// Compares results of updating multiple objects yusing traditionalTopLink update one-by-one
// approach
// with updating using UpdateAllQuery. If results differ retuns a non-null error message.
// To use this method:
// 1. Populate db with the objects on which update should be performed;
// 2. In case handleChildren == true the similar query will also be tested with all subclasses:
// example: for uq.referenceClass()==Project, the test will also run for SmallProject and
// LargeProject.
// 3. After the test is completed it leaves the db in the original state (uses rollbacks).
public static String execute(Session mainSession, UpdateAllQuery uq, boolean handleChildren) {
// Find the inheritance root class - the test will compare all instances of this class
// after traditional TopLink update (one-by-one) with all instances of this class
// after UpdateAllQuery. The test succeeds if the two collections are equal.
Class rootClass = uq.getReferenceClass();
ClassDescriptor descriptor = mainSession.getClassDescriptor(uq.getReferenceClass());
if (descriptor.hasInheritance()) {
ClassDescriptor parentDescriptor = descriptor;
while (!parentDescriptor.getInheritancePolicy().isRootParentDescriptor()) {
parentDescriptor =
(ClassDescriptor) parentDescriptor.getInheritancePolicy().getParentDescriptor();
}
rootClass = parentDescriptor.getJavaClass();
}
String errorMsg = execute(mainSession, uq, handleChildren, rootClass);
if (errorMsg.length() == 0) {
return null;
} else {
return errorMsg;
}
}
protected static void clearCache(Session mainSession) {
mainSession.getIdentityMapAccessor().initializeAllIdentityMaps();
}
protected static String execute(
Session mainSession, UpdateAllQuery uq, boolean handleChildren, Class rootClass) {
String errorMsg = "";
ClassDescriptor descriptor = mainSession.getDescriptor(uq.getReferenceClass());
clearCache(mainSession);
// original objects
Vector objects = mainSession.readAllObjects(rootClass);
// first update using the original TopLink approach - one by one.
// That will be done using report query - it will use the same selection criteria
// as UpdateAllQuery and each attribute will correspond to an update item.
ReportQuery rq = new ReportQuery(uq.getReferenceClass(), uq.getExpressionBuilder());
rq.setSelectionCriteria(uq.getSelectionCriteria());
rq.setShouldRetrievePrimaryKeys(true);
// some db platforms don't allow nulls in select clause - so add the fields with null values to
// the query result.
Vector fieldsWithNullValues = new Vector();
Iterator itEntrySets = uq.getUpdateClauses().entrySet().iterator();
while (itEntrySets.hasNext()) {
Map.Entry entry = (Map.Entry) itEntrySets.next();
Expression valueExpression;
String keyString =
getQualifiedFieldNameFromKey(
entry.getKey(), rq.getReferenceClass(), descriptor, mainSession);
Object value = entry.getValue();
DatabaseMapping mapping =
descriptor.getObjectBuilder().getMappingForField(new DatabaseField(keyString));
if (mapping != null && mapping.isOneToOneMapping() && value != null) {
// Note that this only works in case the reference PK is not compound
if (((OneToOneMapping) mapping).getSourceToTargetKeyFields().size() > 1) {
errorMsg =
"Attribute "
+ mapping.getAttributeName()
+ " mapped with 1to1 mapping that has more than one targetKeyField. UpdateAllQueryTestHelper currently doesn't support that.";
}
DatabaseField targetField =
(DatabaseField)
((OneToOneMapping) mapping)
.getSourceToTargetKeyFields()
.get(new DatabaseField(keyString));
if (value instanceof Expression) {
valueExpression = ((Expression) (((Expression) value).clone())).getField(targetField);
} else {
ClassDescriptor targetDescriptor = ((OneToOneMapping) mapping).getReferenceDescriptor();
Object fieldValue =
targetDescriptor
.getObjectBuilder()
.extractValueFromObjectForField(
value,
targetField,
(oracle.toplink.essentials.internal.sessions.AbstractSession) mainSession);
valueExpression = rq.getExpressionBuilder().value(fieldValue);
}
} else {
if (value instanceof Expression) {
valueExpression = (Expression) value;
} else {
valueExpression = rq.getExpressionBuilder().value(value);
}
}
if (value == null) {
fieldsWithNullValues.add(keyString);
} else {
rq.addAttribute(keyString, valueExpression);
}
}
UnitOfWork uow = mainSession.acquireUnitOfWork();
// mainSession could be a ServerSession
Session session = uow.getParent();
// report query results contain the values to be assigned for each object to be updated.
