Contents

Title and Copyright Information

Preface

• Documentation Accessibility
• Conventions

1 Introduction and Roadmap

• Document Scope and Audience
• Guide to this Document
• Related Documentation
• JDBC Samples and Tutorials
  • Avitek Medical Records Application (MedRec)
  • JDBC Examples in the WebLogic Server Distribution
• New and Changed Features in This Release
  • getVendorConnectionSafe
  • Change in Unwrap Implementation

2 Using WebLogic JDBC in an Application

• Getting a Database Connection from a DataSource Object
  • Importing Packages to Access DataSource Objects
  • Obtaining a Client Connection Using a DataSource
  • Possible Exceptions When a Connection Request Fails
• Pooled Connection Limitation
• Getting a Connection from an Application-Scoped Data Source

3 Performance Tuning Your JDBC Application

• WebLogic Performance-Enhancing Features
  • How Pooled Connections Enhance Performance
  • Caching Statements and Data
• Designing Your Application for Best Performance
  • Process as Much Data as Possible Inside the Database
  • Use Built-in DBMS Set-based Processing
  • Make Your Queries Smart
  • Make Transactions Single-batch
  • Never Have a DBMS Transaction Span User Input
  • Use In-place Updates
  • Keep Operational Data Sets Small
  • Use Pipelining and Parallelism

4 Using WebLogic Wrapper Drivers

• Using the WebLogic RMI Driver (Deprecated)
  • Setting Up WebLogic Server to Use the WebLogic RMI Driver
  • Sample Client Code for Using the RMI Driver
    • Import the Required Packages
    • Get the Database Connection
    • Using a JNDI Lookup to Obtain the Connection
    • Using Only the WebLogic RMI Driver to Obtain a Database Connection
  • Row Caching with the WebLogic RMI Driver
    • Important Limitations for Row Caching with the WebLogic RMI Driver
  • Limitations When Using Global Transactions
• Using the WebLogic JTS Driver (Deprecated)
  • Sample Client Code for Using the JTS Driver
• Using the WebLogic Pool Driver (Deprecated)

5 Using API Extensions in JDBC Drivers

• Using API Extensions to JDBC Interfaces
  • Getting a Physical Connection from a Data Source
    • Opening a Connection
    • Closing a Connection
    • Limitations for Using a Physical Connection
  • Sample Code for Accessing API Extensions to JDBC Interfaces
    • Import Packages to Access API Extensions
    • Get a Connection
    • Cast the Connection as a Vendor Connection
    • Use API Extensions
• Using API Extensions with the Oracle Thin Driver
  • Special Considerations When Using Oracle Thin Driver Extensions
  • Sample Code for Accessing Oracle Thin Driver Extensions to JDBC Interfaces
  • Programming with ARRAYs
    • Import Packages to Access Oracle Extensions
    • Establish the Connection
    • Getting an ARRAY
    • Updating ARRAYs in the Database
    • Using Oracle Array Extension Methods
  • Programming with STRUCTs
    • Getting a STRUCT
    • Using OracleStruct Extension Methods
    • Getting STRUCT Attributes
    • Using STRUCTs to Update Objects in the Database
    • Creating Objects in the Database
    • Automatic Buffering for STRUCT Attributes
  • Programming with REFs
    • Getting a REF
    • Using OracleRef Extension Methods
    • Getting a Value
    • Updating REF Values
    • Creating a REF in the Database
  • Programming with BLOBs and CLOBs
    • Query to Select BLOB Locator from the DBMS
    • Declare the WebLogic Server java.sql Objects
    • Begin SQL Exception Block
    • Updating a CLOB Value Using a Prepared Statement
• Programming with Oracle Virtual Private Databases
  • Oracle VPD with WebLogic Server
• Using Batching with the Oracle Thin Driver
• Support for API Extensions Between Versions of WebLogic Server Clients and Servers
• Tables of Oracle Thin Driver Extension Interfaces and Supported Methods

6 Using RowSets with WebLogic Server

• About RowSets
• Types of RowSets
• Programming with RowSets
• CachedRowSets
  • Characteristics
  • Special Programming Considerations and Limitations for CachedRowSets
    • Entire RowSet Query Results Stored in Memory
    • Data Contention
  • Code Example
  • Importing Classes and Interfaces for a CachedRowSet
  • Creating a CachedRowSet
  • Setting CachedRowSet Properties
  • Database Connection Options
  • Populating a CachedRowSet
  • Setting CachedRowSet MetaData
  • Working with Data in a CachedRowSet
    • Getting Data from a Row in a RowSet
    • Updating a Row in a RowSet
    • Inserting a Row in a RowSet
    • Deleting a Row in a RowSet
  • Synchronizing RowSet Changes with the Database
• RowSet MetaData Settings for Database Updates
• WebLogic RowSet Extensions for Working with MetaData
  • executeAndGuessTableName and executeAndGuessTableNameAndPrimaryKeys
  • Setting Table and Primary Key Information Using the MetaData Interface
  • Setting the Write Table
• RowSets and Transactions
  • Integrating with JTA Global Transactions
    • Behavior of Rowsets Using Global Transactions
  • Using Local Transactions
    • Behavior of Rowsets Using Local Transactions
  • Reusing a WebLogic RowSet After Completing a Transaction
• FilteredRowSets
  • FilteredRowSet Characteristics
  • Special Programming Considerations
    • RowSet Filters are Not Cumulative
    • No Pending Changes Before Setting or Changing a Filter
  • FilteredRowSet Code Example
  • Importing Classes and Interfaces for FilteredRowSets
  • Creating a FilteredRowSet
  • Setting FilteredRowSet Properties
  • Database Connection Options for a FilteredRowSet
  • Populating a FilteredRowSet
  • Setting FilteredRowSet MetaData
  • Setting the Filter for a FilteredRowSet
    • User-Defined RowSet Filter
    • WebLogic SQL-Style Filter
  • Working with Data in a FilteredRowSet
• WebRowSets
  • Special Programming Considerations
• JoinRowSets
• JDBCRowSets
• Handling SyncProviderExceptions with a SyncResolver
  • RowSet Data Synchronization Conflict Types
  • SyncResolver Code Example
  • Getting a SyncResolver Object
  • Navigating in a SyncResolver Object
  • Setting the Resolved Value for a RowSet Data Synchronization Conflict
  • Synchronizing Changes
• WLCachedRowSets
• SharedRowSets
• SortedRowSets
• SQLPredicate, a SQL-Style RowSet Filter
  • What is SQLPredicate?
  • SQLPredicate Grammar
  • Code Example
• Optimistic Concurrency Policies
  • VERIFY_READ_COLUMNS
  • VERIFY_MODIFIED_COLUMNS
  • VERIFY_SELECTED_COLUMNS
  • VERIFY_NONE
  • VERIFY_AUTO_VERSION_COLUMNS
  • VERIFY_VERSION_COLUMNS
  • Optimistic Concurrency Control Limitations
  • Choosing an Optimistic Policy
• Performance Options
  • JDBC Batching
    • Batching Limitations with and Oracle Database
  • Group Deletes

7 Troubleshooting JDBC

• Problems with Oracle Database on UNIX
• Thread-related Problems on UNIX
• Closing JDBC Objects
  • Abandoning JDBC Objects
• Using Microsoft SQL Server with Nested Triggers
  • Exceeding the Nesting Level
  • Using Triggers and EJBs