[转]DBCP连接池的最简单应用(用于ORACLE数据库)

http://blog.csdn.net/iihero/article/details/8254107

http://www.programgo.com/article/81693457907/
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)

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print?

/*

//

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 PoolingDriver

38 // example.

39

40 //

41 // To compile this example, you'll want:

42 // * commons-pool-1.5.6.jar

43 // * 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.jar

49 // * 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 driver

52 // in your classpath.

53 //

54 // Invoke the class using two arguments:

55 // * the connect string for your underlying JDBC driver

56 // * the query you'd like to execute

57 // You'll also want to ensure your underlying JDBC driver

58 // 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 // PoolingDataSourceExample

65 // "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]:SID

jdbc: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();

}

}

不过，需要说明的是，DBCP连接池是几个开源连接池里最不适合用于生产环境的，经常会出现死连接现象。 而cp30和proxool都是不错的选择。DBCP用于测评开发环境，还是比较便利的。