为Applet创建SQL数据库

Question

I am having a simple Applet running on a Eclipse. My requirement is to store some values(random id, name, account number) in SQL database from this applet. Later, I also need access this DB from a servlet, which is running on the same setup.

I am new to this and couldn't get any link for this development. Could someone give/guide me steps to create MySQL DB specific for my requirement and access from Applet(running on eclipse) and store values in it?

Answer 1

Kindly refer below link.

I'm sure you'll get your answer.

http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/ad/samples/jdbc/s-Applt-java.htm

public Connection getConnection() throws SQLException {

    Connection conn = null;
    Properties connectionProps = new Properties();
    connectionProps.put("user", this.userName);
    connectionProps.put("password", this.password);

    if (this.dbms.equals("mysql")) {
        conn = DriverManager.getConnection(
                   "jdbc:" + this.dbms + "://" +
                   this.serverName +
                   ":" + this.portNumber + "/",
                   connectionProps);
    } else if (this.dbms.equals("derby")) {
        conn = DriverManager.getConnection(
                   "jdbc:" + this.dbms + ":" +
                   this.dbName +
                   ";create=true",
                   connectionProps);
    }
    System.out.println("Connected to database");
    return conn;
}

Answer 2

I'd recommend that you break the problem into pieces.

Start with the database interface. Write a Java interface that describes all the methods you want to execute. SQL databases usually let you Create, Read, Update, and/or Delete (CRUD).

package persistence;

public interface DataAccess<K, V> {
   V find(K key);
   List<V> find();
   K save(V value);
   int update(V value);
   int delete(V value);
};

Implement this interface with a Java POJO. Test it thoroughly and put it aside.

Give an instance of that DAO to your servlet so it can access the database. Now all the servlet needs to do is listen for HTTP requests, bind and validate the parameters, figure out where to send the request, and package up the response. The database is already sorted.

Last step is the applet. Make it talk to your servlet by making requests to the URLs that the servlet expects and pass the HTTP parameters.