System.Data.SQLite
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    ADO.NET 2.0 SQLite Data Provider<br>
    Version 1.0.9 -&nbsp;May 24, 2005<br>
    Interop using SQLite 3.21<br>
    Written by Robert Simpson (<a href="mailto:robert@blackcastlesoft.com">robert@blackcastlesoft.com</a>)<br>
    Released to the public domain, use at your own risk!<br>
    <br>
    This provider was written and verified using the Visual Studio 2005 Beta 2 
    release.<br>
    <br>
    The latest version can be downloaded <a href="http://sourceforge.net/projects/sqlite-dotnet2">
      here</a>
    <br>
    <br>
    <b></b>
    <h2>
      <b>Features:</b><br>
    </h2>
    <ul>
      <li>
      DbProviderFactory support, just add the XML below at the machine.config and/or 
      app.config level.
      <li>
        Full support for ATTACH'ed databases.&nbsp; Exposed as <i>Catalogs</i>
      in the schema.&nbsp; When cloning a connection, all attached databases are 
      automatically re-attached to the new connection.
      <li>
        DbConnection.GetSchema(...) support includes the <i>MetaDataCollections</i>, <i>DataSourceInformation</i>,
        <i>Columns</i>, <i>Tables</i>, <i>Views</i>, <i>Catalogs</i> and <i>Indexes</i>
      keywords.
      <li>
      Enhanced DbDataReader.GetSchemaTable() functionality returns catalog, namespace 
      and detailed schema information even for complex queries.
      <li>
      Named and unnamed parameters.
      <li>
      Full UTF-8 and UTF-16 support.
      <li>
      Multiple simultaneous DataReaders (one DataReader per Command however).
      <li>
      Full support for user-defined scalar and aggregate functions, encapsulated into 
      an easy-to-use base class in which only a couple of overrides are necessary to 
      implement new SQL functions.
      <li>
        Full support for user-defined collating sequences, every bit as simple to 
        implement as user-defined functions and uses the same base class.</li></ul>
    <strong></strong>
    <h2>
      <strong>Compiling:</strong></h2>
    In order to use the SQLiteFactory and have the SQLite data provider enumerated 
    in the DbProviderFactories methods, you must add the following segment into 
    either your application's app.config or the system's machine.config located in 
    the %SystemRoot%\Microsoft.Net\Framework\v2.xxxx\Config folder:<br>
    <br>
    <pre>
&lt;configuration&gt;
  &lt;system.data&gt;
    &lt;DbProviderFactories&gt;
      &lt;add name="SQLite Data Provider" invariant="System.Data.SQLite" support="3F" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" /&gt;
    &lt;/DbProviderFactories&gt;
  &lt;/system.data&gt;
&lt;/configuration&gt;
</pre>
    <br>
    <h3>
      Compiling for the Compact Framework</h3>
    <p>
      The SQLite.Interop.DLL does not (yet) support a build that includes Windows CE 
      processor architectures.&nbsp; I am aware of the CE port of SQLite and will be 
      investigating their code to see how best to proceed in that regard.&nbsp; I am 
      also waiting for the newer version of SQLite to become available which will 
      offer select metadata information and will cause a major redesign of this 
      library to support it.<br>
      <b></b>
    </p>
    <h2>
      <b>Development Notes Regarding the SQLite 3 Source Code</b></h2>
    <p></p>
    <p>
      Steps for merging the sqlite3 core codebase:</p>
    <ol>
      <li>
        Download the latest sqlite3 source from <a href="http://www.sqlite.org/download.html">
          http://www.sqlite.org/download.html</a>
      <li>
        Extract the source code to the <b>SQLite.Interop\src</b>
      directory of this project
      <li>
        Open the <b>src\select.c</b>
      file.
      <li>
        Add <b>#include "../interop.h" </b>
      to the top of the file where the other include's are.
      <li>
        Scroll down the <b>select.c</b> file to around line <b>748</b>.&nbsp; Change 
        the name of the function <b>static void generateColumnNames </b>to <b>static void 
          _generateColumnNames</b> (<i>note the underscore in front of the name</i>).
      <li>
        Compile it.</li>
    </ol>
    <b></b>
    <h2>
      <b>Version History</b></h2>
    <b>1.09 - May 24, 2005</b><br>
    <ul>
      <li>
      Code merge with the latest 3.21 version of SQLite.
      <li>
        Removed obsolete methods and properties for Whidbey Beta 2</li></ul>
    <b>1.08 Refresh - Mar 24, 2005<br>
    </b>
    <ul>
      <li>
      Code merge with the latest 3.20 version of SQLite.
      <li>
        Recompiled the help file to fix a build error in it.</li>
    </ul>
    <b>1.08 - Mar 11, 2005<br>
    </b>
    <ul>
      <li>
      Added additional #if statements to support the old beta 1 edition of VS2005.
      <li>
        Code merged the SQLite 3.14 source.</li>
    </ul>
    <b>1.07 - Mar 5, 2005</b><br>
    <ul>
      <li>
      Made more optimizations to frequently-called functions, resulting in 
      significant performance gains in all tests.
