/**
* INTERNAL: Execute the query building the objects directly from the database result-set.
*
* @exception DatabaseException - an error has occurred on the database
* @return object - the first object found or null if none.
*/
protected Object executeObjectLevelReadQueryFromResultSet() throws DatabaseException {
UnitOfWorkImpl unitOfWork = (UnitOfWorkImpl) getSession();
DatabaseAccessor accessor = (DatabaseAccessor) unitOfWork.getAccessor();
DatabasePlatform platform = accessor.getPlatform();
DatabaseCall call = (DatabaseCall) getCall().clone();
call.setQuery(this);
call.translate(this.translationRow, null, unitOfWork);
Statement statement = null;
ResultSet resultSet = null;
boolean exceptionOccured = false;
try {
accessor.incrementCallCount(unitOfWork);
statement = call.prepareStatement(accessor, this.translationRow, unitOfWork);
resultSet = accessor.executeSelect(call, statement, unitOfWork);
ResultSetMetaData metaData = resultSet.getMetaData();
Vector results = new Vector();
ObjectBuilder builder = this.descriptor.getObjectBuilder();
while (resultSet.next()) {
results.add(
builder.buildWorkingCopyCloneFromResultSet(
this,
this.joinedAttributeManager,
resultSet,
unitOfWork,
accessor,
metaData,
platform));
}
return results;
} catch (SQLException exception) {
exceptionOccured = true;
DatabaseException commException =
accessor.processExceptionForCommError(session, exception, call);
if (commException != null) throw commException;
throw DatabaseException.sqlException(exception, call, accessor, unitOfWork, false);
} finally {
try {
if (resultSet != null) {
resultSet.close();
}
if (statement != null) {
accessor.releaseStatement(statement, call.getSQLString(), call, unitOfWork);
}
} catch (SQLException exception) {
if (!exceptionOccured) {
// in the case of an external connection pool the connection may be null after the
// statement release
// if it is null we will be unable to check the connection for a comm error and
// therefore must return as if it was not a comm error.
DatabaseException commException =
accessor.processExceptionForCommError(session, exception, call);
if (commException != null) throw commException;
throw DatabaseException.sqlException(exception, call, accessor, session, false);
}
}
}
}
/** INTERNAL: Build a ADT structure from the row data. */
public Struct buildStructureFromRow(
AbstractRecord row, AbstractSession session, java.sql.Connection connection)
throws DatabaseException {
Struct structure;
boolean reconnected = false;
try {
if (connection == null) {
((DatabaseAccessor) session.getAccessor()).incrementCallCount(session);
reconnected = true;
connection = ((DatabaseAccessor) session.getAccessor()).getConnection();
}
Object[] fields = new Object[getOrderedFields().size()];
for (int index = 0; index < getOrderedFields().size(); index++) {
DatabaseField field = (DatabaseField) getOrderedFields().elementAt(index);
fields[index] = row.get(field);
}
structure =
session.getPlatform().createStruct(getStructureName(), fields, session, connection);
} catch (java.sql.SQLException exception) {
throw DatabaseException.sqlException(exception, session, false);
} finally {
if (reconnected) {
((DatabaseAccessor) session.getAccessor()).decrementCallCount();
}
}
return structure;
}
/**
* INTERNAL: Build and return the appropriate field value for the specified set of nested rows.
* The database better be expecting an ARRAY. It looks like we can ignore inheritance here....
