I am trying to update a DATETIME column in a Sqlite table using the following query.
String query = "UPDATE myTable SET displayed = datetime('now') where _id = " + id;
database.rawQuery(query, null);
I have tested this on both device and emulator but its not working, its not updating the value in the column.
PS: I tried the same query in Sqlite browser and its working there.
Please help me figure out a solution.
Thanks.
Instead of using rawQuery(), use execSQL() if the execution doesn't return any data.
String query = "UPDATE myTable SET displayed = datetime('now') where _id = " + id;
database.execSQL(query);
Though just a tip, it is better to use UNIX time if you really want to store and process date in the future. It will be more flexible and standardized.
Related
I am creating a sql database in my app and I am following the documentation on the official developer guide of android, at the webpage
http://developer.android.com/training/basics/data-storage/databases.html#ReadDbRow.
I don't understand what is the meaning of the FeedEntry.COLUMN_NAME_UPDATED value.
What should is value be? What does it mean actually?
It's the name of the update column in the feed table ;)
// How you want the results sorted in the resulting Cursor
String sortOrder = FeedEntry.COLUMN_NAME_UPDATED + " DESC";
Cursor cursor = db.rawQuery("SELECT * FROM expenses WHERE expense_date > (SELECT DATE('now', '-7 day'));", null);
I have this above query to get all records that inserted in last 7 days. But as a result of this query i am getting all the records. The date column of these records is inserted via Android's DatePicker and they are in 30-Jul-2015 format. I guess that's why this query does not work properly. Is there a way to make them consistent to get this query work properly or i am missing out something else ? Any help would be appreciated.
I've never tried using the SQLite built in date functions. Taking a quick look at the SQLite date function documentation here, it would seem that to use them the date needs to be in the format YYYY-MM-DD, which would be why your query is failing.
You can do some string manipulation/formatting before saving to the db and use that format.
Personally, I usually format in that manner but without the dash separators, then a simple less than/greater than comparison can be used, treating the date like a regular number. Of course some conversion back and forth is necessary for display, but for under the hood it works great.
int now = 20150730;
String query = "SELECT * FROM expenses WHERE expense_date > '" + now-7 + "'";
I really need your help.
I have problem getting values from database. I have two editTexts and one Button. When I insert dates and press Button my table opens without data. How can I get for my database to read those editText values?
My code:
String val1=minDate.getText().toString();
String val2=maxDate.getText().toString();
Cursor c=database.rawQuery("SELECT * from TABLE WHERE DATE BETWEEN '"+ val1+"' AND '"+ val2+"' ", null);
Please refer to documentation:
http://developer.android.com/guide/topics/data/data-storage.html#db
To avoid SQL injection, never add parameter to query by concatenating values, To create a query please refer to: http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html#query%28java.lang.String,%20java.lang.String[],%20java.lang.String,%20java.lang.String[],%20java.lang.String,%20java.lang.String,%20java.lang.String%29
Security tip:
http://developer.android.com/training/articles/security-tips.html#ContentProviders
How date are stored in your table ? Which format ?
When you add parameter to your query format must be the same.
If you want to use BETWEEN key word, date must be stored in this format: year-month-date to be sorted by SQLite.
Update 1
You're right change date format to yyyy-mm-dd
You parameters in your query must have same format, of course.
Put query in variable and log it before, as this:
String query = "SELECT * from TABLE WHERE DATE BETWEEN '"+ val1+"' AND '"+ val2+"' ";
Log.d("MyQuery", query);
Cursor c=database.rawQuery(query, null);
Search in logcat TAG "MyQuery" and post value of query
Now replace your code with below and let me know what you got in Logs
Cursor cursor=database.rawQuery("SELECT * from TABLE WHERE DATE >='"+val1+ "' AND <= '"+val2+ "'", null);
if (cursor.moveToFirst()) {
do {
Log.i("cursor_Data",cursor.getString(cursor.getColumnIndex("Date")));
} while (cursor.moveToNext());
}
If above not work for you then please post your TABLE Structure?
I am using this query to fetch data from sqlite but only one condition is working but not two at same time.
I am also getting some notification that no such column but it exist.
String lquery = "SELECT SUM(totalcalorie) AS LTotal FROM fooditem
WHERE name = ('" + fname + "') AND foodtype = 'Lunch'";
you might be having null values on those places which you are checking while calling..
go through your code again queries seems write.
change totalcalorie to INTEGER type in the database schema
comment says that you are using TEXT
Running Android 4.1.2.
The following should work according to SQLite documentation.
String sql = "SELECT strftime('%m', MyDate) FROM MyTable";
Cursor c = database.rawQuery(sql);
c.moveToFirst();
String s = c.getString(0); // returns null
However, the returned data is always null. If I change the query to SELECT MyDate FROM MyTable then it does indeed return a valid date so I can assure you that my database contains correct data.
Q: Am I facing a bug in the rawQuery method or have I done something wrong?