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以下這個(gè)例子來自birt 的官方教材,我沒有改動(dòng)任何的信息.
這個(gè)例子演示了從建立DataSource ,然后建立DataSet , 動(dòng)態(tài)的根據(jù)輸入數(shù)據(jù)輸出report template .
關(guān)于Birt 的 API , 在 eclipse 的 help content 里面有,3.3 支持新的基于topic 的search ,可以幫我們簡(jiǎn)化搜索的topic , 其中有五個(gè)API (一共是5個(gè)) : Report Object Model API , Report Engine API , Birt Report Scripting API , Open Data Access API , Data Engine API .另外也提供詳細(xì)的講解每一個(gè)report 的元素的意思.非常好的一份資料 .
DECreateDynamicTable.java 例子code :
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("OFFICECODE");
al.add("CITY");
al.add("COUNTRY");
de.buildReport(al, "From Offices" );
}
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",
"org.eclipse.birt.report.data.oda.sampledb.Driver" );
dsHandle.setProperty( "odaURL", "jdbc:classicmodels:sampledb" );
dsHandle.setProperty( "odaUser", "ClassicModels" );
dsHandle.setProperty( "odaPassword", "" );
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", "C:/birt-runtime-2_1_1/birt-runtime-2_1_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("c:/tmp/testdeapi.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( "c:/temp/sample.rptdesign" ); //$NON-NLS-1$
designHandle.close( );
System.out.println("Finished");
}catch (Exception e){
e.printStackTrace();
}
}
}
這個(gè)例子一共有四個(gè)函數(shù) :
1 . Main 函數(shù): 這個(gè)例子簡(jiǎn)單之處在與它可以直接的運(yùn)行,只要你修改了
config.setProperty("BIRT_HOME", "C:/birt-runtime-2_1_1/birt-runtime-2_1_1/ReportEngine"); 指向你自己的Birt Runtime 解壓后的ReportEngine 目錄.
designHandle = session.openDesign("c:/tmp/testdeapi.rptdesign"); 你可以從Birt 里面建立一個(gè)新的Report template.然后指向這個(gè)report 就可以了
designHandle.saveAs( "c:/temp/sample.rptdesign" ); //$NON-NLS-1$ 指定一個(gè)你想保存的位置,c:/temp 目錄存在你才能夠保存到c:/temp 目錄下.
2 . buildDataSource 函數(shù)把一個(gè)ReportDesignHandle 的 Data Source 初始化, setProperties 左邊的String 是不能變的,Data Source 的名字可以隨便取,取DataSet 的時(shí)候要根據(jù)這個(gè)名字來取.
3 . buildDataSet 通過拼sql 的方式 ,來build DataSet, 注意sql 別拼錯(cuò)了.
4 . buildReport 注意element 的初始化順序.在所有的DataItem 外面都是一層Cell,Cell 外面才是row .這個(gè)例子使用的row 來拼成table 的,也可以用column 來拼,相對(duì)應(yīng)的數(shù)據(jù)處理也是一個(gè)column 一個(gè) column 的處理的了. |
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