*/
public Object buildFieldValueFromNestedRows(
Vector nestedRows, String structureName, AbstractSession session) throws DatabaseException {
Object[] fields = new Object[nestedRows.size()];
java.sql.Connection connection = ((DatabaseAccessor) session.getAccessor()).getConnection();
boolean reconnected = false;
try {
if (connection == null) {
((DatabaseAccessor) session.getAccessor()).incrementCallCount(session);
reconnected = true;
connection = ((DatabaseAccessor) session.getAccessor()).getConnection();
}
int i = 0;
for (Enumeration stream = nestedRows.elements(); stream.hasMoreElements(); ) {
AbstractRecord nestedRow = (AbstractRecord) stream.nextElement();
fields[i++] = this.buildStructureFromRow(nestedRow, session, connection);
}
return session.getPlatform().createArray(structureName, fields, session, connection);
} catch (java.sql.SQLException exception) {
throw DatabaseException.sqlException(exception, session, false);
} finally {
if (reconnected) {
((DatabaseAccessor) session.getAccessor()).decrementCallCount();
}
}
}
/**
* INTERNAL: This method notifies the accessor that a particular sets of writes has completed.
* This notification can be used for such thing as flushing the batch mechanism
*/
public void writesCompleted() {
for (Iterator sessionEnum = getSessionsByName().values().iterator(); sessionEnum.hasNext(); ) {
AbstractSession session = (AbstractSession) sessionEnum.next();
if (!session.isConnected()) {
throw DatabaseException.databaseAccessorNotConnected();
}
}
for (Iterator sessionEnum = getSessionsByName().values().iterator(); sessionEnum.hasNext(); ) {
AbstractSession session = (AbstractSession) sessionEnum.next();
session.writesCompleted();
}
}
/**
* INTERNAL: Commit the transaction on all child sessions. This assumes that the commit of the
* transaction will not fail because all of the modification has already taken place and no errors
* would have occurred.
*/
protected void basicCommitTransaction() throws DatabaseException {
// Do one last check it make sure that all sessions are still connected.
for (Iterator sessionEnum = getSessionsByName().values().iterator(); sessionEnum.hasNext(); ) {
AbstractSession session = (AbstractSession) sessionEnum.next();
if (!session.isConnected()) {
throw DatabaseException.databaseAccessorNotConnected();
}
}
for (Iterator sessionEnum = getSessionsByName().values().iterator(); sessionEnum.hasNext(); ) {
AbstractSession session = (AbstractSession) sessionEnum.next();
session.commitTransaction();
}
}
/**
* INTERNAL: Build the appropriate field value for the specified set of direct values. The
* database better be expecting an ARRAY.
*/
public Object buildFieldValueFromDirectValues(
Vector directValues, String elementDataTypeName, AbstractSession session)
throws DatabaseException {
Object[] fields = Helper.arrayFromVector(directValues);
try {
((DatabaseAccessor) session.getAccessor()).incrementCallCount(session);
java.sql.Connection connection = ((DatabaseAccessor) session.getAccessor()).getConnection();
return session.getPlatform().createArray(elementDataTypeName, fields, session, connection);
} catch (java.sql.SQLException ex) {
throw DatabaseException.sqlException(ex, session, false);
} finally {
((DatabaseAccessor) session.getAccessor()).decrementCallCount();
}
}
/**
* INTERNAL: Build a row representation from the ADT structure field array. TopLink will then
* build the object from the row.
