I have code that fetches contact information from Android using the contact name as the selection. However, the datasource (which I guess would be ContactsContract.Contacts) does not have everything I need about the contact. I see that contact information is divided between several tables (ContactsContract.CommonDataKinds.StructuredName, ContactsContract.CommonDataKinds.Phone, etc). I have also notices that all of these sources have access to a LOOKUP_KEY field. It uniquely identifies a contact. I want to know if there is a way to perform a join on these datasources using the LOOKUP_KEY.
Below, I currently setup the projection and selection for a single datasource and query it asynchronously using a cursor loader. Is there a way to search multiple datasources at once using the LOOKUP_KEY?
private static final String[] CONTACT_PROJECTION = {
ContactsContract.Contacts._ID,
ContactsContract.Contacts.LOOKUP_KEY,
ContactsContract.Contacts.DISPLAY_NAME_PRIMARY,
ContactsContract.Contacts.HAS_PHONE_NUMBER
};
private static final String CONTACT_SELECTION = ContactsContract.Contacts.DISPLAY_NAME_PRIMARY
+ " LIKE ?";
public static Loader<Cursor> getContactLoader(Context applicationContext, String searchString) {
String[] selectionArgs = new String[1];
selectionArgs[0] = "%" + searchString + "%";
return new CursorLoader(
applicationContext,
ContactsContract.Contacts.CONTENT_URI,
CONTACT_PROJECTION,
CONTACT_SELECTION,
selectionArgs,
null
);
}
All info on all contacts is grouped in alias tables, which are actually stored in a single big table called Data, so you can simply query that table for all info related to a specific contact (you can use CONTACT_ID, no need to mess with the more problematic LOOKUP_URI), like so:
public void getContactInfo(long contactId) {
Uri uri = Data.CONTENT_URI;
String[] projection = new String[]{
Data.CONTACT_ID,
Data.DISPLAY_NAME,
Data.MIMETYPE,
Data.DATA1}; // you can get additional info if needed in Data.DATA2, DATA3, etc.
// get all relevant info about the contact
String selection = Data.CONTACT_ID + "=? AND " + Data.MIMETYPE + " IN (?,?,?,?)"; // you can add more question marks if you need more MIMETYPES
String[] selectionArgs = new String[]{String.valueOf(contactId), Phone.CONTENT_ITEM_TYPE, Email.CONTENT_ITEM_TYPE, Event.CONTENT_ITEM_TYPE, StructuredPostal.CONTENT_ITEM_TYPE};
Cursor cursor = getContentResolver().query(uri, projection, selection, selectionArgs, null);
while (cursor.moveToNext()) {
String name = cursor.getString(1);
String mimetype = cursor.getString(2);
String data = cursor.getString(3);
// use the mimetype to figure out what kind of info is in this row
Log.i("Contact Info", contactId + "=> " + name + " - " + mimetype + ": " + data);
}
cursor.close();
}
Related
so i recently learn to write a code in android using sqlite and i try to select data from sqlite but this error occur
ive tried some suggestion from the internet and read my book but i didnt solve my problem
public Penyakit getPenyakit1(String namaGejal){
SQLiteDatabase db = this.getReadableDatabase();
String query = "SELECT idPen FROM " + TABLE_CONTACTS + " WHERE " +
namapen + " =\"" + namaGejal + "\"";
Cursor cursor = db.rawQuery(query,null);
Penyakit penyakit = new Penyakit();
if(cursor.moveToFirst()){
cursor.moveToFirst();
penyakit.set_nomber(Integer.parseInt(cursor.getColumnName(0)));
penyakit.set_namaPen(cursor.getColumnName(1));
penyakit.set_idPenyakit(Integer.parseInt(cursor.getColumnName(2)));
penyakit.set_namGej(cursor.getColumnName(3));
penyakit.set_idGejala(Integer.parseInt(cursor.getColumnName(4)));
cursor.close();
} else {
penyakit=null;
}
return penyakit;
}
this is logcat
Process: com.example.lordbramasta.pakar, PID: 18914
java.lang.NumberFormatException: For input string: "idPen"
at java.lang.Integer.parseInt(Integer.java:615)
at java.lang.Integer.parseInt(Integer.java:650)
at com.example.lordbramasta.pakar.DBAdapter.getPenyakit1(DBAdapter.java:79)
i expected the value of idPen get selected , thank you
Your problem is this line:
penyakit.set_nomber(Integer.parseInt(cursor.getColumnName(0)));
cursor.getColumnName(0) returns idPen as this is the name of the only column returned by your query:
SELECT idPen FROM ....
and your code is trying to cast the string "idPen" to an integer.
