.Open();
int s = Convert.ToInt32(add.Text);
SqlCommand cmd = new SqlCommand("Update [Order] set Balance=Balance+'" + s + "',Card='" + card.Text + "' where email=#email ", con);
cmd.Parameters.AddWithValue("email", email);
//Create a new SqlComamnd
SqlCommand selectCommand = new SqlCommand("Select * from [Order]");
//Put the newly created instance as SelectCommand for your SqlDataAdapter
SqlDataAdapter sda = new SqlDataAdapter(selectCommand);
DataTable dt = new DataTable();
sda.Fill(dt);
int i = cmd.ExecuteNonQuery();
con.Close();
Hope this help and do have a look at the documentation for better understanding of the SqlDataAdapter and DataTable. Thanks.
I have 2 DGV in my C# application, then i write my code. Code for both DGV exactly same, but only 1 DGV can display the data. Why?
Anyone can help? if want to see the output, can email me: candy.9639#gmail.com
PS: my reputation is not enough to allow me post image here.
C#:
private void LoadData()
{
string MyConnectionString = "Server=31.220.XX.XX;Database=XXXXX_fyp;Uid=XXXXX_eee2110;Pwd=myPW;";
MySqlConnection connection = new MySqlConnection(MyConnectionString);
MySqlCommand cmd = connection.CreateCommand();
MySqlDataAdapter adap = new MySqlDataAdapter(cmd);
connection.Open();
cmd.CommandText = "SELECT tablenum, name, quantity FROM ordertable where tablenum = '1' & status = '1'";
DataSet ds = new DataSet();
adap.Fill(ds);
kitchen1_dgv.DataSource = ds.Tables[0].DefaultView;
cmd.CommandText = "SELECT tablenum, name, quantity FROM ordertable where tablenum = '16' & status = '1'";
DataSet ds2 = new DataSet();
adap.Fill(ds2);
kitchen2_dgv.DataSource = ds2.Tables[0].DefaultView;
if (connection.State == ConnectionState.Open)
{
connection.Clone();
connection.Close();
}
}
Salam Alekom .
I have comboBox filling it from database as
SqlConnection con = new SqlConnection(strcon);
con.Open();
SqlCommand scm = new SqlCommand();
scm.Connection = con;
scm.CommandText = "select * from com";
SqlDataAdapter adpt = new SqlDataAdapter(scm);
DataTable dt = new DataTable();
adpt.Fill(dt);
comboBox1.DataSource = dt;
comboBox1.DisplayMember = dt.Columns["com_name"].ToString();
comboBox1.ValueMember = dt.Columns["com_id"].ToString();
Where filling with all data that store in the table from database.
This comboBox use also to insert to another table in database
This also poses no problem
The problem when making search in table to get some data. I need to get the text value that store in table and equal to text value of comboBox and sort it in position 0 of this comboBox
I made the search no problem but what property or method that allow me to put the value in position 0 with out affecting the other values that be in combobox
SqlConnection con = new SqlConnection(strcon);
con.Open();
using(SqlCommand scm2 = new SqlCommand())
{
scm2 .Connection = con;
scm2.CommandType = CommandType.StoredProcedure;
scm2 .CommandText = "SP_retrieve_data";
scm2.Parameters.AddWithValue ("#id", textBox1.Text);
SqlDataReader dr = scm2.ExecuteReader();
while (dr.Read())
{
comboBox1. = dr["com_name"].ToString();//what code accept the value
}
}
string constr = #"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\Users\yogi\Documents\mydb.mdb";
string cmdstr = "select * from quant_level1";
OleDbConnection con = new OleDbConnection(constr);
OleDbCommand com = new OleDbCommand(cmdstr, con);
con.Open();
OleDbDataReader reader = com.ExecuteReader();
reader.Read();
DataSet data = new DataSet();
int i = data.Tables["quant_level1"].Rows.Count;
Label2.Text = i.ToString();
use
string cmdstr = "SELECT COUNT(*) FROM quant_level1";
With com.ExecuteScalar()
using(OleDbConnection conn = new OleDbConnection(constr))
using(OleDbCommand command = new OleDbCommand(cmdstr, conn))
{
conn.Open();
int count = (int)command.ExecuteScalar();
}
ExecuteScalar returns the first column of the first row in the result set returned by the query, here it give you row count.
