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Installing OID
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You can install OID using the Oracle Application Server 10g Release 2 (10.1.2.0.0) software. You must choose the OracleAS Infrastructure 10g option in the Select a Product to Install window when using the Oracle Universal Installer. This option lets you install a new OID on your server. In the next page of the Oracle Universal Installer the Select Installation Type page select the Identify Management and Metadata Repository option; this creates a Metadata Repository, which is a requirement for installing OID. Coverage of the installation and management of OID is beyond the scope of this book. Please refer to the Oracle Application Server Release 2 documentation on the http://technet.oracle.com web site for details. Once you ve configured OID, you re ready to enter Oracle net service names into it. You can use several methods to do so. The easiest ways are to add service names using Oracle Net Manager, if you re adding entries individually, or to import your entire tnsnames.ora file into OID using Oracle Enterprise Manager.
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Oracle and Java Database Connectivity
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Frequently, Java programs need to connect to a database to perform data manipulation tasks. JDBC is an interface that permits a Java program to connect to a database and issue DML and DDL SQL statements. JDBC allows the use of dynamic SQL statements, for situations where you may not know the number and types of columns until run time. (If you re going to write static SQL, you can use SQLJ, which lets you embed SQL statements in Java.) JDBC provides a rich library of routines that help you open and close connections to databases and process data. In the following sections, you ll see how you can use JDBC to connect to and work with Oracle databases from Java.
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CHAPTER 11 C ON NEC TIVITY A ND NETWORKING
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Establishing Database Connectivity
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Before you can connect to a database, you have to select the appropriate drivers. Oracle provides four major kinds of JDBC drivers: JDBC thin driver: This pure Java client based driver provides a direct connection to the database using the TCP/IP protocol. The driver requires a listener and uses sockets for making connections to databases. JDBC OCI driver: This driver needs a client installation of Oracle, so it is specific to Oracle. This driver is highly scalable and can use connection pooling to serve large numbers of users. JDBC server-side thin driver: Running on the server, this driver connects to remote databases and provides the same functionality as the client-based thin driver. JDBC server-side internal driver: As its name indicates, this driver resides on the server and is used by the Java Virtual Machine (JVM) to talk to the Oracle database server. Once you choose a specific type of JDBC driver, you must specify the JDBC driver in one of two ways: use the static registerDriver() method of the JDBC DriverManager class, or use the forName() method of the java.lang class. Here are the two methods of specifying the JDBC driver: DriverManager.registerDriver ("new oracle.jdbc.OracleDriver()"); and Class.forName("oracle.jdbc.driver.OracleDriver") Once you ve loaded the JDBC driver, it s time to make the connection to the database by using the static getConnection() method of the DriverManager class. This will create an instance of the JDBC connection class. Listing 11-7 shows the code for doing this. Listing 11-7. Making the Database Connection connection conn=DriverManager.getConnection( "jdbc:oracle:thin:@prod1:1521:finprod", username, passwd); /* Here's what the different parts of the connection object stand for: */ jdbc=protocol oracle=vendor thin=driver prod1=server 1521=port number finprod=Oracle database username=database username password=database password If all your information is valid, you are connected to the database from your Java application.
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Now that you ve learned how to connect to the database using JDBC, it s time to find out how you can process SQL statements in the database through the JDBC connection. You can t execute SQL directly from your Java program. First you need to create JDBC statements, and then you need to execute your SQL statements. Let s look at these two steps in detail.
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