Golang unqlite_kv_fetch Examples

Example #1

File: unqlite.go Project: cjl3080434008/redis-land-go

// Fetch ...
func (db *Database) Fetch(key []byte) (value []byte, err error) {
	var n C.unqlite_int64
	res := C.unqlite_kv_fetch(db.handle, unsafe.Pointer(&key[0]), C.int(len(key)), nil, &n)
	if res != C.UNQLITE_OK {
		err = UnQLiteError(res)
		return
	}
	value = make([]byte, int(n))
	res = C.unqlite_kv_fetch(db.handle, unsafe.Pointer(&key[0]), C.int(len(key)), unsafe.Pointer(&value[0]), &n)
	if res != C.UNQLITE_OK {
		err = UnQLiteError(res)
	}
	return
}

Example #2

File: unqlite.go Project: LonelyPale/go-unqlite

// KvFetch a record from the database
// See: http://unqlite.org/c_api/unqlite_kv_fetch.html
func (u *Unqlite) KvFetch(key []byte) ([]byte, error) {
	var n C.unqlite_int64

	if rc := C.unqlite_kv_fetch(u.db, unsafe.Pointer(&key[0]), C.int(len(key)), nil, &n); rc != C.UNQLITE_OK {
		return nil, ErrCode(rc)
	}

	buf := make([]byte, int64(n))
	if rc := C.unqlite_kv_fetch(u.db, unsafe.Pointer(&key[0]), C.int(len(key)), unsafe.Pointer(&buf[0]), &n); rc != C.UNQLITE_OK {
		return nil, ErrCode(rc)
	}

	return buf, nil
}

Example #3

File: gounqlite.go Project: LonelyPale/gounqlite

// Fetch retrieves the value for the specified key from the database.
func (h *Handle) Fetch(key []byte) (value []byte, err error) {
	// Fetch size of value.
	var n C.unqlite_int64
	rv := C.unqlite_kv_fetch(h.db, unsafe.Pointer(&key[0]), C.int(len(key)), nil, &n)
	if rv != C.UNQLITE_OK {
		return nil, Errno(rv)
	}
	// Fetch value.
	b := make([]byte, int(n))
	rv = C.unqlite_kv_fetch(h.db, unsafe.Pointer(&key[0]), C.int(len(key)), unsafe.Pointer(&b[0]), &n)
	if rv != C.UNQLITE_OK {
		return nil, Errno(rv)
	}
	return b, nil
}

Example #4

File: unqlite.go Project: LonelyPale/unqlite-2

func (u *Unqlite) KvFetch(key, value []byte) ([]byte, error) {
	outlen := C.unqlite_int64(len(value))
	e := C.unqlite_kv_fetch(u.db, unsafe.Pointer(&key[0]), C.int(len(key)), unsafe.Pointer(&value[0]), &outlen)
	err := code2Error(e)
	n := int(outlen)
	if n <= 0 {
		return nil, err
	}
	return value[:n], err
}