Oracle SQL Developer

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Managing Packagescalling procedures. Changes to a package spec require Oracle to recompile everystored subprogram that references the package.8.3.1 Calling Subprograms in PackagesPackages are stored in the database, where they can be shared by many applications.Calling a packaged subprogram for the first time loads the whole package and cachesit in memory, saving on disk I/O for subsequent calls. Thus, packages enhance reuseand improve performance in a multiuser, multi-application environment.If a subprogram does not take any parameters, you can include an empty set ofparentheses or omit the parentheses, both in PL/SQL and in functions called from SQLqueries. For calls to a method that takes no parameters, an empty set of parentheses isoptional within PL/SQL scopes but required within SQL scopes.8.3.2 Accessing Variables in PackagesYou can create a package specification that is designated only to supply commonvariables to other packages or subprograms. With the variables in one package, theycan be easily maintained for all subprograms that use the variables, rather thanmaintaining the variables in all the individual subprograms. These common variablesare typically used in multiple subprograms, such as a sales tax rate.In Example 8–1, the variables my_pi and my_e can be used by any subprogram. If youchange the value of my_pi or my_e, then all subprograms that use the variable get thenew value without having to change anything in those individual subprograms.Note that you need to use of the package name as a prefix to the variable name, suchas my_pkg.my_pi.Example 8–1Using Variables in PackagesCREATE PACKAGE my_pkg ASmy_pi NUMBER := 3.14016408289008292431940027343666863227;my_e NUMBER := 2.71828182845904523536028747135266249775;my_sales_tax NUMBER := 0.0825END my_pkg;/CREATE PROCEDURE circle_area(radius NUMBER) ISmy_area NUMBER;my_datatype VARCHAR2(30);BEGINmy_area := my_pkg.my_pi * radius;DBMS_OUTPUT.PUT_LINE('Radius: ' || TO_CHAR(radius)|| ' Area: ' || TO_CHAR(my_area) );END;/-- call the circle_area procedure with radius equal to 3CALL circle_area(3);-- call the circle_area procedure with radius equal to 4BEGINcircle_area(3);END;/-- cleanup: drop package and procedureDROP PROCEDURE circle_area;DROP PACKAGE my_pkg;8-4 SQL Developer Online Help
Oracle Product-Specific Packages8.4 Oracle Product-Specific PackagesOracle and various Oracle tools are supplied with product-specific packages thatdefine application programming interfaces (APIs) you can call from PL/SQL, SQL,Java, or other programming environments. This topic includes a summary of twowidely used packages and a list of the most common packages with a briefdescription.See Also:■PL/SQL Packages and Types Reference for information on and usageof product-specific packages.About the DBMS_OUTPUT PackagePackage DBMS_OUTPUT enables you to display output from PL/SQL blocks,subprograms, packages, and triggers. The package is especially useful for displayingPL/SQL debugging information. The procedure PUT_LINE outputs information to abuffer that can be read by another trigger, procedure, or package. You display theinformation by calling the procedure GET_LINE or by setting SERVEROUTPUT ON inSQL*Plus. See Inputting and Outputting Data with PL/SQL.Example 8–2 shows how to display output from a PL/SQL block.Example 8–2Using PUT_LINE in the DBMS_OUTPUT Package-- set server output to ON to display output from DBMS_OUTPUTSET SERVEROUTPUT ONBEGINDBMS_OUTPUT.PUT_LINE('These are the tables that ' || USER || ' owns:');FOR item IN (SELECT table_name FROM user_tables)LOOPDBMS_OUTPUT.PUT_LINE(item.table_name);END LOOP;END;/About the UTL_FILE PackagePackage UTL_FILE lets PL/SQL programs read and write operating system (OS) textfiles. It provides a restricted version of standard OS stream file I/O, including open,put, get, and close operations.When you want to read or write a text file, you call the function FOPEN, which returnsa file handle for use in subsequent procedure calls. For example, the procedure PUT_LINE writes a text string and line terminator to an open file, and the procedure GET_LINE reads a line of text from an open file into an output buffer.Common Oracle Supplied PackagesTable 8–1 provides a list of the common PL/SQL packages included with OracleDatabase.Table 8–1Package NameDBMS_ALERTSummary of Oracle Supplied PL/SQL PackagesDBMS_APPLICATION_INFODescriptionProvides support for the asynchronous notification ofdatabase events.Lets you register an application name with the databasefor auditing or performance tracking purposes.Subprograms and Packages: Usage Information 8-5
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Oracle SQL DeveloperOnline HelpRele
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Contents1 SQL Developer Concepts an
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3.12 Create/Edit Index ............
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6.3.2 Updating Data With the UPDATE
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10.2.5 SQL*Plus SET Commands.......
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SQL Developer User InterfaceThe men
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SQL Developer User InterfaceThe Com
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Database Objects1.2 Database Object
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Database Objectscontaining the mast
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Database Objects■■■■■■
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Database ConnectionsWhen you start
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Running and Debugging Functions and
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Using the SQL WorksheetRelated Topi
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Using the SQL WorksheetScript Runne
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Using the SQL Worksheetmentioned in
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Reports1.9 ReportsRelated TopicsRun
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Reports1.9.3 Table reportsTable rep
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Reportsissues and vulnerabilities,
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SQL Developer Preferencesand the SQ
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SQL Developer Preferences1.10.3 Cod
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SQL Developer PreferencesSQL Develo
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SQL Developer User Information: Loc
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Supplementary Oracle Database Infor
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Creating a Table (Books)the table t
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Creating a Table (Transactions)Colu
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Creating a SequenceName: for_key_bo
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Creating a PL/SQL Procedure2.6 Crea
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Using the SQL Worksheet for Queries
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Script for Creating and Using the L
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Script for Creating and Using the L
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Check for UpdatesTo remove the effe
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Select Library3.8 Select LibraryThi
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Create PL/SQL Function, Procedure,
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Create Table (quick creation)Relate
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Create/Edit Table (with advanced op
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Create Type (User-Defined)For more
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Create/Edit ViewTest Syntax: Checks
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Configure File Type AssociationsDia
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Find/Replace TextTo add a type of o
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Save/Save As3.37 Save/Save As3.38 S
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SQL*Plus Location3-28 SQL Developer
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Managing TablesTo include lowercase
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Managing Tables4.2.4 Column Constra
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Managing Indexes4.3 Managing Indexe
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Managing Indexesuseful when all of
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Managing Views4.4 Managing Views4.3
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Managing Synonyms4-12 SQL Developer
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Storing Numeric Data■■NCHAR and
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Storing Numeric DataThe absence of
Page 106 and 107: Storing Datetime Data5.4.1.2 Using
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Page 118 and 119: Using Pseudocolumns, Sequences, and
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Page 152 and 153: Handling PL/SQL Errors7-26 SQL Deve
Page 154 and 155: Overview of Packages and Subprogram
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Page 164 and 165: Overview of Triggers9.1.1 Types of
Page 166 and 167: Overview of Triggers■■A trigger
Page 168 and 169: Designing TriggersNote: A procedure
Page 170 and 171: Using SQL*Plus■■■Running Scri
Page 172 and 173: Using SQL*PlusA SQL script file is
Page 174 and 175: Using SQL*Plus10-6 SQL Developer On
Page 176 and 177: Overview of Globalization Support
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Page 202 and 203: overview, 7-14EXPLAIN PLANexecution
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displaying output from PL/SQL, 7-9s
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disabling, 9-4enabling, 9-4error co
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Oracle SQL Developer

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