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Oracle PL/SQL Programming: A Developer's Workbook
book

Oracle PL/SQL Programming: A Developer's Workbook

by Steven Feuerstein, Andrew Odewahn
May 2000
Intermediate to advanced content levelIntermediate to advanced
594 pages
11h 32m
English
O'Reilly Media, Inc.
Content preview from Oracle PL/SQL Programming: A Developer's Workbook

Intermediate

Q:

26-12.

These steps for accessing a Java class from PL/SQL are now in order:

Use javac (or an IDE such as JDeveloper) to compile the Java code.
Use loadjava to load the class into the database.
Write PL/SQL wrappers to publish the class’ methods.
Grant the necessary privileges on the PL/SQL wrappers.
Call the PL/SQL wrapper programs.

Q:

26-13.

The operating system commands that compile and load the helloWorld class are:

javac helloWorld.java
loadjava "u scott/tiger "force helloWorld.class

Q:

26-14.

The Oracle8i DDL command that loads the helloWorld class directly into the database is:

CREATE OR REPLACE JAVA SOURCE NAMED "helloWorld" AS
   public class helloWorld {
      public static void doit () {
          System.out.println("Hello World!!!");
      }
   };

Q:

26-15.

(b). You include the LANGUAGE JAVA clause in a function or procedure header to create a call spec for a Java method.

Q:

26-16.

Executing DBMS_JAVA.SET_OUTPUT (buffer size) is the equivalent of the command SET SERVEROUTPUT ON. You will not see any output from the Java’s System.out or System.err until you execute this command.

Q:

26-17.

(c). You should use a procedure to publish a void Java method.

Q:

26-18.

Here is the completed table (remember that there are many Java equivalents for each PL/SQL datatype).

PL/SQL Datatype

Java Equivalent

VARCHAR2

java.lang.String

DATE

oracle.sql.DATE

NUMBER (integer)

int

NUMBER (real)

double

ROWID

java.lang.String

OBJECT

oracle.sql.STRUCT

RAW

byte[ ]

Q:

26-19.

The call spec for the OutputTest class is:

CREATE OR REPLACE PROCEDURE output_test ...
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Publisher Resources

ISBN: 9781449324070Supplemental ContentErrata Page