====== Java ======


===== Parsear un fichero XML =====

El código mínimo para obtener un **document** a partir de un fichero XML:

<code java>
javax.xml.parsers.DocumentBuilderFactory dbf = javax.xml.parsers.DocumentBuilderFactory.newInstance();
javax.xml.parsers.DocumentBuilder db = dbf.newDocumentBuilder();
org.w3c.dom.Document doc = db.parse(new java.io.File("c:/ruta/al/fichero.xml"));
</code>


===== Llamar a un procedimiento almacenado =====

Aquí hay un ejemplo que trata prácticamente todos los casos en la ejecución de un procedimiento almacenado usando JDBC: parámetros de entrada y salida, retorno de resultados, etc.

<code java>
package DBTest;

import java.sql.*;

public class JdbcTest {

    private String          msDbUrl = "jdbc:odbc:ms";
    private String          msJdbcClass = "sun.jdbc.odbc.JdbcOdbcDriver";
    private Connection      mcDbAccess;
    private CallableStatement       msProcedure;

    public JdbcTest() {
        try {
            Class.forName( msDbUrl ).newInstance();
            mcDbAccess = DriverManager.getConnection( msJdbcClass, "milestone", "milestone" );
            msProcedure = mcDbAccess.prepareCall(
                "{? = call sp_sav_Bom_Header( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ) }"
            );
            msProcedure.registerOutParameter( 1, java.sql.Types.VARCHAR );
            msProcedure.setInt( 2, -1 );
            msProcedure.setInt( 3, 39 );
            msProcedure.setString( 4, "format" );
            long ltTest = new java.util.Date().getTime();
            System.out.println( "Today: " + ltTest );
            msProcedure.setTimestamp( 5, new Timestamp( ltTest ) );
            msProcedure.setString( 6, "type" );
            msProcedure.setString( 7, "submitter" );
            msProcedure.setString( 8, "email" );
            msProcedure.setString( 9, "phone" );
            msProcedure.setString( 10, "comments" );
            msProcedure.setString( 11, "label" );
            msProcedure.setInt( 12, 52 );
            msProcedure.setBoolean( 13, true );
            msProcedure.setBoolean( 14, false );
            msProcedure.setInt( 15, 53 );
            msProcedure.setString( 16, "runtime" );
            msProcedure.setString( 17, "configuration" );
            msProcedure.setBoolean( 18, true );
            msProcedure.setBoolean( 19, false );
            msProcedure.setString( 20, "special instructions" );
            msProcedure.setInt( 21, 54 );

            ResultSet lrsReturn = null;
            System.out.println( "Execute: " + (lrsReturn = msProcedure.executeQuery() ) );
            while( lrsReturn.next() ) {
                System.out.println( "Got from result set: " + lrsReturn.getInt( 1 ) );
            }
            System.out.println( "Got from stored procedure: " + msProcedure.getString( 1 ) );
        } catch( Throwable e ) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new JdbcTest();
    }
}
</code>