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Platform See
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HP [NOTE:62407.1]
Digital Unix [NOTE:62426.1]



Sequent PTX [NOTE:62415.1]
Sun Solaris [NOTE:62409.1]

Windows NT Maximum 4Gb files on FAT
Theoretical 16Tb on NTFS
** See [NOTE:67421.1] before using large files
on NT with ORACLE8
**2 There is a problem with DBVERIFY on 8.1.6
See [BUG:1372172]
**3 There is a problem with 8.1.6 / 8.1.7
where an autoextend to 4Gb can
cause a crash - see [BUG:1668488]

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BUGS? WHAT BUGS?
I may have painted a fairly rosy picture of the Oracle/NT environment. However, the NT



environment is no more immune to bugs than others.Although most bugs are either
noncritical or have workarounds or patches,you may encounter a few of them while
attempting to implement some of the features I've discussed. For example:
¡ñThe Oracle8 facility to shut down a service cleanly is not functional in Oracle8.0.3.0
(see Oracle Product Change Request #513414).
¡ñ Running in archivelog mode--and hence performing online backups--is not
supported in Oracle7.3.2.1 (see alert #10802099).
¡ñThe integration of Oracle logging into the NT performance monitor does not always
work without manual intervention (see Oracle Product Change Requests #556846 and
#520639).

ORACLE ON NT: HERE TO STAY
I've given you just a taste of Oracle administration under Windows NT. Oracle
administration is a big topic,and we've barely scratched the surface here. However,I think
you'll see that transitioning Oracle from Unix to N is neither particularly unpleasant nor
T
troublesome,although there are challenges.
Both Unix and NT are here to stay,at least for the foreseeable future. While Oracle
professionals who restrict themselves to the Unix environment will continue to be in
demand,those who embrace both environments will have access to a greater range of
Oracle installations and will experience greater variety in their professional lives. If you're
an Oracle professional,you owe it to yourself to be at least familiar with Oracle on NT.
Guy Harrison is an independent Oracle consultant specializing in Oracle development and
performance issues and author of Oracle SQL High Performance Tuning (Prentice Hall,
1997). He is currently working with Quest Software Inc. in Australia. You can contact Guy
at gharriso@werple.net.au or through his home page at werple.net.au/~gharriso/.

ÎÒÃÇ¾¿¾¹Ê¹ÓÃÊ²Ã´ÎÄ¼þÏµÍ³£¿

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FUNCTION execute_system(command VARCHAR2,
timeout NUMBER DEFAULT 10)
RETURN NUMBER IS

status NUMBER;
result VARCHAR2(20);
command_code NUMBER;
pipe_name VARCHAR2(30);
BEGIN
pipe_name := DBMS_PIPE.UNIQUE_SESSION_NAME;
DBMS_PIPE.PACK_MESSAGE('SYSTEM');
DBMS_PIPE.PACK_MESSAGE(pipe_name);
DBMS_PIPE.PACK_MESSAGE(command);
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RAISE_APPLICATION_ERROR(-20010,
'Execute_system: Error while sending. Status = ' || status);
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'Execute_system: Error while receiving.
Status = ' || status);
END IF;
/*»ñÈ¡·µ»Ø½á¹û */


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DBMS_PIPE.UNPACK_MESSAGE(result);
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'Execute_system: Done not received.');
END IF;

DBMS_PIPE.UNPACK_MESSAGE(command_code);
DBMS_OUTPUT.PUT_LINE('System command executed. result = ' ||
command_code);
RETURN command_code;
END execute_system;
/*stop ÊÇÈÃaemon Í£Ö¹
d */
PROCEDURE stop(timeout NUMBER DEFAULT 10) IS
status NUMBER;
BEGIN
DBMS_PIPE.PACK_MESSAGE('STOP');
status := DBMS_PIPE.SEND_MESSAGE('daemon', timeout);
IF status <> 0 THEN
'stop: error while sending. status = ' || status);
END IF;
END stop;
END daemon;

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EXEC SQL INCLUDE SQLCA;

