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When you work with an SQL database in a Java application, the Java code issues SQL statements to the database via the Java Database Connectivity (JDBC) API. Whether the SQL was written by hand and embedded in the Java code, or generated on the fly by Java code, you use the JDBC API to bind arguments to prepare query parameters, execute the query, scroll through the query result table, retrieve values from the result set, and so on. These are low-level data access tasks; as application developers, we re more interested in the business problem that requires this data access. What we d really like to write is code that saves and

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retrieves objects the instances of our classes to and from the database, relieving us of this low-level drudgery. Because the data access tasks are often so tedious, we have to ask: Are the relational data model and (especially) SQL the right choices for persistence in objectoriented applications We answer this question immediately: Yes! There are many reasons why SQL databases dominate the computing industry relational database management systems are the only proven data management technology, and they re almost always a requirement in any Java project. However, for the last 15 years, developers have spoken of a paradigm mismatch. This mismatch explains why so much effort is expended on persistence-related concerns in every enterprise project. The paradigms referred to are object modeling and relational modeling, or perhaps object-oriented programming and SQL. Let s begin our exploration of the mismatch problem by asking what persistence means in the context of object-oriented application development. First we ll widen the simplistic definition of persistence stated at the beginning of this section to a broader, more mature understanding of what is involved in maintaining and using persistent data.

NumberOfIndividualSurveys -------------------------18484

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In an object-oriented application, persistence allows an object to outlive the process that created it. The state of the object can be stored to disk, and an object with the same state can be re-created at some point in the future. This isn t limited to single objects entire networks of interconnected objects can be made persistent and later re-created in a new process. Most objects aren t persistent; a transient object has a limited lifetime that is bounded by the life of the process that instantiated it. Almost all Java applications contain a mix of persistent and transient objects; hence, we need a subsystem that manages our persistent data. Modern relational databases provide a structured representation of persistent data, enabling the manipulating, sorting, searching, and aggregating of data. Database management systems are responsible for managing concurrency and data integrity; they re responsible for sharing data between multiple users and multiple applications. They guarantee the integrity of the data through integrity rules that have been implemented with constraints. A database management system provides data-level security. When we discuss persistence in this book, we re thinking of all these things:

Note that the second argument of the value method indicates which SQL data type the value retrieved from the XML document should be converted to in the result.

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Storage, organization, and retrieval of structured data Concurrency and data integrity Data sharing

The nodes method is used to shred the XML into a tabular form. In the following example, each Order element found is returned as a separate row in the query result. In addition to using the nodes method, the code also uses the value method to retrieve specific values from the XML document into the resulting columns. Note that this method can be used with an INSERT. . .SELECT or an UPDATE statement to pass multiple values to SQL Server in a single parameter:

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And, in particular, we re thinking of these problems in the context of an objectoriented application that uses a domain model An application with a domain model doesn t work directly with the tabular representation of the business entities; the application has its own object-oriented model of the business entities If the database of an online auction system has ITEM and BID tables, for example, the Java application defines Item and Bid classes Then, instead of directly working with the rows and columns of an SQL result set, the business logic interacts with this object-oriented domain model and its runtime realization as a network of interconnected objects Each instance of a Bid has a reference to an auction Item, and each Item may have a collection of references to Bid instances.

DECLARE @Orders XML; SET @Orders = N' <Orders> <Order Product="Bike" Quantity="1"/> <Order Product="Bike" Quantity="2"/> <Order Product="Car" Quantity="4"/> </Orders>';

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