So getColumnName() returns the name of the column at a specified index and not the value of the column.
You should do
penyakit.set_nomber(Integer.parseInt(cursor.getString(0)));
or if the data type of the column idPen is INTEGER then:
penyakit.set_nomber(cursor.getInt(0));
Also don't try to get any other columns because your query returns only 1.
Note: remove that cursor.moveToFirst(); inside the if block because it is already executed.
Probably you need to use a ' instead of ". So, change the query to the following:
String query = "SELECT idPen FROM " + TABLE_CONTACTS + " WHERE " +
namapen + " =\'" + namaGejal + "\'";
I'm suggesting you to use SQLiteDatabase.query() instead rawQuery like this:
// Define a projection that specifies which columns from the database
// you will actually use after this query.
String[] projection = {
"idPen"
};
// Filter results WHERE "namapen" = 'namaGejal'
String selection = "namapen" + " = ?";
String[] selectionArgs = { namaGejal };
// How you want the results sorted in the resulting Cursor
String sortOrder = null; // null for default order
Cursor cursor = db.query(
TABLE_CONTACTS, // The table to query
projection, // The array of columns to return (pass null to get all)
selection, // The columns for the WHERE clause
selectionArgs, // The values for the WHERE clause
null, // don't group the rows
null, // don't filter by row groups
sortOrder // The sort order
);
// do something with the cursor
Please take a look Read information from a database
If you want to get all columns data from your TABLE_CONTACTS use SELECT * FROM
Instead of using direct query to db im using contentResolver but it returns null. And i dont know do i need to add some code or there is a mistake in mine.
private void displayDatabaseInfo() {
// Define a projection that specifies which columns from the database
// you will actually use after this query.
String[] projection = {
PetEntry._ID,
PetEntry.COLUMN_PET_NAME,
PetEntry.COLUMN_PET_BREED,
PetEntry.COLUMN_PET_GENDER,
PetEntry.COLUMN_PET_WEIGHT };
// Perform a query on the provider using the ContentResolver.
// Use the {#link PetEntry#CONTENT_URI} to access the pet data.
Cursor cursor = getContentResolver().query(
PetEntry.CONTENT_URI, // The content URI of the words table
projection, // The columns to return for each row
null, // Selection criteria
null, // Selection criteria
null); // The sort order for the returned rows
Log.v(LOG_TAG, "Проверка курсора " + cursor);
TextView displayView = (TextView) findViewById(R.id.text_view_pet);
if (cursor != null){
try {
// Create a header in the Text View that looks like this:
//
// The pets table contains <number of rows in Cursor> pets.
// _id - name - breed - gender - weight
//
// In the while loop below, iterate through the rows of the cursor and display
// the information from each column in this order.
displayView.setText("The pets table contains " + cursor.getCount() + " pets.\n\n");
displayView.append(PetEntry._ID + " - " +
PetEntry.COLUMN_PET_NAME + " - " +
PetEntry.COLUMN_PET_BREED + " - " +
PetEntry.COLUMN_PET_GENDER + " - " +
PetEntry.COLUMN_PET_WEIGHT + "\n");
// Figure out the index of each column
int idColumnIndex = cursor.getColumnIndex(PetEntry._ID);
int nameColumnIndex = cursor.getColumnIndex(PetEntry.COLUMN_PET_NAME);
int breedColumnIndex = cursor.getColumnIndex(PetEntry.COLUMN_PET_BREED);
int genderColumnIndex = cursor.getColumnIndex(PetEntry.COLUMN_PET_GENDER);
int weightColumnIndex = cursor.getColumnIndex(PetEntry.COLUMN_PET_WEIGHT);
// Iterate through all the returned rows in the cursor
while (cursor.moveToNext()) {
// Use that index to extract the String or Int value of the word
// at the current row the cursor is on.
int currentID = cursor.getInt(idColumnIndex);
String currentName = cursor.getString(nameColumnIndex);
String currentBreed = cursor.getString(breedColumnIndex);
int currentGender = cursor.getInt(genderColumnIndex);
int currentWeight = cursor.getInt(weightColumnIndex);
// Display the values from each column of the current row in the cursor in the TextView
displayView.append(("\n" + currentID + " - " +
currentName + " - " +
currentBreed + " - " +
currentGender + " - " +
currentWeight));
}
} finally {
// Always close the cursor when you're done reading from it. This releases all its
// resources and makes it invalid.
cursor.close();
}
}
}
Before that i got an error null exception. After added if/else statement exceptions dissapeared but anyway it doesnt work and returns null
Problem was in ContentProvider. I have changed code and now it works.
#Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
// Get readable database
SQLiteDatabase database = mDbHelper.getReadableDatabase();
// This cursor will hold the result of the query
Cursor cursor;
// Figure out if the URI matcher can match the URI to a specific code
int match = sUriMatcher.match(uri);
switch (match) {
case PETS:
// For the PETS code, query the pets table directly with the given
// projection, selection, selection arguments, and sort order. The cursor
// could contain multiple rows of the pets table.
cursor = database.query(PetEntry.TABLE_NAME, projection, selection, selectionArgs,
null, null, sortOrder);
break;
case PET_ID:
// For the PET_ID code, extract out the ID from the URI.
// For an example URI such as "content://com.example.android.pets/pets/3",
// the selection will be "_id=?" and the selection argument will be a
// String array containing the actual ID of 3 in this case.
//
// For every "?" in the selection, we need to have an element in the selection
// arguments that will fill in the "?". Since we have 1 question mark in the
// selection, we have 1 String in the selection arguments' String array.
selection = PetEntry._ID + "=?";
selectionArgs = new String[] { String.valueOf(ContentUris.parseId(uri)) };
// This will perform a query on the pets table where the _id equals 3 to return a
// Cursor containing that row of the table.
cursor = database.query(PetEntry.TABLE_NAME, projection, selection, selectionArgs,
null, null, sortOrder);
break;
default:
throw new IllegalArgumentException("Cannot query unknown URI " + uri);
}
return cursor;
}
I need to delete a specific row from table in my SQLite database.
This table contains paths to files.
And I need to delete paths, which contain specific extensions.
And I have troubles with this.
Nothing is deleted from my database.
For example my table name is ALL_PATHS and column name is PATH_NAME
This is the way I am doing this.
I'll be very glad for any help thanks
private void deletePath(String extension){
Database db = getWritableDatabase();
String query = "DELETE FROM " + ALL_PATHS + " WHERE lower(" + PATH_NAME + ") LIKE '%" + extension + "'";
Cursor cursor = db.rawQuery(query, null);
}
The error is:
Cursor cursor = db.rawQuery(query, null);
While it should be
db.execSQL(query);
Because DELETE is a command, not a query (SELECT)
use Content values
String table = "beaconTable";
String whereClause = "_id" + "=?";
String[] whereArgs = new String[] { String.valueOf(row) };
db.delete(table, whereClause, whereArgs);
I currently I have my database set up like the following:
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_LOCKERNUMBER
+ " TEXT NOT NULL, " + KEY_STATUS + " INTEGER, " + KEY_PIN
+ " INTEGER);");
And I am trying to write a method to get the pin code from the column for a specific locker number. Any ideas? I am very new I would like think I would need to use the query function and a cursor. I just one to get the integer value and store it into an int variable so I can compare the pin codes from what the user types in to the one in the database.
Queries to database returns in a Cursor object. You should use the db.query() method to get a row(s). Pass the table name, an array of columns you want to get (or null if you want all of them), pass a selection string that should be like "id = ?" or "key > ?", etc, then pass a String array containing the value for those ? inside the previous string,
and finally pass null for having, groupBy and orderBy unless you want to use them.
Cursor cursor = db.query(TABLE_NAME, new String[] { KEY_ROWID }, "id = ?", new String[] { Integer.toString(id) }, null, null, null);
After you get the Cursor, do cursor.moveToFirst() or cursor.moveToPosition(0) (can't remember the exact method, but the point is to move the cursor to the first retrieved row)
then you're going to iterate through the cursor with
while(cursor.moveToNext()) {
int keyRowIdColumnIndex = cursor.getColumnIndex(KEY_ROWID);
int yourValue = cursor.getInt(keyRowIdColumnIndex);
int keyLockNumberColumnIndex = cursor.getColumnIndex(KEY_LOCKNUMBER);
int pin = cursor.getInt(keyLockNumberColumnIndex);
}
This is a pretty straight forward task and there is a bunch of tutorials, examples, similar questions on SO:
How to perform an SQLite query within an Android application?
