Welcome, Guest

Page:
1

TOPIC:

SQLite implementation 25 Jun 2021 19:09 #18915

OhioJoe
Topic Author

Offline

Posts: 123

Trying to compile in XIDE. Getting the following build error:

error XS0009: Metadata file 'C:\XIDE\Assemblies\SQLite.Interop.dll' could not be opened -- PE image doesn't contain managed metadata.

I'm acting upon the advice offered by Wolfgang in another post. In which he said I need to include the following:

SQLite.Interop.dll
System.Data.SQLite.dll

As the error above indicates, I've copied them into the XIDE\Assemblies folder

The ultimate goal here is to build an app that works with all SQL dialects. Buf first I'm trying to get it working in an environment that leaves the user free of having to install a separate database server. Hence the choice for SQLite.

Any advice out there? Thank you.

Joe Curran
Ohio USA

Please Log in or Create an account to join the conversation.

SQLite implementation 25 Jun 2021 21:00 #18916

robert

Offline

Posts: 3599

Joe,
You only need to include System.Data.SQLite as a reference. The other DLL must be copied to the EXE folder but is not a .Net DLL but a "normal" C++ DLL.

Robert

XSharp Development Team
The Netherlands

Please Log in or Create an account to join the conversation.

SQLite implementation 25 Jun 2021 21:13 #18917

OhioJoe
Topic Author

Offline

Posts: 123

I eliminated the reference to SQLite.Interop.dll. Now it compiles
When I run the application, it says that I need an ODBC connection, which is what I'm trying to avoid. (To achieve the fewest possible user-setup requirements.)
Here's my connection syntax, originally written in VO:

oDatabase := cDBFile  // "joe.db"
SQLConnectErrorMsg( TRUE )  
oConnection := SQLConnection{"SQLite3", "", "" }	    
oConnection:connect()

// and then later on:
cStatement := "ATTACH DATABASE '" + cDatabase+ "' AS joedata" 
oStatement := SQLStatement{cStatement , oConnection}
oStatement:Execute()
oStatement:FreeStmt( SQL_DROP )

What is the correct way to connect?

Joe Curran
Ohio USA

Please Log in or Create an account to join the conversation.

SQLite implementation 25 Jun 2021 21:46 #18918

robert

Offline

Posts: 3599

Joe,
This code seems to use the VO compatible SqlConnection and SqlStatement.
You will have to use the Ado.Net compatible classes:

VAR db := SQLiteConnection{"Data Source="+cDatabase+";Version=3;"}
db:Open()  
USING VAR cmd := SQLiteCommand{"SELECT * from Table", oConn}
USING VAR rdr := cmd:ExecuteReader()
DO WHILE rdr:Read()
   ....
ENDDO

XSharp Development Team
The Netherlands

Please Log in or Create an account to join the conversation.

SQLite implementation 25 Jun 2021 21:55 #18919

OhioJoe
Topic Author

Offline

Posts: 123

Robert, you also mentioned that SQLite.Interop.dll is to be placed in the EXE folder. Is there a line where this is to be referenced in the app, such as
LoadLibrary("SQLite.Interop.dll")
?
Thank you, Robert.

Joe Curran
Ohio USA

Please Log in or Create an account to join the conversation.

SQLite implementation 25 Jun 2021 22:53 #18921

Chris

Offline

Posts: 3981

Joe, no need at all to load it in your code manually yourself. I assume this dll is used automatically from inside the code in the System.Data.SQLite.dll

XSharp Development Team
chris(at)xsharp.eu

Please Log in or Create an account to join the conversation.

SQLite implementation 26 Jun 2021 09:19 #18922

lumberjack

Offline

Posts: 721

Hi Joe,

OhioJoe wrote: The ultimate goal here is to build an app that works with all SQL dialects. Buf first I'm trying to get it working in an environment that leaves the user free of having to install a separate database server. Hence the choice for SQLite.
Any advice out there? Thank you.

If you want to save yourself a lot of effort you need to go the DbProviderFactories route. Here is some code that should get you on track:

    STATIC METHOD GetConnection(sDb AS STRING) AS DbConnection
        LOCAL cs AS ConnectionStringSettings
        LOCAL oConn AS DbConnection
        cs := ConfigurationManager.ConnectionStrings[sDb]
        oConn := DbProviderFactories.GetFactory(cs:ProviderName):CreateConnection()
        oConn:ConnectionString := cs:ConnectionString
    RETURN oConn

