DBCP连接池的最简单应用(用于Oracle数据库)

文章由LinuxBoy分享于2019-03-30 08:03:47热评（329）

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 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();
}

}

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DBCP连接池的最简单应用(用于Oracle数据库)