Apart from the explicitly defined procedure based rest services, the generated jax-rs war file will also implicitly include a special rest based service under URI "/query" that can take any XML or JSON producing SQL as parameter and expose the results of that query as result of the service. This service is defined with "POST", accepting a Form Parameter named "sql". For example, after you deploy the VDB defined in above example, you can issue a HTTP POST call as
http://localhost:8080/sample_1/view/query
sql=SELECT XMLELEMENT(NAME "rows",XMLAGG(XMLELEMENT(NAME "row", XMLFOREST(e1, e2)))) AS xml_out FROM PM1.G1
http://localhost:8080/sample_1/view/query
sql=SELECT XMLELEMENT(NAME "rows",XMLAGG(XMLELEMENT(NAME "row", XMLFOREST(e1, e2)))) AS xml_out FROM PM1.G1
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A sample HTTP Request from Java can be made like below:
public static String httpCall(String url, String method, String params) throws Exception {
StringBuffer buff = new StringBuffer();
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.setRequestMethod(method);
connection.setDoOutput(true);
if (method.equalsIgnoreCase("post")) {
OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream());
wr.write(params);
wr.flush();
}
BufferedReader serverResponse = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = serverResponse.readLine()) != null) {
buff.append(line);
}
return buff.toString();
}
public static void main(String[] args) throws Exception {
String params = URLEncoder.encode("sql", "UTF-8") + "=" + URLEncoder.encode("SELECT XMLELEMENT(NAME "rows",XMLAGG(XMLELEMENT(NAME "row", XMLFOREST(e1, e2)))) AS xml_out FROM PM1.G1", "UTF-8");
httpCall("http://localhost:8080/sample_1/view/query", "POST", params);
}
public static String httpCall(String url, String method, String params) throws Exception {
StringBuffer buff = new StringBuffer();
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.setRequestMethod(method);
connection.setDoOutput(true);
if (method.equalsIgnoreCase("post")) {
OutputStreamWriter wr = new OutputStreamWriter(connection.getOutputStream());
wr.write(params);
wr.flush();
}
BufferedReader serverResponse = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = serverResponse.readLine()) != null) {
buff.append(line);
}
return buff.toString();
}
public static void main(String[] args) throws Exception {
String params = URLEncoder.encode("sql", "UTF-8") + "=" + URLEncoder.encode("SELECT XMLELEMENT(NAME "rows",XMLAGG(XMLELEMENT(NAME "row", XMLFOREST(e1, e2)))) AS xml_out FROM PM1.G1", "UTF-8");
httpCall("http://localhost:8080/sample_1/view/query", "POST", params);
}
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