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CHAPTER
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Using Oracle PL/SQL Packages
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racle supplies a large number of PL/SQL packages that help both developers and DBAs extend database functionality. This chapter focuses on the packages that DBAs can use to manage the database. Oracle implements most of its special features with these PL/SQL packages, and the number of Oracle-supplied PL/SQL packages is growing with each version of the software. Several packages are available for you to use to manage routine database tasks, and you need other packages only occasionally to perform special tasks. Some specialized packages, such as UTL_FILE and UTL_SMTP , enable you to perform some tasks easily, such as reading operating system files or sending pages without having to write lengthy pieces of code. You ll begin with an overview of the Oracle-supplied packages. You ll then review the key PL/SQL packages in detail, including examples of their use. Don t be intimidated by the many procedures and functions that are part of most of these packages. In most cases, you ll probably need to use just a couple of the key procedures to perform a task.
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Overview of the Oracle-Supplied PL/SQL Packages
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Oracle-supplied packages have the same kind of functionality as the packages that you can create in the database. They have the same specification and body structure, and can include several functions and procedures. The biggest advantages to using packages are the reusability of code, the ability to overload procedures and functions, and an efficient organization of stored program code. Oracle PL/SQL packages exploit all the standard benefits of the regular user-created packages.
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Who Creates the Oracle Packages
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The Oracle PL/SQL packages are automatically created in a new database when you run the script catproc.sql (from the $ORACLE_HOME/rdbms/admin directory) right after the creation of the database. You do need to create some special packages manually, but most of the packages are automatically created when you run the catproc.sql script (see 9). The user SYS owns all these packages, and a user with the DBA role has the privileges to execute any of them. If you sometimes can t execute a PL/SQL package, just add the SYS schema name before the package name (for example, SYS.DBMS_SYSTEM). If other database users need to use these packages, the DBA must grant the necessary SELECT or EXECUTE privileges on the individual packages.
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How Do You Use the Oracle Packages
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Almost all the Oracle-supplied PL/SQL packages consist of a set of procedures (and sometimes functions) that together provide the functionality for which the package is designed. At any given time, you re usually executing a procedure or a function that belongs to the PL/SQL package.
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CHAPTER 24 USING ORACLE PL/SQL PACKAGES
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For example, the well-known PL/SQL package DBMS_OUTPUT has the procedure PUT_LINE, which you use to see the output of PL/SQL code on your screen. In the following discussion of important Oracle packages, first you ll learn the key procedures that make up each package. Later on, you ll see how to use the package to perform relevant tasks. An easy way to list all the procedures and functions within an Oracle package is to simply use the familiar DESCRIBE command in SQL*Plus. For each package, the DESCRIBE command shows the following columns: PROCEDURE/FUNCTION_NAME: This column indicates whether the component is a procedure or a function, and provides you with the component s name. ARGUMENT_NAME: This column provides you with the name of each argument in a procedure or function. TYPE: This column contains the argument type (Boolean, date, and so forth). IN/OUT: This column indicates whether the argument is an IN or OUT parameter. DEFAULT : This column indicates whether there s a default value for the column. If the DEFAULT column is empty, that means that there s no default value for the column. If there is a default value, you ll see the word DEFAULT instead. In the following sections, you ll see all the important Oracle-supplied PL/SQL packages that are part of Oracle Database 10g. You can roughly divide the packages into two types: a set of general database management utilities and a set of specialized packages for implementing certain features of the Oracle database. The first part of the discussion deals with the general PL/SQL packages, and the second section reviews the features of the specialized packages. These specialized packages are used extensively in various chapters in this book, as noted in the relevant sections. Some important Database Management System (DBMS) packages such as DBMS_SQL aren t covered here, because this chapter s focus is on the most useful packages for DBAs, not for developers. To save space, I may not list all the procedures and functions in every package when I describe it. You can either describe the package in SQL*Plus to view all its components, or you can look it up in the Oracle manual titled PL/SQL Packages and Types Reference.
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