Database Query

This control provides querying for relational databases. When this control is selected, there a menu appears on the right side of it with the Query designer. When selecting the Data tab, under the Data Sources, there is an "Add New" button. One of the options is Database Query.

Query

Parameters

Target schema, table, and include all fields option are presented in this section.

Target Schema
Select one of the newly created or imported database schemas from this dropdown menu.

Target Table
After selecting the target schema, select a newly created or imported database table from the dropdown menu.

Include All Fields?

Yes, include all fields always. : Check this option if you want to include all fields in the query result.

Fields

Select the fields you want to include in the query result. You can specify field orders using the arrow buttons on the right side.

Field
Lists columns of selected database and its related tables.

Caption
The caption to be displayed to the user. If not specified, the field is hidden from the user.

Formula
The formula to use for aggregate values.

Mapped XPath
XPath to map field value on the data model. If not specified, the Name property is used.

Order

Field
Specify field(s) to regard when ordering.

Order Type
Select ordering type.

Ascending
Descending

Criteria

Add as many criteria as you want to create your where clause.

Field
Specify field(s) to filter select query.

Formula
The formula to use for aggregate values.

Count
Sum
Average
Minimum
Maximum
Average of distinct values
Sum of distinct values
Count of distinct values

Comparison
Criteria value comparison.

Equals
Different
Like
Less than
Greater than
Less than or equals
Greater than or equals

Value
The criteria value. You should use an expression between these double brackets {{expression}}. The expression should be an XPath, for example {{Search/Identity}}.

Condition
Condition to merge with next criteria.

And
Or

Ignore Values
Enter a value(s) to ignore in the select query.

Blocks

In order to isolate conditions properly, you may use a block structure for the where clause. Add as many blocks as you want and select their condition.

Sub Queries

Creates a sub-query in your select query.

Relation
Lists relations of the specified table from the main query.

Mapped XPath
XPath to map field value on the data model. If not specified, the Name property is used.

Include All Fields
Check this option if you want to include all fields in the query result.

Results

Options to map and format the result data.

Item XPath
XPath of the item that will be listed in the related control. If it is left empty, which is the same as the * value, all resulting items are listed.

List Item Formatting

Customizes the format of the control's display options.

Display Text Format
Specify the format to display the result text. You can use column names inside curly braces. Ex: {{Name}} - {{Id}}

Value Format
Specify the format of the value. You can use column names inside curly braces. Ex: {{Id}} - {{Type}}

Selection Mappings

In order to map a column of data from the query result into an XPath, create a mapping by pressing Add New button.

Source
Name of the data column to be mapped.

Target
XPath to map data.

Hierarchy Column

In case you have a hierarchy on a table determined by one of its columns, use this section to specify the parent column's name to display your data hierarchically or leave it empty to display data as a plain list.