规范功能“EntityFunctions.TruncateTime”在MYSQL中不存在 [英] Canonical Function "EntityFunctions.TruncateTime" does not exist in MYSQL
问题描述
我正在尝试运行此查询：
I'm trying to run this query:
DateTime DDate=DateTime.Today; //Today's date without Time
var v= db.measurements.Where(m => EntityFunctions.TruncateTime(m.InDate) == DDate);
只返回这两个日期相等的对象，忽略时间部分。
It just returns objects where those two dates are equal, ignoring the time part.
但是我收到：
{FUNCTION [database] .TruncateTime不存在}
{"FUNCTION [database].TruncateTime does not exist"}
StackTrace：
StackTrace:
at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId)
at MySql.Data.MySqlClient.Driver.GetResult(Int32 statementId, Int32& affectedRows, Int64& insertedId)
at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
at MySql.Data.Entity.EFMySqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
我正在使用：
- C＃Visual Studio 2010
- EntityFramework 4数据库首先
- NetFramework 4
- MYSQL Server 5.6
- C# Visual Studio 2010
- EntityFramework 4 database first
- NetFramework 4
- MYSQL Server 5.6
MySQL.Data和MySQL.Data.Entity的版本为6.6.5.0
The version of MySQL.Data and MySQL.Data.Entity is 6.6.5.0
推荐答案
我无法解决它，所以我刚刚在数据库中创建了一个名为TruncateTime的函数。
I couldn't resolve it, so I just created a Function named "TruncateTime" in the database.
Create FUNCTION TruncateTime(dateValue DateTime) RETURNS date
return Date(dateValue);
它有效，但我不喜欢。
这些人做了类似的事情：
These people did similar things:
替代EntityFunctions.AddSeconds for MySQL
CurrentUtcDateTime不存在 - 实体框架和MySql
所以现在我认为这可能是不必要的，我可以直接从数据库中调用它，但仍然获取实体，如下所示：
So now I think that might be unnecessary and I can just call it directly from the database and still get entities, something like this:
var x = db.ExecuteStoreQuery<Measurement>(@"SELECT field1,field2
FROM Measurements
WHERE Date(InDate) = {0}", DDate);
这就是全部。
这篇关于规范功能“EntityFunctions.TruncateTime”在MYSQL中不存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
