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)
- /*
- //
- 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。