我尝试通过REST API使用Java查询Sugar，以获取特定用户的Meetings模块中的条目，即当前登录的用户。
我正在谷歌上搜索解决方案几天。
我做了一个login（）调用，在那里我得到了一个会话ID，而不是调用get_user_id（）。使用返回的用户ID，我尝试使用get_entry_list（）查询Meetings模块。
要将会议分配给UserID，它使用以下查询字符串，其中mUserId保存返回的用户ID get_user_id（）：
queryString = "meetings.assigned_user_id='"+mUserId+"'";
但我不仅希望得到分配用户的会议，还要参加他参与的所有会议。为此，我在查询中的meetings_users表上尝试子查询。
这是我尝试过的查询字符串，它正在处理MySQL提示符。但是当我在REST上尝试这个时，它会返回“无效的会话ID”：
queryString = "meetings.id IN ( SELECT meetings_users.meeting_id FROM meetings_users WHERE meetings_users.user_id = '"+mUserId+"' )";
有人对此有暗示吗？哪种情况会导致“无效的会话ID”？
什么也不起作用，例如将“and deleted ='0'”追加到第一个陈述的查询中：
queryString = "meetings.assigned_user_id='"+mUserId+"' and deleted = '0'";
也失败了。
这里要求的是完整的代码示例，平台是Android，API Level 8：
private JSONArray getEntryList(String moduleName,
String selectFields[], String queryString, String orderBy, int max_results) throws JSONException, IOException, KeyManagementException, NoSuchAlgorithmException
{
JSONArray jsoSub = new JSONArray();
if (selectFields.length > 0)
{
for (int i = 0; i < selectFields.length; i++)
{
jsoSub.put(selectFields[i]);
}
}
// get_entry_list expects parameters to be ordered, JSONObject does
// not provide this, so I built my JSON String on my own
String sessionIDPrefix = "{\"session\":\""+ mSessionId+ "\"," +
"\"modulename\":\""+ moduleName+ "\"," +
"\"query\":\""+ queryString + "\"," +
"\"order_by\":\""+ orderBy + "\"," +
"\"offset\":\""+ mNextOffset+ "\"," +
"\"select_fields\":["+ jsoSub.toString().substring(
1, jsoSub.toString().length()-2)+ "\"],"+
"\"max_results\":\""+ 20 + "\"}";
String restData = sessionIDPrefix;
Log.d(TAG, restData);
String data = null;
String baseurl = mUrl + REST_URI_APPEND;
data = httpPost(baseurl+"?method=get_entry_list&input_type=json&response_type=json&rest_data="+restData);
Log.d(TAG, data);
JSONObject jsondata = new JSONObject(data);
mResultCount = jsondata.getInt("result_count");
mNextOffset = jsondata.getInt("next_offset");
return jsondata.getJSONArray("entry_list");
}
private String httpPost(String urlStr) throws IOException{
String urlSplitted [] = urlStr.split("/", 4);
String hostPort[] = urlSplitted[2].split(":");
String hostname = hostPort[0];
int port = 80;
if (hostPort.length > 1)
port = new Integer(hostPort[1]);
String file = "/"+urlSplitted[3];
Log.d(TAG, hostname + ", " + port + ", " +file);
URL url = null;
try {
url = new URL("http", hostname, port, file);
} catch (MalformedURLException e) {
throw new IOException(mContext.getText(R.string.error_malformed_url).toString());
}
Log.d(TAG, "URL "+url.toString());
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
throw new IOException(mContext.getText(R.string.error_conn_creat).toString());
}
conn.setConnectTimeout(60 * 1000);
conn.setReadTimeout(60 * 1000);
try {
conn.setRequestMethod("POST");
} catch (ProtocolException e) {
throw new IOException(mContext.getText(R.string.error_post).toString());
}
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setAllowUserInteraction(false);
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
try {
conn.connect();
} catch (IOException e) {
throw new IOException(mContext.getText(R.string.error_conn_open).toString()
+ "\n" + e.getMessage());
}
int response = 0;
String responseMessage = null;
try {
response = conn.getResponseCode();
responseMessage = conn.getResponseMessage();
} catch (IOException e) {
conn.disconnect();
throw new IOException(mContext.getText(R.string.error_resp_io).toString());
}
Log.d(TAG, "Exception Response "+ response);
if (response != 200) {
conn.disconnect();
throw new IOException(mContext.getText(R.string.error_http).toString()
+ "\n" + response + " " + responseMessage);
}
StringBuilder sb = null;
try {
BufferedReader rd = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
sb = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
Log.d(TAG,"line " + line);
sb.append(line);
}
rd.close();
} catch (IOException e) {
conn.disconnect();
throw new IOException(mContext.getText(R.string.error_resp_read).toString());
}
conn.disconnect();
if (sb.toString() == null)
{
throw new IOException(mContext.getText(R.string.error_resp_empty).toString());
}
return sb.toString();
}
调用上面的代码：
if (login() != OK)
return null;
mResultCount = -1;
mNextOffset = 0;
mUserId = getUserId();
String fields[] = new String [] {
"id",
"name",
"description",
"location",
"date_start",
"date_end",
"status",
"type",
"reminder_time",
"parent_type",
"parent_id",
"deleted",
"date_modified"
};
String queryString = null;
if (syncAllUsers)
queryString = "";
else
{
queryString = "meetings.assigned_user_id = 'seed_sarah_id' and meetings.deleted = '0'";
//queryString = "meetings.id IN ( SELECT meeting_id FROM meetings_users WHERE user_id ='"+mUserId+"'";
}
entryList.clear();
while (mResultCount != 0)
{
if (!seamless_login())
return null;
JSONArray serverEntryList = getEntryList(
"Meetings", fields, queryString, "date_start", 0);
//... do sth with data
}
totalContactsResults += mResultCount;
}
logout();
login（）返回有效的会话ID，getUserId（）返回正确的id。整个代码已经用于获取联系人，并且还用于如上所述的简单查询。
提前致谢
马克
答案 0 :(得分：1)
使用get_relationships Web服务调用可能会更好。
SugarRest.call('get_relationships', [SugarRest.session, 'Users', SugarRest.user_id, 'meetings', '', ['name'], 0, ''])
这应该就是你所需要的。在“会议”之后的参数中，您还可以传入其他过滤器。
答案 1 :(得分：1)
经过进一步测试，我意识到，查询字符串中的空格是问题所在。它们导致包含空格的URL。为了避免必须进行某种URL编码。
我在httpPost方法中编码整个URL没有成功（似乎没有必要）。但是在查询字符串中用'+'替换空格对我有用：
queryString = "meetings.id+IN+(SELECT+meetings_users.meeting_id+FROM meetings_users+WHERE+meetings_users.user_id='"+mUserId+"')";
如果有人有更优雅的方法，请告诉我。