Entity Framework 6 Code First +MVC5+MySql/Oracle使用过程中的几个问题

1、

namespace Snapsia.Web.Models
{
using System;
using System.Data.Entity;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;

[DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
public partial class SnapsiaContext : DbContext
{
public SnapsiaContext()
: base("name=SnapsiaContext")
{
}

public virtual DbSet<InfluencersUser> InfluencersUser { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
}
}
}

2、表“TableDetails”中列“IsPrimaryKey”的值为 DBNull

解决办法：

set global optimizer_switch='derived_merge=OFF';

http://stackoverflow.com/questions/33575109/mysql-entity-the-value-for-column-isprimarykey-in-table-tabledetails-is
http://bugs.mysql.com/bug.php?id=79163

https://dev.mysql.com/doc/refman/5.7/en/switchable-optimizations.html

3、

[Table("TB_USER", Schema = "USER_SNAPSIA")]//dbo架构在oracle数据库为用户名
public partial class TB_USER
{
[Key]
[StringLength(50)]
public string ID { get; set; }

[StringLength(50)]
public string USERNAME { get; set; }

[StringLength(50)]
public string PWD { get; set; }
}

public partial class OrclContext : DbContext
{
public OrclContext()
: base("name=OrclContext")
{
}
public virtual DbSet<TB_USER> TB_USER { get; set; }
public virtual DbSet<TB_SYYS> TB_SYYS { get; set; }
public virtual DbSet<TB_CCT> TB_CCT { get; set; }

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.HasDefaultSchema("USER_SNAPSIA"); //dbo架构在oracle数据库为用户名

modelBuilder.Entity<TB_USER>()
.Property(e => e.ID)
.IsUnicode(false);
}
}

4、VS2015 update3 +MySQL5.7+EntityFramework Code First

从数据库生成Code First 代码，选择连接后点击下一步，界面闪退，无法生成的解决办法。

需要安装最新版的两个组件：

mysql-connector-net-6.9.9

mysql-for-visualstudio-1.2.6

5、使用同一个上下文对象：

public static SnapsiaContext GetCurrentDbSession()
{
SnaContext context = CallContext.GetData(typeof(DbSessionContextFactory).FullName) as SnaContext;
if (context == null)
{
context = new SnaContext();
CallContext.SetData(typeof(DbSessionContextFactory).FullName, context);
}
return context;
}

6、EntityFramework Code First 优化

6.1、推荐使用IIS8.

6.2、参考文章：亲授MVC5中EF6 Code First启动慢及间隙变慢优化的实践经验
https://weblog.west-wind.com/posts/2013/Oct/02/Use-IIS-Application-Initialization-for-keeping-ASPNET-Apps-alive?utm_source=tuicool#GettingstartedwithApplicationInitialization http://www.cnblogs.com/hantianwei/archive/2013/04/26/3044157.html