Utf8 strings in jdbc

Question

I have a database with database code set UTF-8 containing a DB2 table TMP with a column C of character(10).
In this column, I would like to put the following string "\u2260", which is the 'not equal sign'.
What did I first?
String key = "A";
String nes = "\u2260";
PreparedStatement pst1 = aDbconn.prepareStatement("INSERT INTO TMP (KE, C) VALUES(?, ?)");
pst1.setString(1, key);
pst1.setString(2, nes);
if (pst1.executeUpdate() == 0) {
System.out.println("something went wrong");
pst.close();
aDbconn.commit()
Afterwards, I tried to retrieve this value with getString, but what was retrieved is not equal to what was inserted.
PreparedStatement pst2 = aDbconn.prepareStatement("SELECT KE, C FROM TMP WHERE KE = ?");
pst2.setString(1, key);
ResultSet rec = pst2.executeQuery();
if (rec.next()) {
String resultvalue = rec.getString("C");
if (resultvalue.equals(nes)) {
System.out.println("it is not equal");
Because, this did not work well( I got the message), I made the following change.
String key = "A";
String nes = "\u2260";
PreparedStatement pst1 = aDbconn.prepareStatement("INSERT INTO TMP (KE, C) VALUES(?, ?)");
pst1.setString(1, key);
byte[] bytes = nes.getBytes("UTF-8");
pst1.setBinaryStream(2, new ByteArrayInputStream(bytes), bytes.length);
if (pst1.executeUpdate() == 0) {
System.out.println("something went wrong");
pst.close();
aDbconn.commit()
PreparedStatement pst2 = aDbconn.prepareStatement("SELECT KE, C FROM TMP WHERE KE = ?");
pst2.setString(1, key);
ResultSet rec = pst2.executeQuery();
if (rec.next()) {
String resultvalue = new String(rec.getBytes("C"),"UTF-8").trim();
if (resultvalue.equals(nes)) {
System.out.println("it is not equal");
And this works fine.
Is this the way to work with utf8 ?
The string "\u2260" is after getBytes("UTF-8") three bytes long. Those three bytes were stored in a column of CHARACTER(10). When I stored it in a column of CHARACTER(5), I got an exception saying 'String too long'. Is this normal ?
Has someone experience with storing utf8-strings upon a database with jdbc ?

Answer 1

if (resultvalue.equals(nes)) {
System.out.println("it is not equal");
}Do I get you right: you print "it is not equal" if the value is equal?