ADO.NET Entity Framework 学习中级篇5—使EF支持Oracle9i

从Code MSDN上下载下来的EFOracleProvider不支持Oracle9i.但是,目前我所使用的还是Oracle9i。为此,对EFOracleProvider修改了以下，以便使其支持Oracle9i.

下面说说具体修改地方.（红色部分为添加或修改的代码部分）

一，修改EFOracleProvider

1,修改EFOracleProviderManifest.cs类文件,

internal const string TokenOracle9i = "9i";//add by xray2005

internal const string TokenOracle10g = "10g";

internal const string TokenOracle11g = "11g";

以下两个地方,不修改也是可以的.但考虑目前我主要是使用9i,所以也就修改成9i了.

private EFOracleVersion _version = EFOracleVersion.Oracle9i; //EFOracleVersion.Oracle11g;

private string _token = TokenOracle9i; //TokenOracle10g;

2,修改EFOracleVersion.cs类文件，如下代码所示：

namespace EFOracleProvider

{

using System;

/// <summary>

/// This enum describes the current storage version

/// </summary>

internal enum EFOracleVersion

{

Oracle9i = 9, //add by xray2005

/// <summary>

/// Oracle10g

/// </summary>

Oracle10g = 10,

/// <summary>

/// Oracle 11g

/// </summary>

Oracle11g = 11,

// higher versions go here

}

/// <summary>

/// This class is a simple utility class that determines the version from the

/// connection

/// </summary>

internal static class EFOracleVersionUtils

{

/// <summary>

/// Get the version from the connection.

/// </summary>

/// <param name="connection">current connection</param>

/// <returns>version for the current connection</returns>

internal static EFOracleVersion GetStorageVersion(EFOracleConnection connection)

{

string serverVersion = connection.ServerVersion;

if (serverVersion.StartsWith("9."))

{

return EFOracleVersion.Oracle9i; //add by xray2005

}

else if (serverVersion.StartsWith("10."))

{

return EFOracleVersion.Oracle10g;

}

else if (serverVersion.StartsWith("11."))

{

return EFOracleVersion.Oracle11g;

}

throw new ArgumentException("Could not determine storage version; " +

"a valid storage connection or a version hint is required.");

}

internal static string GetVersionHint(EFOracleVersion version)

{

switch (version)

{

case EFOracleVersion.Oracle9i:

return EFOracleProviderManifest.TokenOracle9i; //add by xray2005

case EFOracleVersion.Oracle10g:

return EFOracleProviderManifest.TokenOracle10g;

case EFOracleVersion.Oracle11g:

return EFOracleProviderManifest.TokenOracle11g;

default:

throw new ArgumentException("Could not determine storage version; " +

"a valid storage connection or a version hint is required.");

}

}

internal static EFOracleVersion GetStorageVersion(string versionHint)

{

if (!string.IsNullOrEmpty(versionHint))

{

switch (versionHint)

{

case EFOracleProviderManifest.TokenOracle9i:

return EFOracleVersion.Oracle9i; //add by xray2005

case EFOracleProviderManifest.TokenOracle10g:

return EFOracleVersion.Oracle10g;

case EFOracleProviderManifest.TokenOracle11g:

return EFOracleVersion.Oracle11g;

}

}

throw new ArgumentException("Could not determine storage version; " +

"a valid storage connection or a version hint is required.");

}

internal static bool IsVersionX(EFOracleVersion storageVersion)

{

return storageVersion == EFOracleVersion.Oracle9i || storageVersion == EFOracleVersion.Oracle10g ||

storageVersion == EFOracleVersion.Oracle11g; //add by xray2005

}

}

}

二，使用EFOracleProvider

修改完毕后,编译一下.如果是自己下载的源代码编译的,那么编译后的EFOracleProvider自动已经在GAC注册了.如果是手动注册EFOracleProvider到GAC，那么命令如下：

gactuil –I “EFOracleProvider.dll”

其中gacutil.exe位于：系统盘符号:\Program Files\Microsoft SDKs\Windows v6.0\bin下面。

接下来，我们需要做的就是,把这个EFOracleProvider添加到Machine.config中.

第一步,找到Machine.config文件.该文件的位置在:

系统盘符号:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG下面.

第二步,用打开Machine.config文件,在DbProviderFactories配置节点,增加EFOracleProvider的配置,如下所示:

<DbProviderFactories>

<add name="Odbc Data Provider" invariant="System.Data.Odbc" description=".Net Framework Data Provider for Odbc" type="System.Data.Odbc.OdbcFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

<add name="OleDb Data Provider" invariant="System.Data.OleDb" description=".Net Framework Data Provider for OleDb" type="System.Data.OleDb.OleDbFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

<add name="OracleClient Data Provider" invariant="System.Data.OracleClient" description=".Net Framework Data Provider for Oracle" type="System.Data.OracleClient.OracleClientFactory, System.Data.OracleClient, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

<add name="SqlClient Data Provider" invariant="System.Data.SqlClient" description=".Net Framework Data Provider for SqlServer" type="System.Data.SqlClient.SqlClientFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

<add name="Microsoft SQL Server Compact Data Provider" invariant="System.Data.SqlServerCe.3.5" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=3.5.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />

<add name="EF Oracle Data Provider" invariant="EFOracleProvider" description="EF Provider for Oracle" type="EFOracleProvider.EFOracleProviderFactory,EFOracleProvider, Version=1.0.0.0, Culture=neutral, PublicKeyToken=def642f226e0e59b" />

</DbProviderFactories>

第三步,保存即可.

接下来，简单的介绍一下,如何使用这个EFOralceProvider.

第1步:在命令行窗口,将目录定位到提示符, 系统盘符:\WINDOWS\Microsoft.NET\Framework\v3.5.如下所示(是我电脑上的目录):




ef604.gif(1.91 K)

6/6/2009 7:45:25 AM

第2步,输入相应的生成参数.如下图所示:




ef602.gif(2.71 K)

6/6/2009 7:45:25 AM

将“data source=test;user id=xray;password= 123”成你自己的对应的参数即可.

确定之后,就可以看到生成的结果了,同时会有写信息出来,如下示:




ef603.gif(14.55 K)

6/6/2009 7:45:25 AM

至此,EdmGen就为我们生成需要的文件.生成的文件如下所示:

l TestEFModel.csdl

l TestEFModel.msl

l TestEFModel.ssdl

l TestEFModel.ObjectLayer.cs

l TestEFModel.Views.cs

然后,通过EdmGen2工具, 使用刚刚生成的TestEFModel .csdl, TestEFModel .msl, TestEFModel .ssdl三个文件来生成一个模型.

命令如下:

Edmgen2.exe /toedmx TestEFModel.csdl TestEFModel.msl TestEFModel.ssdl

确定之后,该工具就会为我们生成一个TestEFModel.edmx文件了.

然后,把这个文件加入到我们的项目中,同时修改项目的App.Config文件连接字符串,如下所示:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="NorthwindEFModelContext"
connectionString="provider=EFOracleProvider;
metadata=res://*/TestEFModel.csdl|res://*/TestEFModel.ssdl|res://*/TestEFModel.msl;
Provider Connection String='data source=test;user id=xray;password=1111'"
providerName="System.Data.EntityClient" />
</connectionStrings>
</configuration>

最后保存.

至此，修改EFOracleProvider并使用，介绍完毕。