C#(99):使用托管程序连接Oracle数据库(Oracle.ManagedDataAccess.dll)
一、概述
Oracle Data Provider for .NET, Managed Driver:
Oracle官方的托管数据库访问组件,单DLL,Oracle.ManagedDataAccess.dll,不安装Oracle客户端,不区分32/64位, 直接引用即可。
与非托管程序为Oracle.DataAccess.dll相比,BulkCopy和CustomType之类的都是不支持的:
1、下载地址
官方下载地址:
http://www.oracle.com/technetwork/database/windows/downloads/index-090165.html (当前下版本为64-bit ODAC 12.2c Release 1 (12.2.0.1.0))
nuget:
https://www.nuget.org/packages/Oracle.ManagedDataAccess/ (当前下版本为19.7.0)
https://www.nuget.org/packages/Oracle.ManagedDataAccess.EntityFramework/ (当前下版本为19.7.0)
下载好后 从这个目录下 odp.net\managed\common拿出最关键的两个dll
Oracle.ManagedDataAccess.dll 和 Oracle.ManagedDataAccess.EntityFramework.dll 。
也可以在项目Nuget中直接安装这两个包。
注意:如果需要Entity Framework 设计时特性和其他如TableAdapter向导Visual Studio设计器,可以从https://otn.oracle.com/dotnet下载32位的“Oracle Developer Tools for Visual Studio” 。
此NuGet下载不支持设计时工具;它只提供运行时支持。这个版本的ODP.NET支持Oracle数据库版本11.2或更高版本。
二、配置文件定义数据源
1、无配置文件情况,直接连接DB
无SQL*Net配置文件tnsnames.ora,直接在C#程序中写连接字符串
string conString = "User Id=hr; password=hr;Data Source=localhost:1521/orcl; Pooling=false;";
2、使用配置文件方式:
1、使用 tnsnames.ora文件,此文件需放置在应用程序同目录:
tnsnames.ora内容:
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)
2、使用app.config或\web.config配置文件定义别名(无tnsnames.ora文件)
<oracle.manageddataaccess.client> <version number="*"> <dataSources> <dataSource alias="orcl" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME = orcl)))"/> </dataSources> </version> </oracle.manageddataaccess.client>
3、使用 TNS_ADMIN目录:
<oracle.manageddataaccess.client> <version number="*"> <settings> <setting name="TNS_ADMIN" value="C:\app\oracle\product\12.1.0\client_1\Network\Admin\"/> </settings> </version> </oracle.manageddataaccess.client>
3、完整的app/web.config 文件:
<configuration> <configSections> <section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.122.19.1, Culture=neutral, PublicKeyToken=89b483f429c47342"/> </configSections> <system.data> <DbProviderFactories> <remove invariant="Oracle.ManagedDataAccess.Client"/> <add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.122.19.1, Culture=neutral, PublicKeyToken=89b483f429c47342"/> </DbProviderFactories> </system.data> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <publisherPolicy apply="no"/> <assemblyIdentity name="Oracle.ManagedDataAccess" publicKeyToken="89b483f429c47342" culture="neutral"/> <bindingRedirect oldVersion="4.121.0.0 - 4.65535.65535.65535" newVersion="4.122.19.1"/> </dependentAssembly> </assemblyBinding> </runtime> <oracle.manageddataaccess.client> <version number="*"> <dataSources> <dataSource alias="SampleDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL))) "/> </dataSources> </version> </oracle.manageddataaccess.client> </configuration>
三、使用
string conString = "User Id=hr; password=hr; Data Source=orcl;Pooling=false; "; OracleConnection con = new OracleConnection(); con.ConnectionString = conString; con.Open(); OracleCommand cmd = con.CreateCommand(); cmd.CommandText = "select first_name from employees where department_id = 60"; OracleDataReader reader = cmd.ExecuteReader(); while (reader.Read()) { string conString = "User Id=hr; password=hr; Data Source=orcl;Pooling=false; "; OracleConnection con = new OracleConnection(); con.ConnectionString = conString; con.Open(); OracleCommand cmd = con.CreateCommand(); cmd.CommandText = "select first_name from employees where department_id = 60"; OracleDataReader reader = cmd.ExecuteReader(); while (reader.Read()) { Console.WriteLine("Employee Name: " + reader.GetString(0)); } Console.WriteLine("Employee Name: " + reader.GetString(0)); }
posted on 2019-08-22 12:32 springsnow 阅读(4749) 评论(0) 编辑 收藏 举报