In general - you need to query the database passing your search arguments. See the documentation.
It will return you a Cursor with the matching results, which you can then iterate over and manipulate as you wish.
Fyi - storing password in a database table is a bad idea. On Android databases can be accessed and easily read. You either need to encrypt your data or think of another way to store it if it's important.
//Try This code
public String getLabeId(String LockNo)
{
ArrayList<String> Key_Pin_array = new ArrayList<String>();
Cursor cur = db.rawQuery("SELECT * FROM DATABASE_TABLE where KEY_LOCKERNUMBER = '" + LockNo + "'", null);
try {
while (cur.moveToNext())
{
System.out.println("Key_Pin" + cur.getString(3));
Key_Pin_array.add(cur.getString(3));
}
}
catch (Exception e)
{
System.out.println("error in getLabelID in DB() :" + e);
}
finally
{
cur.close();
}
return id;
}
I'm having kind of a problem here, since I just startet developing for Android. I downloaded the sample from the official Android website "http://developer.android.com/training/contacts-provider/retrieve-names.html", which is basically capable of retrieving an showing all the contacts from the phone. The feature I wanted to add is to just show contacts from a certain group like "Friends" (hardcoded).
As far as I narrowed it down I have to change the selection part
final static String SELECTION =
(Utils.hasHoneycomb() ? Contacts.DISPLAY_NAME_PRIMARY : Contacts.DISPLAY_NAME) +
"<>''" + " AND " + Contacts.IN_VISIBLE_GROUP + "=1";
to something like this
final static String SELECTION =
Contacts.GroupID = "Friends";
which gives me errors, because it can't find the column.
I'm very eager to explore the potential of Android, but that one is giving me headache.
There two ways for getting list of contacts of a group. First, I suppose you have GroupId and want to get related list of contacts.
String[] projection = {
ContactsContract.Groups._ID,
ContactsContract.Groups.TITLE,
ContactsContract.Groups.ACCOUNT_NAME,
ContactsContract.Groups.ACCOUNT_TYPE
};
return context.getContentResolver().query(
ContactsContract.Groups.CONTENT_URI, projection, ContactsContract.Groups._ID + "=" + groupId , null, null
);
Second way:
I suppose you want to get contacts of specific group by a constants name. so, it's enough you change above codes:
context.getContentResolver().query(
ContactsContract.Groups.CONTENT_URI, projection, ContactsContract.Groups.ACCOUNT_NAME + "='Friends'" , null, null
);
Now you have necessary details from specific Group. Then you can fetch list of Contact List:
public static Cursor getContactsOfGroup(Group group) {
// getting ids of contacts that are in this specific group
String where = ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID + "="
+ group.id + " AND "
+ ContactsContract.CommonDataKinds.GroupMembership.MIMETYPE + "='"
+ ContactsContract.CommonDataKinds.GroupMembership.CONTENT_ITEM_TYPE + "'";
Cursor query = context.getContentResolver().query(
ContactsContract.Data.CONTENT_URI,
new String[] {
ContactsContract.CommonDataKinds.GroupMembership.CONTACT_ID
}, where, null, ContactsContract.Data.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
String ids = "";
for (query.moveToFirst(); !query.isAfterLast(); query.moveToNext()) {
ids += "," + query.getString(0);
}
if (ids.length() > 0) {
ids = ids.substring(1);
}
// getting all of information of contacts. it fetches all of number from every one
String[] projection = new String[]{
"_id",
"contact_id",
"lookup",
"display_name",
"data1",
"photo_id",
"data2", // number type: 1:home, 2:mobile, 3: work, else : other
};
String selection = "mimetype ='" + ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE + "'"
+ " AND account_name='" + group.accountName + "' AND account_type='" + group.accountType + "'"
+ " AND contact_id in (" + ids + ")";
return context.getContentResolver().query(BASE_URI, projection, selection, null, null);
}
Notice, in second fetch in this method we check accountName and accountType to be sure this record is related this group, because may be there are some records that stored for another Apps like WhatsApp. and we don't like get those. ok?
I hope will useful for you.