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+            <!-- ! Licensed to the Apache Software Foundation (ASF) under one
+ ! or more contributor license agreements.  See the NOTICE file
+ ! distributed with this work for additional information
+ ! regarding copyright ownership.  The ASF licenses this file
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+ ! "License"); you may not use this file except in compliance
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+ !
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+ ! "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ ! KIND, either express or implied.  See the License for the
+ ! specific language governing permissions and limitations
+ ! under the License.
+ ! --><h1>HTTP API to AsterixDB</h1>
+<div class="section">
+<h2><a name="Table_of_Contents"></a><a name="toc" id="toc">Table of Contents</a></h2>
+
+<ul>
+  
+<li><a href="#DdlApi">DDL API</a></li>
+  
+<li><a href="#UpdateApi">Update API</a></li>
+  
+<li><a href="#QueryApi">Query API</a></li>
+  
+<li><a href="#AnyApi">Mixed API</a></li>
+  
+<li><a href="#AsynchronousResultApi">Asynchronous Result API</a></li>
+  
+<li><a href="#QueryStatusApi">Query Status API</a></li>
+  
+<li><a href="#ErrorCodes">Error Codes</a></li>
+</ul></div>
+<div class="section">
+<h2><a name="DDL_API_Back_to_TOC"></a><a name="DdlApi" id="DdlApi">DDL API</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p><i>End point for the data definition statements</i></p>
+<p>Endpoint: <i>/ddl</i></p>
+<p>Parameters:</p>
+
+<table border="0" class="table table-striped">
+
+<tr class="a">
+  
+<td>Parameter</td>
+  
+<td>Description</td>
+  
+<td>Required?</td>
+</tr>
+
+<tr class="b">
+  
+<td>ddl</td>
+  
+<td>String containing DDL statements to modify Metadata</td>
+  
+<td>Yes</td>
+</tr>
+</table>
+<p>This call does not return any result. If the operations were successful, HTTP OK status code is returned.</p>
+<div class="section">
+<h3><a name="Example"></a>Example</h3>
+<div class="section">
+<h4><a name="DDL_Statements"></a>DDL Statements</h4>
+
+<div class="source">
+<div class="source">
+<pre>    drop dataverse company if exists;
+    create dataverse company;
+    use dataverse company;
+
+    create type Emp as open {
+      id : int32,
+      name : string
+    };
+
+    create dataset Employee(Emp) primary key id;
+</pre></div></div>
+<p>API call for the above DDL statements in the URL-encoded form.</p>
+<p>[http://localhost:19002/ddl?ddl=drop%20dataverse%20company%20if%20exists;create%20dataverse%20company;use%20dataverse%20company;create%20type%20Emp%20as%20open%20{id%20:%20int32,name%20:%20string};create%20dataset%20Employee(Emp)%20primary%20key%20id;](<a class="externalLink" href="http://localhost:19002/ddl?ddl=drop%20dataverse%20company%20if%20exists;create%20dataverse%20company;use%20dataverse%20company;create%20type%20Emp%20as%20open%20{id%20:%20int32,name%20:%20string};create%20dataset%20Employee(Emp)%20primary%20key%20id;">http://localhost:19002/ddl?ddl=drop%20dataverse%20company%20if%20exists;create%20dataverse%20company;use%20dataverse%20company;create%20type%20Emp%20as%20open%20{id%20:%20int32,name%20:%20string};create%20dataset%20Employee(Emp)%20primary%20key%20id;</a>)</p></div>
+<div class="section">
+<h4><a name="Response"></a>Response</h4>
+<p><i>HTTP OK 200</i><br /><tt>&lt;NO PAYLOAD&gt;</tt></p></div></div></div>
+<div class="section">
+<h2><a name="Update_API_Back_to_TOC"></a><a name="UpdateApi" id="UpdateApi">Update API</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p><i>End point for update statements (INSERT, DELETE and LOAD)</i></p>
