When to Use It in Java

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Serialized LOB isn't considered as often as it might be XML makes it much more attractive since it yields a easy-to-implement textual approach Its main disadvantage is that you can't query the structure using SQL SQL extensions appear to get at XML data within a field, but that's still not the same (or portable)
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This pattern works best when you can chop out a piece of the object model and use it to represent the LOB Think of a LOB as a way to take a bunch of objects that aren't likely to be queried from any SQL route outside the application This graph can then be hooked into the SQL schema
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Serialized LOB works poorly when you have objects outside the LOB reference objects buried in it To handle this you have to come up with some form of referencing scheme that can support references to objects inside a LOB it's by no means impossible, but it's awkward, awkward enough usually not to be worth doing Again XML, or rather XPath, reduces this awkwardness somewhat
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If you're using a separate database for reporting and all other SQL goes against that database, you can transform the LOB into a suitable table structure The fact that a reporting database is usually denormalized
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means that structures suitable for Serialized LOB are often also suitable for a separate reporting database
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Example: Serializing a Department Hierarchy in XML (Java)
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For this example we'll take the notion of customers and departments from the sketch and show how you might serialize all the departments into an XML CLOB As I write this, Java's XML handling is somewhat primitive and volatile, so the code may look different when you get to it (I'm also using an early version of JDOM)
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The object model of the sketch turns into the following class structures:
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class Customer private String name; private List departments = new ArrayList(); class Department private String name; private List subsidiaries = new ArrayList();
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The database for this has only one table
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create table customers (ID int primary key, name varchar, departments varchar)
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We'll treat the customer as an Active Record (160) and illustrate writing the data with the insert behavior
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class Customer public Long insert() { PreparedStatement insertStatement = null; try { insertStatement = DBprepare(insertStatementString); setID(findNextDatabaseId()); insertStatementsetInt(1, getID()intValue()); insertStatementsetString(2, name); insertStatementsetString(3, XmlStringerwrite(departmentsToXmlElement())); insertStatementexecute(); RegistryaddCustomer(this); return getID(); } catch (SQLException e) { throw new ApplicationException(e); } finally {DBcleanUp(insertStatement); } } public Element departmentsToXmlElement() { Element root = new Element("departmentList"); Iterator i = departmentsiterator(); while (ihasNext()) { Department dep = (Department) inext(); rootaddContent(deptoXmlElement()); } return root; } class Department Element toXmlElement() { Element root = new Element("department"); rootsetAttribute("name", name); Iterator i = subsidiariesiterator();
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while (ihasNext()) { Department dep = (Department) inext(); rootaddContent(deptoXmlElement()); } return root; }
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The customer has a method for serializing its departments field into a single XML DOM Each department has a method for serializing itself (and its subsidiaries recursively) into a DOM as well The insert method then takes the DOM of the departments, converts it into a string (via a utility class) and puts it in the database We aren't particularly concerned with the structure of the string It's human readable, but we aren't going to look at it on a regular basis
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< xml version="10" encoding="UTF-8" > <departmentList> <department name="US"> <department name="New England"> <department name="Boston" /> <department name="Vermont" /> </department> <department name="California" /> <department name="Mid-West" /> </department> <department name="Europe" /> </departmentList>
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Reading back is a fairly simple reversal of this process
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class Customer public static Customer load(ResultSet rs) throws SQLException { Long id = new Long(rsgetLong("id")); Customer result = (Customer) RegistrygetCustomer(id); if (result != null) return result; String name = rsgetString("name"); String departmentLob = rsgetString("departments"); result = new Customer(name); resultreadDepartments(XmlStringerread(departmentLob)); return result; } void readDepartments(Element source) { List result = new ArrayList(); Iterator it = sourcegetChildren("department")iterator(); while (ithasNext()) addDepartment(DepartmentreadXml((Element) itnext())); } class Department static Department readXml(Element source) { String name = sourcegetAttributeValue("name"); Department result = new Department(name); Iterator it = sourcegetChildren("department")iterator(); while (ithasNext()) resultaddSubsidiary(readXml((Element) itnext())); return result; }
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The load code is obviously a mirror image of the insert code The department knows how to create itself (and its subsidiaries) from an XML element, and the customer knows how to take an XML element and create the list of departments from it The load method uses a utility class to turn the string from the database into a utility element
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An obvious danger here is that someone may try to edit the XML by hand in the database and mess up the XML, making it unreadable by the load routine More sophisticated tools that would support adding a DTD or XML schema to a field as validation will obviously help with that