dart - indexed_db-objectstore.delete-onSuccess

Question

有人可以告诉我下面的代码怎么了。主要问题是该行:

fDbListAllClients;    // this is not being "called"

似乎没有执行。

也可能有其他错误代码。我不担心是否需要检查删除，我想知道是什么原因导致未执行相关行的问题。

fDbDeleteOneClient(String sKey) {
  var oDbTxn      =  ogDb1.transaction(sgTblClient, 'readwrite');
  var oDbTable    =  oDbTxn.objectStore(sgTblClient);
  var oDbRecord   =   oDbTable.getObject(sKey);
  oDbRecord.onSuccess.first.then((val) {if (oDbRecord.result == null) {
    window.alert("Record $sKey not found and cannot be deleted");
    return;}});
  var oDbDelReq   =  oDbTable.delete(sKey);
  oDbDelReq.onSuccess.first.then((val1) {
    var oDbRecord   =   oDbTable.getObject(sKey);  // check if it was deleted
    oDbRecord.onSuccess.first.then((val2){
      if (oDbRecord.result != null) {
        window.alert("Record $sKey was found but cannot be deleted");
      }
    });
    fDbListAllClients;    // this is not being "called"
  });  
  oDbDelReq.onError.first.then((e) => window.alert(
    "Error on Delete of $sKey. Error = ${e}"));
}

Answer 1

问题或主要问题的一部分是需要使用onSuccess.listen()。当有人回答另一个问题时:

“onSuccess是一个流。如果您想接收多个元素，只需为其“监听”:onSuccess.listen。”