A nostalgic visit from the past: Embedded SQL, where you can inject live SQL directly into your C code.

EMBEDDED SQL IN C
Introduction to Pro*C

The second refers to such development using Oracle. Example from the second:

for (;;) {
    printf("Give student id number : ");
    scanf("%d", &id);
    EXEC SQL WHENEVER NOT FOUND GOTO notfound;
    EXEC SQL SELECT studentname INTO :st_name
             FROM   student
             WHERE  studentid = :id;
    printf("Name of student is %s.\n", st_name);
    continue;
notfound:
    printf("No record exists for id %d!\n", id);
}

It’s worth mentioning just to have some central place to search for it later.