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https://www.homeworkping.com/Oracle Forms 10g release 2 : Demos, Tips and Techniques

  

Home page   1. Introduction 

Here is a collection of Oracle Forms 10g sample dialogs extracted from a complete Oracle Forms tutorial.This tutorial has been written in French and it would be too time consuming to translate it all in English.This is the reason why I have only extracted and translated these sample dialogs. The purpose of this article is not to teach how to build a new form from scratch. It intends to show some of the main advanced features of the product. To clearly understand in details how these dialogs work, you will have to open them in the Forms Builder and examine them thoroughly.However, in this article, I am going to explain the best I can the most important mechanisms of each sample. These sample have been tested with an Oracle Forms 10g release 10.1.2.0.2 on an Oracle Database 10g Express Edition Release 10.2.0.1.0.

  2. Description of the sample dialogs 

 2.1 Main screen 

TUTO_FORMS.FMB This dialog is the entry point of the samples. Click on a button to start the corresponding dialog.  

2.2 Canvases 

TEST_CANVAS.FMB This sample shows three types of canvas : 

         The content canvas (light green)         The stacked canvas (white)         The tab canvas (dark green)

  Stacked canvasA stacked canvas is displayed atop—or stacked on—the content canvas assigned to the current window. Stacked canvases obscure some part of the underlying content canvas, and often are shown and hidden programmatically. You can display more than one stacked canvas in a window at the same timeA stacked canvas allows to scroll a big canvas in a delimited window.In this sample, the stacked canvas (CV_EMP_1) is twice bigger than its viewport. The <Down> button allows to move the stacked canvas programatically: Set_View_Property('CV_EMP_1', VIEWPORT_Y_POS_ON_CANVAS, 140) ; 

 Here are the properties of this stacked canvas: ViewportViewport X position        77Viewport Y position       11Viewport Width             212Viewport Height             138 PhysicalViewport X position on canvas    0Viewport Y position on canvas    0Width                                       212Height                                      324  The second Stacked canvas (CV_EMP_3) demonstrates how to integrate in a Tab canvas: 

 

  2.3 Blocks 2.3.1 Block based on a complex view 

TEST_BLOC_VUE.FMB This sample show how you can base a block on a view that aggregate the columns of several tables (in this case, DEPT and EMP) and when you can insert, update and delete from the target tables from this view. The code that handles the target table is located in a program unit, called from the three block-level triggers: 

         ON-INSERT         ON-UPDATE         ON-LOCK

 

This is the code of the ins_upd_emp_dept procedure: PROCEDURE ins_upd_emp_dept IS  LN$Dummy PLS_INTEGER := 0 ;BEGIN  -- Table DEPT --  Begin  Select 1  Into LN$Dummy  From DUAL  Where exists( select deptno from dept where deptno = :EMP_DEPT.DEPTNO ) ;    -- Found -> update --       Message('Update DEPT table');       UPDATE DEPT       SET    DNAME = :EMP_DEPT.DNAME       WHERE  DEPTNO = :EMP_DEPT.DEPTNO ;  Exception       When no_data_found Then    -- Not found -> insert --       Message('Insert into DEPT table');       INSERT INTO DEPT ( DEPTNO, DNAME )       VALUES ( :EMP_DEPT.DEPTNO, :EMP_DEPT.DNAME ) ;  End ;   -- Table EMP --  Begin  Select 1  Into LN$Dummy  From DUAL  Where exists( select empno from emp where empno = :EMP_DEPT.EMPNO ) ;    -- Found -> update --       Message('Update EMP table');       UPDATE EMP       SET    ENAME = :EMP_DEPT.ENAME       WHERE  EMPNO = :EMP_DEPT.EMPNO ;  Exception       When no_data_found Then    -- Not found -> insert --       Message('Insert into EMP table');       INSERT INTO EMP ( EMPNO, ENAME )       VALUES ( :EMP_DEPT.EMPNO, :EMP_DEPT.ENAME ) ;  End ; END;

 2.3.2 Block based on stored procedures

 

TEST_BLOC_PROC.FMB This sample demonstrates how a block can be based on stored procedures.This feature can be implemented in two ways: 

         A REF CURSOR         A PL/SQL table

 In addition to that, there are also two different locations where to implement this functionality: 

         The ON-xxx triggers         The transactionnal triggers

 In this sample, the top block uses a REF CURSOR with the ON-xxx triggersThe bottom block uses a collection with the standard transactionnal triggers. The stored procedures are located in the PKG_EMP package shipped with the scripts. 

