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<HEAD><TITLE>FAQ汇萃 >> Oracle 专栏 >> 如何对CLOB行字段执行全文检索</title>
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>> 如何对CLOB行字段执行全文检索 [<a href=http://www.jsp001.com/forum/showthread.php?goto=newpost&threadid=252>查看别人的评论</a>]<br>
<hr><p>由 webmaster 发布于: 2001-02-05 11:32</p><p><img src="images/icons/icon9.gif" alt="Unhappy" border=0> </p><p><br><br>大家知道，超过4000字的文本一般存储在CLOB中（MSQL、Sysbase是存放在Text中），在目前的Oracle版本（Oracle8i)中，对大字段CLOB仍然不支持在where子句直接的like操作，如何实现对存储在CLOB字段中的内容进行like查找呢？下面的文章或则能给你帮助。虽然在SQL*PLUS中能实现用select直接看到CLOB的内容，但是如何通过DBMS_LOB包实现对中文环境下的CLOB内容的读取我一直没有找到好的方法（使用Documents中提到的Samples只适用英文字符集），这极大的限制了使用第3方软件开发工作的自由度。如果那位仁兄有高招希望Email给我。 <br><br>表结构：<br>create table products( <br>productid number(10) not null ,<br>name varchar2(255) ,<br>description CLOB) ;<br><br>方法：<br>SELECT productid, name FROM products <br>WHERE dbms_lob.instr(products.description,'some text',1,1) > 0; <br><br><br> <br><br>下面列出了DBMS_LOB包中的过程函数：<br><br>APPEND procedure Appends the contents of the source LOB to the destination LOB. <br><br>CLOSE procedure Closes a previously opened internal or external LOB. <br><br>COMPARE function Compares two entire LOBs or parts of two LOBs. <br><br>COPY procedure Copies all, or part, of the source LOB to the destination LOB. <br><br>CREATETEMPORARY procedure Creates a temporary BLOB or CLOB and its corresponding index in the user's default temporary tablespace. <br><br>ERASE procedure Erases all or part of a LOB. <br><br>FILECLOSE procedure Closes the file. <br><br>FILECLOSEALL procedure Closes all previously opened files. <br><br>FILEEXISTS function Checks if the file exists on the server. <br><br>FILEGETNAME procedure Gets the directory alias and file name. <br><br>FILEISOPEN function Checks if the file was opened using the input BFILE locators. <br><br>FILEOPEN procedure Opens a file. <br><br>FREETEMPORARY procedure Frees the temporary BLOB or CLOB in the user's default temporary tablespace. <br><br>GETCHUNKSIZE function Returns the amount of space used in the LOB chunk to store the LOB value.<br><br>GETLENGTH function Gets the length of the LOB value. <br><br>INSTR function Returns the matching position of the nth occurrence of the pattern in the LOB. <br><br>ISOPEN function Checks to see if the LOB was already opened using the input locator. <br><br>ISTEMPORARY function Checks if the locator is pointing to a temporary LOB. <br><br>LOADFROMFILE procedure Loads BFILE data into an internal LOB. <br><br>OPEN procedure Opens a LOB (internal, external, or temporary) in the indicated mode. <br><br>READ procedure Reads data from the LOB starting at the specified offset.<br><br>SUBSTR function Returns part of the LOB value starting at the specified offset. <br><br>TRIM procedure Trims the LOB value to the specified shorter length. <br><br>WRITE procedure Writes data to the LOB from a specified offset. <br><br>WRITEAPPEND procedure Writes a buffer to the end of a LOB. <br></p></td>
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