/// <summary>
/// Executes an SQL statement and return the results.
/// </summary>
/// <param name="statement">The SQL statement to execute.</param>
/// <param name="channel">The channel to use.</param>
/// <returns>The Result object.</returns>
public Result Execute(string statement, Channel channel)
{
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write(statement);
}
Tokenizer c = new Tokenizer(statement);
Parser p = new Parser(this, c, channel);
Result rResult = new Result();
string newStatement = string.Empty;
int updateCount = 0;
try
{
if (_log != null && _log.cCache != null)
{
_log.cCache.CleanUp();
}
if (TracingHelper.AssertEnabled)
{
TracingHelper.Assert(!channel.IsNestedTransaction);
}
TracingHelper.Check(channel != null, TracingHelper.ACCESS_IS_DENIED);
TracingHelper.Check(!_shutDown, TracingHelper.DATABASE_IS_SHUTDOWN);
while (true)
{
int begin = c.Position;
bool script = false;
string sToken = c.GetString();
if (sToken.Equals(""))
{
break;
}
switch (sToken)
{
case "SELECT":
rResult = p.ProcessSelect();
break;
case "INSERT":
rResult = p.ProcessInsert();
break;
case "UPDATE":
rResult = p.ProcessUpdate();
break;
case "DELETE":
rResult = p.ProcessDelete();
break;
case "ALTER":
rResult = p.ProcessAlter();
break;
case "CREATE":
rResult = ProcessCreate(c, channel);
script = true;
break;
case "DROP":
rResult = ProcessDrop(c, channel);
script = true;
break;
case "GRANT":
rResult = ProcessGrantOrRevoke(c, channel, true);
script = true;
break;
case "REVOKE":
rResult = ProcessGrantOrRevoke(c, channel, false);
script = true;
break;
case "CONNECT":
rResult = ProcessConnect(c, channel);
break;
case "DISCONNECT":
rResult = ProcessDisconnect(c, channel);
break;
case "SET":
rResult = ProcessSet(c, channel);
script = true;
break;
case "SCRIPT":
rResult = ProcessScript(c, channel);
break;
case "COMMIT":
rResult = ProcessCommit(c, channel);
script = true;
break;
case "ROLLBACK":
rResult = ProcessRollback(c, channel);
script = true;
break;
case "SHUTDOWN":
rResult = ProcessShutdown(c, channel);
break;
case "CHECKPOINT":
rResult = ProcessCheckpoint(channel);
break;
case "CALL":
rResult = p.ProcessCall();
break;
case "SHOW":
rResult = ProcessShow(c, channel);
break;
case "DECLARE":
rResult = p.ProcessDeclare();
script = true;
break;
case ";":
continue;
default:
throw TracingHelper.Error(TracingHelper.UnexpectedToken, sToken);
}
if (rResult != null && rResult.UpdateCount > updateCount)
{
updateCount = rResult.UpdateCount;
}
if (script && _log != null)
{
int end = c.Position;
_log.Write(channel, c.GetPart(begin, end));
}
}
}
catch (Exception e)
{
rResult = new Result(TracingHelper.GetMessage(e) + " in statement [" + statement + "]");
}
if (rResult != null && rResult.UpdateCount < updateCount)
{
rResult.SetUpdateCount(updateCount);
}
return(rResult);
}
