Home Database Mysql Tutorial Oracle 4个大对象(lobs)数据类型介绍

Oracle 4个大对象(lobs)数据类型介绍

Jun 07, 2016 pm 05:26 PM

在oracle中,有4个大对象(lobs)类型可用,分别是blob,clob,bfile,nclob。

在Oracle中,有4个大对象(lobs)类型可用,分别是blob,clob,bfile,nclob。

下面是对lob数据类型的简单介绍。

blob:二进制lob,为二进制数据,最长可达4GB,存贮在数据库中。

clob:字符lob,字符数据,最长可以达到4GB,存贮在数据库中。

bfile:二进制文件;存贮在数据库之外的只读型二进制数据,,最大长度由操作系统限制。

nclob:支持对字节字符集合(nultibyte characterset)的一个clob列。

对于如何检索和操作这些lob数据一直是oracle数据库开发者经常碰到的问题。下面我将在oracle对lob数据处理的一些方法和技巧,介绍给读者,希望能够对读者以后的开发有所帮助。

oracle中可以用多种方法来检索或操作lob数据。通常的处理方法是通过dbms_lob包。

其他的方法包括使用api(application programminginterfaces)应用程序接口和oci(oracle call interface)oracle调用接口程序。

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