Entity Framework学习中级篇5—使EF支持Oracle9i

Entity Framework学习中级篇5—使EF支持Oracle9i2010-02-05 博客园 ♂风车车.Net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

}

}

}