Simple mysql query Check in database

Question

Basically I'm just trying to chekc whether the user exists on the database.
Mysql Table has - name user, pass...
My servlet is issuing query - String sql = "SELECT * FROM users WHERE username'"+user'";
ResultSet rs = stmt.executeQuery(sql);
Question - how do i check if the query's result.
Simple user authentication via database. Sorry but im new to Java
Pls help

Answer 1

Mysql Table has - name user, pass...
My servlet is issuing query - String sql = "SELECT *
FROM users WHERE username'"+user'";Does this query work?
ResultSet rs = stmt.executeQuery(sql);
Question - how do i check if the query's result.
Simple user authentication via database. Sorry but
im new to JavaFor the simplest authentication, I would use
SELECT count(*) FROM users WHERE username = '<user>' and password = '<password>'
To read through the resultset for this query:
if(rs.next() && rs.getInt(1) > 0) {
    System.out.println("User validated");
} else {
    System.out.println("User credentials do not match");
}What you need is http://java.sun.com/docs/books/tutorial/jdbc/