Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Here is the code that I am using to detect circular references, it uses the technique that was suggested in the <a href="https://stackoverflow.com/a/7583161/592253">accepted answer by asbjornu</a>, whereby each value is walked through and its reference is maintained in an array so that the next value can be compared with those previously walked.</p> <pre><code>function isCircular(obj, arr) { "use strict"; var type = typeof obj, propName, //keys, thisVal, //iterKeys, iterArr, lastArr; if (type !== "object" &amp;&amp; type !== "function") { return false; } if (Object.prototype.toString.call(arr) !== '[object Array]') { //if (!Array.isArray(arr)) { type = typeof arr; // jslint sake if (!(type === "undefined" || arr === null)) { throw new TypeError("Expected attribute to be an array"); } arr = []; } arr.push(obj); lastArr = arr.length - 1; for (propName in obj) { //keys = Object.keys(obj); //propName = keys[iterKeys]; //for (iterKeys = keys.length - 1; iterKeys &gt;= 0; iterKeys -= 1) { thisVal = obj[propName]; //thisVal = obj[keys[iterKeys]]; type = typeof thisVal; if (type === "object" || type === "function") { for (iterArr = lastArr; iterArr &gt;= 0; iterArr -= 1) { if (thisVal === arr[iterArr]) { return true; } } // alternative to the above for loop /* if (arr.indexOf(obj[propName]) &gt;= 0) { return true; } */ if (isCircular(thisVal, arr)) { return true; } } } arr.pop(); return false; } </code></pre> <p>This code is available on <a href="http://jsfiddle.net/Xotic750/sgPWX/22/" rel="nofollow noreferrer">jsfiddle</a>, where you can test it for yourself. I have also run some performance tests on <a href="http://jsperf.com/iscircularobject-vs-iscircular-vs-iscirculares5/3" rel="nofollow noreferrer">jsperf</a>.</p> <p><code>Array.indexOf</code> was only introduced as of Javascript 1.6, see <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/indexOf" rel="nofollow noreferrer">MDN page</a></p> <p><code>Array.isArray</code> was only introduced as of Javascript 1.8.5, see <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/isArray" rel="nofollow noreferrer">MDN page</a></p> <p><code>Object.keys</code> was only introduced as of Javascript 1.8.5, see <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/keys" rel="nofollow noreferrer">MDN page</a></p> <p>It is also worth noting that <em><a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Functions_and_function_scope/arguments/callee" rel="nofollow noreferrer"><code>arguments.callee</code></a></em> is deprecated and forbidden in strict mode in preference to using named functions</p>
    singulars
    1. This table or related slice is empty.
    1. POIs there a way to test circular reference in JavaScript?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USXotic750
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload