Question

I have the following method in my database class that returns a resultset for a given SQL statement:

public static ResultSet sqlStatement(String query) throws SQLException{
    ResultSet result = null; 
    Connection conn = connect();
    Statement newStatement = conn.createStatement(); 
    result = newStatement.executeQuery(query);
    conn.close();
    return result;
}

I want to close the connection to the database before i return the resultset but it throws the following exception:

java.sql.SQLException: out of memory

I’m a java noob and experimenting so any help is much appreciated.

Answer 1

In my past experience(No document or anything), I would understand the “ResultSet” like a pointer in C. I bet it would cache some rows from database when you execute your query..

Therefore, if you close connection and then try to use resultset, all those cached resultset does not have proper information and getting next cache etc. As a result, it would throw out of memory exception..

Anyway proper way to use those in java..

Connection con...
try{
    create connection
    execute query
    use your resultset completely..
}catch(...){
}finally{
    close connection;
}

Hope it would help