我有一个在需要插入mongodb数据库的for循环数据中运行的方法。
在插入之前我需要查询数据库以查看是否存在类似的记录，以便我可以给它相同的代码，我需要找到记录的最大代码并给插入的方法下一个最高的代码
我需要的输出是Code，0,2，插入第一个记录然后Code，1,2，insert但我收到的输出是代码，0代码，0代码，0代码，0 2,2,2 ，2告诉我每个动作在循环中一个接一个地运行，而不是按照我需要的顺序运行
//First Promise
const BatchCheckPromise = new Promise((resolve) => {
const Code = "";
var query = {
BatchCode: {
$eq: Row.BatchCode
}
}
//Mongo Database Query To Get Code From The Batch
var BatchRow = db.collection("ap_transaction_line").find(query).toArray();
BatchRow.then(function(db_data){
console.log("Code");
console.log(db_data.length);
//Get code if in database
if (db_data.length > 0) {
Code = db_data[0].Code;
}
resolve(Code)
});
});
//Second Promise
async function MaxCheckPromise(Code) {
return new Promise(
(resolve, reject) => {
//If code is still null after checking the database
if (Code == "" || Code == null) {
var Code = "";
var query = {
Prefix: {
$eq: Row.Prefix
}
}
var sort = {
Code: -1
};
//Mongo Database query for max code in the database
var MaxRow = db.collection("ap_transaction_line").find(query).sort(sort).limit(1).toArray();
MaxRow.then(function(db_data){
Code = db_data[0].Code;
Code++;
//Increment by 1 for new code
resolve(Code);
/////////
});
}
else {
resolve(Code);
}
}
)
}
//Insert function
async function InsertInToDataBase() {
try {
//first promise to query the batchcode
let BatchCode = await BatchCheckPromise;
//second promise to query the max code if no batchcode
let MaxCode = await MaxCheckPromise(BatchCode);
console.log(MaxCode);
//Insert into Database with new Code
if (Row.TimeStamp == "U") {
//vars
//db query
var db_collection = "ap_transaction_line";
var db_query = {
LocalID: Row.LocalID
};
var db_data = {
TimeStamp: Row.TimeStamp,
Error: Row.Error,
SyncID: Row.SyncID,
DateCreated: Row.DateCreated,
BatchCode: Row.BatchCode,
TransCode: Row.TransCode,
ConsCode: Row.ConsCode,
DebitCode: Row.DebitCode,
Prefix: Row.Prefix,
Code: MaxCode,
ToAcc: Row.ToAcc,
FromAcc: Row.FromAcc,
Vendor_Client: Row.Vendor_Client,
Date: Row.Date,
Description: Row.Description,
Qty_Calls: Row.Qty_Calls,
Price_Rate: Row.Price_Rate,
TotalEX: Row.TotalEX,
Ref: Row.Ref,
Detail: Row.Detail,
Username: Row.Username,
PaidStatus: Row.PaidStatus,
Period: Row.Period,
PeriodAuth: Row.PeriodAuth,
BankRecon: Row.BankRecon,
PDFName: Row.PDFName,
Auth: Row.Auth,
InvItem: Row.InvItem,
InvPicName: Row.InvPicName,
EpsNum: Row.EpsNum,
BatchGroup: Row.BatchGroup
};
m_connect("updateOne", DbName.DBname, db_collection, db_query, "", db_data, "", function (db_connect) {
//console.log('db_connect');
//console.log(db_connect);
});
} else if (Row.TimeStamp == "") {
//db query
var db_collection = "ap_transaction_line";
var db_query = {
SyncID: Row.SyncID
};
var db_data = {
TimeStamp: Row.TimeStamp,
Error: Row.Error,
SyncID: Row.SyncID,
DateCreated: Row.DateCreated,
BatchCode: Row.BatchCode,
TransCode: Row.TransCode,
ConsCode: Row.ConsCode,
DebitCode: Row.DebitCode,
Prefix: Row.Prefix,
Code: MaxCode,
ToAcc: Row.ToAcc,
FromAcc: Row.FromAcc,
Vendor_Client: Row.Vendor_Client,
Date: Row.Date,
Description: Row.Description,
Qty_Calls: Row.Qty_Calls,
Price_Rate: Row.Price_Rate,
TotalEX: Row.TotalEX,
Ref: Row.Ref,
Detail: Row.Detail,
Username: Row.Username,
PaidStatus: Row.PaidStatus,
Period: Row.Period,
PeriodAuth: Row.PeriodAuth,
BankRecon: Row.BankRecon,
PDFName: Row.PDFName,
Auth: Row.Auth,
InvItem: Row.InvItem,
InvPicName: Row.InvPicName,
EpsNum: Row.EpsNum,
BatchGroup: Row.BatchGroup
};
//m_connect("queryAll", db_collection, "", "", function(db_connect){
m_connect("insertone", DbName.DBname, db_collection, db_query, "", db_data, "", function (db_connect) {
//console.log('db_connect');
//console.log(db_connect);
console.log("Insert");
});
}
}
catch (error) {
console.log(error.message);
}
}
//Run the functions async
(async () => {
await InsertInToDataBase();
})();
答案 0 :(得分：0)
我建议你依靠像Axios这样的库来管理带有promises的ajax调用，因为它增加了很好的功能，比如串行调用（你需要的那个）和并行调用。