public override void SetParametersOnCommand(IDbCommand cmd, IEnumerable parameters)
{
IEnumerator enumer = parameters.GetEnumerator();
if (enumer.MoveNext())
{
// There's at least one, so split apart the sql.
string[] sqlPieces = cmd.CommandText.Split('?');
StringBuilder sb = DbCaches.StringBuilders.Get();
for (int x = 0; x < (sqlPieces.Length - 1); x++)
{
// First append the sql fragment.
sb.Append(sqlPieces[x]);
// The name of the param has to be prepended with a @ in the sql, but not
// on the parameter object.
sb.Append("@");
string paramName = DbCaches.ParamNames.Get(x);
sb.Append(paramName);
// Get the value to insert.
object param = enumer.Current ?? DBNull.Value;
// Construct and add the parameter object.
cmd.Parameters.Add(new FbParameter(paramName, param));
// Move the enumerator to the next item, if there should be another one.
if ((x + 1) < (sqlPieces.Length - 1))
{
if (!enumer.MoveNext())
{
throw new ArgumentException("Command sql has " +
(sqlPieces.Length - 1) + " params, but you only passed " +
(x + 1) +
" parameters: " +
SqlUtilities.SqlParamsToString(cmd.CommandText, parameters) +
" You may get this if your sql string has a ? in it. In that case you" +
" can try parameterizing whatever string constant has the ? and passing" +
" the constant from your code. Not super elegant, but a whole lot easier than" +
" making this code understand quoted or escaped characters in the sql string.");
}
}
}
// Check that we don't have leftover parameters.
if (enumer.MoveNext())
{
throw new ArgumentException("Command sql has " +
(sqlPieces.Length - 1) + " params, but you passed more than that: " +
SqlUtilities.SqlParamsToString(cmd.CommandText, parameters));
}
// Append the last sql fragment.
sb.Append(sqlPieces[sqlPieces.Length - 1]);
cmd.CommandText = sb.ToString();
DbCaches.StringBuilders.Return(sb);
}
}
