What’s CodeFluent Query Language?

CodeFluent Query Language (a.k.a. CFQL) allows you to write platform independent data accessing queries which producers (producer = code generator) will translate into optimized stored procedures.

For instance you can define the following CFQL query in your model:

<cf:method name="LoadByName" body="load(Name) where Name startswith @Name"/> 

The SQL Server Producer will generate the following stored procedure:

CREATE PROCEDURE [dbo].[Test_LoadByName] 
( 
@Name [nvarchar] (256) 
) 
AS 
SET NOCOUNT ON 
SELECT DISTINCT [Test].[Test_Id], [Test].[Test_Name] 
    FROM [Test] 
    WHERE ([Test].[Test_Name] LIKE (@Name + '%'))

RETURN

And the Oracle Database Producer will generate the following equivalent:

PROCEDURE LoadByName(CF_CURSOR OUT "Sample"."CF_#Runtime".CF_CURSOR_TYPE, 
        "#Name" NVARCHAR2) AS 
    V_CF_CURSOR "Sample"."CF_#Runtime".CF_CURSOR_TYPE; 
    BEGIN 
        OPEN V_CF_CURSOR FOR 
        SELECT "Test"."Test_Id", "Test"."Test_Name" 
            FROM "Sample"."Test" 
            WHERE ("Test"."Test_Name" LIKE ("#Name" || N'%')); 
    CF_CURSOR := V_CF_CURSOR; 
    END;

As you can see data accessing queries are not built in-memory dynamically at run time but instead a classic stored procedure is generated at development time.

As a consequence developers can:

• see what’s going to happen at run time and avoid bad surprises (like this one when using EF for instance),
• debug it easily if they need to,
• change the code if the need to.

 

Cheers,
Carl Anderson