How are object serialized with nodejs functions. Microsoft Azure > Azure Functions. An introduction to Azure Functions.; 4 minutes to read. Node.js, Java, or PHP. Pay only for the time your code runs and trust Azure to scale as needed. Azure Functions lets you develop serverless applications on Microsoft Azure. This topic provides a high-level overview of Azure Functions.
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Active6 years ago
- The serialize() method creates a URL encoded text string by serializing form values. You can select one or more form elements (like input and/or text area), or the form element itself. The serialized values can be used in the URL query string when making an AJAX request.
- I am storing the PHP $_SESSION data in a database. Then from a Node.js server I want to take that data and unserialize it. I tried to use js-php-unserialize like this: con.query('SELECT user_id.
Example:
Database table with 2 rows:
The serialize() converts a storable representation of a value. A serialize data means a sequence of bits so that it can be stored in a file, a memory buffer, or transmitted across a network connection link.
An inventory transaction to subtract 5 milk items needs to be executed using the oldest milk first.
e.g.
Node Js Php
Select rowid 1wait for its callback and in it Delete rowid 1 as its qty goes to 0 and is therefore spent
New deletion qty = 5 - 3 = 2. Since its not 0, another Select needs to be made.
Select rowid 2
wait for its callback and in it Update rowid 2 to set qty = 38.
The serialize capability in the sqlite binding will only serialize the two Selects. There's no way to know the second Select is even needed until the first Select and its callback are finished. It's only then that its realized that the first Select offered an insufficient qty.
How does one serialize the first Select and its callback using pure JavaScript - no JQuery or other libraries.
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Here's a pseudo code example:This is the smallest example I can think of to demo the issue.
Assume db is the result of a sqlite database open call which was successful.
The problem is that the while will execute continuously because nothing within its scope changes the value of deletionQty.Only the callback modifies it and since these are async events, the while loop will execute, say 100 times before thecallback changes the value of deletionQty. If there were a 1 to 1 relationship (a synchronous relationship) so that onlyone db.get is executed and then its callback is executed before the next while loop cycle, everything would work fine.It's the async delayed callback that allows the while to execute continuously setting up new callbacks that's the issue.
Bill Gradwohl
Bill GradwohlBill Gradwohl
1 Answer
I've recently created a simple abstraction named WaitFor to call async functions in sync mode (based on Fibers): https://github.com/luciotato/waitfor
your code with wait.for:
WiredPrairie's comment it's the most accurate. You can't turn off async in Node. It's fundamental to Node. You need a lib like wait.for(based on node-fibers), or 'async' or promises (Q) to code sequential logic.
DB sequential logic it's not what's node is made for.
check this answer also:Callback hell in nodejs?
Beyond all this, maybe you need to have a table with: product_id, qyt_in_stockand increment or decrement this field instead of deleting and inserting rows.
Community♦
Lucio M. TatoLucio M. Tato
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Not the answer you're looking for? Browse other questions tagged javascriptnode.jsserializationsqlite or ask your own question.
Active6 years ago
Example:
Database table with 2 rows:
Js Serialize Object
An inventory transaction to subtract 5 milk items needs to be executed using the oldest milk first.
Php Serialize Array
e.g.
Select rowid 1wait for its callback and in it Delete rowid 1 as its qty goes to 0 and is therefore spent
New deletion qty = 5 - 3 = 2. Since its not 0, another Select needs to be made.
Node Js Php Serialize Functions
Select rowid 2
wait for its callback and in it Update rowid 2 to set qty = 38.
The serialize capability in the sqlite binding will only serialize the two Selects. There's no way to know the second Select is even needed until the first Select and its callback are finished. It's only then that its realized that the first Select offered an insufficient qty.
How does one serialize the first Select and its callback using pure JavaScript - no JQuery or other libraries.
Js Serialize Form
Here's a pseudo code example:This is the smallest example I can think of to demo the issue.
Assume db is the result of a sqlite database open call which was successful.
The problem is that the while will execute continuously because nothing within its scope changes the value of deletionQty.Only the callback modifies it and since these are async events, the while loop will execute, say 100 times before thecallback changes the value of deletionQty. If there were a 1 to 1 relationship (a synchronous relationship) so that onlyone db.get is executed and then its callback is executed before the next while loop cycle, everything would work fine.It's the async delayed callback that allows the while to execute continuously setting up new callbacks that's the issue.
Node Js Php Serialize Function In Php
Bill Gradwohl
Bill GradwohlBill Gradwohl
1 Answer
I've recently created a simple abstraction named WaitFor to call async functions in sync mode (based on Fibers): https://github.com/luciotato/waitfor
your code with wait.for:
WiredPrairie's comment it's the most accurate. You can't turn off async in Node. It's fundamental to Node. You need a lib like wait.for(based on node-fibers), or 'async' or promises (Q) to code sequential logic.
DB sequential logic it's not what's node is made for.
check this answer also:Callback hell in nodejs?
Beyond all this, maybe you need to have a table with: product_id, qyt_in_stockand increment or decrement this field instead of deleting and inserting rows.
Community♦
Lucio M. TatoLucio M. Tato
Got a question that you can’t ask on public Stack Overflow? Learn more about sharing private information with Stack Overflow for Teams.