DBCP连接池的最简单应用(用于ORACLE数据库)
鉴于有人问起DBCP直接用于JDBC连接的问题，我做了一个最简单的示例。所有资源来源于网上。它不需要什么Web容器，就是一简单的控制台应用。
资源：
http://apache.etoak.com//commons/pool/binaries/commons-pool-1.5.6-bin.zip
http://labs.renren.com/apache-mirror//commons/dbcp/binaries/commons-dbcp-1.4-bin.zip
http://download.java.net/maven/1/javaee/jars/javaee-api-5.jar
当然，还有oracle jdbc要用的ojdbc14.jar (适用于oracle9i及以上版本)
工程文件：放到这里了。http://dl.iteye.com/topics/download/210279f0-f752-37a6-969f-d58ba13cc394
数据库连接信息：
jdbc:oracle:thin:scott/tiger@sean-m700:1521:ora92
sean-m700是主机名，ora92是oracle数据库的instance ID. 我手头的机器上没有安装oracle数据库，用的是很早以前的一个oracle9.2的拷贝，重新安装实例和相应服务得来的。
源码如下：借化献佛，源码也是从网上得来的。(http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/doc/BasicDataSourceExample.java?revision=1100136&view=markup)
/*//33 // Here's a simple example of how to use the BasicDataSource.34 //35 36 //37 // Note that this example is very similiar to the PoolingDriver38 // example.39 40 //41 // To compile this example, you'll want:42 // * commons-pool-1.5.6.jar43 // * commons-dbcp-1.3.jar (JDK 1.4-1.5) or commons-dbcp-1.4 (JDK 1.6+)44 // * j2ee.jar (for the javax.sql classes)45 // in your classpath.46 //47 // To run this example, you'll want:48 // * commons-pool-1.5.6.jar49 // * commons-dbcp-1.3.jar (JDK 1.4-1.5) or commons-dbcp-1.4 (JDK 1.6+)50 // * j2ee.jar (for the javax.sql classes)51 // * the classes for your (underlying) JDBC driver52 // in your classpath.53 //54 // Invoke the class using two arguments:55 // * the connect string for your underlying JDBC driver56 // * the query you'd like to execute57 // You'll also want to ensure your underlying JDBC driver58 // is registered. You can use the "jdbc.drivers"59 // property to do this.60 //61 // For example:62 // java -Djdbc.drivers=oracle.jdbc.driver.OracleDriver \63 // -classpath commons-pool-1.5.6.jar:commons-dbcp-1.4.jar:j2ee.jar:oracle-jdbc.jar:. \64 // PoolingDataSourceExample65 // "jdbc:oracle:thin:scott/tiger@myhost:1521:mysid"66 // "SELECT * FROM DUAL"*//*The Oracle connection URL for the thin client-side driver ojdbc14.jar has the following format:jdbc:oracle:thin:[user/password]@[host][:port]:SIDjdbc:oracle:thin:[user/password]@//[host][:port]/SID user - The login user name defined in the Oracle server. password - The password for the login user. host - The host name where Oracle server is running. Default is 127.0.0.1 - the IP address of localhost. port - The port number where Oracle is listening for connection. Default is 1521. SID - System ID of the Oracle server database instance. SID is a required value. By default, Oracle Database 10g Express Edition creates one database instance called XE.*/import org.apache.commons.dbcp.BasicDataSource;import javax.sql.*;import java.sql.*;public class TestDataSource{ /** * @param args */ public static void main(String[] args) { System.out.println("Setting up data source."); String url = "jdbc:oracle:thin:scott/tiger@sean-m700:1521:ora92"; DataSource dataSource = setupDataSource(url); System.out.println("Done..."); // Now, we can use JDBC DataSource as we normally would. // Connection conn = null; Statement stmt = null; ResultSet rset = null; try { System.out.println("Creating connection."); conn = dataSource.getConnection(); System.out.println("Creating statement."); stmt = conn.createStatement(); System.out.println("Executing statement."); rset = stmt.executeQuery("select 1 from DUAL"); System.out.println("Results:"); int numcols = rset.getMetaData().getColumnCount(); while(rset.next()) { for(int i=1;i<=numcols;i++) { System.out.print("\t" + rset.getString(i)); } System.out.println(""); } } catch(SQLException e) { e.printStackTrace(); } finally { try { if (rset != null) rset.close(); } catch(Exception e) { } try { if (stmt != null) stmt.close(); } catch(Exception e) { } try { if (conn != null) conn.close(); } catch(Exception e) { } } } public static DataSource setupDataSource(String connectURI) { BasicDataSource ds = new BasicDataSource(); ds.setDriverClassName("oracle.jdbc.driver.OracleDriver"); ds.setUsername("scott"); ds.setPassword("tiger"); ds.setUrl(connectURI); return ds; } public static void printDataSourceStats(DataSource ds) { BasicDataSource bds = (BasicDataSource) ds; System.out.println("NumActive: " + bds.getNumActive()); System.out.println("NumIdle: " + bds.getNumIdle()); } public static void shutdownDataSource(DataSource ds) throws SQLException { BasicDataSource bds = (BasicDataSource) ds; bds.close(); }}