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C# 使用OCCI 连接Oracle 数据库

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Jun 07, 2016 pm 05:14 PM

oracle database

最近因需要研究了一下C#向Oracle数据库中插入数据的问题，通常情况下使用微软自带的组件ADO.NET来连接并操作数据库，这也是最简便

最近因需要研究了一下C#向Oracle数据库中插入数据的问题，通常情况下使用微软自带的组件ADO.NET来连接并操作数据库，这也是最简便的方式，用法也比较简单，即在程序开头加上using System.Data.OracleClient。另外就是使用Oracle提供的ODP.net,这需要下载ODAC,并在程序中引用Oracle.DataAccess.dll。

接下来写程序测试向数据库中插入记录的速度了，首先尝试使用ADO.net。

部分代码如下：

C#程序运行在Windows Server 2008 32位上，机器为Xeon E552O * 2,2.27Ghz,共16核内存12GB。Oracle 安装在RedHat AS4U4,cpu为AMD Opterron 275 * 2 ,2.2GHz,共4核心，，内存16GB,oracle 10g。
测试结果为33秒左右，每秒插入不到700条，之后也采用了绑定变量及调用存储过程等方法，插入速度也没有多大提高。

于是想到了用ODP.net,在网上查到说ODAC的版本必须与安装的oracle对应，虽然这个要求感觉不太灵活，因为实际的使用环境可能与开发环境不一致，到时还要更换ODAC的版本，且ODAC在官网上并不是能对应上所有的Oracle版本。在网上看到使用ODP.net插入速度可以达到数万条每秒，但我多次尝试时，都在运行时出现问题，根本无法运行成功。于是便放弃了。Oracle与MS的东西兼容性不强，或者说是Oracle本身向下兼容的能力弱，真是令人抓狂。

多方查找后发现了OCI这个东西，于是想到了使用封装了OCI的OCCI,这样眼前突然一亮。之后的思路就很清淅了，先用c++做一个dll,里面的函数是对OCCI的进行一步封装，再用c#调用这个dll就可以了。下面就是实现的具体过程了。

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