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63
CREATE_QUERIED_RECORD built-in
Description
When called from an On-Fetch trigger, creates a record on the block’s waiting list.  The waiting list is an
intermediary record buffer that contains records that have been fetched from the data source but have not
yet been placed on the block’s list of active records.  This built-in is included primarily for applications
using transactional triggers to run against a non-ORACLE data source.
Note that there is no way to remove a record from the waiting list.  Consequently, the application must
ensure that there is data available to be used for populating the record programmatically.
Syntax
PROCEDURE CREATE_QUERIED_RECORD;
Built-in Type   restricted procedure
Enter Query Mode  no
Parameters
none
CREATE_QUERIED_RECORD restrictions
•  In blocks with a large number of records, this procedure can have side effects on disk I/O, memory
allocation, or both.
CREATE_QUERIED_RECORD examples
/*   
** Built-in:  CREATE_QUERIED_RECORD
** Example:   Fetch the next N records into this block. Record
**            count kept in Global.Record_Count.
** trigger:   On-Fetch
*/
DECLARE
fetch_count NUMBER;
FUNCTION The_Next_Seq
RETURN NUMBER IS
CURSOR next_seq IS SELECT uniq_seq.NEXTVAL FROM DUAL;
tmp NUMBER;
BEGIN
OPEN next_seq;
FETCH next_seq INTO tmp;
CLOSE next_seq;
RETURN tmp;
END;
BEGIN
/*
** Determine how many records Form Builder is expecting us to
** fetch
*/
fetch_count := Get_Block_Property(’MYBLOCK’,RECORDS_TO_FETCH);
FOR i IN 1..fetch_count LOOP
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** Create the Queried Record into which we’ll deposit
** the values we’re about to fetch;
*/
Create_Queried_Record;
:Global.Record_Count := NVL(:Global.Record_Count,0)+1;
/*
** Populate the item in the queried record with a
** sequence function we declared above
*/
:myblock.numbercol := the_next_seq;
END LOOP;
END;
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CREATE_RECORD built-in
Description
Creates a new record in the current block after the current record.  Form Builder then navigates to the
new record.
Syntax
PROCEDURE CREATE_RECORD;
Built-in Type   restricted procedure
Enter Query Mode  no
Parameters
none
CREATE_RECORD examples
/*   
** Built-in:  CREATE_RECORD
** Example:   Populate new records in a block based on return
**            values from a query
*/
PROCEDURE Populate_Rows_Into_Block( projid NUMBER)  IS
CURSOR tempcur( cp_projid NUMBER ) IS
SELECT milestone_name, due_date
FROM milestone
WHERE project_id = cp_projid
ORDER BY due_date;
BEGIN
/* Add these records to the bottom of the block */
Last_Record;
/* Loop thru the records in the cursor */
FOR rec IN tempcur( projid ) LOOP
/*
** Create an empty record and set the current row’s
** Milestone_Name and Due_Date items.
*/
Create_Record;
: Milestone.Milestone_Name := rec.milestone_name;
: Milestone.Due_Date       := rec.due_date;
END LOOP;
First_Record;
END;
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66
CREATE_TIMER built-in
Description
Creates a new timer with the given name. You can indicate the interval and whether the timer should
repeat upon expiration or execute once only.  When the timer expires, Form Builder fires the When-
Timer-Expired trigger.
Syntax
FUNCTION CREATE_TIMER
(
timer_name    
VARCHAR2,
   milliseconds  
NUMBER
,
   iterate       
NUMBER);
Built-in Type   unrestricted function
Returns  Timer
Enter Query Mode  yes
Parameters
timer_name
Specifies the timer name of up to 30 alphanumeric characters.  The name
must begin with an alphabetic character.  The data type of the name is
VARCHAR2.
milliseconds
Specifies the duration of the timer in milliseconds.  The range of values
allowed for this parameter is 1 to 2147483648 milliseconds. Values >
2147483648 will be rounded down to 2147483648.  Note that only
positive numbers are allowed.  The data type of the parameter is
NUMBER.  See Restrictions below for more information.
iterate
Specifies whether the timer should repeat or not upon expiration.  Takes the
following constants as arguments:
REPEAT  Indicates that the timer should repeat upon expiration.  Default.
NO_REPEAT  Indicates that the timer should not repeat upon expiration,
but is to be used once only, until explicitly called again.
CREATE_TIMER restrictions
•  Values > 2147483648 will be rounded down to 2147483648.
•  Milliseconds cannot be expressed as a decimal.
•  No two timers can share the same name in the same form instance, regardless of case.
•  If there is no When-Timer-Expired trigger defined at the execution of a timer, Form Builder returns
an error.
•  If there is no When-Timer-Expired trigger defined at the execution of a timer, and the timer is a
repeating timer, subsequent repetitions are canceled, but the timer is retained.
•  If there is no When-Timer-Expired trigger defined at the execution of a timer, and the timer is not a
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repeating timer, the timer is deleted.
CREATE_TIMER examples
The following example creates a timer called EMP_TIMER, and sets it to 60 seconds and an iterate
value of NO_REPEAT:
DECLARE
timer_id Timer;
one_minute NUMBER(5) := 60000;
BEGIN
timer_id := CREATE_TIMER(’emp_timer’, one_minute,
NO_REPEAT);
END;
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68
CREATE_VAR built-in
Description
Creates an empty, unnamed variant.
