private string GetSqlMode()
{
MySqlCommand cmd = new MySqlCommand("SELECT @@SQL_MODE", connection);
return cmd.ExecuteScalar().ToString();
}
/// <summary>
/// Execute a single command against a MySQL database.
/// </summary>
/// <param name="connection"><see cref="MySqlConnection"/> object to use</param>
/// <param name="commandText">Command text to use for the command</param>
/// <param name="commandParameters">Parameters to use for the command</param>
/// <returns>The first column of the first row in the result set, or a null reference if the result set is empty.</returns>
public static object ExecuteScalar(MySqlConnection connection, string commandText, params MySqlParameter[] commandParameters)
{
//create a command and prepare it for execution
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = connection;
cmd.CommandText = commandText;
cmd.CommandType = CommandType.Text;
if (commandParameters != null)
foreach (MySqlParameter p in commandParameters)
cmd.Parameters.Add(p);
//execute the command & return the results
object retval = cmd.ExecuteScalar();
// detach the SqlParameters from the command object, so they can be used again.
cmd.Parameters.Clear();
return retval;
}
internal string CurrentDatabase()
{
if (Database != null && Database.Length > 0)
return Database;
MySqlCommand cmd = new MySqlCommand("SELECT database()", this);
return cmd.ExecuteScalar().ToString();
}
internal string GetCommandTextForBatching()
{
if (batchableCommandText == null)
{
// if the command starts with insert and is "simple" enough, then
// we can use the multi-value form of insert
if (String.Compare(CommandText.Substring(0, 6), "INSERT", true) == 0)
{
MySqlCommand cmd = new MySqlCommand("SELECT @@sql_mode", Connection);
string sql_mode = cmd.ExecuteScalar().ToString().ToUpper(CultureInfo.InvariantCulture);
MySqlTokenizer tokenizer = new MySqlTokenizer(CommandText);
tokenizer.AnsiQuotes = sql_mode.IndexOf("ANSI_QUOTES") != -1;
tokenizer.BackslashEscapes = sql_mode.IndexOf("NO_BACKSLASH_ESCAPES") == -1;
string token = tokenizer.NextToken().ToLower(CultureInfo.InvariantCulture);
while (token != null)
{
if (token.ToUpper(CultureInfo.InvariantCulture) == "VALUES" &&
!tokenizer.Quoted)
{
token = tokenizer.NextToken();
Debug.Assert(token == "(");
// find matching right paren, and ensure that parens
// are balanced.
int openParenCount = 1;
while (token != null)
{
batchableCommandText += token;
token = tokenizer.NextToken();
if (token == "(")
openParenCount++;
else if (token == ")")
openParenCount--;
if (openParenCount == 0)
break;
}
if (token != null)
batchableCommandText += token;
token = tokenizer.NextToken();
if (token != null && (token == "," ||
token.ToUpper(CultureInfo.InvariantCulture) == "ON"))
{
batchableCommandText = null;
break;
}
}
token = tokenizer.NextToken();
}
}
// Otherwise use the command verbatim
else batchableCommandText = CommandText;
}
return batchableCommandText;
}
private int GetTimeZoneOffset( MySqlConnection con )
{
MySqlCommand cmd = new MySqlCommand("select timediff( curtime(), utc_time() )", con);
string s = cmd.ExecuteScalar().ToString();
return int.Parse(s.Substring(0, s.IndexOf(':') ));
}