    STATIC METHOD GetData(sDb AS STRING, sComm AS STRING) AS STRING
        LOCAL obj AS OBJECT
        LOCAL oConn AS DbConnection
        LOCAL oComm AS DbCommand
        LOCAL oTran AS DbTransaction
        LOCAL oRead AS DbDataReader
        LOCAL ret, sDel AS STRING
        oConn := PsionUtils.GetConnection(sDb)
        oConn:Open()
        oComm := DbProviderFactories.GetFactory(ConfigurationManager.ConnectionStrings[sDb]:ProviderName):CreateCommand()
        oComm:Connection := oConn
        oComm:CommandText := sComm
        oTran := oConn:BeginTransaction()
        oComm:Transaction := oTran
        oRead := oComm:ExecuteReader()
        ret := ""

        WHILE oRead:Read()
            IF ret:Length > 0
                ret += ";"
            ENDIF
            sDel := ""
            FOR LOCAL col := 0 AS INT UPTO oRead:FieldCount -1
                ret += sDel + oRead:GetValue(col):ToString()
                sDel := ","
            NEXT
        ENDDO
        oRead:Close()
        oTran:Commit()
        oConn:Close()
    RETURN ret

    STATIC METHOD DataRead(sDB AS STRING, sComm AS STRING) AS DataTable
        LOCAL oConn AS DbConnection
        LOCAL oComm AS DbCommand
        LOCAL oTran AS DbTransaction
        LOCAL oRead AS DbDataReader
        LOCAL oDT AS DataTable
        oConn := PsionUtils.GetConnection(sDB)
        oConn:Open()
        oComm := DbProviderFactories.GetFactory(ConfigurationManager.ConnectionStrings[sDB]:ProviderName):CreateCommand()
        oComm:Connection := oConn
        oComm:CommandText := sComm
        oTran := oConn:BeginTransaction()
        oComm:Transaction := oTran
        oRead := oComm:ExecuteReader()
        oDT := DataTable{}
        oDT:Load(oRead)
        oConn:Close()
        oConn:Dispose()
    RETURN oDT

    STATIC METHOD PutData(sDb AS STRING, sComm AS STRING) AS INT
        LOCAL oConn AS DbConnection
        LOCAL oComm AS DbCommand
        LOCAL oTran    AS DbTransaction
        LOCAL ret := 0 AS INT
        LOCAL stmt AS STRING[]
        oConn := PsionUtils.GetConnection(sDb)
        oComm := DbProviderFactories.GetFactory(ConfigurationManager.ConnectionStrings[sDb]:ProviderName):CreateCommand()
        oComm:Connection := oConn
        oConn:Open()
        oTran := oConn:BeginTransaction()
        oComm:Transaction := oTran
        stmt := sComm:Split(";":ToCharArray(), StringSplitOptions.RemoveEmptyEntries)
        FOREACH s AS STRING IN stmt
            oComm:CommandText := s
            ret += oComm:ExecuteNonQuery()
        NEXT
        oTran:Commit()
        oTran:Dispose()
        oComm:Dispose()
        oConn:Close()
        oConn:Dispose()
    RETURN ret
END CLASS

**ApplicationName.exe.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.data>
        <DbProviderFactories>
            <add name="Npgsql Data Provider" invariant="Npgsql" description=".Net Framework Data Provider for Postgresql" type="Npgsql.NpgsqlFactory, Npgsql" />
            <!--    /-->
        </DbProviderFactories>
    </system.data>
    <connectionStrings>
        <add name="logtrack" providerName="System.Data.OleDb" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\VIDE\Projects\visualSystem\Applications\psion\logtrackssc.mdb;"/>
        <add name="ddframework"  providerName="Npgsql" connectionString="Server=127.0.0.1;Port=5432;Database=visualframe;User Id=postgres;password=************" />
    </connectionStrings>
</configuration>

Let me know if there is something you don't understand.

HTH

______________________
Johan Nel
Boshof, South Africa

Please Log in or Create an account to join the conversation.

SQLite implementation 26 Jun 2021 14:46 #18923

OhioJoe
Topic Author

Offline

Posts: 123

Thank you. Yes, this fits!
Just started with the reading about ADO.Net
Included there is a section about DBProviderFactories
Hopefully my experience here will help those who've been stuck in the DBF world, who want to create a version of their feature-rich application to an expanded user base, but who don't know where to start.

Joe Curran
Ohio USA

Please Log in or Create an account to join the conversation.

SQLite implementation 26 Jun 2021 14:51 #18924

lumberjack

Offline

Posts: 721

Hi Joe,

OhioJoe wrote: Thank you. Yes, this fits!
Just started with the reading about ADO.Net
Included there is a section about DBProviderFactories
Hopefully my experience here will help those who've been stuck in the DBF world, who want to create a version of their feature-rich application to an expanded user base, but who don't know where to start.

Feel free to contact me if you need any assistance.

Regards

______________________
Johan Nel
Boshof, South Africa

Please Log in or Create an account to join the conversation.

