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Assigning an object that is a foreign key via the constructor modifies primary key
In the end the problem was not where I expected it. I had defined a private parameterless constructor instead of a protected parameterless constructor. None of the MSDN samples (on EF6) mention this as their classes do not have a constructor (probably done to keep the code short). This prohibited the entity framework to generate proxy classes. Some side effect of this was apparently setting Id t

Categories : Sqlite

Sqlalchemy sqlite "too many SQL variables"
Try to delete the rows in different chunks. You can use limit(999) as maximum SQLITE_LIMIT_VARIABLE_NUMBER is equal to 999. This is pesudo of what you need to do from sqlalchemy import func, in_ # getting the amount of total rows stmt = select([func.count(child.c.parent_id).label('num_rows_childs')]).where(child.c.parent_id == parent_id) number_of_rows = conn.execute(stmt).fetchall() # Getting

Categories : Sqlite

Conditional selection of field values
Try to get winner or loser title in select clause instead of join conditions. select gam.winner, case when gam.winner=1 then t1.title else t2.title end as winner_title, case when gam.winner=2 then t1.title else t2.title end as loser_title from games gam left join teams t1 on gam.team1_id = t1.id left join teams t2 on gam.team2_id = t2.id

Categories : Sqlite

Enabling SQLite Foreign Keys without command
It would be possible to enable foreign key enforcement by default with the SQLITE_DEFAULT_FOREIGN_KEYS compilation option, but this would require recompiling the database (driver). Otherwise, you have no choice but to execute an SQL command.

Categories : Sqlite

SQLite in Unreal Engine 4
Accessing SQLite from Unreal Engine can be done either from the blueprint (I haven't done it), but, check the TappyChicken blueprint example, the SaveGame class can store / load many variables through any event you want. Also here is a good video on YouTube: http://www.youtube.com/watch?v=v0WRumU-gOk In regards to the code, I use https://github.com/afuzzyllama/DataAccess. Try it out. It can save

Categories : Sqlite

Error 175: The specified store provider cannot be found in the configuration, or is not valid. SQLlite
I am not sure that is correct, but I have pasted this line <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".NET Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite, Version=1.0.94.0, Culture=neutral, PublicKeyToken=db937bc2d44ff139"/> to C:WindowsMicrosoft.NETFrameworkv4.0.30319Configmachine.config and error disappe

Categories : Sqlite

How to update Core Data and maintain user-saved data?
Apple recommends that you separate static and user data, in this case into 2 persistent stores. You could do one of the following: First and preferable option, you use a separate store for the user data. You need to update the data model to accommodate two stores, so it will be a lightweight migration. You would then extract the user data on the first startup from the existing sqlite store and

Categories : Sqlite

JDBC SQLite PreparedStatement update and delete
Your intentions are good. It is always preferable to use parameters instead of dynamic ("glued together") SQL statements. However, parameters can only be used to represent the values in an SQL statement. So, this will NOT work String tableName = "Clients"; String columnToUpdate = "LastName"; String newValue = "Thompson"; String columnToSearch = "ID"; int idToMatch = 1; String sql = String.forma

Categories : Sqlite

How to properly sync Xamarin iOS Sqlite using Azure Mobile Services
You should use PullAsync instead of ReadAsync. Also, you need to await the call to all of your async method calls, such as InsertAsync, PushAsync, and PullAsync. See this tutorial for a detailed example: http://azure.microsoft.com/en-us/documentation/articles/mobile-services-xamarin-ios-get-started-offline-data/

Categories : Sqlite

Script for Generate Databases in Powershell
This will filter out any folders that have a *.db file in them somewhere. Without more knowledge of the logic of your Python script, it's not really possible to be more accurate. Get-ChildItem -Directory -Path 'C:Year_2015' | Where-Object { (Get-ChildItem -File -Recurse -Path $_.FullName -Filter '*.db').Count -eq 0 } | ForEach-Object { Clear-Host; Push-Location $_.FullName; C:T

Categories : Sqlite

how to make sqlite temporary data files .shm,.wal to be in user ownership rather than root
I have found out the workaround to my problem. If we do data opening/locking operation as the user who owns the main data file from inside C code by using setuid(), then these temporary data files will be generated with the same ownership as the main database file.

Categories : Sqlite

FireDAC: Saving Time to SQLite DB
I don't have the same environment to test, so the results might differ for you, but in Delphi XE3 with an older version of AnyDAC I ran this simple test: ADQuery.Close; ADQuery.SQL.Text := 'CREATE TABLE MyTable (Col NUMERIC)'; ADQuery.ExecSQL; ADQuery.Close; ADQuery.SQL.Text := 'INSERT INTO MyTable (Col) VALUES (:Val)'; ADQuery.Params[0].Value := TTime(EncodeTime(1, 2, 3, 4)); ADQuery.ExecSQL;

Categories : Sqlite

sqlite get data from one field on two different dates and present as two columns
You want a correlated subquery: SELECT ..., p.adjclose AS curpx, (SELECT p2.adjclose FROM prices AS p2 WHERE p2.date = datetime(h.date, '-1 days') AND p2.instrument = h.instrument ) AS lastpx FROM ...