EXEC SQL BEGIN DECLARE SECTION;
char *uid = "scott/tiger";/*ÔÚÕâ¸öµØ·½¸ÄÎªÄã×Ô¼º·ÃÎÊµÄÓÃ»§
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int status;
VARCHAR command[20];
VARCHAR value[2000];
VARCHAR return_name[30];
EXEC SQL END DECLARE SECTION;

void


OS

connect_error()
{
char msg_buffer[512];
int msg_length;
int buffer_size = 512;

EXEC SQL WHENEVER SQLERROR CONTINUE;
sqlglm(msg_buffer, &buffer_size, &msg_length);
printf("Daemon error while connecting:n");
printf("%.*sn", msg_length, msg_buffer);
printf("Daemon quitting.n");
exit(1);
}

void
sql_error()
{
char msg_buffer[512];
int msg_length;
int buffer_size = 512;

EXEC SQL WHENEVER SQLERROR CONTINUE;
sqlglm(msg_buffer, &buffer_size, &msg_length);
printf("Daemon error while executing:n");
printf("%.*sn", msg_length, msg_buffer);
printf("Daemon continuing.n");
}
main()
{
EXEC SQL WHENEVER SQLERROR DO connect_error();
EXEC SQL CONNECT :uid;
printf("Daemon connected.n");

EXEC SQL WHENEVER SQLERROR DO sql_error();
printf("Daemon waiting...n");
while (1) {
EXEC SQL EXECUTE
BEGIN
/*½ÓÊÕeamon ·¢À´µÄ×Ö·û
d */
:status := DBMS_PIPE.RECEIVE_MESSAGE('daemon');
IF :status = 0 THEN
/*È¡³ö×Ö·û */
DBMS_PIPE.UNPACK_MESSAGE(:command);
END IF;


OS

END;
END-EXEC;
IF (status == 0)
{
command.arr[command.len] = '0';
/*Èç¹ûÊÇ stop,¸Ã½ø³Ì¾ÍÍË³ö */
IF (!strcmp((char *) command.arr, "STOP"))
{
printf("Daemon exiting.n");
break;
}

ELSE IF (!strcmp((char *) command.arr, "SYSTEM"))
{
EXEC SQL EXECUTE
BEGIN
DBMS_PIPE.UNPACK_MESSAGE(:return_name);
DBMS_PIPE.UNPACK_MESSAGE(:value);
END;
END-EXEC;
value.arr[value.len] = '0';
printf("Will execute system command '%s'n", value.arr);
/*ÔËÐÐs ÃüÁî
o */
status = system(value.arr);
EXEC SQL EXECUTE
BEGIN
DBMS_PIPE.PACK_MESSAGE('done');
DBMS_PIPE.PACK_MESSAGE(:status);
:status := DBMS_PIPE.SEND_MESSAGE(:return_name);
END;
END-EXEC;

IF (status)
{
printf
("Daemon error while responding to system command.");
printf(" status: %dn", status);
}
}
ELSE
{
printf
("Daemon error: invalid command '%s' received.n",
command.arr);


OS

}
}
ELSE
{
printf("Daemon error while waiting for signal.");
printf(" status = %dn", status);
}
}
EXEC SQL COMMIT WORK RELEASE;
exit(0);
}


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--
-- free.sql
--
--To verify free space in tablespaces
--Minimum amount of free space
--document your thresholds:
--<tablespace_name> = <amount> m
--

SELECT tablespace_name, sum ( blocks ) as free_blk , trunc ( sum ( bytes ) /
(1024*1024) ) as free_m, max ( bytes ) / (1024) as big_chunk_k, count (*) as num_chunks
FROM dba_free_space
GROUP BY tablespace_name

1. Space.sql
--
-- space.sql
--
-- To check free, pct_free, and allocated space within a tablespace
--
-- 11/24/98

SELECT tablespace_name, largest_free_chunk
, nr_free_chunks, sum_alloc_blocks, sum_free_blocks
, to_char(100*sum_free_blocks/sum_alloc_blocks, '09.99') || '%'
AS pct_free
FROM ( SELECT tablespace_name
, sum(blocks) AS sum_alloc_blocks
FROM dba_data_files
GROUP BY tablespace_name
)
, ( SELECT tablespace_name AS fs_ts_name
, max(blocks) AS largest_free_chunk
, count(blocks) AS nr_free_chunks
, sum(blocks) AS sum_free_blocks
FROM dba_free_space
GROUP BY tablespace_name )
WHERE tablespace_name = fs_ts_name
2. analyze5pct.sql
--
-- analyze5pct.sql
--
-- To analyze tables and indexes quickly, using a 5% sample size
-- (do not use this script if you are performing the overnight



