getAnnotationNames.php
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	<?php

	// case insensitive with regex
	// todo correct?
	//select annotation_name
	//from shrine_ont.annotation_names
	//where annotation_name ~* '.a1.'
	//LIMIT 20

	$conn = pg_connect("host=localhost port=5432 dbname=i2b2 user=shrine_ont password=demouser");

	if (!$conn) {
	echo "Error while connecting to the postgres database";
	exit;
	}

	// get the row which contains all the values of the passed annotation
	$query =
	"SELECT annotation_name
	FROM shrine_ont.annotation_names
	WHERE annotation_name ~* '." . $_GET["annotation_name"] .".'
	LIMIT " . $_GET["limit"];

	$result = pg_query($conn, $query);
	if (!$result) {
	echo "An error occurred.\n";
	exit;
	}

	// In json format return the list of annotation names
	$annotationList = "";
	while ($row = pg_fetch_row($result)) {
	$annotationList .= "\"$row[0]\",";
	}
	// drop the last comma and concatenate in json format
	echo "[" . substr($annotationList, 0, -1) . "]";