oracle中long2 varchar怎么把long转换为varchar2

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sql> desc dbms_Metadata_util …... FUNCTION LONG2VARCHAR RETURNS VARCHAR2 Argument Name                  Type                    In/Out Default? ------------------------------ ----------------------- ------ -------- LENGTH                         NUMBER                  IN TAB                            VARCHAR2                IN COL                            VARCHAR2                IN ROW                            ROWID                   IN …...

create table t1 (name long); insert into t1 values(‘a’); insert into t1 values(‘b’); insert into t1 values(‘c’); commit;

sql> select sys.dbms_Metadata_util.long2varchar(100,'scott.t1','name',rowid) from scott.t1; SYS.DBMS_MetaDATA_UTIL.LONG2VARCHAR(100,'SCott.T1','NAME',ROWID) -------------------------------------------------------------------------------- a b c sql>  select * from scott.t1 where sys.dbms_Metadata_util.long2varchar(100,'scott.t1','name',rowid) = 'a'; NAME -------------------------------------------------------------------------------- a

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