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一个连接池的例子(来自JIVE)(4)
时间:2008-01-12 编辑:简简单单 来源:一聚教程网
//文件:DbConnectionManager.java
package com.qingtuo.db.pool;
import java.sql.*;
import java.io.*;
import java.util.*;
/**
* Central manager of database connections.
*/
public class DbConnectionManager {
private static DbConnectionProvider connectionProvider;
private static Object providerLock = new Object();
/**
* Returns a database connection from the currently active connection
* provider.
*/
public static Connection getConnection() {
if (connectionProvider == null) {
synchronized (providerLock) {
if (connectionProvider == null) {
//Create the connection provider -- for now, this is hardcoded. For
//the next beta, I'll change this to load up the provider dynamically.
connectionProvider = new DbConnectionDefaultPool();
connectionProvider.start();
}
}
}
Connection con = connectionProvider.getConnection();
package com.qingtuo.db.pool;
import java.sql.*;
import java.io.*;
import java.util.*;
/**
* Central manager of database connections.
*/
public class DbConnectionManager {
private static DbConnectionProvider connectionProvider;
private static Object providerLock = new Object();
/**
* Returns a database connection from the currently active connection
* provider.
*/
public static Connection getConnection() {
if (connectionProvider == null) {
synchronized (providerLock) {
if (connectionProvider == null) {
//Create the connection provider -- for now, this is hardcoded. For
//the next beta, I'll change this to load up the provider dynamically.
connectionProvider = new DbConnectionDefaultPool();
connectionProvider.start();
}
}
}
Connection con = connectionProvider.getConnection();
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