func (self *KcDb) Iter(fun func(string, Getter) bool) {
cur := C.kcdbcursor(self.cdb)
C.kccurjump(cur)
var kSize, vSize C.size_t
var vBuff, kBuff *C.char
var ret bool
for {
kBuff = C.kccurget(cur, &kSize, &vBuff, &vSize, kcTrue)
if kBuff == nil {
C.kcfree(unsafe.Pointer(kBuff))
break
}
key := string(C.GoBytes(unsafe.Pointer(kBuff), C.int(kSize)))
value := C.GoBytes(unsafe.Pointer(vBuff), C.int(vSize))
r := bytes.NewReader(value)
ret = fun(key, func(e interface{}) error {
return decode(r, e)
})
C.kcfree(unsafe.Pointer(kBuff))
if ret == false {
break
}
}
C.kccurdel(cur)
}
// Applies a function to all records in the database
//
// The function is called with the key and the value as parameters.
// All extra arguments passed to Apply are used in the call to f
func (d *DB) Apply(f ApplyFunc, args ...interface{}) {
cur := C.kcdbcursor(d.db)
defer C.kccurdel(cur)
C.kccurjump(cur)
for key, value := next(cur); value != ""; key, value = next(cur) {
f(key, value, args...)
}
}
func (kc *KCDB) Cursor() (kcc *KCCUR) {
cur := C.kcdbcursor(kc.db)
if cur == nil {
return nil
}
kcc = &KCCUR{cur}
kcc.Jump()
return
}
// Similar to Apply, but asynchronous. Returns a Waiter object, so
// you can wait for the applying to finish
func (d *DB) AsyncApply(f ApplyFunc, args ...interface{}) Waiter {
r := NewApplyResult()
cur := C.kcdbcursor(d.db)
defer C.kccurdel(cur)
C.kccurjump(cur)
for key, value := next(cur); value != ""; key, value = next(cur) {
r.wg.Add(1)
k, v := key, value
go func() {
f(k, v, args...)
r.wg.Done()
}()
}
return r
}
// Applies a function to all records in the database
//
// The function is called with the key and the value as parameters.
// All extra arguments passed to Apply are used in the call to f
func (d *DB) Apply(f ApplyFunc, args ...interface{}) {
var keyLen, valueLen C.size_t
var valueBuffer *C.char
defer C.free(unsafe.Pointer(valueBuffer))
cur := C.kcdbcursor(d.db)
defer C.kccurdel(cur)
C.kccurjump(cur)
var next = func() *C.char {
return C.kccurget(cur, &keyLen, &valueBuffer, &valueLen, 1)
}
for keyBuffer := next(); keyBuffer != nil; keyBuffer = next() {
key := C.GoString(keyBuffer)
C.free(unsafe.Pointer(keyBuffer))
value := C.GoString(valueBuffer)
f(key, value, args...)
}
}