Execute sql inside other modules

[Desarrollo C/C++]

Hi,    
    I'm writing a module on accounting section that write UserName and SessionTime in other table, and I need to run same sql statament inserts or select, but I don't understant how I can do it inside a module. 

Can any help me? 
I think that I need to use radius_xlat function, same body give me an example?

Thanks
Toto
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