Abstract: The solution concerns the access to a number of data files stored in the memory of a data processing device. The device includes a privilege file (P1-P3) associated with a user type (ADM, PUBLIC, USER1, USER2), the privilege file identifying for at least one command (SEL, INS, UPD, SUP) the data files on which the command can be executed. A microcontroller is programmed to create, when a user accesses the data files, a set of flags from the privilege file, each flag being associated with a unique data file, the flag indicating whether or not the command can be executed on the associated file.

Abstract: The solution concerns a method to query a relational database stored on a computer comprising a microcontroller, said database comprising at least a table composed of columns and rows including data accessible via a cursor. The method includes the following steps: Before executing the cursor, declare a cursor by systematically selecting all columns in the table concerned by the cursor, execute the cursor, after execution, select columns using a SEARCH command capable of selecting columns in the cursor result.

Abstract: The solution concerns the access to a number of data files stored in the memory of a data processing device. The device includes a privilege file (P1-P3) associated with a user type (ADM, PUBLIC, USER1, USER2), said privilege file identifying for at least one command (SEL, INS, UPD, SUP) the data files on which said command can be executed. A microcontroller is programmed to create, when a user accesses the data files, a set of flags from the privilege file, each flag being associated with a unique data file, the flag indicating whether or not the command can be executed on the associated file.