如何以编程方式设置 BIRT 报告的数据源？

我有一个连接到我们的测试数据库的 BIRT 报告。在生产环境中，我想提供一个由容器通过 jndi 提供的数据源。

如何以编程方式为给定报告设置数据源？

    ...
    IReportRunnable design = birtEngine.openReportDesign ( new File ( properties.getProperty ( "reportPath" ), report + ".rptdesign" ).getAbsolutePath () );
    IRunAndRenderTask task = birtEngine.createRunAndRenderTask ( design );

    PDFRenderOption options = new PDFRenderOption ();
    options.setOutputFormat ( PDFRenderOption.OUTPUT_FORMAT_PDF );
    options.setOutputStream ( out );
    task.setRenderOption ( options );
    for ( Entry<String, Object> entry : parameters.entrySet () )
    {
        task.setParameterValue ( entry.getKey (), entry.getValue () );
    }

    task.run ();
    task.close ();
    ...

我想我必须修改design但另一方面task有一个方法setDataSource但这看起来有点像我必须提供一些 xml dom 元素。

查看以下代码，您可能会在运行时提供数据源方面获得一些帮助。

对于我的要求，它工作得很好。

我从某个网站得到这个不记得了。

import java.io.IOException;
import java.util.ArrayList; 

import org.eclipse.birt.core.framework.Platform;
import org.eclipse.birt.report.model.api.CellHandle;
import org.eclipse.birt.report.model.api.DataItemHandle;
import org.eclipse.birt.report.model.api.DesignConfig; 
import org.eclipse.birt.report.model.api.ElementFactory;
import org.eclipse.birt.report.model.api.IDesignEngine;
import org.eclipse.birt.report.model.api.IDesignEngineFactory;
import org.eclipse.birt.report.model.api.LabelHandle;
import org.eclipse.birt.report.model.api.OdaDataSetHandle;
import org.eclipse.birt.report.model.api.OdaDataSourceHandle;
import org.eclipse.birt.report.model.api.PropertyHandle;
import org.eclipse.birt.report.model.api.ReportDesignHandle;
import org.eclipse.birt.report.model.api.RowHandle;
import org.eclipse.birt.report.model.api.SessionHandle;
import org.eclipse.birt.report.model.api.StructureFactory;
import org.eclipse.birt.report.model.api.TableHandle;
import org.eclipse.birt.report.model.api.activity.SemanticException;
import org.eclipse.birt.report.model.api.elements.structures.ComputedColumn;

import com.ibm.icu.util.ULocale;

/**
 * Dynamic Table BIRT Design Engine API (DEAPI) demo.
 */

public class DECreateDynamicTable
{
    ReportDesignHandle designHandle = null;
    ElementFactory designFactory = null;
    StructureFactory structFactory = null;  

    public static void main( String[] args )
    {
        try
        {
            DECreateDynamicTable de = new DECreateDynamicTable();
            ArrayList al = new ArrayList();
            al.add("USERNAME");
            al.add("COUNTRY");
            de.buildReport(al, "From GTM_REPORT_APP_USER" );
        }
        catch ( IOException e )
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch ( SemanticException e )
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    void buildDataSource( ) throws SemanticException
    {

        OdaDataSourceHandle dsHandle = designFactory.newOdaDataSource(
                "Data Source", "org.eclipse.birt.report.data.oda.jdbc" );
        dsHandle.setProperty( "odaDriverClass",
                "oracle.jdbc.driver.OracleDriver" );
        dsHandle.setProperty( "odaURL", "jdbc:oracle:thin:@xeon:1521:ora9i" );
        dsHandle.setProperty( "odaUser", "AIMS_GTMNE" );
        dsHandle.setProperty( "odaPassword", "AIMS_GTMNE" );

        designHandle.getDataSources( ).add( dsHandle );

    }

    void buildDataSet(ArrayList cols, String fromClause ) throws SemanticException
    {

        OdaDataSetHandle dsHandle = designFactory.newOdaDataSet( "ds",
                "org.eclipse.birt.report.data.oda.jdbc.JdbcSelectDataSet" );
        dsHandle.setDataSource( "Data Source" );
        String qry = "Select ";
        for( int i=0; i < cols.size(); i++){
            qry += " " + cols.get(i);
            if( i != (cols.size() -1) ){
                qry += ",";
            }

        }
        qry += " " + fromClause;

        dsHandle.setQueryText( qry );

        designHandle.getDataSets( ).add( dsHandle );



    }
    void buildReport(ArrayList cols, String fromClause ) throws IOException, SemanticException
    {


        //Configure the Engine and start the Platform
        DesignConfig config = new DesignConfig( );

        config.setProperty("BIRT_HOME", "D:/Softwares/Frame Works - APIs-Tools/birt-runtime-2_6_1/birt-runtime-2_6_1/ReportEngine");

        IDesignEngine engine = null;
        try{


            Platform.startup( config );
            IDesignEngineFactory factory = (IDesignEngineFactory) Platform.createFactoryObject( IDesignEngineFactory.EXTENSION_DESIGN_ENGINE_FACTORY );
            engine = factory.createDesignEngine( config );

        }catch( Exception ex){
            ex.printStackTrace();
        }       


        SessionHandle session = engine.newSessionHandle( ULocale.ENGLISH ) ;



        try{
            //open a design or a template

            designHandle = session.openDesign("D:/tempBirtReport/test.rptdesign");

            designFactory = designHandle.getElementFactory( );

            buildDataSource();
            buildDataSet(cols, fromClause);

            TableHandle table = designFactory.newTableItem( "table", cols.size() );
            table.setWidth( "100%" );
            table.setDataSet( designHandle.findDataSet( "ds" ) );


            PropertyHandle computedSet = table.getColumnBindings( ); 
            ComputedColumn  cs1 = null;

            for( int i=0; i < cols.size(); i++){
                cs1 = StructureFactory.createComputedColumn();
                cs1.setName((String)cols.get(i));
                cs1.setExpression("dataSetRow[\"" + (String)cols.get(i) + "\"]");
                computedSet.addItem(cs1);
            }


            // table header
            RowHandle tableheader = (RowHandle) table.getHeader( ).get( 0 );


            for( int i=0; i < cols.size(); i++){
                LabelHandle label1 = designFactory.newLabel( (String)cols.get(i) ); 
                label1.setText((String)cols.get(i));
                CellHandle cell = (CellHandle) tableheader.getCells( ).get( i );
                cell.getContent( ).add( label1 );
            }                           

            // table detail
            RowHandle tabledetail = (RowHandle) table.getDetail( ).get( 0 );
            for( int i=0; i < cols.size(); i++){
                CellHandle cell = (CellHandle) tabledetail.getCells( ).get( i );
                DataItemHandle data = designFactory.newDataItem( "data_"+(String)cols.get(i) );
                data.setResultSetColumn( (String)cols.get(i));
                cell.getContent( ).add( data );
            }

            designHandle.getBody( ).add( table );

            // Save the design and close it. 

            designHandle.saveAs( "D:/tempBirtReport/test.rptdesign" ); //$NON-NLS-1$
            designHandle.close( );
            System.out.println("Finished");
        }catch (Exception e){
            e.printStackTrace();
        }       

    }
 }