+<p>Endpoint: <i>/update</i></p>
+<p>Parameters:</p>
+
+<table border="0" class="table table-striped">
+
+<tr class="a">
+  
+<td>Parameter</td>
+  
+<td>Description</td>
+  
+<td>Required?</td>
+</tr>
+
+<tr class="b">
+  
+<td>statements</td>
+  
+<td>String containing update (insert/delete) statements to execute</td>
+  
+<td>Yes</td>
+</tr>
+</table>
+<p>This call does not return any result. If the operations were successful, HTTP OK status code is returned.</p>
+<div class="section">
+<h3><a name="Example"></a>Example</h3>
+<div class="section">
+<h4><a name="Update_Statements"></a>Update Statements</h4>
+
+<div class="source">
+<div class="source">
+<pre>    use dataverse company;
+
+    insert into dataset Employee({ &quot;id&quot;:123,&quot;name&quot;:&quot;John Doe&quot;});
+</pre></div></div>
+<p>API call for the above update statement in the URL-encoded form.</p>
+<p>[http://localhost:19002/update?statements=use%20dataverse%20company;insert%20into%20dataset%20Employee({%20%22id%22:123,%22name%22:%22John%20Doe%22});](<a class="externalLink" href="http://localhost:19002/update?statements=use%20dataverse%20company;insert%20into%20dataset%20Employee({%20%22id%22:123,%22name%22:%22John%20Doe%22});">http://localhost:19002/update?statements=use%20dataverse%20company;insert%20into%20dataset%20Employee({%20%22id%22:123,%22name%22:%22John%20Doe%22});</a>)</p></div>
+<div class="section">
+<h4><a name="Response"></a>Response</h4>
+<p><i>HTTP OK 200</i><br /><tt>&lt;NO PAYLOAD&gt;</tt></p></div></div></div>
+<div class="section">
+<h2><a name="Query_API_Back_to_TOC"></a><a name="QueryApi" id="QueryApi">Query API</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p><i>End point for query statements</i></p>
+<p>Endpoint: <i>/query</i></p>
+<p>Parameters:</p>
+
+<table border="0" class="table table-striped">
+
+<tr class="a">
+  
+<td>Parameter</td>
+  
+<td>Description</td>
+  
+<td>Required?</td>
+</tr>
+
+<tr class="b">
+  
+<td>query</td>
+  
+<td>Query string to pass to ASTERIX for execution</td>
+  
+<td>Yes</td>
+</tr>
+
+<tr class="a">
+  
+<td>mode</td>
+  
+<td>Indicate if call should be synchronous or asynchronous. mode = synchronous blocks the call until results are available; mode = asynchronous returns immediately with a handle that can be used later to check the query&#x2019;s status and to fetch results when available</td>
+  
+<td>No. default mode = synchronous</td>
+</tr>
+</table>
+<p>Result: The result is returned as a JSON object as follows</p>
+
+<div class="source">
+<div class="source">
+<pre>    {
+       results: &lt;result as a string, if mode = synchronous&gt;
+       error-code: [&lt;code&gt;, &lt;message&gt;] (if an error occurs)
+       handle: &lt;opaque result handle, if mode = asynchronous&gt;
+    }
+</pre></div></div>
+<div class="section">
+<h3><a name="Example"></a>Example</h3>
+<div class="section">
+<h4><a name="Select_query_with_synchronous_result_delivery"></a>Select query with synchronous result delivery</h4>
+
+<div class="source">
+<div class="source">
+<pre>    use dataverse company;
+
+    for $l in dataset('Employee') return $l;
+</pre></div></div>
+<p>API call for the above query statement in the URL-encoded form.</p>
+<p>[http://localhost:19002/query?query=use%20dataverse%20company;for%20$l%20in%20dataset(&#x2018;Employee&#x2019;)%20return%20$l;](<a class="externalLink" href="http://localhost:19002/query?query=use%20dataverse%20company;for%20$l%20in%20dataset(&apos;Employee&apos;)%20return%20$l;">http://localhost:19002/query?query=use%20dataverse%20company;for%20$l%20in%20dataset('Employee')%20return%20$l;</a>)</p></div>
