Advanced Techniques - Unique number generator
The unique number generator makes it possible to generate automatically
incrementing numbers according to predefined criteria. In these cases,
the number can consist of any required combination of parts (number,
date, time, word).
The best known examples of unique numbers are probably inventory numbers.
When creating a data record for an item of stock in a corresponding Intrexx
application, you can use the unique number generator to generate numbers
that are continuous and incremental,
and are constructed according to a defined syntax
(e.g. Inv-2013-06-0001, Inv-2013-06-0002, etc.).
It also makes sense to use the unique number generator for orders,
parts lists or customer numbers.
Unique numbers can be generated via the data handler of a data field.
A check is made before the record is saved, to determine which unique number
in the previously saved data records has the highest allocated number at
that point in time. When the data record is saved, a new number –
the previous highest plus 1 – will be written to the data field.
A sequential number assignment is guaranteed with this method. Even if
the portal service is restarted, the highest allocated unique number
will be determined and used as the basis for calculating the subsequent numbers.
Automatically incrementing numbers can also be generated via Groovy.
when the page is loaded, it is not certain whether it will also be saved.
Configure the datahandler
Create a new application in the Intrexx Portal Manager based on the
Basic application template
Create a new data field
in the data group.
Since values with Date, Integer and String format can be included in
a unique number, please use data fields with the "Short text" data
type only. Do not place a unique number in a system data field. Only
use data fields that you have created yourself. Assign the title
"Unique number" here.
Display the data fields in the application structure by selecting
"Show data fields" from the Edit menu.
Please activate the expert options
if you have not done so already.
Open the properties dialog of the "Unique number" data field by
double-clicking on it and then switch to the "Expert" tab.
as the value of the
"datahanlder" attribute and click on "OK".
Now you can add the "Unique number" field as a column in the
table on the "All Entries" page
Save the application.
Create the UniqueNumber.xml file
The UniqueNumber.xml file contains the definition of all
unique numbers in the current portal.
<?xml version="1.0" encoding="UTF-8"?>
<uniquenumber name="myUniqueNumber1" guid="guid" link-datafield="guid">
<part type="constant" value="UP-"/>
<part type="year" condition="true" format="yyyy"/>
<part type="month" condition="true" format="mm"/>
<part type="day" condition="true" format="dd"/>
<part type="constant" value="-"/>
<part type="number" format="###"/>
Create a new file with a standard text editor, and copy the code
above into the file. Amend the values below as follows:
Name of the respective unique number (free choice, must be unique)
GUID of the respective unique number (free choice, must be unique)
GUID of the text data field where the unique number will be generated
- <part .../>
Definition of a part of the unique number
Enter a name for your unique number in "name". A GUID for the unique
number can be generated easily via the
Extras menu / Create GUID
To identify the GUID of the data field, where the unique number will be
generated, select the data field in the application structure and press the F4 key.
In the UniqueNumber.xml file, you can define as many unique numbers
as you require. For additional unique number definitions, copy this section
<uniquenumber name=" myUniqueNumber1" guid="guid" link-datafield="guid">
and replace the entries for "name", "guid", "link-datafield" and the
"part types" with the corresponding new values.
In the "part-type" tags that follow, you can specify one part of the
unique number in each tag. In our example here, the new number
begins with "UP-", followed by the four-digit year, the month,
the day, a hyphen and a three digit number that is automatically
incremented. More information about this is available in the
Save the file with the name "UniqueNumber.xml" in the
portal directory internal/cfg
Now the portal service needs to be restarted.
You can see the result in the browser below.
The individual parts of a unique number and their ordering are
defined by the different "part type" elements.
part type: constant
<part type="constant" value="UP-"/<
Generates a fixed string value of your choice.
part type: number
<part type="number" format="###"/<
Generates an incremental number that increases by 1 each time.
The length of the number is controlled by the number of hash characters (#). Thus,
format="###" generates three digit numbers for the numeric part of the
unique number in the series 001, 002, 003, etc. If the maximum number is
reached (in this example 999), the sequence is restarted from 001.
part type: date/time
Each part of the date/time must be created individually. All of the required part types from year through
month, day, hour, minute to second are available here.
If a condition is used with the date/time part types (year, month, day,
hour, minute and second), then the number part of the unique number will
restart from 1 if one of the corresponding date/time parts change.
When using such a condition, however, it is important to ensure that
the date/time part types are placed in sequence from the highest (year)
to the lowest (second).
<part type="year" condition="true"/>
<part type="month" condition="true"/>
<part type="day" condition="true"/>
The "format" option allows you to customize the format of
the date/time parts.
<part type="year" format="yyyy"/>
<part type="month" format="mm"/>
<part type="day" format="dd"/>