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The BASIC+ logic that generates a resolved list looks something like this:
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SELECT "FILENAME" BY "FIELD1" SETTING 0 ELSE CALL MSG(@window, "Select failed with status ":STATUS()) RETURN 0 END * resolved list now available * (no BFS access required) DONE = 0 LOOP READNEXT @ID ELSE DONE = 1 UNTIL DONE DO (etc.) REPEAT |
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In order to resolve the select list, the special SELECT processor must examine each record in the file (or index). As a result, SELECT ... BY generates a series of filing system calls. In effect, the single BASIC+ SELECT statement compresses an entire SELECT ... READNEXT ... READ loop into a single statement, examining each record in the file.
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