///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// If the underlying database connection is open, fetches the number of changed rows
/// resulting from the most recent query; otherwise, does nothing.
/// </summary>
/// <param name="changes">
/// The number of changes when true is returned.
/// Undefined if false is returned.
/// </param>
/// <returns>Non-zero if the number of changed rows was fetched.</returns>
internal bool TryGetChanges(ref int changes)
{
if ((_sql != null) && _sql.IsOpen())
{
changes = _sql.Changes;
return(true);
}
return(false);
}
/// <summary>
/// Internal collation sequence function, which wraps up the raw string pointers and executes the Compare() virtual function.
/// WARNING: Must not throw exceptions.
/// </summary>
/// <param name="ptr">Not used</param>
/// <param name="len1">Length of the string pv1</param>
/// <param name="ptr1">Pointer to the first string to compare</param>
/// <param name="len2">Length of the string pv2</param>
/// <param name="ptr2">Pointer to the second string to compare</param>
/// <returns>Returns -1 if the first string is less than the second. 0 if they are equal, or 1 if the first string is greater
/// than the second. Returns 0 if an exception is caught.</returns>
internal int CompareCallback(IntPtr ptr, int len1, IntPtr ptr1, int len2, IntPtr ptr2)
{
try
{
return(Compare(SQLiteConvert.UTF8ToString(ptr1, len1),
SQLiteConvert.UTF8ToString(ptr2, len2))); /* throw */
}
catch (Exception e) /* NOTE: Must catch ALL. */
{
try
{
if ((_flags & SQLiteConnectionFlags.LogCallbackException) ==
SQLiteConnectionFlags.LogCallbackException)
{
SQLiteLog.LogMessage(SQLiteBase.COR_E_EXCEPTION,
String.Format(CultureInfo.CurrentCulture,
"Caught exception in \"Compare\" (UTF8) method: {0}",
e)); /* throw */
}
}
catch
{
// do nothing.
}
}
//
// NOTE: This must be done to prevent the core SQLite library from
// using our (invalid) result.
//
if ((_base != null) && _base.IsOpen())
{
_base.Cancel();
}
return(0);
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// If the underlying database connection is open, fetches the number of changed rows
/// resulting from the most recent query; otherwise, does nothing.
/// </summary>
/// <param name="changes">
/// The number of changes when true is returned.
/// Undefined if false is returned.
/// </param>
/// <param name="readOnly">
/// The read-only flag when true is returned.
/// Undefined if false is returned.
/// </param>
/// <returns>Non-zero if the number of changed rows was fetched.</returns>
internal bool TryGetChanges(
ref int changes,
ref bool readOnly
)
{
if ((_sql != null) && _sql.IsOpen())
{
changes = _sql.Changes;
readOnly = _sql.IsReadOnly(this);
return(true);
}
return(false);
}
