在.Net1.1中无论是对于批量插入整个DataTable中的所有数据到数据库中,还是进行不同数据源之间的迁移,都不是很方便。而 在.Net2.0中,SQLClient命名空间下增加了几个新类帮助我们通过DataTable或DataReader批量迁移数据。数据源可以来自关 系数据库或者XML文件,甚至WebService返回结果。其中最重要的一个类就是SqlBulkCopy类,使用它可以很方便的帮助我们把数据源的数 据迁移到目标数据库中。
下面我们先通过一个简单的例子说明这个类的使用:
首先:web.config
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C#文件: 前台不Copy了,就一个按钮,一个Label
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代码分析:
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sbc.BulkCopyTimeout = 5000000; //指定操作完成的Timeout时间
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性能方面:我在Sql中用proc插入68万条数据花了近8分钟,用SqlBulkCopy花了53.234秒~,效率高了7倍耶!不过现在也不做这方面的底层了,呵呵,把自己写的一个测试存储过程也贴上吧,方便自己学习
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转自http://blog.csdn.net/huaer1011/archive/2008/04/21/2312361.aspx
oracle 中也有对应的sqlbulkcopy方法不过不是在.net 自带的System.Data.SqlClient.dll中,而是需要安装oracle11g中的Oracle.DataAccess.dll中才有OracleBulkCopy方法,需要的时候可以尝试下。
安装了Oracle之后,都会安装上它提供的.net Provider .主要是在Oracle.DataAccess.dll这个动态库中。虽然说微软在.net框架中自带了一个System.Data.OracleClient.dll,不过我觉得功能上面远没有oracle自己提供的功能多。就拿我最近的一个需求来说的话,大量数据往Oracle中写入,还可能涉及到插入或者更新的问题。之前微软在System.Data.SqlClient.dll中为写Sql server提供了一个很方便的方法—SqlBulkCopy.之前还郁闷为什么没有写oracle的SqlBulkCopy,现在终于让我在Oracle.DataAccess.dll这里找到这个方法了--OracleBulkCopy。哈哈,有了这2个方法,以后在数据交换方面应该是很方便的了。至少在写SQL Server和Oracle中是有了比较高效率的方法了。待会来做个实验试一下。
PS:发现是oracle11g中的Oracle.DataAccess.dll中才有OracleBulkCopy。好像10g中的都没有。不知道是不是只能在装了11g的Oracle中用。待会看看测试情况就知道了。
经过测试,确实是只能在安装了11g的机子上面使用。我安装的是10G的,结果运行的时候就报出一个The provider is not compatible with the version of Oracle client. 明显就是版本不匹配,不知道有没有什么办法解决,正在寻找中。
现在在win7下面用兼容模式装上了oracle10g,没办法测试这个了,等下次安装个11G了再来测试一下这个的性能。