在sqlplus中操作blob和clob

王朝mssql·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

Tom在他的《EXPert one on one Oracle》给出了sqlplus中将文件load进BLOB或者CLOB字段的例子。这里保存一份以备急用。

create Directory utllobdir as 'd:'

create table bloBTest(col1 BLOB);

create table clobtest(col1 cLOB);

--insert BLOB

declare

a_blob BLOB;

bfile_name BFILE := BFILENAME('ULTLOBDIR','teslob.doc');

begin

insert into blobtest values (empty_blob())

returning col1 into a_blob;

dbms_lob.fileopen(bfile_name);

dbms_lob.loadfromfile(a_blob, bfile_name, dbms_lob.getlength(bfile_name));

dbms_lob.fileclose(bfile_name);

commit;

end;

--update BLOB

declare

a_blob BLOB;

bfile_name BFILE := BFILENAME('ULTLOBDIR','log.txt');

begin

update blobtest set col1=empty_blob() where rownum=1

returning col1 into a_blob;

dbms_lob.fileopen(bfile_name);

dbms_lob.loadfromfile(a_blob, bfile_name, dbms_lob.getlength(bfile_name));

dbms_lob.fileclose(bfile_name);

commit;

end;

--insert CLOB

create table clobtest(col1 CLOB);

declare

a_clob CLOB;

bfile_name BFILE := BFILENAME('ULTLOBDIR','teslob.doc');

begin

insert into clobtest values (empty_clob())

returning col1 into a_clob;

dbms_lob.fileopen(bfile_name);

dbms_lob.loadfromfile(a_clob, bfile_name, dbms_lob.getlength(bfile_name));

dbms_lob.fileclose(bfile_name);

commit;

end;

--update CLOB

declare

a_clob CLOB;

bfile_name BFILE := BFILENAME('ULTLOBDIR','log.txt');

begin

update clobtest set col1=empty_clob() where rownum=1

returning col1 into a_clob;

dbms_lob.fileopen(bfile_name);

dbms_lob.loadfromfile(a_clob, bfile_name, dbms_lob.getlength(bfile_name));

dbms_lob.fileclose(bfile_name);

commit;

end;

通过查看lob字段的长度判定是否插入成功

select dbms_lob.getlength(col1) from blobtest;

select dbms_lob.getlength(col1) from clobtest;

 
 
 
免责声明:本文为网络用户发布,其观点仅代表作者个人观点,与本站无关,本站仅提供信息存储服务。文中陈述内容未经本站证实,其真实性、完整性、及时性本站不作任何保证或承诺,请读者仅作参考,并请自行核实相关内容。
 
 
© 2005- 王朝網路 版權所有 導航