fetch

问题 I would like to know how to fetch multiple GET URLs at once and then put the fetched JSON data into my React DOM element. Here is my code: fetch("http://localhost:3000/items/get") .then(function(response){ response.json().then( function(data){ ReactDOM.render( <Test items={data}/>, document.getElementById('overview') );} ); }) .catch(function(err){console.log(err);}); However, I would like to fetch additional JSON datas from my server and then render my ReactDOM with all these JSON datas

问题 I am trying to understand how the following builtin functions work when sequentially processing cursor rows. The descriptions come from the Python 3.1 manual (using SQLite3) Cursor.fetchone() Fetches the next row of a query result set, returning a single sequence. Cursor.fetchmany() Fetches the next set of rows of a query result, returning a list. Cursor.fetchall() Fetches all (remaining) rows of a query result, returning a list. So if I have a loop in which I am processing one row at a time

问题 What is the better way of getting the IP address in PHP: getenv('REMOTE_ADDR'); or, $_SERVER['REMOTE_ADDR']; please tell me the difference, if any, between the two. 回答1: getenv() can be used to access any environment variables (PHP simply registers REMOTE_ADDR as an environment variable for the script), while with $_SERVER you obviously only access the contents of the $_SERVER superglobal. The common approach is to use $_SERVER for this, although it doesn't really make a difference

问题 What is the better way of getting the IP address in PHP: getenv('REMOTE_ADDR'); or, $_SERVER['REMOTE_ADDR']; please tell me the difference, if any, between the two. 回答1: getenv() can be used to access any environment variables (PHP simply registers REMOTE_ADDR as an environment variable for the script), while with $_SERVER you obviously only access the contents of the $_SERVER superglobal. The common approach is to use $_SERVER for this, although it doesn't really make a difference

问题 I have a problem checking whether a particular attribute of an Entity exists in the Core Data Database (through predicates) before creating a new object; if the object exists, I'd rather return it than create a new object. I have a simple App which has a table view with a plus button in the Navigation Bar; the user clicks that and is presented with a View Controller with 4 text fields. They fill in that information, press save and it gets saved to Core Data and displayed in the TableView

问题 Below is some poorly written and heavily misunderstood PHP code with no error checking. To be honest, I'm struggling a little getting my head around the maze of PHP->MySQLi functions! Could someone please provide an example of how one would use prepared statements to collect results in an associative array whilst also getting a row count from $stmt? The code below is what I'm playing around with. I think the bit that's throwing me off is using $stmt values after store_result and then trying

问题 I am unable to get Safari to successfully apply Set-Cookie from server responses when using the Fetch API (actually, via the fetch polyfill). The same code works correctly in FF and Chrome (I tested using both native and polyfill fetch ). The request is across domains; yes, I am setting credentials: true ; the server does respond with a Set-Cookie header; subsequent requests are sent from Chrome and FF with cookie request headers, but Safari does not; the request uses HTTPS (the cert is self

问题 I'm trying to do a GET request on wikipedia API. Using jQuery as below works fine: $.ajax({ url: 'https://en.wikipedia.org/w/api.php?format=json&action=query&generator=search&gsrnamespace=0&gsrlimit=10&prop=pageimages|extracts&pilimit=max&exintro&explaintext&exsentences=1&exlimit=max&gsrsearch=Test&callback=JSON_CALLBACK', type: 'GET', headers: {'X-Requested-With': 'XMLHttpRequest'}, crossDomain: true, dataType: 'jsonp' }).done(function(data) { console.log("Data: ", data); }); But I want to

问题 I have an app, which im using fetch to authenticate user. it was working till few days ago and i haven't change anything. just upgraded from react 0.27 to 0.28, not fetch is not working. i have searched for almost 2 days and i have read almost all questions in stackoverflow. most of users trying to fetch something from localhost, and when they change it to actual ip address , they get it to work. but im not fetching anything from localhost, also mine code used to be working. here is my code :

问题 This does not work: $dbh = new PDO("dblib:host=xxxx;dbname=xxx", "xxxxx", "xxxxx"); $sth = $dbh->prepare("{exec wcweb_UserInfo(?)}"); $sth->bindParam(1, $name); $sth->execute(); while($result = $sth->fetch(PDO::FETCH_ASSOC)) { var_dump($result); } This also does not work: $dbh = new PDO("dblib:host=xxxxx;dbname=xxxx", "xxxxx", "xxxx"); $sth = $dbh->prepare("{call wcweb_UserInfo(?)}"); $sth->bindParam(1, $name); $sth->execute(); while($result = $sth->fetch(PDO::FETCH_ASSOC)) { var_dump($result