Question

我已经创建了一个存储库类，并具有以下代码：

public class InventoryDA : Accident_Reporting_Entities
{

}

Web.config：

<add name="Accident_Reporting_Entities" connectionString="metadata=res://*/Models.IncidentModel.csdl|res://*/Models.IncidentModel.ssdl|res://*/Models.IncidentModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=server;initial catalog=Accident_Reporting;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />

<add name="Accident_Reporting_Entities2" connectionString="metadata=res://*/Models.IncidentModel.csdl|res://*/Models.IncidentModel.ssdl|res://*/Models.IncidentModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=server;initial catalog=Accident_Reporting2;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />

我想知道如何拥有多个连接并将Accident_Reporting__Entities替换为另一个连接字符串。连接属于具有相同设计的不同数据库。是否可以检查会话变量并根据变量更改此连接，这是最好的方法吗？

Answer 1

您可以将同一个DbContext与多个连接字符串一起使用：

public partial class SchoolDBEntities : DbContext
{
    public SchoolDBEntities(string connectionString) : base(connectionString)
    {

    }
}

var db1 = new SchoolDBEntities("Server=myServerAddress;Database=myDataBase1;User Id=myUsername;Password=myPassword;");
var db2 = new SchoolDBEntities("Server=myServerAddress;Database=myDataBase2;User Id=myUsername;Password=myPassword;");

或者您可以将Web.config文件中密钥的名称传递给构造函数：

<configuration>
    <connectionStrings>
        <add name="myDataBase1" connectionString="Server=myServerAddress;Database=myDataBase1;User Id=myUsername;Password=myPassword;" />
        <add name="myDataBase2" connectionString="Server=myServerAddress;Database=myDataBase2;User Id=myUsername;Password=myPassword;" />
    </connectionStrings>
</configuration>

var db1 = new SchoolDBEntities("myDataBase1");
var db2 = new SchoolDBEntities("myDataBase2");

如何在项目中使用多个实体框架连接字符串？

1 个答案: