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Lazarus - an IDE and GUI toolkit for use with Free Pascal. This is an unofficial mirror of the Lazarus SubVersion repository and is for convenience use only. It is synced every 15 minutes. Aliotti, Can you explain where you got hthe oledb.pas file from? Before I include it I need to be sure inclusion is legal. Can you tell me if this is.
Lazarus, a Free Pascal based free and open source cross-platform Delphi look-a-like software development tool, has been around for a while now and has become more and more mature. I actually used with it some of my experiments ( for example) to develop cross-platform applications.In this article I’ll show you how to get started with the use of in your Lazarus applications.
SQLite is an open source super compact embedded SQL engine which allows you to use an SQL database with your applications without the need to actually run a full-size SQL database server.Some knowledge of SQL, Lazarus Pascal and databases is assumed. SQLiteTypical use of SQLite is when you’d like to use an SQL database to store application data without the need to run a large SQL database like for example (my favorite). Installation or distribution of SQLite with your Lazarus applicationSQLite also needs to be installed. Well maybe installed is not the right way to say this as it typically involves one single file that you can include in the distribution of your application.Getting started however is slightly different for each Operating System – and frankly it took me a while to figure it all out (hence this article). Getting started with SQLite under MacOS XMacOS X comes with SQLite pre-installed since Apple uses it for applications like Apple Mail, Safari, etc.
So the easiest way, is to use the version of SQLite that can be found on every Mac.Just drop the TSQLite3Connection component from the SQLdb tab on your main form and that’s all you have to do.In code I’d add the path to the SQLite library though it may or may not be needed. Procedure TForm1. Procedure TForm1. Download inside out torrent. FormCreate (Sender: TObject );beginSQLiteLibraryName: = 'sqlite3.dll';SQLite3Connection1. Open;end;Now that we have our connection ready we need to add a TSQLTransaction component to our form as well (also found onder the SQLdb component tab) and connect it to the TSQLite3Connection component by setting it’s “ Database” property to the TSQLite3Connection we added earlier.Now we can do the usual adding of the usual Queries and Tables (all use the TSQLQuery component) – you will, even for tables, have to enter the proper query to retrieve data in the “SQL” property of the TSQLQuery component. For a simple table for example.
SELECT. FROM movies ORDER BY filename;Don’t forget that for data-aware components you’ll also need to add TDataSource for each query that will be accessed through these data-aware components. TDataSource can be found under the “ Data Access” component tab. Step 4 – Dump SQL for databaseIn this step your application should already be good to go.I always like to have the application create it’s database when it’s missing and for this I need all SQL statements to create tables etc. Database LocationYou’re free to determine where the database file of your application should be.
SELECTCAST ( 'Filename' AS VARCHAR ) AS 'Filename','Date'FROM'mytable';You will now see that the actual text is being displayed and not the “(memo)” text. Option 2 (when option 1 fails) – OnGetText EventThis works only at Runtime, and takes a little bit more work.First we need to add fields to our TQuery.Right click the TQuery and select “Edit Fields”.In the upcoming window click the “+” button to at least add the field that shows as “(memo)”.Now click the newly added field. You’ll see that a TMemoField has been added in the object inspector.Click the “Events” tab in the object inspector and double click the “OnGetText” event.Now add this code to the event handler (assuming: TQuery = qrySomeQuery, fieldname = “SomeField”, which creates the TMemoField called “qrySomeQuerySomeField”).
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Procedure TForm1. QrySomeQuerySomeFieldGetText (Sender: TField; var aText: string; DisplayText: Boolean );beginaText: = Sender. AsString;DisplayText: = true;end;Resetting Auto Increment FieldsWhen flushing tables in SQLite, or removing a lot of records, you might want to reset the auto increment fields counter (1 or the next available unused number).The following SQL statement does this for ALL tables (yes: it’s safe to do this, records of your tables will not be deleted or modified!). Procedure TForm1. SQLiteVacuum (db:TSQLite3Connection );var tmpDataset: TSqlite3Dataset;wasConnected: boolean;beginwasConnected: = db.
![Adodb Adodb](/uploads/1/2/7/6/127608093/192928709.png)
Close;repeatuntil not db. Connected;tmpDataset: = TSqlite3Dataset. Create ( nil );tmpDataset. FileName: =db. ExecSQL ( 'VACUUM;' );tmpDataset.
Connected: =wasConnected;end;Order Text as NumbersWhen trying to sort text as number in SQLite, you’ll run into some issues where it does not sort numerical.With a little trick we can order text numerically, for fields with numbers in it.In my example, I had a field “ videomode” with values like “ 480p”, “ 720p”, “ 1080p” and “ 2160p”.The normal sorting by using “ ORDER BY videomode” will fail and result in: 1080p2160p480p720pNot exactly numerical (a.k.a. Thanks for pointing that out reading the database appears possible by multiple apps/users.I did not know that.Writing/Changing data however is not an option (from your link).“ Multiple processes can have the same database open at the same time. Multiple processes can be doing a SELECT at the same time. But only one process can be making changes to the database at any moment in time, however.“You will also notice that most applications refuse to connect when another app is connected to a database. Like some of the SQLite Database Managers.hans.
Hi Aidv!First thing I noticed: the path you mention would be for the wrong target (we need ARM or ARMHF instead of i386 instead).Anyhow, the steps I followed are:To install SQLite 3, from a shell: sudo apt-get install sqlite3 libsqlite3-devNext step was to start Lazarus and install the package sqlite3laz 0.4Do not install any other SQLite packages – I’ve noticed that they might conflict.Next click “Save and Rebuild IDE” – this will take a while as you might have noticed. This, as you can guess, worked fine in my setup.Note that “libsqlite3.so” can now be found int “/usr/lib/arm-linux-gnueabihf”.Just to test if it worked well, I dropped a SQLite3DataSet on a new form and it ran just fine (obviously, you’ll always see that, haha).hans. Hi Daren,Thanks for the compliment and you’re most welcome!I’ve never seen this error – even when I compiled the same package.Doing some searching on the Internet, I did not find a good answer either.Some say it might be related to the compiler parameters. It could also be that the package was compiled with different compiler parameters.
But I’ll admit that all this is me guessing based on what I have read on the and it might not be very helpful Unfortunately, as I’m in the middle of a move, I do not have my Raspberry Pi available to do some tests.I hope to be able to dig it up out of my stuff one of these days, and I’ll give it a try then – unless you found a solution in the meanwhile.hans.
Welcome to LazarusLazarus is a Rapid Application Development Tool for Free Pascal.It comes with the LCL - Lazarus component library, which contains platformindependent visual components like buttons, windows, checkbox, treeview andmany, many more.
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