The Meta Model

The meta model is built up from a few classes used to describes different kind of objects, such as database objects or GUI components. Three properties is common for all classes

• MetaType = Describes what kind of meta object this is.
• MetaCode = Identifies one meta object, unique within an application
• ParentMetaCode = Can be either ROOT if the object is on the application level or pointing to another MetaCode if the meta object is a child of anoter object.

ApplicationItem

• Used to describe applications
• Example new ApplicationItem() { Id = 1, Description = "An app for managing customers", MetaCode = "CUSTOMER", Title "Customer", DbName = "Customer" }

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DatabaseItem

• Used to describe database tables and columns used in one application
• Example new DatabaseItem() { AppMetaCode = "CUSTOMER", MetaType = "DATAVALUE", MetaCode = "CUSTOMERID", DbName = "CustomerId", ParentMetaCode = "ROOT", DataType = "STRING", Mandatory = true }

Valid MetaTypes

• DATACOLUMN
• DATATABLE

Valid DataTypes

• STRING
• TEXT
• INTEGER
• BOOLEAN
• 1DECIMAL
• 2DECIMAL
• 3DECIMAL

Note: DATATABLE is used for applications with sub tables, for example in the Order, Order Line pattern, where the Order Line table should be defined as a sub table. There's no need to define the Order table as a DATATABLE since one main table is always created for every application.

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ViewItem

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FunctionItem

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UserInterfaceItem

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UserInterfaceStructureItem

• Used to describe UI in applications
• Example: Create an emailbox in the Customer application client.InsertEntity(new UserInterfaceItem() { AppMetaCode = "CUSTOMER", MetaType = "EMAILBOX", MetaCode = "TBCUSTMAIL", DataColumn1MetaCode = "CUSTOMEREMAIL", Title = "Email", TitleLocalizationKey = "CUSTOMEREMAIL", ParentMetaCode = "CUSTPNL2", RowOrder = 1, ColumnOrder = 2 });

Valid MetaTypes

• PANEL
• TEXTBOX
• EMAILBOX
• NUMBOX
• TEXTAREA
• COMBOBOX
• DATEPICKER
• CHECKBOX
• LOOKUP
• IMAGEBOX
• IMAGE
• LABEL
• TEXTBLOCK
• STATICHTML
• SEARCHBOX

Note the attribute DataColumn1MetaCode which connects the UI component to a DatabaseItem