protected override Expression VisitUpdate(UpdateCommandExpression update)
{
if (update.Assignments.Count == 0)
{
return(Expression.Constant(-1));
}
return(BuildExecuteNoQueryCommand(update));
}
/// <summary>
/// 访问 <see cref="UpdateCommandExpression"/> 表达式。
/// </summary>
/// <param name="update"></param>
/// <returns></returns>
protected override Expression VisitUpdate(UpdateCommandExpression update)
{
_isAsync = _isAsync || update.IsAsync;
//如果没有更新参数，则返回-1
if (update.Assignments.Count == 0)
{
return(_isAsync ? Expression.Constant(Task.FromResult(-1)) : Expression.Constant(-1));
}
return(BuildExecuteNoQueryCommand(update));
}
