Develop Reference

OleDb Update database.mdb

When i use the CustomButton for to save the "Full_Name" in the Database [Rooms] => Person then there is just nothing happen. Also if i use the try & catch function, there will be no Exception.
The field in the Database stays Empty.
When i show the required variable in the MessageBox (idPlus2, Full_Name) then it throws me back the right informations.
So i think the problem must be in the UPDATE Sql string but i don't know whats wrong.
private string connstr = #"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\....mdb";
//Path anonymous
string Full_Name;
[Obsolete]
private void customButton1_Click(object sender, EventArgs e)
{
conn = new OleDbConnection(connstr);
conn.Open();
strSQL = "SELECT * FROM [Guests] WHERE ID = ?";
cmd = new OleDbCommand(strSQL, conn);
da = new OleDbDataAdapter(cmd);
int id = CustomComboBox1.SelectedIndex;
int idPlus = id + 1;
cmd.Parameters.Add("?", idPlus);
OleDbDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
Full_Name = reader["Vorname"].ToString() + ' ' + reader["Nachname"].ToString();
}
reader.Close();
string insertQuery = #"UPDATE [Rooms] SET Person = #Full_Name WHERE ID = ?";
cmd = new OleDbCommand(insertQuery, conn);
int id2 = customComboBox2.SelectedIndex;
int idPlus2 = id2 + 2;
cmd.Parameters.Add("?", idPlus2);
cmd.Parameters.Add(new OleDbParameter("#Full_Name", Full_Name));
cmd.CommandType = CommandType.Text;
cmd.ExecuteNonQuery();
conn.Close();
LoadTheme();
}

I have the answer
cmd.Parameters.Add("?", OleDbType.VarChar, 255).Value = CustomComboBox1.Texts;
cmd.Parameters.Add("?", idPlus2);
With OleDb you have to use ? for each variable or object which should be added to the database. That means that you can't specify the variable by name in the SQL string. You have to use the same order as the SQL string in C # code to insert the parameters.

SQL Server stored procedure return value to string [duplicate]

This question already has answers here:
Fetch scope_identity value in C# code from stored procedure in 3 tier architecture
(2 answers)
Closed 4 years ago.
I have a stored procedure that will return the SCOPE_IDENTITY() which is the ID for the row just added.
I have run the procedure from my C# application and adds the correct data to the database. What I need is for this returned value to be stored as a string in C~ so I can populate a text box in the UI.
SqlConnection con = new SqlConnection(connectionString);
con.Open();
SqlDataAdapter aa = new SqlDataAdapter("sp_insert_order", con);
aa.SelectCommand.CommandType = CommandType.StoredProcedure;
aa.SelectCommand.Parameters.Add("#customer_id", SqlDbType.VarChar, (50)).Value = comboBox1.SelectedItem;
aa.SelectCommand.ExecuteNonQuery();
con.Close();
Changed to
SqlConnection con = new SqlConnection(connectionString);
con.Open();
SqlDataAdapter aa = new SqlDataAdapter("sp_insert_order", con);
aa.SelectCommand.CommandType = CommandType.StoredProcedure;
aa.SelectCommand.Parameters.Add("#customer_id", SqlDbType.VarChar, (50)).Value = comboBox1.SelectedItem;
object oString = aa.SelectCommand.ExecuteScalar();
string myString = "";
if (oString != null)
{
myString = oString.ToString();
textBox1.Text = myString;
}
Textbox1 is still blank. :(

Ok, we're assuming your SProc is returning properly. Try assigning an output parameter as follows:
SqlConnection cnx = new SqlConnection(WebConfigurationManager.ConnectionStrings["yourConnName"].ConnectionString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = cnx;
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "testSProc";
cmd.Parameters.AddWithValue("name", "test Name");
SqlParameter outputParam = cmd.Parameters.Add("outID", SqlDbType.Int);
outputParam.Direction = ParameterDirection.Output;
object oString;
cnx.Open();
cmd.ExecuteNonQuery();
cnx.Close();
TextBox1.Text = outputParam.Value.ToString();

Adding parameters to PL/SQL in visual studio

I have written a procedure-
create or replace procedure cv(x in int,y in int,z in varchar)
as
cursor c
is
select email,collegename,cgpa,compname
from student_cv
where (cgpa>=x and yearsofexp>=y) and compname=z;
tem c%rowtype;
begin
open c;
loop
fetch c into tem;
exit when c%notfound;
insert into temp values(tem.email,tem.collegename,tem.cgpa,tem.compname);
end loop;
end;
/
and now based on two combo box values(which the user inputs) and 1 local string constitute the parameters passed to my procedure.
This is the code I am using-
//DB_connect();
string oracleb = "Data source=HPPRO58; user ID=system; password=deb;";
conn = new OracleConnection(oracleb);
//conn.Open();
conn.Open();
String x3 = "google";
String x1 ;
String x2;
String s1 = "delete from temp";
OracleCommand comm = new OracleCommand(s1, conn);
comm.ExecuteNonQuery();
// System.Data.OracleClient.OracleCommand comm2 = new System.Data.OracleClient.OracleCommand();
OracleCommand comm2 = new OracleCommand();
String s2 = "cv";
comm2.Connection = conn;
comm2.CommandText = s2;
comm2.CommandType = CommandType.StoredProcedure;
comm2.Parameters.Add("x", System.Data.OracleClient.OracleType.Number).Value = comboBox1.Text;
comm2.Parameters.Add("y", System.Data.OracleClient.OracleType.Number).Value = comboBox2.Text;
comm2.Parameters.Add("z", System.Data.OracleClient.OracleType.VarChar).Value = x3;
//comm.Parameters.Add("x", OracleType.Number).Value = comboBox1.Text;
comm2.ExecuteNonQuery();
String s3 = "select * from temp";
OracleCommand comm3 = new OracleCommand(s3, conn);
OracleDataAdapter MyAdapter3 = new OracleDataAdapter();//adapter acts as interface btw database and dataset(which is collectio of tables)
MyAdapter3.SelectCommand = comm;
DataTable dTable3 = new DataTable();//datatable represents a single table in database
MyAdapter3.Fill(dTable3);
dataGridView1.DataSource = dTable3;
conn.Close();
but on running this code the error displayed is -
and line 59 is -
comm2.Parameters.Add("x", System.Data.OracleClient.OracleType.Number).Value = comboBox1.Text;
therefore I think there is some problem in declaring the parameters in my code