you can use OleDbDataReader as you try in your code sample. but need to change the logic bit.
using (OleDbConnection con = new OleDbConnection(constr))
using (OleDbCommand com = new OleDbCommand("select * from quant_level1", con))
{
con.Open();
using (OleDbDataReader myReader = com.ExecuteReader())
{
DataTable dt = new DataTable();
dt.Load(myReader);
int count = dt.Rows.Count;
}
}
Why you fail!
You have created data set but you haven't load data to dataset using your DataReader. So you will get zero row count at the end.
Looks like that you want to fill your DataSet and count the rows later:
DataSet data = new DataSet();
OleDbDataAdapter da = new OleDbDataAdapter(com);
da.Fill(data);
int i = data.Tables[0].Rows.Count;
Label2.Text = i.ToString();
If you just want to count the rows, you can change the query to SELECT COUNT(*) FROM quant_level1 and get the return value like this:
int i = (int) com.ExecuteScalar();
Label2.Text = i.ToString();
You should do something like this:
Select count(*) from quant_level1
Change the command syntax executescalar to retrieve a single value
CommandText = "SELECT COUNT(*) FROM region";
Int32 count = (int32) ExecuteScalar();
Hope this can enlighten you a bit
I want to populate data from a SQL Server database from many columns to many textboxes .. I have a code to populate just one box .. can someone edit my code... I want to pull data and show it in Name, Address, Telephone No and Date ... plz help .. this code works for only one textbox..
Thanks in advance
SqlConnection Conn = new SqlConnection(#"Data Source=rex;Initial Catalog=PersonalDetails;Integrated Security=True");
SqlCommand Comm1 = new SqlCommand("Select * From PersonalUsers ", Conn);
Conn.Open();
SqlDataReader DR1 = Comm1.ExecuteReader();
if (DR1.Read())
{
Name.Text = DR1.GetValue(0).ToString();
}
while (DR1.Read())
{
if(DR1.GetName() == "YourSQLColumnName")
{
YourTextBox.Text = (string) DR1["YourSQLColumnName"];
}
// Your Other textboxes and columns which you want to match should follow as this template
}
SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, _conn);
SqlDataReader rdr = cmd.ExecuteReader();
System.Data.DataTable tbl = new System.Data.DataTable("Results");
tbl.Load(rdr);
if (tbl.Rows.Count > 0)
Name.Text = tbl.Rows[0]["column_name"].ToString();
string cs=System.Configuration.ConfigurationManager.ConnectionString["DBCS"].ConnectionString;
using(OracleConnection con=new OracleConnection(cs))
{
sql="select empname from Emp where empno='"+empno+"'";
OracleCommand cmd = new System.Data.OracleClient.OracleCommand(sql,con);
con.Open();
OracleDataReader rdr = cmd.ExecuteReader();
if(rdr.Read())
{
EmpName.Text=Convert.ToString(rd["empname"]);
}
}
I assume that you would like to take care of both more rows and more columns.
Try to specify the columns. It works without, but the performance is better if you do so.
I assume you have a class called PersonalUser with the specifed properties.
It is also nice to have it in an sorted order, so I added that
public List<PersonalUser> FetchMyData()
{
SqlConnection Conn = new SqlConnection(#"Data Source=rex;Initial Catalog=PersonalDetails;Integrated Security=True");
SqlCommand Comm1 = new SqlCommand("Select Name, Address, TelephoneNo,Date From PersonalUsers order by Name", Conn);
Conn.Open();
SqlDataReader DR1 = Comm1.ExecuteReader();
var result = new List<PersonalUser>();
while (DR1.Read())
{
result.Add(new PersonalUser {
Name = DR1.GetString(0);
Address= DR1.GetString(1);
TelephoneNo = DR1.GetString(2);
Date = DR1.GetString(3)
}
);
}
return result;
}
I would also, if the need is getting much complex than this, conidering using Entity Framwork..