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CHAPTER 3 INTRODUCTION TO JDBC
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Oracle s core JDBC implementation lies in the following two packages: oracle.jdbc: This package implements and extends functionality provided by the java.sql and javax.sql interfaces (e.g., OraclePreparedStatement and OracleCallableStatement).. oracle.sql: This package contains classes and interfaces that provide Java mappings to SQL data types (e.g., OracleTypes). You can browse through the standard JDBC packages on the http://java.sun.com site. Currently, the exact URL is http://java.sun.com/j2se/1.4.2/docs/api/index.html (this may change in the future).
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JDBC Driver Types
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A JDBC driver is the code that implements the JDBC API. Many vendors supply implementations of JDBC drivers (obviously, we will use the ones supplied by Oracle in this book). JDBC driver implementations are categorized into following four types: Type 1 drivers implement the JDBC API as a mapping to another data access API, such as ODBC. These drivers are generally dependent on a native client library, which limits their portability. Sun s JDBC-ODBC Bridge driver is an example of a Type 1 driver. This driver has many limitations, including limited support for JDBC 3.0 and the fact that it is not multithreaded. Type 2 drivers are written partly in the Java programming language and partly in native code. These drivers require a native client library specific to the data source to which they connect and are therefore often referred to as thick drivers. Again, due to the native code, their portability is limited. Type 3 drivers use a pure Java client and communicate with a middleware server using a database-independent protocol. The middleware server then translates the client s requests to the data source using the database-dependent protocol. Type 4 drivers are implemented completely in Java (hence, they are platform independent). They communicate directly with the data source using a standard Java socket and require no extra client-side software. They are commonly referred to as thin drivers.
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Oracle JDBC Drivers
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Oracle currently provides four JDBC drivers, two client-side and two server-side: Client side: JDBC thin driver (Type 4) and JDBC OCI driver (Type 2) Server side: JDBC server-side thin driver (Type 4) and JDBC server-side internal driver (Type 2)
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CHAPTER 3 INTRODUCTION TO JDBC
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The client-side drivers are used for JDBC code running outside the database (e.g., in an application, an applet, a servlet, etc.), and the server-side drivers are for JDBC code running inside the database. The 10g Release 1 JDBC drivers can access Oracle 8.1.7 and higher version of database. While all Oracle JDBC drivers are similar, some features apply only to JDBC OCI drivers and some apply only to the JDBC thin driver. Besides implementing all the interfaces in the JDBC standard java.sql package, all four drivers implement Oracle s own extensions in the oracle.jdbc package. The following sections detail each of the Oracle driver types and help you choose an appropriate driver for your application.
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Oracle s JDBC thin driver is used for accessing a database from a Java program running on an application or an applet. This driver is written 100% in Java and hence is platform independent. It does not require any additional Oracle software on the client (i.e., the machine from which you run your JDBC program). This driver supports only TCP/IP-based communication. This means that this driver requires the server to be configured with a TCP/IP listener.
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JDBC OCI Driver
Oracle s JDBC OCI driver (also known as the thick driver) is meant for accessing a database from an application (i.e., not an applet). OCI stands for Oracle Call Interface, an API that allows you to access and manipulate data in the Oracle database server using a third-generation language (3GL) such as C/C++. The JDBC OCI driver is a wrapper around the OCI layer and is Oracle platform specific since it requires the OCI C libraries, Oracle Net libraries, CORE libraries, and other necessary files to be present on the client machine on which the JDBC program runs. Until 9i Release 2, this driver required the entire Oracle client installation to be present on the machine on which the JDBC program using this driver runs. Starting with 10g, there is an option called Instant Client that simplifies the use of this driver by significantly reducing the number of files it requires on the client machine. The OCI driver supports all installed Oracle Net adapters, including IPC, named pipes, and TCP/IP.
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