Hi,
some time ago I had the problem of linking several XML files (datasets) with UNION ALL. Here is my solution. Maybe it's useful for one or the other.
Maybe you have suggestions for improvement.
1. Prepare XML Datasources
2. Add Datasets for XML Datsources and create an UnionAll Dataset
with Code
Example:
Datasources:
- Datasource XML 1
- Datasource XML 2
- Datasource XML 3
Datasets:
- Dataset XML 1
- Dataset XML 2
- Dataset XML 3
- Dataset UnionAll
Dataset UnionAll Code:
Method open:
// DO NOT EDIT
importPackage(Packages.org.eclipse.birt.report.model.api);
importPackage(Packages.java.lang);
importPackage(Packages.java.util);
importPackage(Packages.org.eclipse.birt.report.data.adapter.api);
importPackage(Packages.org.eclipse.birt.report.model.api);
importPackage(Packages.org.eclipse.birt.data.engine.api.querydefn);
// Context Init
myconfig = reportContext.getReportRunnable().getReportEngine().getConfig();
des = DataRequestSession.newSession(myconfig, new DataSessionContext(3));
// ResultIterators
ri = new Array(datasetList.length);
for (i=0; i<datasetList.length; i++) {
qd = new QueryDefinition();
qd.setDataSetName(datasetList[i][0]);
qd.setAutoBinding(true);
qd.setColumnProjection(columnList);
dsrc = reportContext.getDesignHandle().findDataSource(datasetList[i][1]);
dset = reportContext.getDesignHandle().findDataSet(datasetList[i][0]);
des.defineDataSource(des.getModelAdaptor().adaptDataSource(dsrc));
des.defineDataSet(des.getModelAdaptor().adaptDataSet(dset));
pq = des.prepare(qd);
qr = pq.execute(null);
ri[i] = qr.getResultIterator();
}
rimax = ri.length;
ricnt = 0;
rownum = 0;
Method fetch:
// DO NOT EDIT
if ( ri[ricnt].next() ) {
for (i=0; i<columnList.length; i++) {
row[columnList[i]] = ri[ricnt].getString(columnList[i]);
}
return true;
} else {
ricnt++;
while ( ricnt < rimax ) {
if ( ri[ricnt].next() ) {
for (i=0; i<columnList.length; i++) {
row[columnList[i]] = ri[ricnt].getString(columnList[i]);
}
return true;
} else {
ricnr++;
}
}
}
Method close:
// DO NOT EDIT
for (i=0; i<ri.length; i++) {
ri[i].close();
}
pq.close();
des.closeAll(false);
Method beforeOpen:
//-------------- USER SETTINGS -------------------------------
datasetList = [
["Dataset XML 1", "Datasource XML 1"],
["Dataset XML 2", "Datasource XML 2"],
["Dataset XML 3", "Datasource XML 3"],
];
columnList = ["column1", "column2", "column3", "column4"];
//-------------- USER SETTINGS -------------------------------
] 
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