-- collection of volumetric data)
--
-- 11/30/98

BEGIN
dbms_utility.analyze_schema ( '&OWNER', 'ESTIMATE', NULL, 5 ) ;
END ;
/
3. nr_extents.sql
--
-- nr_extents.sql
--
-- To find out any object reaching <threshold>
-- extents, and manually upgrade it to allow unlimited
-- max_extents (thus only objects we *expect* to be big
-- are allowed to become big)
--
-- 11/30/98

SELECT e.owner, e.segment_type , e.segment_name , count(*) as nr_extents ,
s.max_extents
, to_char ( sum ( e.bytes ) / ( 1024 * 1024 ) , '999,999.90') as MB
FROM dba_extents e , dba_segments s
WHERE e.segment_name = s.segment_name
GROUP BY e.owner, e.segment_type , e.segment_name , s.max_extents
HAVING count(*) > &THRESHOLD
OR ( ( s.max_extents - count(*) ) < &&THRESHOLD )
ORDER BY count(*) desc

4. spacebound.sql
--
-- spacebound.sql
--
-- To identify space-bound objects. If all is well, no rows are returned.
-- If any space-bound objects are found, look at value of NEXT extent
-- size to figure out what happened.
-- Then use coalesce (alter tablespace <foo> coalesce;).
-- Lastly, add another datafile to the tablespace if needed.
--
-- 11/30/98

SELECT a.table_name, a.next_extent, a.tablespace_name
FROM all_tables a,
( SELECT tablespace_name, max(bytes) as big_chunk



FROM dba_free_space
GROUP BY tablespace_name ) f
WHERE f.tablespace_name = a.tablespace_name
AND a.next_extent > f.big_chunk

B. Ã¿Íí´¦Àí³ÌÐò

1. mk_volfact.sql
--
-- mk_volfact.sql (only run this once to set it up; do not run it nightly!)
--
-- -- Table UTL_VOL_FACTS

CREATE TABLE utl_vol_facts
(
table_name VARCHAR2(30),
num_rows NUMBER,
meas_dt DATE
)
TABLESPACE platab
STORAGE (
INITIAL 128k
NEXT 128k
PCTINCREASE 0
MINEXTENTS 1
MAXEXTENTS unlimited
)
/

-- Public Synonym

CREATE PUBLIC SYNONYM utl_vol_facts FOR &OWNER..utl_vol_facts
/

-- Grants for UTL_VOL_FACTS

GRANT SELECT ON utl_vol_facts TO public
/

2. analyze_comp.sql
--
-- analyze_comp.sql
--
BEGIN



sys.dbms_utility.analyze_schema ( '&OWNER','COMPUTE');
END ;
/
3. pop_vol.sql
--
-- pop_vol.sql
--
insert into utl_vol_facts
select table_name
, NVL ( num_rows, 0) as num_rows
, trunc ( last_analyzed ) as meas_dt
from all_tables -- or just user_tables
where owner in ('&OWNER') -- or a comma-separated list of owners
/
commit
/

C. Ã¿ÖÜ´¦Àí³ÌÐò

1. nextext.sql
--
-- nextext.sql
--
-- To find tables that don't match the tablespace default for NEXT extent.
-- The implicit rule here is that every table in a given tablespace should
-- use the exact same value for NEXT, which should also be the tablespace's
-- default value for NEXT.
--
-- This tells us what the setting for NEXT is for these objects today.
--
-- 11/30/98

SELECT segment_name, segment_type, ds.next_extent as Actual_Next
, dt.tablespace_name, dt.next_extent as Default_Next
FROM dba_tablespaces dt, dba_segments ds
WHERE dt.tablespace_name = ds.tablespace_name
AND dt.next_extent !=ds.next_extent
AND ds.owner = UPPER ( '&OWNER' )
ORDER BY tablespace_name, segment_type, segment_name

