//Connect to the database using java.

Connection Connection = empty;

Stat = null statement;

Try {

class . forname(" Oracle . JDBC . driver . Oracle driver ")； //If it is db2, it is class.forname ("com.ibm.db2.jdbc.app.db2driver"). new instance()；

Conn = drivermanager.getconnection ("JDBC: Oracle: thin: @ dbserver:1521:demo", "user name" and "password");

string sqlString = " select * from Books "； //retrieve the SQL of the book

stat = conn . create statement()；

return stat . execute(SQL string)；

}catch (exception e){

//Exception handling

} Finally {

if(null！ = connected) {

conn . close()；

}

if(null！ = stat ){

stat . close()；

}

}