2026-03-12 20:23:15

tpt/demos/SelectCount.java

@@ -0,0 +1,42 @@
+// run with:
+// java -cp $ORACLE_HOME/jdbc/lib/ojdbc5.jar:. Client_id
+
+
+import java.sql.*;
+import oracle.jdbc.OracleConnection;
+
+public class SelectCount {
+
+    public static void main(String[] args) throws InterruptedException {
+
+        try {
+            // get connection and statement
+            DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
+            Connection conn = DriverManager.getConnection( "jdbc:oracle:thin:@oel6:1521:LIN112", "system","oracle");
+            Statement stmt = conn.createStatement();
+            
+            // set metrics for connection (will be sent to server the next rountrip)
+            String[] metrics = new String[OracleConnection.END_TO_END_STATE_INDEX_MAX];
+            metrics[OracleConnection.END_TO_END_CLIENTID_INDEX]="Tanel Poder";
+            ((OracleConnection)conn).setEndToEndMetrics(metrics,(short)0);
+            
+            // run your SQL code. the client identifier attribute is bundled with this roundtrip and automatically sent to server with this request
+            ResultSet rs = stmt.executeQuery("SELECT COUNT(*) c FROM dba_source");
+
+            // print output from v$session. here you should see this java program's session with client identifier set            
+            System.out.printf("\nCOUNT\n");
+            System.out.println("---------------------------------");
+            while (rs.next()) {
+                System.out.printf("%-10s\n", new Object[] {Integer.toString(rs.getInt("C"))} );
+            }
+
+            // Sleeping for 10 seconds. If you query the client_identifier from another session
+            // you'll see that the last client_identifier still remains set (is not automatically cleared
+            // upon statement completion)
+            Thread.sleep(10000);
+        }
+            catch (SQLException e) {
+          e.printStackTrace();
+        }         
+    }
+}