Categories : Sqlite

Creating a Windows 8.1 Tablet App with a Local Database that links back to SQL Server
If you do not need to be the app to be a Windows Store app, you can use sqlce. Rob Tiffany has a book that describes how to do that. If it must be a Store app you must use sqlite. You can use Zumero for Sync in that case.

Categories : Sqlite

find user sessions by grouping nearby timestamps
To compute where a row is the first row in a session, check whether any other row exists in the previous 30 minutes: SELECT *, NOT EXISTS (SELECT 1 FROM actions AS prev WHERE userid = actions.userid AND timestamp < actions.timestamp AND timestamp >= datetime(actions.timestamp, '-30 minutes')

Categories : Sqlite

sql-lite take info from rows and paste that to a single colum
Use group_concat: SELECT 'LO: ' || group_concat(Plaats, '/ ') FROM (SELECT DISTINCT [Plaats**] AS Plaats FROM bron -- ORDER BY ... ) To write this value to all rows, use an UPDATE statement like this: UPDATE bron SET [OR] = (SELECT 'LO: ' || group_concat(Plaats, '/ ') FROM (SELECT DISTINCT [Plaats**] AS Plaats FROM bron -- ORDER

Categories : Sqlite

Gnuplot with data from sqlite3 (using multiple columns)
Directly behind the word plot, a source, e.g. a filename is needed expected, not the data itself. However, you can use the special filename "-" and gnuplot will ask you to enter a table manually. It looks like this: gnuplot> plot "-" u 1:2 w l input data ('e' ends) > ID tempin tempout humidity date time 1 24 12 55 01.11.2014 07:00 2

Categories : Sqlite

SQLite: How to select only the filename without extension?
SQLite has no built-in string functions that would help with this. It would be possible to create a recursive CTE, but the easiest way is to retrieve the entire file name and to remove the extension in your code.

Categories : Sqlite

Yii - protected - (403 Forbidden Error)
It is possible since the protected folder is only protected by a .htaccess file. If you eliminate the "defensive rules" and have the right directory/file permissions, the protected folder can be easily made accessible from outside. However I strongly recommend not to do this, because direct access to the protected folder (as it name suggests) should be made inaccessible for standard users.

Categories : Sqlite

SQLite count(*) in while clause
In the first query, the subquery does not refer to the row in n1. You need a correlated subquery: SELECT fld_Date FROM Calendar AS n1 WHERE fld_WorkDay = 1 AND (SELECT COUNT(*) FROM Calendar AS n2 WHERE fld_Date BETWEEN '2014-11-07' AND n1.fld_Date AND fld_WorkDay = 1 ) = 5 LIMIT 1 The subquery is extremly inefficient if there is no index on the fld_Date column.

Categories : Sqlite

Merging fields in SQlite with dynamic range - HOW?
SQLite has the GROUP_CONCAT() aggregate function. SELECT group, subgroup, GROUP_CONCAT(value) AS "value" FROM MyTable GROUP BY group, subgroup If you need to control the order of values, you'll need to use a subquery like this.

Categories : Sqlite

Sqlite Turkish character conversion
I found a way that solves that problem. I hope that helps :) SELECT "Countries"."countryName", "Countries"."countryCode", "Countries"."telephoneCode", "Countries"."isIbanMantadatory" FROM "Countries" WHERE (Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace(Replace("Countries"."countryName", "Ü", "u"), "ü", "u"), "G", "g"), "g", "g"), "S", "s"), "s

Categories : Sqlite

Is it possible to filter a SQLite query so that each value appears only once in each column
I suggest to add a column with ID. Then do this: select a, b from mytable m1 where a not in (select m2.a from mytable m2 where m2.id < m1.id) and b not in (select m3.b from mytable m3 where m3.id < m1.id) If you don't want to decide by the order of IDs, you can add another column (like a sequence).

Categories : Sqlite

how to create a dynamic database ?
I understand that you'd like to use SQLite. Run SQLite client (Sqliteman or similar), create a new database and run the below as a script: create table category ( category_id integer not null primary key, name varchar(80) not null ); create table meal ( meal_id integer not null primary key, name varchar(80) not null, directions text ); create table meal_category ( meal_category_id int

Categories : Sqlite

Do I need an 'order' column in my sqlite table or is it safe to use rowid?
In SQLite, the rowid is equivalent to an integer primary key. In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the ROWID (except in WITHOUT ROWID tables) which is always a 64-bit signed integer. In your application, it makes sense for the database to prevent reuse of row id numbers. SQLite might reuse rowids the way you're using it right now. If you ever delete rows

