Is it possible with OrmLite to create a sql script file to easily populate the database with data? I did some searching and couldn't come up with anything easy. I know I can create some objects with data, I'm just looking for a cleaner method.
I'm thinking create a script file, open a a reader at load, and process each file as raw SQL the executeRaw() method. Any thoughts?
Just wanted to post my solution for anyone who might need it
try {
tableDAO.updateRaw("DELETE FROM table");
InputStream is = getResources().openRawResource(R.raw.populate_db);
DataInputStream in = new DataInputStream(is);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null) {
tableDAO.updateRaw(strLine);
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
Good one Joe. I think your idea of the executeRaw() is close but use updateRaw() instead. Update handles INSERT, DELETE, and UPDATE statements.
http://ormlite.com/docs/raw-update
You should call TableUtils to create your schema first of course:
http://ormlite.com/docs/tableUtils
Hope this helps. You may want to use the mailing list for questions in the future:
http://groups.google.com/group/ormlite-user/
Related
I'm currently learning android with a books called "Android Programming - The Big Nerd Ranch Guide".
As a part of a learning project we create Json serializer for saving and loading data. Writing the file appearently works fine, and I get no error messages on the Logcat. After I terminate the app and recreate it, the data loader is called and raises the following exception:
org.json.JSONException: End of input at character 0
I've looked for this issue online and figured it's probably because the BufferedReader returns an empty response. I've checked and indeed it is the case.
For simplicity sake, I've temporarily put a BufferedReader into the saving function and tried reading the info I've just saved into the file, and still the BufferedReader returns only null.
public void saveCrimes(ArrayList<Crime>crimes)
throws JSONException, IOException {
JSONArray array = new JSONArray();
for(Crime c: crimes)
array.put(c.toJSON());
Writer writer = null;
try {
OutputStream out = mContext.openFileOutput(mFileName, Context.MODE_PRIVATE);
writer = new OutputStreamWriter(out);
writer.write(array.toString());
Log.d(TAG, array.toString());
} finally {
if(writer == null)
writer.close();
}
// Extracting the data
BufferedReader bufferedReader = null;
try {
InputStream inputStream = mContext.openFileInput(mFileName);
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
if (bufferedReader.readLine() == null)
Log.d(TAG, "WHY GOD WHYYYYYYY");
}catch (IOException e){
}
}
(The two log messages from the code, the first one displays the data that is in the JsonArray I'm using)
D/CriminalIntentJSONSerializer: [{"date":"Mon May 14 17:33:08 GMT+00:00 2018","id":"97fe9532-991f-4352-9de1-602fa8dfa93e","isSolved":true,"title":""}]
D/CriminalIntentJSONSerializer: WHY GOD WHYYYYYYY
Would love to hear your insight.
BufferedReader bufferedReader = null;
try {
InputStream inputStream = mContext.openFileInput(mFileName);
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
if (bufferedReader.readLine() == null)
Log.d(TAG, "WHY GOD WHYYYYYYY");
}catch (IOException e){
}
Ok. you've created your BufferedReader bufferedReader = null;
What happens when yuou say bufferedReader = new BufferedReader(anything)...Well...it can't call a new instance the same thing that's already been declared...in fact, it's already been instantiated as null. So you can't create a new instance of the same name.
Try deleting the line where you point it at null. Then, substitute
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
for the original declaration in your try block
Try to check if mFilename is empty on second try-catch, usually in Android instance disappear easily.
PD: I advise you choice another JSON library to manipulte JSON files, they are lightweight and easy-to-use.
== Edit ==
Have you added writing and reading permissions on AndroidManifest?
If answer is "there it is" try to debug app step-by-step looking for variables and in-variables for checking existence of values.
Could be file isn't writing itself or it's writing empty.
Error basically is empty string or non-format JSON-like:
""
"[{"a": "abdc", "b": "jef2","
Paying attention to BufferedReader because it read lines each and you need all file and then join into string variable.
Also, try to use android file explorer that come in AndroidStudio. There you can explore files, logs and database files and export them to your specific folders (Documents, Downloads, etc). Generally files written by app are stored in data -> <com.your.app.package>.
I'm a new student working on an android application. The application is almost done and works fine.
The app uses a property list to generate it's content. At this moment it uses a .plist file located in the assets folder. Ideally I want this .plist file to be retrieved from an URL. However i'm stuck on this part for a few days now.
Could you please advise me in how to realise retrieving and using the file from an URL. Any advice is welcome!
