func (kc *KCDB) IncrInt(key []byte, amount int64) (result int64, err error) {
ckey := (*C.char)(unsafe.Pointer(&key[0]))
cresult := C.kcdbincrint(kc.db, ckey, C.size_t(len(key)), C.int64_t(amount), 0.0)
if cresult == C.INT64_MIN {
err = kc.error()
} else {
result = int64(cresult)
}
return
}
// Increments the value of a numeric record by a given number,
// and return the incremented value
//
// In case of errors, returns 0 and a KCError instance with detailed
// error message
func (d *DB) Increment(key string, number int) (int, error) {
cKey := C.CString(key)
defer C.free(unsafe.Pointer(cKey))
lKey := C.size_t(len(key))
cValue := C.int64_t(number)
v := C.kcdbincrint(d.db, cKey, lKey, cValue, 0)
if v == C.INT64_MIN {
return 0, KCError("It's not possible to increment a non-numeric record")
}
return int(v), nil
}
// GetInt gets a numeric record from the database.
//
// In case of errors (e.g.: when the given key refers to a non-numeric record),
// returns 0 and a KCError instance.
func (d *DB) GetInt(key string) (int, error) {
v, err := d.Get(key)
if err != nil {
return 0, err
} else if strings.IndexRune(v, '\x00') != 0 {
return 0, KCError("Error: GetInt can't be used to get a non-numeric record")
}
cKey := C.CString(key)
defer C.free(unsafe.Pointer(cKey))
lKey := C.size_t(len(key))
number := C.kcdbincrint(d.db, cKey, lKey, 0, 0)
return int(number), nil
}
// Gets a numeric record from the database
//
// In case of errors (e.g.: when the given key refers to a non-numeric record),
// returns 0 and a KCError instance.
func (d *DB) GetInt(key string) (int, error) {
v, err := d.Get(key)
if err != nil {
return 0, err
} else if v != "" {
err := KCError("Error: don't use GetInt to get a non-numeric record")
return 0, err
}
cKey := C.CString(key)
defer C.free(unsafe.Pointer(cKey))
lKey := C.size_t(len(key))
number := C.kcdbincrint(d.db, cKey, lKey, 0, 0)
return int(number), nil
}
// Sets the value of an integer record, creating it when there is no
// record correspondent to the given key
//
// Returns an KCError in case of errors setting the value
func (d *DB) SetInt(key string, number int) error {
if d.mode < WRITE {
return KCError("SetInt doesn't work in read-only mode")
}
d.Remove(key)
cKey := C.CString(key)
defer C.free(unsafe.Pointer(cKey))
lKey := C.size_t(len(key))
cValue := C.int64_t(number)
if C.kcdbincrint(d.db, cKey, lKey, cValue, 0) == C.INT64_MIN {
errMsg := d.LastError()
return KCError(fmt.Sprintf("Error setting integer value: %s", errMsg))
}
return nil
}