我有一个自定义同步过程,我将所有同步记录按顺序排队。当我的服务检索超过 1 个同步记录时,它将对其进行处理,然后更新每个成功记录的上次同步日期,或者在失败时记录我的错误(不更新上次同步日期)并中止同步过程。
我已经从 AngularJS 实现了 $q.all。这是同步循环的一个子集:
var processes = [];
for (var i in data) {
if (data[i] === null || data[i].TableName == null || data[i].Query == null || data[i].Params == null) {
// Let's throw an error here...
throw new TypeError("ERROR! The data retrieved from the download sync process was of an unexpected type.");
}
var params = data[i].Params;
var paramsMassaged = params.replaceAll("[", "").replaceAll("]", "").replaceAll(", ", ",").replaceAll("'", "");
var paramsArray = paramsMassaged.split(",");
mlog.Log("Query: " + data[i].Query);
mlog.Log("Params: " + paramsArray);
if (data[i].TableName === "table1") {
var process = $table1_DBContext.ExecuteSyncItem(data[i].Query, paramsArray);
process.then(
function () {
$DBConfigurations_DBContext.UpdateLastSyncDate(data[i].CreatedDate, function (response) {
mlog.Log(response);
});
},
function (response) {
mlog.LogSync("Error syncing record: " + response, "ERROR", data[i].Id);
},
null
);
processes.push(process);
} else if (data[i].TableName === "table2") {
var process = $table2_DBContext.ExecuteSyncItem(data[i].Query, paramsArray);
process.then(
function () {
$DBConfigurations_DBContext.UpdateLastSyncDate(data[i].CreatedDate, function (response) {
mlog.Log(response);
});
},
function (response) {
mlog.LogSync("Error syncing record: " + response, "ERROR", data[i].Id);
},
null
);
processes.push(process);
} else {
mlog.LogSync("WARNING! This table is not included in the sync process. You have an outdated version of the application. Table: " + data[i].TableName);
}
}
$q.all(processes)
.then(function (result) {
mlog.LogSync("---Finished syncing all records");
}, function (response) {
mlog.LogSync("Sync Failure - " + response, "ERROR");
});
ExecuteSyncItem 函数示例:
ExecuteSyncItem: function (script, params) {
window.logger.logIt("In the table1 ExecuteSyncItem function...");
var primaryKey = params[params.length - 1];
var deferred = $q.defer();
$DBService.ExecuteQuery(script, params,
function (insertId, rowsAffected, rows) {
window.logger.logIt("rowsAffected: " + rowsAffected.rowsAffected);
if (rowsAffected.rowsAffected <= 1) {
deferred.resolve();
} else {
deferred.resolve(errorMessage);
}
},
function (tx, error) {
deferred.reject("Failed to sync table1 record with primary key: " + primaryKey + "; Error: " + error.message);
}
);
return deferred.promise;
}
我遇到的问题是,如果有超过 1 个同步记录失败,则此行会为所有失败记录显示相同的值(不确定这是第一个失败记录还是最后一个)。
mlog.LogSync("Error syncing record: " + response, "ERROR", data[i].Id);
如何让它显示失败的特定记录的信息,而不是显示“x”次相同的消息?
最佳答案
正如comradburk
所提到的,将进程包装在循环内的闭包中是一个很好的解决方案,但是有一种 Angular
方法可以解决这个问题。您可以通过 angular.forEach()
并循环遍历所有 data
元素,而不是使用 native for-in
循环。
var processes = [];
angular.forEach(data, function(item) {
if (item === null || item.TableName == null || item.Query == null || item.Params == null) {
// Let's throw an error here...
throw new TypeError("ERROR! The data retrieved from the download sync process was of an unexpected type.");
}
var params = item.Params;
var paramsMassaged = params.replaceAll("[", "").replaceAll("]", "").replaceAll(", ", ",").replaceAll("'", "");
var paramsArray = paramsMassaged.split(",");
mlog.Log("Query: " + item.Query);
mlog.Log("Params: " + paramsArray);
if (item.TableName === "table1") {
var process = $table1_DBContext.ExecuteSyncItem(item.Query, paramsArray);
process.then(
function () {
$DBConfigurations_DBContext.UpdateLastSyncDate(item.CreatedDate, function (response) {
mlog.Log(response);
});
},
function (response) {
mlog.LogSync("Error syncing record: " + response, "ERROR", item.Id);
},
null
);
processes.push(process);
} else if (item.TableName === "table2") {
var process = $table2_DBContext.ExecuteSyncItem(item.Query, paramsArray);
process.then(
function () {
$DBConfigurations_DBContext.UpdateLastSyncDate(item.CreatedDate, function (response) {
mlog.Log(response);
});
},
function (response) {
mlog.LogSync("Error syncing record: " + response, "ERROR", item.Id);
},
null
);
processes.push(process);
} else {
mlog.LogSync("WARNING! This table is not included in the sync process. You have an outdated version of the application. Table: " + item.TableName);
}
});
$q.all(processes)
.then(function (result) {
mlog.LogSync("---Finished syncing all records");
}, function (response) {
mlog.LogSync("Sync Failure - " + response, "ERROR");
});
关于javascript - Angular 延迟实现仅输出循环的最后一个值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24459290/