<apppML> Reference
The <AppML> Data Model:
<appml security="
security">
<datasource>
Datasource definition goes here
</datasource>
<filters>
Filter definitions goes here (if any)
</filters>
<update>
Update definitions goes here (if any)
</update>
<anything>
Anything you want to add to the model
</anything>
</appml>
<AppML>Security
<AppML> security is taken care of by the security attribute in the <AppML>
tag.
<appml security="artists">
An application starting with the security defined above, can only be run by a
user logged as an artist.
In this context, the user must be logged in with a username defined as a
member of the group "artists".
The <datasource> Element
The <datasource> element defines the 4 different types of data sources an
<AppML> application can have:
Sub Elements (only one can apply)
| Element |
Description |
| <database> |
Defines a database source |
| <xmlfile> |
Defines an XML source file |
| <csvfile> |
Defines a comma separated text file |
The <database> Element
The <database> element defines a database source.
Sub Elements
| Element |
Description |
| <connection> |
The name of a database connection |
| <execute> |
SQL to be executed before data retrieval (optional) |
| <sql> |
The SQL statement for retrieving data |
| <maintable> |
The main table for this application (optional) |
| <keyfield> |
The key field for the main table (optional) |
Data Stored in SQL Databases
This is the most common solution for data oriented applications.
<datasource>
<database>
<connection>CDDataBase</connection>
<sql>SELECT Artist, Title, Country FROM CD_Catalog</sql>
</database>
</datasource>
The model above selects three data items (Artist, Title, Country)
from a table called "CD_Catalog", in an SQL database called "CDDataBase".
The number of
rows returned is unknown.
Data Stored in XML Files
<AppML> can read data from XML files:
Example
<appml>
<datasource>
<xmlfile src="cd_catalog.xml">
<record>CD</record>
<item>
<name>Title</name>
<nodename>TITLE</nodename>
</item>
<item>
<name>Artist</name>
<nodename>ARTIST</nodename>
</item>
<item>
<name>Country</name>
<nodename>COUNTRY</nodename>
</item>
</xmlfile>
</datasource>
</appml>
Try it yourself »
This method makes it possible to store data in XML files on the server.
Data Stored in Text Files
<AppML> can read data from text files:
Example
<appml>
<datasource>
<csvfile src="cd_catalog.txt">
<item>
<name>Title</name>
<index>1</index>
</item>
<item>
<name>Artist</name>
<index>2</index>
</item>
<item>
<name>Price</name>
<index>5</index>
</item>
</csvfile>
</datasource>
</appml>
Try it yourself »
This method makes it possible to store data in Text files on the server.
Create a Database if Needed
With <AppML> you can also create a database if needed:
<database>
<connection>CDDataBase</connection>
<execute>
CREATE TABLE CD_catalog
(
CD_Id INT IDENTITY,
Title NVARCHAR(255),
Artist NVARCHAR(255),
Country NVARCHAR(255),
Company NVARCHAR(255),
Price NUMBER,Published INT)
</execute>
</database>
Perfect for rapid prototyping!
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