I am trying to save unicode data (greek) in oracle database (10 g). I have created a simple table:
I understand that NVARCHAR2 always uses UTF-16 encoding so it must be fine for all (human) languages.
Then I am trying to insert a string in database. I have hardcoded the string ("How are you?" in Greek) in code. Then I try to get it back from database and show it.
class Program
{
static string connectionString = "<my connection string>";
static void Main (string[] args) {
string textBefore = "Τι κάνεις;";
DeleteAll ();
SaveToDatabase (textBefore);
string textAfter = GetFromDatabase ();
string beforeData = String.Format ("Before: {0}, ({1})", textBefore, ToHex (textBefore));
string afterData = String.Format ("After: {0}, ({1})", textAfter, ToHex (textAfter));
Console.WriteLine (beforeData);
Console.WriteLine (afterData);
MessageBox.Show (beforeData);
MessageBox.Show (afterData);
Console.ReadLine ();
}
static void DeleteAll () {
using (var oraConnection = new OracleConnection (connectionString)) {
oraConnection.Open ();
var command = oraConnection.CreateCommand ();
command.CommandText = "delete from UNICODEDATA";
command.ExecuteNonQuery ();
}
}
static void SaveToDatabase (string stringToSave) {
using (var oraConnection = new OracleConnection (connectionString)) {
oraConnection.Open ();
var command = oraConnection.CreateCommand ();
command.CommandText = "INSERT into UNICODEDATA (ID, UNICODESTRING) Values (11, :UnicodeString)";
command.Parameters.Add (":UnicodeString", stringToSave);
command.ExecuteNonQuery ();
}
}
static string GetFromDatabase () {
using (var oraConnection = new OracleConnection (connectionString)) {
oraConnection.Open ();
var command = oraConnection.CreateCommand ();
command.CommandText = "Select * from UNICODEDATA";
var erpReader = command.ExecuteReader ();
string s = String.Empty;
while (erpReader.Read ()) {
string text = erpReader.GetString (1);
s += text + ", ";
}
return s;
}
}
static string ToHex (string input) {
string bytes = String.Empty;
foreach (var c in input)
bytes += ((int)c).ToString ("X4") + " ";
return bytes;
}
}
Here are different outputs:
Text before sending to database in a message box:
Text after getting from database in a message box:
Console Output:
Please can you suggest what I might be doing wrong here?
