A question about PreparedStatement and ORA-03115 error

Question

Dear all,
I have an issue with JDBC and I would appreciate if you could kindly give me a hand.
I'm using:
- Oracle Database 11g Enterprise (Release 11.1.0.6.0)
- JDBC thin driver version: ( 11.1.0.7.0-Production)
- JDK 1.6
- Operating system: Linux (Ubuntu 8.10)
Here is my code
import java.sql.*;
public class Main
    public static void main(String[] args)
        String dbURL = "jdbc:oracle:thin:@localhost:1521:mydatabase";
        String username = "scott";
        String user_password = "tiger";
        try
            Connection connection = DriverManager.getConnection(dbURL, username, user_password);
            String query_text = "SELECT * FROM mytable";
            Statement statement = connection.createStatement();
            ResultSet query_result = statement.executeQuery(query_text);
            connection.close();
        catch (SQLException e)
            for (Throwable t: e)
                t.printStackTrace();
}This works pretty well without any problem. But when I want to use PreparedStatement instead of Statement I receive the ORA-03115 error message, that is, when I replace the Statement with PreparedStatement in the following way:
String query_text =
        "SELECT first_name, ?, id, ?, job_title, salary  FROM mytable "+
        "WHERE id IN ('id14', ?, 'id17', 'id18')";
PreparedStatement prepared_statement =  connection.preparedStatement(query_text);
prepared_statement.setString(1, "last_name");
prepared_statement.setString(2, "birthday");
prepared_statement.setString(3, "id02");
ResultSet query_result = prepared_statement.executeQuery(query_text);I get the following:
java.sql.SQLException: ORA-03115: unsupported network datatype or representation
     at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)
     at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:133)
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:206)
     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:455)
     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:413)
     at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:1034)
     at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:194)
     at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:791)
     at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:866)
     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1186)
     at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1377)
     at oracle.jdbc.driver.OracleStatementWrapper.executeQuery(OracleStatementWrapper.java:387)
     at mysqlpackage.Main.main(Main.java:33)Therefore, right after
ResultSet query_result = prepared_statement.executeQuery(query_text);the exception is thrown,
why it works with Statement but not with PreparedStatement? I tested with several other queries, insert a new row, delete a row, everytime it works well, but when I want to use PreparedStatement instead of Statement, again I have this error message.
Any idea?
Thanks in advance,

Answer 1

OK, I found myself the answer.
First error, I had use ? also for column names, which is not accepted as the SQL query has to be precompiled.
Second error: Instead of writing
ResultSet query_result =  prepared_statement.executeQuery(query_text);I had to write:
ResultSet query_result =  prepared_statement.executeQuery();I tested with the following
String query_text =
              "SELECT first_name, last_name, id, birthday, job_title, salary "+
              "FROM myenterprise "+
              "WHERE id IN (?, ?, ?, ?) ";
            PreparedStatement prepared_statement =
                    connection.prepareStatement(query_text);
            prepared_statement.setString(1, "id02");
            prepared_statement.setString(2, "id04");
            prepared_statement.setString(3, "id08");
            prepared_statement.setString(4, "id09");
            ResultSet query_result =  prepared_statement.executeQuery();And it works pretty well now! :)