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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Class: Query</title>
<script src="scripts/prettify/prettify.js"> </script>
<script src="scripts/prettify/lang-css.js"> </script>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
</head>
<body>
<div id="main">
<h1 class="page-title">Class: Query</h1>
<section>
<header>
<h2><span class="attribs"><span class="type-signature"></span></span>
<span class="ancestors"><a href="ClearBlade.html">ClearBlade</a>.</span>Query<span class="signature">(options)</span><span class="type-signature"> → {Object}</span></h2>
</header>
<article>
<div class="container-overview">
<h4 class="name" id="Query"><span class="type-signature"></span>new Query<span class="signature">(options)</span><span class="type-signature"> → {Object}</span></h4>
<div class="description">
creates and returns a Query object that can be used in Collection methods or on its own to operate on items on the server
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">Object that has configuration values used when instantiating a Query object</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="ClearBlade.js.html">ClearBlade.js</a>, <a href="ClearBlade.js.html#line975">line 975</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
Clearblade.Query the created query
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Object</span>
</dd>
</dl>
</div>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="columns"><span class="type-signature"></span>columns<span class="signature">(Columns, callback)</span><span class="type-signature"></span></h4>
<div class="description">
Gets rows of the specified columns
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>Columns</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">object</td>
</tr>
<tr>
<td class="name"><code>callback</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last">Function that handles the response of the server</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="ClearBlade.js.html">ClearBlade.js</a>, <a href="ClearBlade.js.html#line1275">line 1275</a>
</li></ul></dd>
</dl>
<h5>Example</h5>
<p class="code-caption">Getting values of columns</p>
<pre class="prettyprint"><code>//This example assumes a collection of items that have the columns name and age.
var query = ClearBlade.Query({'collectionName': 'COLLECTIONNAME'});
var callback = function (err, data) {
if (err) {
throw new Error (data);
} else {
console.log(data);
}
};
query.columns(["name","age"]);
query.fetch(callback);
//gets values in columns name and age</code></pre>
<h4 class="name" id="equalTo"><span class="type-signature"></span>equalTo<span class="signature">(field, value)</span><span class="type-signature"></span></h4>
<div class="description">
Creates an equality clause in the query object
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>field</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">String defining what attribute to compare</td>
</tr>
<tr>
<td class="name"><code>value</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">String or Number that is used to compare against</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="ClearBlade.js.html">ClearBlade.js</a>, <a href="ClearBlade.js.html#line1049">line 1049</a>
</li></ul></dd>
</dl>
<h5>Example</h5>
<p class="code-caption">Adding an equality clause to a query</p>
<pre class="prettyprint"><code>var query = ClearBlade.Query();
query.equalTo('name', 'John');
//will only match if an item has an attribute 'name' that is equal to 'John'</code></pre>
<h4 class="name" id="fetch"><span class="type-signature"></span>fetch<span class="signature">(callback)</span><span class="type-signature"> → {<a href="ClearBlade.Item.html">ClearBlade.Item</a>}</span></h4>
<div class="description">
Reqests an item or a set of items from the query. Requires that
the Query object was initialized with a collection.
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>callback</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="description last">Supplies processing for what to do with the data that is returned from the collection</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="ClearBlade.js.html">ClearBlade.js</a>, <a href="ClearBlade.js.html#line1195">line 1195</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
An array of ClearBlade Items
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="ClearBlade.Item.html">ClearBlade.Item</a></span>
</dd>
</dl>
<h5>Example</h5>
<p class="code-caption">The typical callback</p>
<pre class="prettyprint"><code>var query = ClearBlade.Query({'collection': 'COLLECTIONID'});
var callback = function (err, data) {
if (err) {
//error handling
} else {
console.log(data);
}
};
query.fetch(callback);</code></pre>
<h4 class="name" id="greaterThan"><span class="type-signature"></span>greaterThan<span class="signature">(field, value)</span><span class="type-signature"></span></h4>
<div class="description">
Creates a greater than clause in the query object
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>field</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">String defining what attribute to compare</td>
</tr>
<tr>
<td class="name"><code>value</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">String or Number that is used to compare against</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="ClearBlade.js.html">ClearBlade.js</a>, <a href="ClearBlade.js.html#line1064">line 1064</a>
</li></ul></dd>
</dl>
<h5>Example</h5>
<p class="code-caption">Adding a greater than clause to a query</p>
<pre class="prettyprint"><code>var query = ClearBlade.Query();
query.greaterThan('age', 21);
//will only match if an item has an attribute 'age' that is greater than 21</code></pre>
<h4 class="name" id="greaterThanEqualTo"><span class="type-signature"></span>greaterThanEqualTo<span class="signature">(field, value)</span><span class="type-signature"></span></h4>
<div class="description">
Creates a greater than or equality clause in the query object
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>field</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">String defining what attribute to compare</td>
</tr>
<tr>
<td class="name"><code>value</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="description last">String or Number that is used to compare against</td>
</tr>
</tbody>
</table>