Oracle SQL? BLOB?? ??? ?? ??
Oracle SQL??? BLOB? ?? LOB(Large Object) ??? ?????. ???? ???? ?????. BLOB? ??? ???? ?????? ?? ??? ??? ? ????.
select utl_raw.cast_to_varchar2(dbms_lob.substr(BLOB_FIELD)) from TABLE_WITH_BLOB where ID = '<row id>';
??:
- utl_raw.cast_to_varchar2() : ???? BLOB ???? VARCHAR2 ???? ?????. ??? ???.
- dbms_lob.substr(): ??? ???? ???? BLOB? ?? ???? ?????.
- BLOB_FIELD: BLOB? ?? ???? ???? BLOB ? data.
- TABLE_WITH_BLOB: BLOB ?? ??? ???? ??.
- ID: BLOB ?? ?? ?? ?? ??? table.
?:
??? ??? ??? TEXT_FIELD?? BLOB ?? ?? MY_TABLE??? ???? ??? ???? ?? ??? ???? ?? 32767?? ?????:
select utl_raw.cast_to_varchar2(dbms_lob.substr(TEXT_FIELD)) from MY_TABLE where ID = 1;
? ??? Oracle SQL? BLOB?? ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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