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4: Transactions
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Transactions form the basis of any database. In this chapter, you ll take a brief look at transactions in the context of JDBC. You ll see how to commit and roll back a transaction in JDBC. You ll learn what transaction isolation levels are and which ones are supported by Oracle. You ll learn about some important principles you need to follow when writing transactions for an Oracle application. You ll also examine transaction savepoints, a feature exposed to Java programs in JDBC 3.0.
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5: Statement and PreparedStatement
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In this chapter, you ll first be introduced to the mechanics of how Oracle processes SQL statements. You ll then examine two of the fundamental statement interfaces of JDBC: Statement and PreparedStatement. You ll look at why you should almost always prefer PreparedStatement over Statement. You ll learn about how using PreparedStatement can help avoid SQL injection (a security hacking technique) attacks. You ll also learn about standard and Oracle update batching, and compare the two in terms of performance and other features.
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INTRODUCTION
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6: CallableStatement
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In this chapter, you ll explore in detail how to invoke stored SQL procedures from JDBC using the CallableStatement interface. You ll learn how to use SQL92 syntax or Oracle syntax when invoking a stored procedure using the CallableStatement interface.
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7: Result Sets Explored
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This chapter describes the advanced features of the ResultSet interface, including prefetching, scrollability, positioning, sensitivity, and updatability. You ll learn the various strengths and weaknesses of these features, and you ll examine how to paginate through the results of a query efficiently. You ll learn how you can dynamically build query statements with unknown number of bind variables using either the PreparedStatement or CallableStatement interface. The ResultSetMetaData and DatabaseMetaData interfaces are also covered.
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8: Oracle Objects: An Objective Analysis
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This chapter introduces Oracle objects and collections. You ll critically examine how these features should be used in Oracle applications in general. Note that this chapter doesn t discuss how to access objects and collections from JDBC; those topics are covered in the next three chapters. I strongly recommend you read this chapter, though, since it forms the basis of the following three chapters that discuss Oracle objects and collections.
9: Using Weakly Typed Struct Objects
In this chapter, you ll learn how to materialize Oracle objects as weakly typed objects in Java. A weakly typed object refers to a Java object that represents objects using an array of attributes.
10: Using Strongly Typed Interfaces with JPublisher
Here, you ll learn how to materialize objects as strongly typed objects in Java. A strongly typed object refers to an object belonging to a custom Java class specifically created to represent a given database object type in Java. Along the way, you ll learn how to use the JPublisher utility to generate custom classes representing Oracle objects.
11: Using Oracle Collections and References
This chapter explains how to retrieve the collections in Oracle as either a weakly typed or strongly typed array of custom class objects (generated using the JPublisher utility). You ll critically examine some of the performance extensions Oracle provides you with, and you ll also study suitable benchmarks evaluating the effectiveness of these extensions. You ll then move on to learn about references, and how to access and manipulate them using JDBC.
12: Using LOBs and BFILEs
In this chapter, you ll learn what LOBs (large objects) are and how they re stored in Oracle. You ll then examine how to retrieve and manipulate them. You ll also compare various alternatives when manipulating LOBs through the JDBC API.
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INTRODUCTION
13: Statement Caching
In this chapter, you ll learn about statement caching, its different flavors in JDBC, and how it improves the performance of JDBC programs. As a background to the statement-caching concept, you ll also examine cursors and ref cursors in detail. In addition, you ll look at two other related caches Oracle provides you with: the PL/SQL cursor cache (which is the PL/SQL equivalent of the JDBC statement cache) and session cached cursors.
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