从实体框架MetaData获取数据库表名称 [英] Get Database Table Name from Entity Framework MetaData

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问题描述

我试图找出一种获取给定实体类型的底层SQL表名称的方法。我已经尝试了MetadataWorkspace查询,而我可以从对象或存储空间获取大量信息,我似乎无法弄清楚两者之间的映射方式。



所以说我有一个名为Lookup的对象模型中的类型 - 如何在数据库中找到tablename(wws_lookups)?



我可以查询所有用于CSpace和SSpace的EntityType对象,我可以看到这两个列表正确列出,但我无法弄清楚如何从CSpace获取SSpace。



有没有办法

解决方案

我使用Nigel的方法(从提取表名.ToTraceString()),但有一些修改,因为如果表不在默认SQL Server架构( dbo。{table-name} )中,他的代码将无法工作。 / p>

我已经为 DbContext ObjectContext 对象:

  public static class Conte xtExtensions 
{
public static string GetTableName&T;(此DbContext上下文)其中T:class
{
ObjectContext objectContext =((IObjectContextAdapter)context).ObjectContext;

return objectContext.GetTableName< T>();
}

public static string GetTableName< T>(此ObjectContext上下文)其中T:class
{
string sql = context.CreateObjectSet< T>()。 ToTraceString();
Regex regex = new Regex(@FROM\s +(?< table>。+)\s + AS);
匹配match = regex.Match(sql);

string table = match.Groups [table]。
返回表;
}
}

更多细节在这里:

实体框架:从实体获取映射表名称


I'm trying to figure out a way to get the underlying SQL table name for a given entity type. I've experimented around with the MetadataWorkspace queries and while I can get lots of information from the object or the storage space, I can't seem to figure out how to map between the two.

So say I have a type in the object model called Lookup - how do I find the tablename (wws_lookups) in the database?

I can query all the EntityType objects for CSpace and SSpace and I can see both listed correctly but I can't figure out how to get SSpace from CSpace.

Is there any way to do this?

解决方案

I use Nigel's approach (extracting table name from .ToTraceString()) but with some modifications, because his code won't work if the table is not in the default SQL Server schema (dbo.{table-name}).

I've created extension methods for DbContext and ObjectContext objects:

public static class ContextExtensions
{
    public static string GetTableName<T>(this DbContext context) where T : class
    {
        ObjectContext objectContext = ((IObjectContextAdapter) context).ObjectContext;

        return objectContext.GetTableName<T>();
    }

    public static string GetTableName<T>(this ObjectContext context) where T : class
    {
        string sql = context.CreateObjectSet<T>().ToTraceString();
        Regex regex = new Regex(@"FROM\s+(?<table>.+)\s+AS");
        Match match = regex.Match(sql);

        string table = match.Groups["table"].Value;
        return table;
    }
}

More details here:
Entity Framework: Get mapped table name from an entity

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