Call generic API request with URL parameters

Calls a generic Power BI API endpoint with URL parameters (e.g. filters). Supply the endpoint path and parameters in the Url parameter.

Standard SQL query example

This is the base query accepted by the connector. To execute it in SQL Server, you have to pass it to the Data Gateway via a Linked Server. See how to accomplish this using the examples below.

SELECT * 
FROM generic_request
WITH (Url='/groups?$filter=contains(name,''MyWorkspace'') or name eq ''My Blue Workspace''',
Filter='$.value[*]')


/*
EXPLANATION:
- This configuration calls Power BI REST API "Get Groups" endpoint and gets the Workspaces back.
- This is achieved by "/groups" value in the "Url" parameter.
- Workspaces are filtered on the Power BI REST API side by using the "$filter" URL parameter.
- Only those Workspaces are returned that:
  > contain a string value "MyWorkspace" or
  > if the Workspace name is "My Blue Workspace" (each single quote is escaped with two single quotes).
- The SQL query parameter "Filter" uses JsonPath "$.value[*]".
- This gets JSON objects from "value" array and transforms them into SQL rows.

MORE INFORMATION:
- About "Get Groups" REST API endpoint:
  https://learn.microsoft.com/en-us/rest/api/power-bi/groups/get-groups
- About JsonPath used in "Filter" parameter:
  https://zappysys.com/blog/jsonpath-examples-expression-cheetsheet  
*/

Using OPENQUERY in SQL Server

SELECT * FROM OPENQUERY([LS_TO_POWER_BI_IN_GATEWAY], 'SELECT * 
FROM generic_request
WITH (Url=''/groups?$filter=contains(name,''''MyWorkspace'''') or name eq ''''My Blue Workspace'''''',
Filter=''$.value[*]'')


/*
EXPLANATION:
- This configuration calls Power BI REST API "Get Groups" endpoint and gets the Workspaces back.
- This is achieved by "/groups" value in the "Url" parameter.
- Workspaces are filtered on the Power BI REST API side by using the "$filter" URL parameter.
- Only those Workspaces are returned that:
  > contain a string value "MyWorkspace" or
  > if the Workspace name is "My Blue Workspace" (each single quote is escaped with two single quotes).
- The SQL query parameter "Filter" uses JsonPath "$.value[*]".
- This gets JSON objects from "value" array and transforms them into SQL rows.

MORE INFORMATION:
- About "Get Groups" REST API endpoint:
  https://learn.microsoft.com/en-us/rest/api/power-bi/groups/get-groups
- About JsonPath used in "Filter" parameter:
  https://zappysys.com/blog/jsonpath-examples-expression-cheetsheet  
*/')

Using EXEC in SQL Server (handling larger SQL text)

The major drawback of OPENQUERY is its inability to incorporate variables within SQL statements. This often leads to the use of cumbersome dynamic SQL (with numerous ticks and escape characters).

Fortunately, starting with SQL 2005 and onwards, you can utilize the EXEC (your_sql) AT [LS_TO_POWER_BI_IN_GATEWAY] syntax.

DECLARE @MyQuery NVARCHAR(MAX) = 'SELECT * 
FROM generic_request
WITH (Url=''/groups?$filter=contains(name,''''MyWorkspace'''') or name eq ''''My Blue Workspace'''''',
Filter=''$.value[*]'')


/*
EXPLANATION:
- This configuration calls Power BI REST API "Get Groups" endpoint and gets the Workspaces back.
- This is achieved by "/groups" value in the "Url" parameter.
- Workspaces are filtered on the Power BI REST API side by using the "$filter" URL parameter.
- Only those Workspaces are returned that:
  > contain a string value "MyWorkspace" or
  > if the Workspace name is "My Blue Workspace" (each single quote is escaped with two single quotes).
- The SQL query parameter "Filter" uses JsonPath "$.value[*]".
- This gets JSON objects from "value" array and transforms them into SQL rows.

MORE INFORMATION:
- About "Get Groups" REST API endpoint:
  https://learn.microsoft.com/en-us/rest/api/power-bi/groups/get-groups
- About JsonPath used in "Filter" parameter:
  https://zappysys.com/blog/jsonpath-examples-expression-cheetsheet  
*/'
EXEC (@MyQuery) AT [LS_TO_POWER_BI_IN_GATEWAY]