Question

I have a managed bean which makes SQL queries to Oracle database. This is just very simple example how I make SQL queries. This is the table structure:

GLOBALSETTINGS
---------------------------------
SessionTTL          VARCHAR2(40 BYTE)
MAXACTIVEUSERS  NUMBER
ACTIVEUSERS         VARCHAR2(20 BYTE)

I use this table just to store application settings. In the example listed below I can fetch just one string with one SQL statement. I want with SQL query to fetch the content of the three rows – SessionTTL, MAXACTIVEUSERS, ACTIVEUSERS. Is it possible?

   public String CheckUserDB(String userToCheck) throws SQLException {
        String storedPassword = null;        
        String SQL_Statement = null;

        if (ds == null) throw new SQLException();      
   Connection conn = ds.getConnection();
        if (conn == null) throw new SQLException();      

   try {
        conn.setAutoCommit(false);
        boolean committed = false;
            try {
                   SQL_Statement = "SELECT Passwd from USERS WHERE Username = ?";

                   PreparedStatement passwordQuery = conn.prepareStatement(SQL_Statement);
                   passwordQuery.setString(1, userToCheck);

                   ResultSet result = passwordQuery.executeQuery();

                   if(result.next()){
                        storedPassword = result.getString("Passwd");
                   }

                   conn.commit();
                   committed = true;
             } finally {
                   if (!committed) conn.rollback();
                   }
        }
            finally {               
            conn.close();

            }  

   return storedPassword;       
   }                         

P.S I want the content of the rows.

Answer 1

I’m hoping I understand what you are asking for, but I fear I don’t as it seems too simple, but anyway…

I think you want the contents of 3 columns, not rows. And yes you can, you just specify the columns you want returned in your SQL statement:

SELECT SessionTTL, MAXACTIVEUSERS, ACTIVEUSERS FROM GLOBALSETTINGS WHERE (condition)...

you can also use * as a shortcut for all columns iof you don’t want to explicitly specify them:

SELECT * FROM GLOBALSETTINGS WHERE (condition)...

Some background reading on SQL syntax might be useful