      <li>
        Recompiled the binaries using the latest VS2005 February CTP, resulting in yet 
        more significant speed gains.&nbsp; The 100k insert test used to take 3.5 
        seconds and the insertwithidentity took almost 8 seconds.&nbsp; With the above 
        two changes, those tests are now executing in 1.9 and 4.9 seconds respectively.</li></ul>
    <p>
      <b>1.06 - Mar 1, 2005<br>
      </b>
    </p>
    <ul>
      <li>
      Speed-ups to SQLiteDataReader.&nbsp; It was interop'ing unnecessarily every 
      time it tried to fetch a field due to a logic error.
      <li>
      Changed/Added some code to SQLiteConvert's internal DbType, Type and 
      TypeAffinity functions.
      <li>
      Fixed the SQLiteDataReader to obey the flags set in the optional 
      CommandBehavior flag from SQLiteCommand.ExecuteReader().
      <li>
      Changed the default page size to 1024 to reflect the defaults of SQLite.&nbsp; 
      Ignores the "Page Size" connection string option for memory databases, as tests 
      revealed that changing it resulted in memory corruption errors.
      <li>
        Performance enhancements to the SQLiteCommand and SQLiteStatement classes which 
        reduced the 100,000 row insert execution time as well as the various Function 
        execution times significantly.</li>
    </ul>
    <b>
      <br>
      1.05 - Feb 25, 2005</b>
    <ul>
      <li>
      Fixed the SQLite3 C# class step/reset functions to accomodate schema changes 
      that invalidate a prepared statement.&nbsp; Statements are recompiled 
      transparently.
      <li>
      Moved all native DLL declarations to an UnsafeNativeMethods class.
      <li>
      Split several classes into their own modules for readability.
      <li>
      Renamed many internal variables, reviewed access to variables marked as 
      internal and altered their protection levels accordingly.
      <li>
      Due to the presence of the altered sqlite3 codebase and so many added interop 
      functions, I decided to rename the sqlite3 C project and the DLL to 
      SQLite.Interop.DLL.&nbsp; This is the same core sqlite3 codebase but designed 
      specifically for this ADO.NET provider.&nbsp; This eliminates any possibility 
      of someone dropping another build of sqlite3.dll into the system and rendering 
      the provider inoperable.&nbsp; In the future if the folks at sqlite.org finally 
      introduce a method of retrieving column usage for an arbitrary prepared 
      statement, I'll retool this library to be a lightweight function call wrapper 
      around the core binary distribution.
      <li>
      Added [SuppressUnmanagedCodeSecurity] attribute to the UnsafeNativeMethods 
      class which brings VS2005 November CTP execution speeds inline with the 
      December CTP.
      <li>
        Added a <b>bin</b>
      directory to the project root where pre-compiled binaries can be found.
      <li>
        Added a <b>doc</b>
      directory where preliminary documentation on the class library can be found.
      <li>
        Documented a lot more of the classes internally.</li>
    </ul>
    <b>
      <br>
      1.04 - Feb 24, 2005</b>
    <ul>
      <li>
      Removed the SQLiteContext class and revamped the way UserFunctions work to 
      simplify the imlementation.
      <li>
      Fixed a counting bug in the TestCases class, specifically in the function tests 
      where I wasn't resetting the counter and it was consequently reporting 
      intrinsic and raw select calls as being much much faster than they actually 
      were.&nbsp; The numbers are now much closer to what I expected for performance, 
      with .NET user-functions still being the slowest, but only by a small margin.
      <li>
      Small performance tweaks to SQLiteDataReader.
      <li>
      Added PageSize to the SQLiteConnectionStringBuilder and subsequently to the 
      SQLiteConnection
      <li>
        Added a PRAGMA encoding=XXX execution statement to the SQLiteConnection after 
        opening a connection.</li>
    </ul>
    <b>1.03 - Feb 23, 2005</b>
    <ul>
      <li>
      Fixed up SQLiteCommandBuilder to correct implementation errors, which resulted 
      in an enormous performance boost in the InsertMany test.&nbsp;&nbsp; 10,000 row 
      insert that executed in 1500ms now executes in 500ms.
      <li>
      Fixed several errors in the SQLite3_UTF16 class.&nbsp; ToString() was working 
      incorrectly and the Open() method failed to register user defined functions and 
      collations.
      <li>
      Fixed a bug in SQLiteCommand.ClearCommands() whereby only the first statement 
      was being properly cleaned up.
      <li>
      Fixed a bug in SQLiteDataReader whereby calling NextResult() would not properly 
      reset the previously-executed command in the sequence.
      <li>
        Added an InsertManyWithIdentityFetch test, which appends a select clause to 
        populate the ID of the last inserted row into the InsertCommand, demonstrating 
        ADO.NET's ability to auto-fetch identity columns on insert.</li>
    </ul>
    <p>
      <b>1.02 - Feb 21, 2005</b></p>
    <ul>
      <li>
      Tweaks to the xxx_interop functions that return char *'s, so they also return 
      the length.&nbsp; Saves an interop call to get the UTF-8 string length during 
      conversion to a .NET string.
      <li>
      Reworked the whole interop.c thing into interop.h and reduced the code required 
      to merge the main sqlite3 codebase.
      <li>
        Added support for user-defined collations.</li>
    </ul>
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