+<div class="section">
+<h4><a name="Response"></a>Response</h4>
+<p><i>HTTP OK 200</i><br />Payload</p>
+
+<div class="source">
+<div class="source">
+<pre>    {
+      &quot;results&quot;: [
+          [
+              &quot;{ &quot;id&quot;: 123, &quot;name&quot;: &quot;John Doe&quot; }&quot;
+          ]
+      ]
+    }
+</pre></div></div></div>
+<div class="section">
+<h4><a name="Same_select_query_with_asynchronous_result_delivery"></a>Same select query with asynchronous result delivery</h4>
+<p>API call for the above query statement in the URL-encoded form with mode=asynchronous</p>
+<p>[http://localhost:19002/query?query=use%20dataverse%20company;for%20$l%20in%20dataset(&#x2018;Employee&#x2019;)%20return%20$l;&amp;mode=asynchronous](<a class="externalLink" href="http://localhost:19002/query?query=use%20dataverse%20company;for%20$l%20in%20dataset(&apos;Employee&apos;)%20return%20$l;&amp;mode=asynchronous">http://localhost:19002/query?query=use%20dataverse%20company;for%20$l%20in%20dataset('Employee')%20return%20$l;&amp;mode=asynchronous</a>)</p></div>
+<div class="section">
+<h4><a name="Response"></a>Response</h4>
+<p><i>HTTP OK 200</i><br />Payload</p>
+
+<div class="source">
+<div class="source">
+<pre>    {
+        &quot;handle&quot;: [45,0]
+    }
+</pre></div></div></div></div></div>
+<div class="section">
+<h2><a name="Mixed_API_Back_to_TOC"></a><a name="AnyApi" id="AnyApi">Mixed API</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p><i>End point for any/mixed statement</i></p>
+<p>Endpoint: <i>/aql</i></p>
+<p>Parameters:</p>
+
+<table border="0" class="table table-striped">
+
+<tr class="a">
+  
+<td>Parameter</td>
+  
+<td>Description</td>
+  
+<td>Required?</td>
+</tr>
+
+<tr class="b">
+  
+<td>query</td>
+  
+<td>Query string to pass to ASTERIX for execution</td>
+  
+<td>Yes</td>
+</tr>
+
+<tr class="a">
+  
+<td>mode</td>
+  
+<td>Indicate if call should be synchronous or asynchronous. mode = synchronous blocks the call until results are available; mode = asynchronous returns immediately with a handle that can be used later to check the query&#x2019;s status and to fetch results when available</td>
+  
+<td>No. default mode = synchronous</td>
+</tr>
+</table>
+<p>Similar to <i><i>/update</i></i> but allows any arbitrary AQL statement rather than only modifications.</p></div>
+<div class="section">
+<h2><a name="Asynchronous_Result_API_Back_to_TOC"></a><a name="AsynchronousResultApi" id="AsynchronousResultApi">Asynchronous Result API</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p><i>End point to fetch the results of an asynchronous query</i></p>
+<p>Endpoint: <i>/query/result</i></p>
+<p>Parameters:</p>
+
+<table border="0" class="table table-striped">
+
+<tr class="a">
+  
+<td>Parameter</td>
+  
+<td>Description</td>
+  
+<td>Required?</td>
+</tr>
+
+<tr class="b">
+  
+<td>handle</td>
+  
+<td>Result handle that was returned by a previous call to a /query call with mode = asynchronous</td>
+  
+<td>Yes</td>
+</tr>
+</table>
+<p>Result: The result is returned as a JSON object as follows:</p>
+
+<div class="source">
+<div class="source">
+<pre>    {
+       results: &lt;result as a string, if mode = synchronous, or mode = asynchronous and results are available&gt;
+       error-code: [&lt;code&gt;, &lt;message&gt;] (if an error occurs)
+    }
+</pre></div></div>
+<p>If mode = asynchronous and results are not available, the returned JSON object is empty: { }</p>
