I have the following problem. I want to connect my C# application with our SAP server, which works fine, but in addition, I want to a execute an RFC and read the output with ExecuteReader().
using Microsoft.Data.SapClient;
namespace SAPconnect2
{
class Program
{
static void Main(string[] args)
{
string connstr = "ASHOST=xxx; SYSNR=00; CLIENT=100; LANG=EN; USER=xxx; PASSWD=xxx;";
using (SapConnection conn = new SapConnection(connstr))
{
conn.Open();
using (SapCommand cmd = (SapCommand)conn.CreateCommand())
{
cmd.CommandText = "exec zrfc_test";
using (SapDataReader dr = (SapDataReader)cmd.ExecuteReader())
{
}
}
}
}
}
}
But when I execute the programme, I get the following error: additional information: Incorrect token found, expected a token of the following type: Describe, Execute, Select. [XtractQL/Command]
I also tried to follow this guide: https://msdn.microsoft.com/en-us/library/cc185499(v=bts.10).aspx
But when I remove (SapCommand) before conn.CreateCommand() and (SapDataReader) before cmd.ExecuteReader(), I generate error CS0266.
What do I have to do, to get this programme running?
Related
While working on legacy code, I ran into Specific scenario and made a dummy example to show the issue to ask for any suggestions. I get following error:
`
Program.cs(37,1) : warning : CA2100 : Microsoft.Security : The query string passed to 'OleDbCommand.CommandText.set(string)' in 'Program.Read(OleDbConnection, string)' could contain the following variables 'sqlQuery'. If any of these variables could come from user input, consider using a stored procedure or a parameterized SQL query instead of building the query with string concatenations.
My Code is:
class Program
{
static void Main ()
{
string connectionString = #"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\Newfolder\database1.mdb";
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
try
{
connection.Open();
string strsql = "SELECT * FROM Table1";
Read(connection,strsql);
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
static void Read (OleDbConnection connection,string sqlQuery)
{
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = sqlQuery;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Console.WriteLine(reader["PName"]);
}
}
}
Now I cannot go with the solution to suppress warning. There are several complicated situations from which i get these warnings, this is just a dummy simple example to show workflow.
So although the query being executed is safe, but since it comes outside of the function, it asks me to changed it to parametrized query.
As in Read() function, although my input paramter sqlQuery is not from user, but it will come from outside as an input parameter and I cannot move sqlQuery code within the Read() function, it will always come from outside based on which certain decisions are made.
So what can I do to make this redundant warning disapper?
My dummy Access databse snapshot is this:
I have tried going through Microsoft official documentation on it, but i was not able to come up with solution
I am trying to update 2 columns in an Oracle database using C#. The columns I want to update are StartTime i.e. a timestamp and Name i.e. string. However when I run my code, the application freezes. I following is my code:
public int StartProduction(string serialNr, string empName)
{
string queryString = "UPDATE RO_EXEMPLAAR_PIM SET PLAKTAFEL_START=systimestamp, STARTED_BY=:startedBy WHERE SERIENR=:serialNr";
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand command = new OracleCommand(queryString, connection))
{
try
{
OracleDataAdapter da = new OracleDataAdapter();
connection.Open();
command.Parameters.AddWithValue("serialNr", serialNr);
command.Parameters.AddWithValue("startedBy", empName);
da.InsertCommand = command;
int nrOfRecordsChanged = command.ExecuteNonQuery();
return nrOfRecordsChanged;
}
catch
{
return -1; //which means the try-block was not executed succesfully
}
finally
{
connection.Close();
}
}
}
}
I call it in a form as this:
if (dh.StartProduction(serialNr, empName) != -1)
{
MessageBox.Show("Production started successfully!");
}
else
{
MessageBox.Show("Production cannot be started!");
}
I looked up online and could not find what is wrong with my code. Thanks in advance!
Try a non locking read query like;
SELECT * FROM V$VERSION;
If that works (proving your connection string works).
Then you probably have a locking issue.
In general: (especially for devs)
Make sure you are not missing a "commit;" in your sql-developer or dbvisualizer or something like that. (or somebody on your dev team).
Running an update without a "commit;" in side these tools will lock a row.
If you can't find the culprit : a reboot of the server is in order.