Block1 (EMP), REF CURSOR and ON-xxx triggers 

  The Query Data Source Type is set to Procedure and the Query Data Source Name indicates the name of the query procedure. The insert, update, delete and lock orders are managed in the corresponding On-xxx triggers: Example of ON-INSERT trigger: DECLARE    LR$Emp emp_pkg.emp_rec;BEGIN       LR$Emp.empno := :emp.empno;    LR$Emp.ename := :emp.ename;    LR$Emp.job   := :emp.job;    LR$Emp.sal   := :emp.sal;    LR$Emp.comm  := :emp.comm;     emp_pkg.emp_insert( LR$Emp );END; The variable used as parameter is of type of emp_pkg.emp_rec   TYPE emp_rec IS RECORD(    empno    emp.empno%TYPE,    ename    emp.ename%TYPE,    job      emp.job%TYPE,    sal      emp.sal%TYPE,    comm     emp.comm%TYPE); Then the emp_pkg.emp_insert() stored procedure:   ------------  -- Insert --  ------------  PROCEDURE emp_insert(r IN emp_rec) IS  BEGIN    INSERT INTO emp (empno, ename, job, sal, comm)       VALUES(r.empno, r.ename, r.job, r.sal, r.comm);  END emp_insert;   Block2 (EMP_TRG), Collection and transactionnal triggers 

 This block uses a collection of records with the emp.pkg.emp_query procedure.   TYPE emptab IS TABLE OF emp_rec INDEX BY BINARY_INTEGER;   PROCEDURE emp_query(emp_data IN OUT emptab) IS    ii NUMBER;    CURSOR empselect IS      SELECT empno, ename, job, sal, comm FROM emp         ORDER BY ename ;  BEGIN    OPEN empselect;    ii := 1;    LOOP      FETCH empselect INTO        emp_data( ii ).empno,        emp_data( ii ).ename,        emp_data( ii ).job,        emp_data( ii ).sal,        emp_data( ii ).comm;      EXIT WHEN empselect%NOTFOUND;      ii := ii + 1;    END LOOP;  END emp_query; The collection of records is an IN OUT parameter, read from the database and returned to Forms. The insert, update,delete and lock orders are also managed by stored procedures.(see them in detail in the EMP_PKG package) 

 Have also a look at the Query Data Source Column property that manages the relation between the columns of the collection and the items of the block. 

  2.3.3 Block based on a relational table that contains a collection

 

TEST_COLLECTION.FMB In this dialog, we can see how to handle a table that contains a nested table (collection).There is no standard buit-in to base a block on a collection, but we will see how easy it is to work with this sort of object via the ON-xxx triggers. Here is the description of the table (ARTICLES)  CREATE TABLE ARTICLES   (   CODE     VARCHAR2(20 BYTE),       LIBELLE  VARCHAR2(100 BYTE),       PRIX     NUMBER(8,2),       QTETOT   NUMBER(8,0),       CASES    TAB_TYP_CASE   ) NESTED TABLE CASES STORE AS CASES_NT RETURN AS VALUE; TAB_TYP_CASE is a table of objects of type :  TYP_CASE create or replace TYPE TYP_CASE AS OBJECT (   EMP   VARCHAR2(10),   QTE    NUMBER ) In this sample, the first block (ARTICLES) displays the standard columns of the ARTICLE table and the second block (detail) displays the columns of its nested table. 

Populate the detail block (nested table) The detail block (CASES) is dynamically populated each time a master record change in a When-New-Record-Instance of the master block: Declare   LC$Req  Varchar2(256) ;Begin  If :ARTICLES.CODE Is not null Then     -- Dynamic query of secondary block --     LC$Req := '(SELECT cases.EMP, cases.QTE FROM TABLE ( SELECT cases FROM articles WHERE code = ''' || :ARTICLES.CODE || ''') cases)' ;     Go_Block('CASES' );     Clear_Block ;     Set_Block_Property( 'CASES', QUERY_DATA_SOURCE_NAME, LC$Req ) ;     -- populate the block --     Execute_Query ;     Go_Block('ARTICLES') ;  Else     Go_Block('CASES' );     Clear_Block ;     Go_Block('ARTICLES') ;  End if ;End ;   Because it is not possible to create a new article with a NULL collection, we have to handle the insertion into the ARTICLE table in a ON-INSERT trigger: ----------------------------------------------------------------  we are doing an explicit insert because the new record  ----  cannot contain a NULL collection                        ----------------------------------------------------------------INSERT INTO ARTICLES  (    CODE,    LIBELLE,    PRIX,    QTETOT,    CASES  )  VALUES  (    :ARTICLES.CODE,    :ARTICLES.LIBELLE,    :ARTICLES.PRIX,    :ARTICLES.QTETOT,    TAB_TYP_CASE()  -- insert an empty collection  )  ; Indeed, if we insert a NULL collection, it will be no longer possible to insert anything in the nested table. Then after, it is easy to manage the detail records with the ON-xxx triggers of the CASES block: ON-INSERT: -- Insert the row in the collection --INSERT INTO TABLE (    SELECT      cases   FROM

