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：
gacutil –I “EFOracleProvider.dll”
其中gacutil.exe位于：系统盘符号:\Program Files\Microsoft SDKs\Windows\v6.0A\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):
第2步,输入相应的生成参数.如下图所示:
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:
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。
最后提供几个连接，以方便大家学习研究：
l Code.MSDN上的EFOracleProvider；
l 经过我修改后，支持Oracle9i的EFOracleProvider.dll
