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SQLitePlus COM DLL

 

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SQLite database engine COM DLL wrapper

SQLitePlus Overview
SQLitePlus Database Explorer

The SQLitePlus COM DLL is a "wrapper" around the SQLite C library.  You use this DLL to access SQLite databases from your Windows programs.  Since it is a COM DLL, it is usable by most common Windows programming languages (eg. VB, C++, Delphi, .NET, etc.).  SQLitePlus Explorer uses this COM DLL for all of its database access, so you can see just how powerful it is.  It supports all of the features of SQLite, such as Full Text Search.

Improved Stored Script facility.  Now features "inline text" output similar to ASP/PHP.  Its a really ideal XML/HTML generator.
  Includes built-in import and export functions.  Now you can import CSV/TAB files in a variety of formats - UTF-8, UTF-16 or any Code Page.  This features makes it super-easy to import just about any CSV file and immediately begin manipulating it with SQL.

The SQLitePlus COM DLL is not a stand-alone DLL - it also uses a SQLitePlus version DLL, as explained here.  The COM DLL is separated from the actual SQLite engine DLL for two very important reasons:

  1. Splitting them into 2 DLLs eliminates the "DLL Hell" issue and protects your product installation.  If it were all in one DLL, another company's product may use a different SQLitePlus COM DLL version than yours.  This is a huge potential problem, since the COM DLL is compiled with a specific version of the SQLite engine.  If another program installs a different version of the COM DLL, it could break your program, or it may be a SQLite version with a bug that affects your product in an adverse way.
     
  2. Also so that its possible to compile a customized SQLite DLL* with no changes to the SQLitePlus COM DLL.  The SQLite C library is extensible via two mechanisms:  User-defined Functions and User-defined Aggregates (this is how we added the ENCRYPT, COMPRESS, etc. functions).  These must be written in C and compiled into the DLL.  Having it as a separate DLL makes it possible for us to create customized versions for you, with your own DLL name so that there is no chance of version issues.  This is a service we offer to customers who need custom functions added (at a cost).

Some other products boast that their COM DLL is all in a single DLL, as if it were a good thing - not split in 2 like ours.  Don't be fooled by this marketing hype.  Its certain to cause you major headaches if another product that uses that DLL is ever installed on the same PC.  Our system allows you to install the version DLL to your own application folder (regardless of where the COM DLL is installed - which should be the "program files/common files/eztools" folder by the way).  Only in this way can you be guaranteed that your application will always work no matter what other applications do.

The SQLitePlus version DLL is named in this pattern:

sqltvXXXX.dll

where X is the SQLite version.  For example 3.3.17 would be sqlt3317.dll.  You specify the DLL name to use via the SqliteDb.Init method (see example below).  The diagram below depicts the application, SQLitePlus DLLs and the database.

The SQLitePlus object model is very similar to ADO (Microsoft ActiveX Data Objects).  The main SQLitePlus COM object is SqliteDb. With this object, you issue SQL commands.  If the command is a row-returning query, the results are returned in a Dataset object, which is made up of rows and columns.  This object is very similar to the ADO Recordset object.  You access the Dataset Column objects via the Dataset Columns collection (like ADO Field and Fields).  You use methods on the Dataset to move through the dataset, such as MoveFirst and MoveNext. Like ADO, using SQLitePlus is very easy.

Here is a Visual Basic sample that demonstrates opening the sample Northwind database (provided in the setup), issuing a row-returning SQL query and displaying the results.


Dim db As New SqliteDb
Dim ds As Dataset
Dim col As Column

'specify the SQLite DLL version to use
db.Init "sqlt3317.dll"

db.Open App.Path & "\northwind.db", eReadWrite

Set ds = db.Exec("select * from suppliers")

If Not ds.EOD Then
    For Each col In ds.Columns
        Debug.Print "Column Name: " & col.Name & " Type: " & col.TypeName
    Next
    While Not ds.EOD
        For Each col In ds.Columns
            Debug.Print col
        Next
        Debug.Print vbCrLf
        ds.MoveNext
    Wend
End If

db.Close

As you can see, using SQLitePlus in your programs is very easy.  To give you ideas of how you can use and to get you started with SQLitePlus, please check out these articles on the WinDevTools.com website:




 

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