+<div class="section">
+<h3><a name="Example"></a>Example</h3>
+<div class="section">
+<h4><a name="Fetching_results_for_asynchronous_query"></a>Fetching results for asynchronous query</h4>
+<p>We use the handle returned by the asynchronous query to get the results for the query. The handle returned was:</p>
+
+<div class="source">
+<div class="source">
+<pre>    {
+        &quot;handle&quot;: [45,0]
+    }
+</pre></div></div>
+<p>API call for reading results from the previous asynchronous query in the URL-encoded form.</p>
+<p><a class="externalLink" href="http://localhost:19002/query/result?handle=%7B%22handle%22%3A+%5B45%2C+0%5D%7D">http://localhost:19002/query/result?handle=%7B%22handle%22%3A+%5B45%2C+0%5D%7D</a></p></div>
+<div class="section">
+<h4><a name="Response"></a>Response</h4>
+<p><i>HTTP OK 200</i><br />Payload</p>
+
+<div class="source">
+<div class="source">
+<pre>    {
+      &quot;results&quot;: [
+          [
+              &quot;{ &quot;id&quot;: 123, &quot;name&quot;: &quot;John Doe&quot; }&quot;
+          ]
+      ]
+    }
+</pre></div></div></div></div></div>
+<div class="section">
+<h2><a name="Query_Status_API_Back_to_TOC"></a><a name="QueryStatusApi" id="QueryStatusApi">Query Status API</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p><i>End point to check the status of the query asynchronous</i></p>
+<p>Endpoint: <i>/query/status</i></p>
+<p>Parameters:</p>
+
+<table border="0" class="table table-striped">
+
+<tr class="a">
+  
+<td>Parameter</td>
+  
+<td>Description</td>
+  
+<td>Required?</td>
+</tr>
+
+<tr class="b">
+  
+<td>handle</td>
+  
+<td>Result handle that was returned by a previous call to a /query call with mode = asynchronous</td>
+  
+<td>Yes</td>
+</tr>
+</table>
+<p>Result: The result is returned as a JSON object as follows:</p>
+
+<div class="source">
+<div class="source">
+<pre>    {
+       status: (&quot;RUNNING&quot; | &quot;SUCCESS&quot; | &quot;ERROR&quot;)
+    }
+</pre></div></div></div>
+<div class="section">
+<h2><a name="Error_Codes_Back_to_TOC"></a><a name="ErrorCodes" id="ErrorCodes">Error Codes</a> <font size="4"><a href="#toc">[Back to TOC]</a></font></h2>
+<p>Table of error codes and their types:</p>
+
+<table border="0" class="table table-striped">
+
+<tr class="a">
+  
+<td>Code</td>
+  
+<td>Type</td>
+</tr>
+
+<tr class="b">
+  
+<td>1</td>
+  
+<td>Invalid statement</td>
+</tr>
+
+<tr class="a">
+  
+<td>2</td>
+  
+<td>Parse failures</td>
+</tr>
+
+<tr class="b">
+  
+<td>99</td>
+  
+<td>Uncategorized error</td>
+</tr>
+</table></div>
+                  </div>
+            </div>
+          </div>
+
+    <hr/>
+
+    <footer>
+            <div class="container-fluid">
+              <div class="row span12">Copyright &copy;                    2017
+                        <a href="https://www.apache.org/">The Apache Software Foundation</a>.
+            All Rights Reserved.      
+                    
+      </div>
+
+                                                                  <?xml version="1.0" encoding="UTF-8"?>
+<div class="row-fluid">Apache AsterixDB, AsterixDB, Apache, the Apache
+        feather logo, and the Apache AsterixDB project logo are either
+        registered trademarks or trademarks of The Apache Software
+        Foundation in the United States and other countries.
+        All other marks mentioned may be trademarks or registered
+        trademarks of their respective owners.</div>
+                  
+        
+                </div>
+    </footer>
+  </body>
+</html>