Categories : Sqlite

SQLite vacuuming / fragmentation and performance degradation
SQLite automatically reuses free pages. Fragmented pages can result in performance degradation only if the amount of data is so large that it cannot be cached, and your storage device does seeks relatively slowly (e.g. hard disks or cheap flash devices), and you access the data often enough that the difference matters. There is only one way to find out whether this is the case for your applic

Categories : Sqlite

Does matchinfo function works in query containg multiple SELECT statements?
The problem is the structure of your sub-queries. When you use a SELECT to get a list of items to check against with an IN, SLQ expects a simple 1 dimensional result (ie {'a','b','c'}). Since you have multiple terms in your inner SELECT queries, the IN statement is getting a list of complex results (ie. {{'a', 1},{'b',2},{'c',3}} ). If you want to use inner SELECTS this way and you don't need the

Categories : Sqlite

How can I create a OneToOne relationship using Sqlite Extensions
The problem raises because all the relationship attributes inherit from SQLite-Net Ignore attribute. If you use a different SQLite-Net version it won't recognize the Ignore attribute and it will try to persist the annotated properties, causing it to crash with the error that you are seeing. Long story short: you are probably using the annotations from one SQLite-Net Extensions and the database co

Categories : Sqlite

MVVMCross for New Cross-Platform Project?
Collectively, these questions really are not that suitable for stackoverflow... I suspect you may have better luck: asking individual technical questions that are well-defined and that you've already researched (see http://codeblog.jonskeet.uk/2010/08/29/writing-the-perfect-question/) trying social forums and real-world meetups to get opinions and experiences. investing your own time in order to

Categories : Sqlite

Importing Excel .csv to SQLite
did you try "parse_dates" when importing your CSV? like this: In [53]: df = pd.read_csv('foo.csv', index_col=0, parse_dates=True) In [54]: df Out[54]: A B C date 2009-01-01 a 1 2 2009-01-02 b 3 4 2009-01-03 c 4 5

Categories : Sqlite

SQLite3 trigger does not work
If you need to quote table names and column names, use double quotes, not single quotes. CREATE TRIGGER 'delete_expired' BEFORE INSERT ON visitor BEGIN DELETE FROM visitor WHERE create_at <= date('now', '-6 day'); END; Single quotes usually denote a literal string. sqlite> select 'create_at' from visitor; create_at In an interactive session . . . sqlite> create table visitor (cre

Categories : Sqlite

18 digit timestamp to Local Time
It looks to me like it's based at 1970 (the Unix epoch) instead of 1900, with 256000000 "ticks" per second. I haven't seen such a format before, but it seems to check out - for example, using Noda Time: using System; using NodaTime; class Test { static void Main() { Console.WriteLine(ToInstant(362087323333655740)); } static Instant ToInstant(long value) { //

Categories : Sqlite

Viewing blob data as a hexdump with ASCII in the sqlite3 console
You can run the below script in the command. sqlite3 test.db "select hex(obj) from data where rowid=1" >> hexdump :) I'm not sure if it's what you need.

Categories : Sqlite

SQLite: replace part of a string with another one
You can use replace function UPDATE table SET tel= replace( tel, '0511', '0513' ) WHERE tel LIKE '0511%'; Check the SQLite core functions here EDIT In case you have a match after the first 4 digits of your tel number. For example 051121505113 UPDATE table SET tel= replace(substr(tel,1,5), '0511', '0513' )||substr(tel,5) WHERE tel LIKE '0511%';

Categories : Sqlite

How to display 0 in count?
This may help you select s.sname,(select count(*) from boat b where s.rating >= b.rating ) t from sailor s order by t desc; SQLFIDDLE

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Detect overlapping events
There is a conflict if there exists any other event that overlaps the current event: SELECT *, EXISTS (SELECT 1 FROM events AS other WHERE other.event_id != events.event_id AND other.end > events.start AND other.start < events.end) AS conflict FROM events

Categories : Sqlite

sqlite, select second smallest in each group
If you instead join to the subquery on the customer number you'll be sure the dates match up with the appropriate customer number. With your second attempt you didn't have that certainty. SELECT h.Cust_Num, MAX(d.Date) FROM heroes h JOIN ( SELECT Cust_Num, Date FROM heroes ORDER BY Date LIMIT 2 ) d ON d.Cust_Num = h.Cust_Num GROUP BY h.Cust_Nu

Categories : Sqlite

Get back the second latest date per ID instead of the latest
Using any other day/month than 1/1 will foul up the date string comparisons; you should use a date format like yyyy-mm-dd instead. Assuming that you have working date comparisons, you can either remove all the maximum rows with a compound query, then group over the rest: SELECT searchID, hit, MAX(time) FROM (SELECT searchID, hit, time FROM results EXCEPT SELECT searchID, hit, M

Categories : Sqlite

Can I use blocking API on WinRT?
There are a few requirements your app has to meet. The three most important ones regarding your question (imho) are these: Your app has 5 seconds to start on the splash screen. If your database setup takes longer, consider using an extended splash screen or a background task. The app must render the first screen or a splash screen within 5 seconds after launch. Your app must be responsive

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