[20230531]insert blob数据类型.txt

[20230531]insert blob数据类型.txt

--//链接https://connor-mcdonald.com/2023/05/29/why-i-blog/ 提供插入blob数据类型的简单方法,测试看看.
--//正常插入要先插入一个empty_blob(),然后获得一个定位指针,使用dbms_lob.loadfromfile插入.

1.环境:
SCOTT@test01p> @ver1
PORT_STRING                    VERSION        BANNER                                                                               CON_ID
------------------------------ -------------- -------------------------------------------------------------------------------- ----------
IBMPC/WIN_NT64-9.1.0           12.2.0.1.0     Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production              0

2.建立测试:
SCOTT@test01p> create table t ( b blob);
Table created.

CREATE OR REPLACE DIRECTORY TMP_EXPDP AS 'D:\tmp\expdp\';
GRANT EXECUTE, READ, WRITE ON DIRECTORY TMP_EXPDP TO SCOTT WITH GRANT OPTION;

--//直接测试作者提供的方法:

SCOTT@test01p> insert into t values (to_blob(bfilename('TMP_EXPDP','export.log')));
1 row created.

SCOTT@test01p> commit ;
Commit complete.

3.验证是否正确.
--//在toad下执行:
select * from t;
--//另存为a.log文件

D:\tmp\expdp>diff a.log export.log
--//说明OK。

SCOTT@test01p> select to_char(b) from t;
TO_CHAR(B)
-----------------------------------------------------------------------------------------------------------------------------------------------
;;;
Export: Release 12.2.0.1.0 - Production on Sat Jan 21 22:49:47 2023

Copyright (c) 1982, 2017, Oracle and/or its affiliates.  All rights reserved.
;;;
Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Starting "SCOTT"."SYS_EXPORT_TABLE_01":  scott/a******@test01p directory=TMP_EXPDP tables=t dumpfile=t1.dmp access_method=external_table
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Processing object type TABLE_EXPORT/TABLE/TABLE
. . exported "SCOTT"."T"                                 2.855 MB  100000 rows
Master table "SCOTT"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SCOTT.SYS_EXPORT_TABLE_01 is:
  D:\TMP\EXPDP\T1.DMP
Job "SCOTT"."SYS_EXPORT_TABLE_01" successfully completed at Sat Jan 21 22:51:10 2023 elapsed 0 00:01:05

--//说明没有任何问题。尝试更大的文件8K,一样没有问题。