實體框架有時不返回結果到列表

Question

我有EF的問題。所以，我在我的mysql表中有1000000條記錄。我需要限制查詢。例如，我做跳過查詢50000

var listRoutes = (from c in context.Routes 
          where c.Alias != "" 
          orderby c.Alias ascending 
          select c).Skip(50000).Take(500).ToList(); 

和listRoutes有500條記錄。如果我做查詢與跳過100000

var listRoutes = (from c in context.Routes 
           where c.Alias != "" 
           orderby c.Alias ascending 
           select c).Skip(100000).Take(500).ToList(); 

或

List<Route> listRoutes = context.Routes.Where(x => x.Alias != "").OrderBy(a => a.Alias).Skip(100000).Take(500).ToList(); 

listRoutes有0的記錄。但是，如果我做查詢跳過100000或更多

List<Route> listRoutes = context.Database.SqlQuery<Route>("SELECT * FROM testcmsdatamap.routes WHERE alias != '' order by alias asc limit 500000, 500").ToList(); 

listRoutes也有500 ...什麼問題？

Answer 1

問題已解決。大數據出現問題。 EF構建錯誤的SQL。爲INDEX構建簡單的SQL查詢。所以，我有其他問題Entity Framework with Mysql Index