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和记娱h188下载app手机版:Oracle如何对CLOB行字段执行全文检索



大年夜家知道,跨越4000字的文本一样平常存储在CLOB中(MSQL、Sysbase是寄放在Text中),在今朝的Oracle版本(Oracle8i)和记娱h188下载app手机版中,对大年夜字段CLOB仍旧不支持在where子句直接的like操作,若何实现对存储在CLOB字段中的内容进行like查找呢?下面的文章或则能给你赞助。虽然在SQL*PLUS中能实现用select直接看到CLOB的内容,然则若何经由过程DBMS_LOB包实现对中文情况下的CLOB内容的读取我不停没有找到好的措施(应用Documents中提到的Samples只适用英翰墨符集),这极大年夜的限定了应用第3方软件开拓事情的自由度。假如那位仁兄有高着儿盼望Email给我。

表布局:create table products(

productid number(10) not null ,

name varchar2(255) 和记娱h188下载app手机版,

description CLOB) ;

措施:SELECT productid, name FROM products

WHERE dbms_lob.instr(products.description,′some text′,1,1) > 0;

下面列出了DBMS_LOB包中的历程函数:

APPEND procedure Appends the contents of the source LOB to the destination LOB.

CLOSE proce和记娱h188下载app手机版dure Closes a previously opened internal or external LOB.

COMPARE function Compares two entire LOBs or parts of two LOBs.

COPY procedure Copies all, or part, of the source LOB to the destination LOB.

CREATETEMPORARY procedure Creates a temporary BLOB or CLOB and its corresponding index in the user′s default temporary tablespace.

ERASE procedure Erases all or part of a LOB.

FILECLOSE procedure Closes the file.

FILECLOSEALL procedure Closes all previously opened files.

FILEEXISTS function Checks if the file exists on the server.

FILEGETNAME procedure Gets the directory alias and file name.

FILEISOPEN function Checks if the file was opened using the input BFILE locators.

FILEOPEN procedure Opens a file.

FREETEMPORARY procedure Frees the temporary BLOB or CLOB in the user′s default temporary tablespace.

GETCHUNKSIZE function Returns the amount of space used in the LOB chunk to store the LOB value.

GETLENGTH function Gets the length of the LOB value.

INSTR function Returns the matching position of the nth occurrence of the pattern in the LOB.

ISOPEN function Checks to see if the LOB was already opened using the input locator.

ISTEMPORARY function Checks if the locator is pointing to a temporary LOB.

LOADFROMFILE procedure 和记娱h188下载app手机版Loads BFILE d和记娱h188下载app手机版ata into an internal LOB.

OPEN procedure Opens a LOB (internal, external, or temporary) in the indicated mode.

READ procedure Reads data from the LOB starting at the specified offset.

SUBSTR function Returns part of the LOB value starting at the specified offset.

TRIM procedure Trims the LOB value to the specified shorter length.

WRITE procedure Writes data to the LOB from a specified offset.

WRITEAPPEND procedure Writes a buffer to the end of a LOB.

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