      articles   WHERE      code = :ARTICLES.CODE ) Values (   TYP_CASE( :CASES.EMP, :CASES.QTE ) );  ON-DELETE: -- Delete row in the collection --DELETE FROM TABLE (    SELECT      cases   FROM      articles   WHERE      code = :ARTICLES.CODE ) cases WHERE   cases.emp = :CASES.EMP ; etc. 

 2.3.4 Block based on multiple data sources 

TEST_DATA_SOURCES.FMB I this sample dialog, we can see how to base a block on several tables that share an identical structure.(see the JANVIER, FEVRIER and MARS tables created by the install.sql script) The list item is populated with the name of three tables that share the same structure: 

 Then, the source table of the block is changed dynamically in the When-List-Changed trigger: If :CTRL.CHOIX is not null Then

   :global.choix := :ctrl.choix ;   clear_form ;   :ctrl.choix := :global.choix ;   -- change the Query Data Source --   Set_Block_Property('TEST2', QUERY_DATA_SOURCE_NAME, :global.CHOIX );   go_block('TEST2');   execute_query;End if ;    

  2.3.5 Block based on an object table that contains a collection of references 

TEST_OBJETS.FMB Let’s see how to manage an object table that contains a collection of references. This sample is based on the object table (ARTICLE_OBJ) that contains a collection of references: create or replace TYPE REF_TYP_EMP AS OBJECT(  ref_emp REF TYP_EMP) create or replace TYPE TAB_REF_TYP_EMP AS TABLE OF REF_TYP_EMP create or replace TYPE TYP_ARTICLES AS OBJECT(  CODE     VARCHAR2 (20),  LIBELLE  VARCHAR2 (100),  PRIX     NUMBER (8,2),  QTETOT   NUMBER (8),  REMP     TAB_REF_TYP_EMP  -- collection)  CREATE TABLE ARTICLES_OBJ OF TYP_ARTICLES

 NESTED TABLE REMP STORE AS REMP_NT RETURN AS VALUE;   The tip is the same that the one used to manage the relational table with nested table: - A when-New-Record-Instance  trigger on the master block to populate the detail block (the collection of references): Declare  LC$Req  Varchar2(256) ;Begin  If :ARTICLES.CODE Is not null Then     -- Dynamic query of secondary block --     LC$Req := '(SELECT emp.ref_emp.emp EMP, emp.ref_emp.qte QTE       FROM TABLE( SELECT REMP FROM articles_obj WHERE CODE = ''' || :ARTICLES.CODE || ''') emp       WHERE emp.ref_emp.art = ''' || :ARTICLES.CODE || ''')' ;     Go_Block('CASES' );     Clear_Block ;     -- change the Query Data Source Name --     Set_Block_Property( 'CASES', QUERY_DATA_SOURCE_NAME, LC$Req ) ;     -- populate the block --     Execute_Query ;     Go_Block('ARTICLES') ;  Else     Go_Block('CASES' );     Clear_Block ;     Go_Block('ARTICLES') ;  End if ;End ;  - An ON-INSERT trigger to insert a new record with an empty collection: ---------------------------------------------------------  We are doing an implicit insert because the new  ----  record cannot contain a NULL collection          ---------------------------------------------------------INSERT INTO ARTICLES_OBJVALUES(  TYP_ARTICLES  (     :ARTICLES.CODE,     :ARTICLES.LIBELLE,     :ARTICLES.PRIX,     :ARTICLES.QTETOT,     TAB_REF_TYP_EMP()   )) ;  The collection of references is managed with the corresponding ON-xxx trigger of the detail block: ON-INSERT: -- Insert a row (REF) in the collection --Declare       LC$Req Varchar2(256) ;Begin        LC$Req := 'INSERT INTO TABLE       ( SELECT remp FROM ARTICLES_OBJ WHERE code = ''' || :ARTICLES.CODE  || ''')