Vector result = (Vector) session.executeQuery(rq);
Vector objectsAfterOneByOneUpdate = new Vector(objects.size());
((oracle.toplink.essentials.internal.sessions.AbstractSession) session).beginTransaction();
try {
for (int i = 0; i < result.size(); i++) {
// read through uow the object(clone) to be updated
ReportQueryResult reportResult = (ReportQueryResult) result.elementAt(i);
// hammer into the object the updated values
Object obj = reportResult.readObject(rq.getReferenceClass(), uow);
DatabaseRecord row = new DatabaseRecord();
for (int j = 0; j < reportResult.getNames().size(); j++) {
String name = (String) reportResult.getNames().elementAt(j);
DatabaseField field = new DatabaseField(name);
Object value = reportResult.getResults().elementAt(j);
row.add(field, value);
}
// some db platforms don't allow nulls in select clause - so add the fields with null values
// to the query result
for (int j = 0; j < fieldsWithNullValues.size(); j++) {
String name = (String) fieldsWithNullValues.elementAt(j);
DatabaseField field = new DatabaseField(name);
row.add(field, null);
}
rq.getDescriptor().getObjectBuilder().assignReturnRow(obj, (AbstractSession) uow, row);
}
// uow committed - objects updated.
uow.commit();
// Because the transaction will be rolled back (to return to the original state to execute
// UpdateAllQuery)
// objects are copied into another vector - later it will be compared with UpdateAllQuery
// result.
for (int i = 0; i < objects.size(); i++) {
Object original = objects.elementAt(i);
Object copy = buildCopy(descriptor, original, uow);
objectsAfterOneByOneUpdate.add(copy);
}
} finally {
// transaction rolled back - objects back to the original state in the db.
((oracle.toplink.essentials.internal.sessions.AbstractSession) session).rollbackTransaction();
}
clearCache(mainSession);
// now use UpdateAllQuery
uow = mainSession.acquireUnitOfWork();
// mainSession could be a ServerSession
session = uow.getParent();
Vector objectsAfterUpdateAll = new Vector(objects.size());
((oracle.toplink.essentials.internal.sessions.AbstractSession) session).beginTransaction();
try {
uow.executeQuery(uq);
// uow committed - objects updated.
uow.commit();
// Because the transaction will be rolled back (to return to the original state)
// objects are copied into another vector - it will be compared with update one-by-one result.
for (int i = 0; i < objects.size(); i++) {
Object original = objects.elementAt(i);
Object copy = buildCopy(descriptor, original, uow);
objectsAfterUpdateAll.add(copy);
}
} finally {
// transaction rolled back - objects back to the original state in the db.
((oracle.toplink.essentials.internal.sessions.AbstractSession) session).rollbackTransaction();
}
clearCache(mainSession);
// verify
String classErrorMsg = "";
for (int i = 0; i < objects.size(); i++) {
Object obj = objects.elementAt(i);
Object obj1 = objectsAfterOneByOneUpdate.elementAt(i);
Object obj2 = objectsAfterUpdateAll.elementAt(i);
boolean equal =
rq.getDescriptor()
.getObjectBuilder()
.compareObjects(
obj, obj2, (oracle.toplink.essentials.internal.sessions.AbstractSession) session);
if (!equal) {
classErrorMsg =
classErrorMsg
+ "Difference: original = "
+ obj.toString()
+ "; afterOneByOneUpdate = "
+ obj1.toString()
+ "; afterUpdateAll = "
+ obj2.toString()
+ ";";
}
}
if (classErrorMsg.length() > 0) {
errorMsg = errorMsg + classErrorMsg;
}
if (handleChildren) {
if (descriptor.hasInheritance() && descriptor.getInheritancePolicy().hasChildren()) {
Iterator it = descriptor.getInheritancePolicy().getChildDescriptors().iterator();
while (it.hasNext()) {
ClassDescriptor childDescriptor = (ClassDescriptor) it.next();
Class childReferenceClass = childDescriptor.getJavaClass();
UpdateAllQuery childUq = (UpdateAllQuery) uq.clone();
childUq.setReferenceClass(childReferenceClass);
childUq.setIsPrepared(false);
errorMsg += execute(mainSession, childUq, handleChildren, rootClass);
}
}
}
return errorMsg;
}