假设我想编写一个DAG来显示Redshift特定模式中的所有表。
1. InputStream.InputStream();
2. InputStream.methodOne();
3. InputStream.methodTwo();
4. InputStream.methodThree();
查询为 private val bleScanner = object :ScanCallback() {
override fun onScanResult(callbackType: Int, result: ScanResult?) {
super.onScanResult(callbackType, result)
Log.d("DeviceListActivity","onScanResult: ${result?.device?.address} - ${result?.device?.name}")
}
override fun onBatchScanResults(results: MutableList<ScanResult>?) {
super.onBatchScanResults(results)
Log.d("DeviceListActivity","onBatchScanResults:${results.toString()}")
}
override fun onScanFailed(errorCode: Int) {
super.onScanFailed(errorCode)
Log.d("DeviceListActivity", "onScanFailed: $errorCode")
}
}
private val bluetoothLeScanner: BluetoothLeScanner
get() {
val bluetoothManager = applicationContext.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
val bluetoothAdapter = bluetoothManager.adapter
return bluetoothAdapter.bluetoothLeScanner
}
class ListDevicesAdapter(context: Context?, resource: Int) : ArrayAdapter<String>(context, resource)
override fun onCreate(savedInstanceState: Bundle?) {
Log.d("DeviceListActivity", "onCreate()")
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_device_list)
}
override fun onStart() {
Log.d("DeviceListActivity","onStart()")
super.onStart()
bluetoothLeScanner.startScan(bleScanner)
}
override fun onStop() {
bluetoothLeScanner.stopScan(bleScanner)
super.onStop()
}
如何为它创建DAG？ 我认为这应该是这样的：
SQL有谁知道怎么写得正确吗？