There are two versions of the function, one for scalars and the other for arrays.
Syntax
FUNCTION CREATE_VAR
(persistence BOOLEAN)
RETURN newvar OLEVAR;
...or...
FUNCTION CREATE_VAR
(bounds OLE_SAFEARRAYBOUNDS,
vtype VT_TYPE,
persistence BOOLEAN)
RETURN newvar OLEVAR;
Built-in Type  unrestricted function
Returns  the created OLE variant.
Parameters
persistence
Controls the persistence of the variant after its creation.  A
boolean value of TRUE establishes the variant as
persistent; a value of FALSE establishes the variant as
non-persistent.
This is an optional parameter.  If not specified, the default
value is non-persistent.
bounds
A PL/SQL table that specifies the dimensions to be given
to the created array.
For more information about the contents and layout of this
parameter and the type OLE_SAFEARRAYBOUNDS,
see ARRAY TYPES FOR OLE SUPPORT.
vtype
The OLE variant type (VT_TYPE) of the elements in the
created array.  If the array will contain mixed element
types, specify VT_VARIANT.
Usage Notes
The created variant is untyped, unless it is an array -- in which case its elements have the type you
specify.
The created variant is also without a value.  Use the SET_VAR function to assign an initial value
and type to the variant.
A persistent variant exists across trigger invocations.  A non-persistent variant exists only as long as
the trigger that spawned the call runs.  See also DESTROY_VARIANT
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69
CUT_REGION built-in
Description
Removes a selected region of a text item or an image item from the screen and stores it in the paste
buffer until you cut or copy another selected region.
Syntax
PROCEDURE CUT_REGION;
Built-in Type   restricted procedure
Enter Query Mode  yes
Parameters
none
Usage Notes
Use CUT_REGION, as well as the other editing functions, on text and image items only.  The cut and
copy functions transfer the selected region into the system clipboard until you indicate the paste target.
At that time, the cut or copied content is pasted onto the target location.
70
DBMS_ERROR_CODE built-in
Description
Returns the error number of the last database error that was detected.
Syntax
FUNCTION DBMS_ERROR_CODE;
Built-in Type   unrestricted function
Enter Query Mode  yes
Parameters
none
Usage Notes
For recursive errors, this built-in returns the code of the first message in the stack, so the error text must
be parsed for numbers of subsequent messages.
DBMS_ERROR_CODE examples
/*   
** Built-in:  DBMS_ERROR_CODE,DBMS_ERROR_TEXT
** Example:   Reword certain Form Builder error messages by
**            evaluating the DBMS error code that caused them
** trigger:   On-Error
*/
DECLARE
errcode     NUMBER        := ERROR_CODE;
dbmserrcode NUMBER;
dbmserrtext VARCHAR2(200);
BEGIN
IF errcode = 40508 THEN
/*
** Form Builder had a problem INSERTing, so
** look at the Database error which
** caused the problem.
*/
dbmserrcode := DBMS_ERROR_CODE;
dbmserrtext := DBMS_ERROR_TEXT;
IF dbmserrcode = -1438 THEN
/*
** ORA-01438 is "value too large for column"
*/
Message(’Your number is too large. Try again.’);
ELSIF dbmserrcode = -1400 THEN
/*
** ORA-01400 is "Mandatory column is NULL"
*/
Message(’You forgot to provide a value. Try again.’);
ELSE
/*
** Printout a generic message with the database
** error string in it.
71
*/
Message(’Insert failed because of ’||dbmserrtext);
END IF;
END IF;
END;
72
DBMS_ERROR_TEXT built-in
Description
Returns the message number (such as ORA-01438) and message text of the database error.
Syntax
FUNCTION DBMS_ERROR_TEXT;
Built-in Type   unrestricted function
Enter Query Mode  yes
Parameters
none
Usage Notes
You can use this function to test database error messages during exception handling routines.
DBMS_ERROR_TEXT returns the entire sequence of recursive errors.
DBMS_ERROR_TEXT examples
/*   
** Built-in:  DBMS_ERROR_CODE,DBMS_ERROR_TEXT
** Example:   Reword certain Form Builder error messages by
**            evaluating the DBMS error code that caused them
** trigger:   On-Error
*/
DECLARE
errcode     NUMBER        := ERROR_CODE;
dbmserrcode NUMBER;
dbmserrtext VARCHAR2(200);
BEGIN
IF errcode = 40508 THEN
/*
** Form Builder had a problem INSERTing, so
** look at the Database error which
** caused the problem.
*/
dbmserrcode := DBMS_ERROR_CODE;
dbmserrtext := DBMS_ERROR_TEXT;
IF dbmserrcode = -1438 THEN
/*
** ORA-01438 is "value too large for column"
*/
Message(’Your number is too large. Try again.’);
ELSIF dbmserrcode = -1400 THEN
/*
** ORA-01400 is "Mandatory column is NULL"
*/
Message(’You forgot to provide a value. Try again.’);
ELSE
/*
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