import java.sql.*;
import javax.sql.DataSource;
import com.mchange.v2.c3p0.DataSources;
/**
* This example shows how to programmatically get and directly use
* an pool-backed DataSource
*/
public final class UsePoolBackedDataSource
{
public static void main(String[] argv)
{
try
{
// Note: your JDBC driver must be loaded [via Class.forName( ... ) or -Djdbc.properties]
// prior to acquiring your DataSource!
// Acquire the DataSource... this is the only c3p0 specific code here
DataSource unpooled = DataSources.unpooledDataSource("jdbc:postgresql://localhost/test",
"swaldman",
"test");
DataSource pooled = DataSources.pooledDataSource( unpooled );
// get hold of a Connection an do stuff, in the usual way
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
try
{
con = pooled.getConnection();
stmt = con.createStatement();
rs = stmt.executeQuery("SELECT * FROM foo");
while (rs.next())
System.out.println( rs.getString(1) );
}
finally
{
//i try to be neurotic about ResourceManagement,
//explicitly closing each resource
//but if you are in the habit of only closing
//parent resources (e.g. the Connection) and
//letting them close their children, all
//c3p0 DataSources will properly deal.
attemptClose(rs);
attemptClose(stmt);
attemptClose(con);
}
}
catch (Exception e)
{ e.printStackTrace(); }
}
static void attemptClose(ResultSet o)
{
try
{ if (o != null) o.close();}
catch (Exception e)
{ e.printStackTrace();}
}
static void attemptClose(Statement o)
{
try
{ if (o != null) o.close();}
catch (Exception e)
{ e.printStackTrace();}
}
static void attemptClose(Connection o)
{
try
{ if (o != null) o.close();}
catch (Exception e)
{ e.printStackTrace();}
}
private UsePoolBackedDataSource()
{}
}