Create Procedure that have parametre?

this is my code :
using (MySql.Data.MySqlClient.MySqlConnection cn = new
MySql.Data.MySqlClient.MySqlConnection(
Properties.Settings.Default.CONNNConnectionString))
{
cn.Open();
MySql.Data.MySqlClient.MySqlCommand cm = new
MySql.Data.MySqlClient.MySqlCommand();
cm.CommandType = CommandType.Text;
cm.Connection = cn;
cm.CommandText="CREATE PROCEDURE `GetMovement`(RefArtt vARCHAR(20),idos INTEGER) "+
"BEGIN "+
"SET #Qt=0; "SELECT * ,#Qt:=#Qt+qteliv-qtesor as stock FROM tableInOut;"+
"End";
cm.ExecuteNonQuery();}
Exception : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''#Qt'=0; SELECT * ...

I did not understand your query 100%:
SELECT * ,#Qt:=#Qt+qteliv-qtesor as stock FROM tableInOut;
If you can explain so that I adjust my code if needed, but here is an example:
using (MySql.Data.MySqlClient.MySqlConnection cn = new
MySql.Data.MySqlClient.MySqlConnection(
Properties.Settings.Default.CONNNConnectionString))
{
cn.Open();
MySql.Data.MySqlClient.MySqlCommand cm = new
MySql.Data.MySqlClient.MySqlCommand();
cm.CommandType = CommandType.Text;
cm.Connection = cn;
cm.CommandText=#"
DELIMITER //
CREATE PROCEDURE GetMovement(IN RefArtt VARCHAR(20), IN idos INTEGER)
BEGIN
SELECT *
FROM tableInOut
WHERE ref = RefArtt AND id = idos;
END //
DELIMITER ;
";
cm.ExecuteNonQuery();
}

insert data to table based on another table C#

I wrote some code that takes some values from one table and inserts the other table with these values.(not just these values, but also these values(this values=values from the based on table))
and I get this error:
System.Data.OleDb.OleDbException (0x80040E10): value wan't given for one or more of the required parameters.`
here's the code. I don't know what i've missed.
string selectedItem = comboBox1.SelectedItem.ToString();
Codons cdn = new Codons(selectedItem);
string codon1;
int index;
if (this.i != this.counter)
{
//take from the DataBase the matching codonsCodon1 to codonsFullName
codon1 = cdn.GetCodon1();
//take the serialnumber of the last protein
string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" +
"Data Source=C:\\Projects_2012\\Project_Noam\\Access\\myProject.accdb";
OleDbConnection conn = new OleDbConnection(connectionString);
conn.Open();
string last= "SELECT proInfoSerialNum FROM tblProInfo WHERE proInfoScienceName = "+this.name ;
OleDbCommand getSerial = new OleDbCommand(last, conn);
OleDbDataReader dr = getSerial.ExecuteReader();
dr.Read();
index = dr.GetInt32(0);
//add the amino acid to tblOrderAA
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
string insertCommand = "INSERT INTO tblOrderAA(orderAASerialPro, orderAACodon1) "
+ " values (?, ?)";
using (OleDbCommand command = new OleDbCommand(insertCommand, connection))
{
connection.Open();
command.Parameters.AddWithValue("orderAASerialPro", index);
command.Parameters.AddWithValue("orderAACodon1", codon1);
command.ExecuteNonQuery();
}
}
}
EDIT:I put a messagebox after that line:
index = dr.GetInt32(0);
to see where is the problem, and I get the error before that. I don't see the messagebox

Your SELECT Command has a syntax error in it because you didn't enclose it with quotes.
Change this:
string last = "SELECT proInfoSerialNum FROM tblProInfo WHERE proInfoScienceName = "+this.name ;
OleDbCommand getSerial = new OleDbCommand(last, conn);
OleDbDataReader dr = getSerial.ExecuteReader();
to
string last = "SELECT proInfoSerialNum FROM tblProInfo WHERE proInfoScienceName = ?";
OleDbCommand getSerial = new OleDbCommand(last, conn);
getSerial.Parameters.AddWithValue("?", this.name);
OleDbDataReader dr = getSerial.ExecuteReader();

This code is example from here:
string SqlString = "Insert Into Contacts (FirstName, LastName) Values (?,?)";
using (OleDbConnection conn = new OleDbConnection(ConnString))
{
using (OleDbCommand cmd = new OleDbCommand(SqlString, conn))
{
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("FirstName", txtFirstName.Text);
cmd.Parameters.AddWithValue("LastName", txtLastName.Text);
conn.Open();
cmd.ExecuteNonQuery();
}
}
Try to do the same as in the example.