SQLite implementation 16 Sep 2021 22:42 #19617

OhioJoe
Topic Author

Offline

Posts: 123

Robert / Johan:
(Just now getting back to this. Sorry for the delay.)
What assemblies / references are required to implement your code?
When I tried Robert's sample ...

VAR db := SQLiteConnection{"Data Source=c:\fr\fptest.db;Version=3;"}
db:Open()  
USING VAR cmd := SQLiteCommand{"SELECT * from Table", db}
USING VAR rdr := cmd:ExecuteReader()
WHILE rdr:Read()
ENDDO

... I got the following error:

error XS0246: The type or namespace name 'SQLiteConnection' could not be found (are you missing a using directive or an assembly reference?)

Thank you for your help

Joe Curran
Ohio USA

Please Log in or Create an account to join the conversation.

SQLite implementation 17 Sep 2021 03:35 #19618

Jamal

Offline

Posts: 309

Joe,

Add a reference to System.Data.SQLite

then in your code add:

USING System.Data.SQLite

Jamal

Please Log in or Create an account to join the conversation.

SQLite implementation 17 Sep 2021 13:23 #19619

ic2

Offline

Posts: 1667

Hello Joe,

In addition to what Jamal wrote: I think you need to install an SQLite first (note: with 1 'L'). I used it for a never finished Windows modern app and found SQLite.Net PCL . There's also a Microsoft.Data.Sqlite on NuGet.

You can obtain them via Via Tools/NuGet Package Manager, Manage NuGet Packages for Solution; select Browse at the top, and search for SQLite.Net PCL or Microsoft.Data.Sqlite. Then add the reference as Jamal writes.

You might want or need to read stackoverflow.com/questions/48439865/how...studio-2017/55083869.

Dick

Please Log in or Create an account to join the conversation.

SQLite implementation 17 Sep 2021 14:44 #19620

OhioJoe
Topic Author

Offline

Posts: 123

Thank you guys.
(Dick, I've checked my SQLite installation and it seems OK)
I took Robert's code and pasted it into a function. Added the USING statement. (Already had the reference to System.Data.SQLite)

FUNCTION XTester( nChoice AS INT, cDB AS STRING ) AS VOID STRICT 
	USING System.Data.SQLite 
	VAR db := SQLiteConnection{"Data Source=" + cDB + ";Version=3;"} 
	db:Open()  
	USING VAR cmd := SQLiteCommand{"SELECT * from Master", db}
	USING VAR rdr := cmd:ExecuteReader()
	WHILE rdr:Read()
	ENDDO          

	RETURN

Now I get this XIDE error:

error XS9002: Parser: unexpected input 'VAR'	350,2	Start_Start.prg	XTester

I think it has something to do with the placement of the USING statement.
Anyone? Thank you.

Joe Curran
Ohio USA

Please Log in or Create an account to join the conversation.

SQLite implementation 17 Sep 2021 14:45 #19621

robert

Offline

Posts: 3599

Joe,
Usings should not be inside a function/method body but at the start of the page.

Robert

XSharp Development Team
The Netherlands

Please Log in or Create an account to join the conversation.

SQLite implementation 17 Sep 2021 14:55 #19622

Jamal

Offline

Posts: 309

Joe,

The USING statement should on top and outside of your methods:

USING System.Data.SQLite 

FUNCTION XTester( nChoice AS INT, cDB AS STRING ) AS VOID STRICT 
	
	VAR db := SQLiteConnection{"Data Source=" + cDB + ";Version=3;"} 
	db:Open()  
	USING VAR cmd := SQLiteCommand{"SELECT * from Master", db}
	USING VAR rdr := cmd:ExecuteReader()
	WHILE rdr:Read()
	ENDDO          

	RETURN

FYI: www.xsharp.eu/help/using.html

Also, I think that the USING statements inside the function that are used with variables should be written as:

BEGIN USING .. END USING

so that variables are disposed of properly.

FUNCTION XTester( nChoice AS INT, cDB AS STRING ) AS VOID STRICT 
	
	BEGIN USING VAR db := SQLiteConnection{"Data Source=" + cDB + ";Version=3;"} 
	    db:Open()  
	    BEGIN USING VAR cmd := SQLiteCommand{"SELECT * from Master", db}
	         BEGIN USING VAR rdr := cmd:ExecuteReader()
	                WHILE rdr:Read()
	                ENDDO          
                 END USING
            END USING
        END USING

RETURN

Jamal

Please Log in or Create an account to join the conversation.

Last edit: by Jamal.

SQLite implementation 17 Sep 2021 15:10 #19623

wriedmann

Offline

Posts: 3366

Hi Joe,
if you need to use SQLite and to distribute it, you need the following in the binaries folder
System.Data.SQLite.dll
x64\SQLite.Interop.dll
x86\SQLite.Interop.dll

That is all. If your application is running in 32 bit mode, the interop is loaded from the x86 folder, otherwise from the x64 folder.