       VALUES       ( REF_TYP_EMP ( (SELECT REF(a) FROM EMP_OBJ a WHERE a.ART = '''         || :ARTICLES.CODE || ''' AND a.EMP = ''' || :CASES.EMP || ''') ) )' ;             Forms_Ddl( LC$Req ) ; End ; ON-DELETE: -- Delete the row (REF) of the collection --DELETE FROM TABLE  ( SELECT remp FROM ARTICLES_OBJ WHERE code = :ARTICLES.CODE ) empWHERE   emp.ref_emp.art = :ARTICLES.CODEAnd   emp.ref_emp.emp = :CASES.EMP;

  2.4 Items  2.4.1 Principal items 

TEST_ITEMS.FMB Here is a description of the main items.Click everywhere on each item to see some information messages and some particular behaviours.

  2.4.2 List items 

TEST_LISTES.FMB Let’s study and handle the three sorts of list item and also the different ways to populate them.In this sample, the three list items are synchronized. Change the value of the first list and it will adapt the content of the second then the content of the third. For each new list value, the corresponding value and label are displayed. a) The first list item is populated with the RG_MOIS record group:   -- List 1 --  errcode := Populate_Group( 'RG_MOIS' );   CLEAR_LIST('BLOC2.LISTE1');  POPULATE_LIST('BLOC2.LISTE1', 'RG_MOIS' );  -- Select the first value --  :BLOC2.LISTE1 := Get_List_Element_Value('BLOC2.LISTE1', 1 ) ; b) Then init the second list item   -- Update the weeks list --  errcode := Populate_Group( 'RG_SEMAINES' );   CLEAR_LIST('BLOC2.LISTE2');  POPULATE_LIST('BLOC2.LISTE2', 'RG_SEMAINES' );   -- Select the first value --  :BLOC2.LISTE2 := Get_List_Element_Value('BLOC2.LISTE2', 1 ) ; c) That finally init the third list item: PROCEDURE Init_Liste3 IS   LC$D    Varchar2(12) ;   LC$Day Varchar2(20) ;BEGIN   -- Update the days list --   LC$D := '01/01/2005' ;   Clear_List( 'BLOC2.LISTE3' );  

   For i IN 0..6 Loop      SELECT        to_char( To_date(LC$D, 'DD/MM/YYYY' ) + (i + ((To_number(:BLOC2.LISTE2)-1) * 7)), 'FMDay DD Month' )      Into        LC$Day      FROM dual ;           Add_List_Element('BLOC2.LISTE3', i + 1, LC$Day, LC$Day ) ;                 End loop ;     -- Select the first value --   :BLOC2.LISTE3 := Get_List_Element_Value('BLOC2.LISTE3', 1 ) ;  Exception   When Others then      Null ;       END;

  2.4.3 Image items 

ALBUM_PHOTO.FMB This dialog is the main part of the ensemble that allows to search, attach and display images. You can build a photo album based on a one image’s column table.   CREATE TABLE PHOTOS   (   LEGENDE      VARCHAR2(100 BYTE),       PHOTO        BLOB NOT NULL ENABLE,       FORMAT       VARCHAR2(50 BYTE) NOT NULL ENABLE,       CREDIT       VARCHAR2(50 BYTE) NOT NULL ENABLE,       LIEN         VARCHAR2(100 BYTE),       IDENTIFIANT  NUMBER(5,0) NOT NULL ENABLE,       NOM          VARCHAR2(50 BYTE),        CONSTRAINT PHOTO_PK PRIMARY KEY (IDENTIFIANT) ENABLE   ) ; It shows two ways to search a filename on the local machine with and without Webutil.  By clicking on a picture, you can navigate on another canvas to display the detail of the picture: 

  

CHARGE_PHOTO.FMB The get_file_name sample dialog is only a “pure exercice of style” , because it is so easy to pick-up a file with the File_Open_Dialog() Webutil function.This sample is interesting to see how to use the HOST() and TEXT_IO() functions to get the list of the local machine drives and their content. 

CHARGE_PHOTO_WEBUTIL.FMB Another dialog to store the picture and its properties.  

