小编Ste*_*hev的帖子

如何在JSTL中执行此简单检查(不扩展任何java类和其他JSP函数).我需要这样:

<c:if test="${fn:isNumeric()}">
 ... do something ...
</c:if>

提前致谢.

是否有可能只用一个这样的SQL语句创建索引(没有外键而不是唯一)和表(不是表变量).

CREATE TABLE tabind
(
    id          int             identity(1,1) primary key   ,
    birthday    datetime        default getdate()           ,
    some_id     int             INDEX index_name, /*this line causes a sql server error*/
    name        nvarchar(100)
);

实际上相当于这句话:

CREATE TABLE tabind
(
    id          int             identity(1,1) primary key   ,
    birthday    datetime        default getdate()           ,
    some_id int             ,
    name        nvarchar(100)
);

create index idx_tabind on tabind(some_id);

我的SQL Server版本是2012.

谢谢.

我有一个共享自定义"代码优先"DbContext对象的解决方案.

从今天开始尝试以这种方式访问​​实体之后的其中一个项目

 using(var cx = new MyContext())
 {
    var data = cx.Persons;
 }

我正在接受以下异常.

    {"Method not found: 'System.Data.Entity.Core.Metadata.Edm.EdmModel System.Data.Entity.Infrastructure.DbModel.get_StoreModel()'."}
        [System.MissingMethodException]: {"Method not found: 'System.Data.Entity.Core.Metadata.Edm.EdmModel System.Data.Entity.Infrastructure.DbModel.get_StoreModel()'."}
        Data: {System.Collections.ListDictionaryInternal}
        HelpLink: null
        HResult: -2146233069
        InnerException: null
        Message: "Method not found: 'System.Data.Entity.Core.Metadata.Edm.EdmModel System.Data.Entity.Infrastructure.DbModel.get_StoreModel()'."
        Source: "CodeFirstStoreFunctions"
        StackTrace: "   at CodeFirstStoreFunctions.FunctionsConvention.Apply(EntityContainer item, DbModel model)\r\n   
atSystem.Data.Entity.ModelConfiguration.Configuration.ConventionsConfiguration.ModelConventionDispatcher.Dispatch[T](T item)\r\n   
at System.Data.Entity.ModelConfiguration.Configuration.ConventionsConfiguration.ModelConventionDispatcher.VisitEdmEntityContainer(EntityContainer item)\r\n   
at System.Data.Entity.Edm.EdmModelVisitor.VisitCollection[T](IEnumerable`1 collection, Action`1 visitMethod)\r\n   at System.Data.Entity.Edm.EdmModelVisitor.VisitEntityContainers(IEnumerable`1 entityContainers)\r\n   at System.Data.Entity.Edm.EdmModelVisitor.VisitEdmModel(EdmModel item)\r\n   at System.Data.Entity.ModelConfiguration.Configuration.ConventionsConfiguration.ModelConventionDispatcher.VisitEdmModel(EdmModel item)\r\n   
at System.Data.Entity.ModelConfiguration.Configuration.ConventionsConfiguration.ModelConventionDispatcher.Dispatch()\r\n   at System.Data.Entity.ModelConfiguration.Configuration.Conven
    tionsConfiguration.ApplyStoreModel(DbModel model)\r\n   
at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)\r\n   at System.Data.Entity.DbModelBuilder.Build(DbConnection …