Oracle BLOB data type

发布时间：2020-12-12 15:44:51 所属栏目：百科来源：网络整理

导读：Define BLOB SQL CREATE TABLE TESTTAB(A BLOB) INSERT BLOB SQL INSERT INTO TESTTAB VALUES(HEXTORAW('61626364'));SQL INSERT INTO TESTTAB VALUES(UTL_RAW.CAST_TO_RAW('ABCD'));SQL SELECT A FROM TESTTAB;A------------------------------------------

Define BLOB

SQL> CREATE TABLE TESTTAB(A BLOB)

INSERT BLOB

SQL> INSERT INTO TESTTAB VALUES(HEXTORAW('61626364'));
SQL> INSERT INTO TESTTAB VALUES(UTL_RAW.CAST_TO_RAW('ABCD'));

SQL> SELECT A FROM TESTTAB;
A
--------------------------------------------------------------------------------
61626364
41424344

Operate on BLOB

SQL> SELECT DBMS_LOB.SUBSTR(A) FROM TESTTAB;
DBMS_LOB.SUBSTR(A)
--------------------------------------------------------------------------------
61626364
41424344

SQL> SELECT DBMS_LOB.SUBSTR(A,DBMS_LOB.GETLENGTH(A) - 1) FROM TESTTAB;
DBMS_LOB.SUBSTR(A,DBMS_LOB.GETLENGTH(A)-1)
--------------------------------------------------------------------------------
616263
414243

SQL> SELECT UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(A)) FROM TESTTAB;

UTL_RAW.CAST_TO_VARCHAR2(DBMS_LOB.SUBSTR(A))
--------------------------------------------------------------------------------
abcd
ABCD

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