In my code we see how I currently read the .plist file. I don't think the parsing of the response is required info for my question:
public class PListHelper {
/**
* PlayList reader from assets
*
* #return string of p-list file
*/
public static String readPlayListFromAssets(Context context) {
StringBuffer sb = new StringBuffer();
BufferedReader br=null;
try {
br = new BufferedReader(new InputStreamReader(context.getAssets().open("restaurant.plist")));
String temp;
while ((temp = br.readLine()) != null)
sb.append(temp);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
br.close(); // stop reading
} catch (IOException ex) {
ex.printStackTrace();
}
}
Log.i("Main", "input: "+sb.toString());
return sb.toString();
}
Have a look at URLConnection
Also, in the future, avoid using .plist as it something specific to ios and osx. By using another format (like json) you won't have to implement your own parsing.
I am using an application which parse remote json into a list view and it works fine as single activity and if the device is online..
Is there a way to download the json data locally(cached) in the device and then pull it inside my app inside Listviews.. i am planning to have multiple listviews which takes the data from the same json file and then filter them out based on some criteria such as location then allow user to swipe the app for different views.
I appreciate your advices,
Abdul
I have one idea , i hope it will work for you
Store content of file in Object that is in cache in form of JSON .
Now Object have all your content which you can pass to JsonArray or JsonObject to parse.
File file = new File("C:/ciphertext.txt");
int ch;
StringBuffer strContent = new StringBuffer("");
FileInputStream fin = null;
try {
fin = new FileInputStream(file);
while ((ch = fin.read()) != -1)
strContent.append((char) ch);
fin.close();
} catch (Exception e) {
System.out.println(e);
}
Now our strContent have content of file.
You can store the data in SharedPreference.
Check this out
And also, there are more Storage Options for you.
I've been given a database of english words but they're in a .txt file. not an sql file.
My professor told me I could use it as database for my dictionary application instead of using sqlite.
Can anybody please give me any idea how to access the notepad?
I need to compare an inputWord to the notepad files and if found, it will copy the definition of the inputWord from the notepad and display it onscreen.
Notepad files have UTF-8 Text String stored in them, what you will have to do is to read the whole file, parse the keywords and their definitions , and then search for any keyword in the list.
a pseudocode for that would look like this:
FileInputStream fis = new FileInputStream("the_file_name");
BufferedReader br = new BufferedReader(new InputStreamReader(fis, Charset.forName("UTF-8")));
StringBuilder builder = new StringBuilder();
String line = null;
do {
line = br.readLine();
builder.append(line);
} while (line != null);
parseFile(builder.toString);
public void parseFile(String txt){
....... code to parse the txt from file and pass it to variables to use in the comparison
}
I'm developing an android application which is to collect data and then send it to a web directory.
So lets say a want to collect an array of data on the phone, and then after clicking a button send it all to the online directory as a file or stream. It does not even need to get a response - although in the future a confirmation would be handy.
Here is a guess at the sort of order of things...
dir = "someurl.com/data/files_received";
Array data;
sendDataSomehow(dir, data); //obv the difficult bit!
I am in very early stages of developing for Android although I have a lot of experience coding web so that bit will be fine.
I have found suggestions for things such as JSON, Google GSON, HTTP POST and GET - do these sound like the right track?
I hope I have been clear enough.
Yep, JSON would be a good solution for this.
Encode your array as JSON and then send it to your web server as the body of an HTTP POST request. If you have an hour to kill, here's a really good video from Google IO last year explaining how to implement a REST client on Android (what you're doing isn't strictly REST-ful, but the calls you make to the server are very similer): http://www.google.com/events/io/2010/sessions/developing-RESTful-android-apps.html
Right, just wanted to do a quick thank for putting me on the right track. Just had one of those THE CODE WORKS EUREKA moments, very happy. I haven't used JSON but I have managed to pass a variable from Android to SQL through a HTTP-POST and little bit of PHP.
I'm sure this is not the recommended ideology for many reasons although for prototype and presentation it will do just fine!
Here is the code for android:
try {
URL url = new URL("http://www.yourwebsite.com/php_script.php");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setAllowUserInteraction(false);
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStream out = conn.getOutputStream();
Writer writer = new OutputStreamWriter(out, "UTF-8");
writer.write("stringToPass=I'd like to pass this");
writer.close();
out.close();
if(conn.getResponseCode() != 200)
{
throw new IOException(conn.getResponseMessage());
}
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = rd.readLine()) != null)
{
sb.append(line);
}
rd.close();
conn.disconnect();
} catch (MalformedURLException e1) {
textBox.setText(e1.toString());
} catch (IOException e2) {
textBox.setText(e2.toString());
}
And here is the code for the PHP:
$conn = mysql_connect("localhost","web108-table","********") or die (mysql_error());
mysql_select_db("web108-table",$conn) or die (mysql_error());
$str = $_POST['stringToPass'];
mysql_query("INSERT INTO table(field) VALUES ($str)");
This code works, very simple. Next tests will be to find out if it is suitable for a large number of strings.
I hope this is helpful to somebody else.