Currently this code was tested on local devapp server running GAE SDK 1.3.1
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<jsp:directive.page language="java" contentType="text/html; charset=UTF-8" isELIgnored="false"/>
<jsp:directive.page import="com.google.appengine.api.datastore.Cursor"/>
<jsp:directive.page import="com.google.appengine.api.datastore.DatastoreServiceFactory"/>
<jsp:directive.page import="com.google.appengine.api.datastore.Entity"/>
<jsp:directive.page import="com.google.appengine.api.datastore.FetchOptions"/>
<jsp:directive.page import="com.google.appengine.api.datastore.QueryResultIterator"/>
<jsp:directive.page import="com.google.appengine.api.datastore.PreparedQuery"/>
<jsp:directive.page import="com.spoledge.audao.parser.gql.GqlDynamic"/>
<jsp:directive.page import="java.util.ArrayList"/>
<jsp:directive.page import="java.util.HashSet"/>
<jsp:directive.page import="java.util.Iterator"/>
<html>
<head>
<title>GQL Console</title>
<style type="text/css">
body { background: #fff; color: #333; font-family: Arial, Verdana, Sans-Serif;}
table { border-collapse: collapse; border: 1px solid #888; width:100%}
td { border-top: 1px solid #888; padding: 2px 10px; font-size: 85%}
tr.header td { font-weigth: bold; background: #555; color: #fff}
tr.even td { background: #fff;}
tr.odd td { background: #ccc;}
</style>
</head>
<body>
<form action="gql.jsp" method="post">
Enter a GQL query (e.g. "SELECT * FROM MyEntity WHERE propertyName='propertyValue'"):<br/>
<input type="text" size="96" name="gql" value="<c:out value="${param.gql}" escapeXml="true"/>"/><br/>
<input type="submit" value="Execute"/>
</form>
<%
String gql = request.getParameter( "gql" );
String encCursor = request.getParameter( "cursor" );
int offset = 0;
int maxRows = 20;
try {
offset = Integer.parseInt( request.getParameter("offset"));
}
catch (Exception e) {}
if (gql != null && gql.length() != 0) {
GqlDynamic gqld = new GqlDynamic();
gqld.setDatastoreService( DatastoreServiceFactory.getDatastoreService());
try {
PreparedQuery pq = gqld.prepareQuery( gql );
FetchOptions fo = gqld.getFetchOptions();
if (encCursor != null) {
// add +1 to detect more rows:
FetchOptions foo = FetchOptions.Builder.withLimit( (fo.getLimit() != null ? fo.getLimit() : maxRows)+1);
foo.cursor( Cursor.fromWebSafeString( encCursor ));
fo = foo;
}
else {
offset = fo.getOffset();
if (fo.getLimit() == null) fo.limit( maxRows + 1 );
}
QueryResultIterator<Entity> result = pq.asQueryResultIterator( fo );
Cursor cursor = null;
// find all property names
ArrayList<Entity> entities = new ArrayList<Entity>( maxRows );
HashSet<String> propNameSet = new HashSet<String>();
while (result.hasNext()) {
Entity ent = result.next();
propNameSet.addAll( ent.getProperties().keySet() );
entities.add( ent );
if (entities.size() >= maxRows) {
if (result.hasNext()) cursor = result.getCursor();
break;
}
}
ArrayList<String> propNames = new ArrayList<String>( propNameSet );
java.util.Collections.sort( propNames,
new java.util.Comparator<String>() {
public int compare( String s1, String s2) {
return s1.compareTo( s2 );
}
});
// render header
out.print("<table><tr class=\"summary\"><td colspan=\""+ (propNames.size()+1)+"\">");
if (entities.size() == 0) {
out.print("No records found");
}
else {
out.print("<b>" + (offset+1) + '-' + (offset+entities.size()) + "</b> ");
if (cursor != null) {
out.print("<a href=\"gql.jsp?gql=" + gql + "&cursor=" + cursor.toWebSafeString()
+ "&offset=" + (offset+maxRows)
+ "\">Next</a> " );
}
else {
out.print( "Next" );
}
}
out.print("</td></tr>");
if (entities.size() != 0) {
out.print("<tr class=\"header\">");
out.print("<td>Id</td>");
for (String propName : propNames) {
out.print("<td>" + propName + "</td>");
}
out.print("</tr>");
}
// render values
int i = 0;
for (Entity ent : entities) {
out.print("<tr class=\"" + ((++i % 2)==0 ? "odd" : "even" ) +"\">");
out.print("<td>");
out.print( ent.getKey().getName() != null ? ent.getKey().getName() : ent.getKey().getId());
out.print("</td>");
for (String propName : propNames) {
out.print( "<td>" );
if (ent.hasProperty( propName )) {
Object o = ent.getProperty( propName );
if (o == null) {
out.print( "null" );
}
else {
pageContext.setAttribute("val", o.toString());
%>
<c:out value="${val}" escapeXml="true"/>
<%
}
}
out.print( "</td>" );
}
out.print("</tr>");
}
out.print("</table>");
}
catch (Exception e) {
out.print( "Invalid GQL: " + e );
e.printStackTrace();
}
}
else {
%>
Please enter a query.
<%
}
%>
</body>
</html>
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