Too many database connections?

Question

I have a function that gets called repeatedly from inside a loop. The function opens a connection to the database(DriverManager.getConnection) when it is first called, and closes the connection to the database upon completetion. In addition to this, I have several "permanent" connections while the program is running. My question is, how expensive is making these connections? How many connections are too many?
Thanks,
cmp2

Answer 1

(1) Define a class (Say) MyConnection (like):
package general ;
import java.lang.* ;
import java.util.* ;
import java.sql.* ;
public class MyConnection
public boolean connected = false ;
public String user = "" ;
public String password = "" ;
public String URL = "" ;
public Connection theConnection;
public MyConnection() {
public void getConnection(
String parmUser,
String parmPass,
String parmConnection ) {
boolean connDriver = false ;
String connectionDriver = "oracle.jdbc.driver.OracleDriver" ;
String URLfrount = "jdbc:oracle:thin:@" ;
try {
// Make the Connection
Class.forName(connectionDriver);
connDriver = true ;
} catch ( ClassNotFoundException e ) {
messages.add( "Signon Driver ClassNotFoundException: " + e );
if ( connDriver ) {
try {
URL = URLfrount + parmConnection ;
theConnection = DriverManager.getConnection(URL, parmUser, parmPass);
theConnection.setAutoCommit( false ) ;
connected = true ;
user = parmUser.toUpperCase() ;
password = parmPass ;
} catch (SQLException e) {
messages.add( "Signon Error: " + e );
(2) pass this connection from class to class