For the past month I've been getting data with a C# program in tandem with a company's API. Just yesterday all the sudden it would no longer work, even though I haven't changed the code at all. Here's the code:
public string GetMatchCode()
{
//this could be loaded from config file or other source
string connectString = "Server=123.123.1.23;Database=blah_users;Uid=blah_data;Pwd=blahblah;";
string sql = "SELECT MAX(match_id) FROM `data_blah`";
using (var connect = new MySqlConnection(connectString))
using (var command = new MySqlCommand(sql, connect))
{
connect.Open();
return command.ExecuteScalar().ToString();
}
}
And I get this error:
An unhandled exception of type 'MySql.Data.MySqlClient.MySqlException' occurred in MySql.Data.dll
Additional information: Access denied for user 'blah_data'#'cpe-86-80-21-54.san.res.rr.com' (using password: YES)
Any idea what could have happened and how to fix it? The only thing I think could've happened is that my support ticket dealing with node.js compatibility was executed wrong by support employees. Thanks!
Your db user's permission has failed. The user may have been removed; the permissions may have been modified. Contact the db owner.
So it looks like you are not authenticating: Either incorrect credentials or server needs a different method. Try disabling "sslmode" like below:
public string GetMatchCode()
{
//this could be loaded from config file or other source
string connectString = "Server=123.123.1.23;Database=blah_users;Uid=blah_data;Pwd=blahblah;sslmode=none;";
string sql = "SELECT MAX(match_id) FROM `data_blah`";
using (var connect = new MySqlConnection(connectString))
using (var command = new MySqlCommand(sql, connect))
{
connect.Open();
return command.ExecuteScalar().ToString();
}
}
That should do it
string sql = "SELECT MAX(match_id) FROM `data_blah`";
Isn't it supposed to be " ' " instead of " ` " surrounding "data_blah"?
According to the examples in the IBM documentation (see this page) it should be possible in .NET to return a DB2 z/OS cursor from an anonymous block and loop over the results with a datareader, however the following code crashes with the following exception:
ERROR [42601] [IBM][DB2] SQL0104N An unexpected token "CURSOR1" was found following "". Expected tokens may include: "SECTION"."
Test code:
[Test]
public void Test()
{
using (var conn = new DB2Connection(ConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString))
{
conn.Open();
using (var cmd = new DB2Command("BEGIN " +
"DECLARE CURSOR1 CURSOR WITH RETURN TO CLIENT WITH HOLD FOR SELECT ID, DESCRIPTION FROM ITEMS; "+
"OPEN CURSOR1; "+
"END;", conn))
{
using (var rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
Console.WriteLine("{0}: {1}", rdr.GetString(0), rdr.GetString(1));
}
}
}
}
}
My database is a DB2 V10 database running on z/OS.
I'm using DB2 Connect V10.5.3...
Has anyone got this to work?
I'm a real noob in .NET and i'm trying to link a simple command line application (in C#) with a SQL server database. I'm now able to connect the program with the database but not to recover the data that are in it. Here is my code :
using System;
using System.Data;
using System.Data.SqlClient;
namespace ConsoleApplication1
{
class Program
{
static void Main()
{
string connectionString = GetConnectionString();
string queryString = "SELECT USER_ID FROM dbo.ISALLOCATEDTO;";
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand command = connection.CreateCommand();
command.CommandText = queryString;
try
{
connection.Open();
SqlDataReader reader = command.ExecuteReader();
int i = 0;
while (reader.Read())
{
i++;
Console.WriteLine("Field "+i);
Console.WriteLine("\t{0}",reader[0]);
}
reader.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
//Console.WriteLine("Hello world");
string x = Console.ReadLine();
}
static private string GetConnectionString()
{
return "Data Source=FR401388\\SQLEXPRESS;Initial Catalog=Test;";
+ "Integrated Security=SSPI";
}
}
}
But when i'm running it and even if my table is not empty (I've seen it in the sql server studio), I cannot recover the data by using the read() method.
What I've done so far : try to change the name of the datatable with a fake one : the datatable is not found (so the link between sql server database and programm seems to be valid).
I'm using Windows Authentication in sql server, dunno if it's changing anything... (Once again : i'm very new to all of that).
Thanks !
Your code should work.
A possible cause is: You are looking at a different database.
This is quite common if you use Server Explorer inside VS with a connectionstring different from the one used in code.