*/
public AbstractRecord buildRowFromStructure(Struct structure) throws DatabaseException {
Object[] attributes;
try {
attributes = structure.getAttributes();
} catch (java.sql.SQLException exception) {
throw DatabaseException.sqlException(exception);
}
if (attributes != null) {
for (int i = 0; i < attributes.length; i++) {
if (attributes[i] instanceof Array) {
attributes[i] =
ObjectRelationalDataTypeDescriptor.buildArrayObjectFromArray(attributes[i]);
} else if (attributes[i] instanceof Struct) {
attributes[i] =
ObjectRelationalDataTypeDescriptor.buildArrayObjectFromStruct(attributes[i]);
}
}
}
return buildNestedRowFromFieldValue(attributes);
}
/** INTERNAL: Build array of objects for Struct data type. */
public static Object buildArrayObjectFromStruct(Object structure) throws DatabaseException {
Object[] attributes = null;
if (structure == null) {
return structure;
}
try {
attributes = ((Struct) structure).getAttributes();
} catch (java.sql.SQLException exception) {
throw DatabaseException.sqlException(exception);
}
if (attributes == null) {
return null;
} else {
for (int i = 0; i < attributes.length; i++) {
if (attributes[i] instanceof Array) {
attributes[i] = buildArrayObjectFromArray(attributes[i]);
}
if (attributes[i] instanceof Struct) {
attributes[i] = buildArrayObjectFromStruct(attributes[i]);
}
}
}
return attributes;
}
/** INTERNAL: Build array of objects for Array data type. */
public static Object buildArrayObjectFromArray(Object array) throws DatabaseException {
Object[] objects = null;
if (array == null) {
return array;
}
try {
objects = (Object[]) ((Array) array).getArray();
} catch (java.sql.SQLException ex) {
throw DatabaseException.sqlException(ex);
}
if (objects == null) {
return null;
} else {
for (int i = 0; i < objects.length; i++) {
if (objects[i] instanceof Array) {
objects[i] = buildArrayObjectFromArray(objects[i]);
}
if (objects[i] instanceof Struct) {
objects[i] = buildArrayObjectFromStruct(objects[i]);
}
}
}
return objects;
}
/**
* INTERNAL: Build and return the nested rows from the specified field value. This method allows
* the field value to be an ARRAY containing other structures such as arrays or Struct, or direct
* values.
*/
public static Object buildContainerFromArray(
Array fieldValue, ObjectRelationalDatabaseField arrayField, AbstractSession session)
throws DatabaseException {
if (arrayField.getType() == null) {
return fieldValue;
}
Object[] objects = null;
try {
objects = (Object[]) fieldValue.getArray();
} catch (java.sql.SQLException ex) {
throw DatabaseException.sqlException(ex, session, false);
}
if (objects == null) {
return null;
}
boolean isNestedStructure = false;
ObjectRelationalDataTypeDescriptor ord = null;
DatabaseField nestedType = null;
if (arrayField != null) {
nestedType = arrayField.getNestedTypeField();
if ((nestedType != null) && nestedType.getSqlType() == Types.STRUCT) {
ClassDescriptor descriptor = session.getDescriptor(nestedType.getType());
if ((descriptor != null) && (descriptor.isObjectRelationalDataTypeDescriptor())) {
// this is used to convert non-null objects passed through stored procedures and custom
// SQL to structs
ord = (ObjectRelationalDataTypeDescriptor) descriptor;
}
} else if ((nestedType != null) && (nestedType instanceof ObjectRelationalDatabaseField)) {
isNestedStructure = true;
}
}
// handle ARRAY conversions
ReadObjectQuery query = new ReadObjectQuery();
query.setSession(session);
ContainerPolicy cp = ContainerPolicy.buildPolicyFor(arrayField.getType());
Object container = cp.containerInstance(objects.length);
for (int i = 0; i < objects.length; i++) {
Object arrayValue = objects[i];
if (arrayValue == null) {
return null;
}
if (ord != null) {
AbstractRecord nestedRow = ord.buildRowFromStructure((Struct) arrayValue);
ClassDescriptor descriptor = ord;
if (descriptor.hasInheritance()) {
Class newElementClass =
descriptor.getInheritancePolicy().classFromRow(nestedRow, session);
if (!descriptor.getJavaClass().equals(newElementClass)) {
descriptor = session.getDescriptor(newElementClass);
if (descriptor == null) {
descriptor = ord;
}
}
}
arrayValue = descriptor.getObjectBuilder().buildNewInstance();
descriptor
.getObjectBuilder()
.buildAttributesIntoObject(arrayValue, nestedRow, query, null, false);
} else if (isNestedStructure && (arrayValue instanceof Array)) {
arrayValue =
buildContainerFromArray(
(Array) arrayValue, (ObjectRelationalDatabaseField) nestedType, session);
}
cp.addInto(arrayValue, container, session);
}
return container;
}