2.4.4 Java Bean component 

TEST_GRAPH.FMB Here is a sample to demonstrate how to handle a bean area.This dialog use the Oracle FormsGraph Java Bean that is part of the Oracle Forms demos. You can download the FormsGraph.jar file on the OTN pagehttp://www.oracle.com/technology/sample_code/products/forms/files/formsgraph_patch2005.zip  

2.4.5 Calculated items 

TESTS_CALCUL.FMB Let’s see how to use the calculated items. The first calculated item use the Summary calculation mode: 

  The third one use a Formula calculation mode 

  2.5 Alerts 

TEST_ALERTES_MESSAGES.FMB This dialog shows how to use the Alert boxes to build the messaging engine of your Forms application. The message texts are read from the database then displayed via Alert boxes.To reduce the number of messages needed in the application, some of  them can take from 1 up to 3 parmeters (%1, %2 and %3). A pipe (|) character allows to split the message on several lines. The main block is based on the MESSAGES table.    CREATE TABLE  MESSAGES   (   CODE    NUMBER(5,0) NOT NULL ENABLE,             -- unique identifiant       TEXTE   VARCHAR2(256) NOT NULL ENABLE,           -- text of the message       TITRE   VARCHAR2(100),                           -- title of the alert       STOP    VARCHAR2(1) DEFAULT 'N' NOT NULL ENABLE, -- Shall we stop the process ? (raise form_trigger_failure)       ALERTE  VARCHAR2(15),                            -- name of the alert box        CONSTRAINT MSG_PK PRIMARY KEY (CODE) ENABLE   )  This sample use the Affiche_Message() procedure of the TUTO_FORMS pl/sql library to display the messages.These messages can be displayed through the 3 alert boxes available in every dialog of this demo.

          AL_ERREUR wich is the simple “OK” alert box.         AL_MSG_OUI_NON wich is a yes/no alert box (default yes)         AL_MSG_NON_OUI wich is a yes/no alert box (default no)

  2.6 Property classes and visual attributes 

TEST_CLASSES_PROP.FMB Let’s see some ways to use the property classes and the visual attributes to colorize and highlight dynamically different objects of the form (alert, item, current record, etc.).Property classes and visual attributes are located in the OBJ_TUTO_FORMS.olb object library.

 2.7 Forms internal triggering events 

TEST_CYCLES.FMB This dialog allows you to understand what trigger fire and in what order when you use the application. Before each particular action, you can clear the list of triggers window.This window show you what trigger is firing in what order and from what block and what item. 

  3. Installation steps 

This sample dialog need database objects to run.All the necessary objects are provided in the tutoforms10g.zip file shipped with the article.  This zip file contains 2 sub directories: /config that contains the configuration files./scripts that contains the Sql script files to create the database objects.  

         Download the tutoforms10g.zip file 

         Unzip the tutoforms10g.zip file under your <DEVSUITE_HOME>/forms/ directory. 

         Create a new user in your database 

         With Sql*plus or SqlDeveloper, run the /scripts/install.sql scriptnote : because this demo use the Webutil functions, the Oracle user where you have created these objects must have the WEBUTIL_DB package compiled or a grant EXECUTE to this package if it is present in another schema.

          Under the /tutoforms/ directory compile all the source modules

You can use the compile_all.bat file located in the same directory to compile all objects at once.      e.g.     compile_all user/password@instance

          Edit the /tutoforms/config/tutforms10g.env file to indicate your own settings (in

blue in this example) 

#oracle home  adapt this value to your own settingORACLE_HOME=D:\Dev10gR2 FORMS_PATH=%ORACLE_HOME%\forms\tutoformsORACLE_PATH=%ORACLE_HOME%\forms\tutoformsFORMS_TRACE_PATH=%ORACLE_HOME%\forms\tutoformsCLASSPATH=D:\Dev10gR2\forms\java\frmwebutil.jar;%ORACLE_HOME%\jlib\debugger.jar;%ORACLE_HOME%\forms\tutoforms\FormsGraph.jar;%ORACLE_HOME%\forms\tutoforms\myIcons.jar;

 # webutil config file pathWEBUTIL_CONFIG=D:\Dev10gR2\forms\server\webutil.cfg

          Edit the /tutoforms/config/ add_to_formsweb.cfg file to set your own database

connect string (in blue in this example) 

...lookAndFeel=OraclecolorScheme=blaflogo=no#don't forget to put your own database connexionuserid=tutoforms10g/tutoforms10g@XE

          Copy the /tutoforms/config/tutforms10g.env to the /forms/server directory

          add the /tutoforms/config/ add_to_formsweb.cfg at the end of

your /forms/server/formsweb.cfg file  

         Then, you can start the demo by indicating the new [tutoforms10g] formsweb.cfg section.

  

http://machine:8890/forms/frmservlet?config=tutoforms10g