You don't need any installation. Microsoft calls this "xcopy installation".

Wolfgang
P.S. since I use XIDE, I have to do some things manually

Wolfgang Riedmann
Meran, South Tyrol, Italy

www.riedmann.it - docs.xsharp.it

Please Log in or Create an account to join the conversation.

SQLite implementation 17 Sep 2021 16:06 #19624

OhioJoe
Topic Author

Offline

Posts: 123

Thank you, Wolfgang. It turns out your comment could be very well-timed because the problem below might have something to do with 32 vs 64. (I think I'm in 32-bit mode but I can't find where to check.)

It compiled. Then I got the following runtime error:

System.DllNotFoundException: Unable to load DLL 'SQLite.Interop.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
   at System.Data.SQLite.UnsafeNativeMethods.sqlite3_config_none(SQLiteConfigOpsEnum op)
   at System.Data.SQLite.SQLite3.StaticIsInitialized()
   at System.Data.SQLite.SQLiteLog.Initialize(String className)
   at System.Data.SQLite.SQLiteConnection..ctor(String connectionString, Boolean parseViaFramework)
   at System.Data.SQLite.SQLiteConnection..ctor(String connectionString)
   at FRW.Exe.Functions.XTester(Int32 nChoice, String cDB) in C:\XIDE\Projects\FPSQLite\FRW\Start_Start.prg:line 350
   at XAPP.StartInitProg(__Usual[] Xs$Args) in C:\XIDE\Projects\FPSQLite\FRW\Start_Start.prg:line 127
   at XAPP.Start(__Usual[] Xs$Args) in C:\XIDE\Projects\FPSQLite\FRW\Start_Start.prg:line 40
   at FRW.Exe.Functions.Start() in C:\XIDE\Projects\FPSQLite\FRW\Start_Start.prg:line 7

So I added a reference to C:\Program Files (x86)\XSharp\Extension\Project\SQLite.Interop.dll

and then got the following compiler error:

error XS0009: Metadata file 'C:\Program Files (x86)\XSharp\Extension\Project\SQLite.Interop.dll' could not be opened -- PE image doesn't contain managed metadata.

Adding the reference left a copy of SQLite.interop.dll in my DEBUG folder. So I REMOVED the reference to SQLite.Interop.DLL ...

... and then it compiled and ran. With the copy of SQLite.interop.dll in the DEBUG folder but without the reference.

??

My goal here is to follow up on the work I've done previously to convert a large VO app from DBF to SQLite and show everyone else that it's not so hard. (And it isn't. Once I can get these quirks worked out. Thank you for your help.)

Joe Curran
Ohio USA

Please Log in or Create an account to join the conversation.

SQLite implementation 17 Sep 2021 16:33 #19625

wriedmann

Offline

Posts: 3366

Hi Joe,
SQLite.Interop.DLL is not a .NET DLL, so you cannot add that to the references.
You have to copy both folders (x64 and x86) to your binaries folder, and the System.Data.SQLite.DLL will load the correct when needed.
This is not a thing that only SQLite does, CEFSharp does the same (it is a embedded Chrome browser I've played with), and also Microsoft's WebView2 control (an embedded Edge webbrowser control).
Wolfgang

Wolfgang Riedmann
Meran, South Tyrol, Italy

www.riedmann.it - docs.xsharp.it

Please Log in or Create an account to join the conversation.

SQLite implementation 18 Sep 2021 08:59 #19626

ic2

Offline

Posts: 1667

Adding to Wolfgang's comment, for future readers, who would want to work with WebVIew2 (as we do):

You need to have a subdirectory installed in your program directory called runtimes\win-x86\native with WebView2Loader.dll in it + a couple of DLL's (Microsoft.Web.WebView2.Wpf.dll , Microsoft.Web.WebView2.Core.dll, Microsoft.Web.WebView2.Core.xml, and Microsoft.Web.WebView2.Wpf.xml) .And the WebView2 must be installed, in VO we have this line of code:

ShellExecute(NULL, String2Psz("open"), String2Psz("go.microsoft.com/fwlink/p/?LinkId=2124703"), NULL_PSZ, NULL_PSZ, SW_SHOW) // Installation URL for Evergreen bootstapper from developer.microsoft.com/en-us/microsoft-edge/webview2/

The WebView2 is used from our .Net library for VO, a mix of C# and X# code.

I am not sure if the last step is necessary in WIndows 10, since March Microsoft auto installs WebvView2 with WIndows 10 since Office 365 also relies on it. Originally it would only be be auto installed if you run Office 365 2101 or later.

Dick

Please Log in or Create an account to join the conversation.

Page:
1

Forum

Public Forums

Examples

SQLite implementation