在sqlplus中操作blob和clob

2024-07-21 02:32:57

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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;

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