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Apache DBCP BasicDatSource Setup

DBCP Simple DataSource Example Here’s a simple example of how to use the BasicDataSource. In this example, we’ll construct the BasicDataSource manually, but you could also configure it using an external conifguration file.
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import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;

//
// Here are the dbcp-specific classes.
// Note that they are only used in the setupDataSource
// method. In normal use, your classes interact
// only with the standard JDBC API
//
import org.apache.commons.dbcp.BasicDataSource;

//
// Note that this example is very similiar to the PoolingDriver
// example.

//
// To compile this example, you'll want:
// * commons-pool-1.5.4.jar
// * commons-dbcp-1.2.2.jar
// * j2ee.jar (for the javax.sql classes)
// in your classpath.
//
// To run this example, you'll want:
// * commons-pool-1.5.4.jar
// * commons-dbcp-1.2.2.jar
// * j2ee.jar (for the javax.sql classes)
// * the classes for your (underlying) JDBC driver
// in your classpath.
//
// Invoke the class using two arguments:
// * the connect string for your underlying JDBC driver
// * the query you'd like to execute
// You'll also want to ensure your underlying JDBC driver
// is registered. You can use the "jdbc.drivers"
// property to do this.
//
// For example:
// java -Djdbc.drivers=oracle.jdbc.driver.OracleDriver
// -classpath commons-pool-1.5.3.jar:commons-dbcp-1.2.2.jar:j2ee.jar:oracle-jdbc.jar:.
// ManualPoolingDataSourceExample
// "jdbc:oracle:thin:scott/tiger@myhost:1521:mysid"
// "SELECT * FROM DUAL"
//
public class BasicDataSourceExample {

public static void main(String[] args) {
// First we set up the BasicDataSource.
// Normally this would be handled auto-magically by
// an external configuration, but in this example we'll
// do it manually.
//
System.out.println("Setting up data source.");
DataSource dataSource = setupDataSource(args[0]);
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(args[1]);
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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