2. existext.sql
--
-- existext.sql
--



-- To check existing extents
--
-- This tells us how many of each object's extents differ in size from
-- the tablespace's default size. If this report shows a lot of different
-- sized extents, your free space is likely to become fragmented. If so,
-- this tablespace is a candidate for reorganizing.
--
-- 12/15/98

SELECT segment_name, segment_type
, count(*) as nr_exts
, sum ( DECODE ( dx.bytes,dt.next_extent,0,1) ) as nr_illsized_exts
, dt.tablespace_name, dt.next_extent as dflt_ext_size
FROM dba_tablespaces dt, dba_extents dx
WHERE dt.tablespace_name = dx.tablespace_name
AND dx.owner = '&OWNER'
GROUP BY segment_name, segment_type, dt.tablespace_name, dt.next_extent

3. No_pk.sql
--
-- no_pk.sql
--
-- To find tables without PK constraint
--
-- 11/2/98

SELECT table_name
FROM all_tables
WHERE owner = '&OWNER'
MINUS
SELECT table_name
FROM all_constraints
WHERE owner = '&&OWNER'
AND constraint_type = 'P'

4. disPK.sql
--
-- disPK.sql
--
-- To find out which primary keys are disabled
--
-- 11/30/98



SELECT owner, constraint_name, table_name, status
FROM all_constraints
WHERE owner = '&OWNER' AND status = 'DISABLED’ AND constraint_type = 'P'

5. nonuPK.sql
--
-- nonuPK.sql
--
-- To find tables with nonunique PK indexes. Requires that PK names
-- follow a naming convention. An alternative query follows that
-- does not have this requirement, but runs more slowly.
--
-- 11/2/98

SELECT index_name, table_name, uniqueness
FROM all_indexes
WHERE index_name like '&PKNAME%'
AND owner = '&OWNER' AND uniqueness = 'NONUNIQUE'

SELECT c.constraint_name, i.tablespace_name, i.uniqueness
FROM all_constraints c , all_indexes i
WHERE c.owner = UPPER ( '&OWNER' ) AND i.uniqueness = 'NONUNIQUE'
AND c.constraint_type = 'P' AND i.index_name = c.constraint_name

6. mkrebuild_idx.sql
--
-- mkrebuild_idx.sql
--
-- Rebuild indexes to have correct storage parameters
--
-- 11/2/98

SELECT 'alter index ' || index_name || ' rebuild '
, 'tablespace INDEXES storage '
|| ' ( initial 256 K next 256 K pctincrease 0 ) ; '
FROM all_indexes
WHERE ( tablespace_name != 'INDEXES'
OR next_extent != ( 256 * 1024 )
)
AND owner = '&OWNER'
/

7. datatype.sql



--
-- datatype.sql
--
-- To check datatype consistency between two environments
--
-- 11/30/98

SELECT
table_name,
column_name,
data_type,
data_length,
data_precision,
data_scale,
nullable
FROM all_tab_columns -- first environment
WHERE owner = '&OWNER'
MINUS
SELECT
table_name,
column_name,
data_type,
data_length,
data_precision,
data_scale,
nullable
FROM all_tab_columns@&my_db_link -- second environment
WHERE owner = '&OWNER2'
order by table_name, column_name

8. obj_coord.sql
--
-- obj_coord.sql
--
-- To find out any difference in objects between two instances
--
-- 12/08/98

SELECT object_name, object_type
FROM user_objects
MINUS
SELECT object_name, object_type
FROM user_objects@&my_db_link



Áù ²Î¿¼ÎÄÏ×
.
1. Loney, Kevin Oracle8 DBA Handbook
2. Cook, David Database Management from Crisis to Confidence
[http://www.orapub.com/]
3. Cox, Thomas B. The Database Administration Maturity Model


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²éÑ¯LOB µÄ
C PL/SQL º¯Êý£º getclob
create or replace function getclob(
table_name in varchar2,
field_id in varchar2,
field_name in varchar2,
v_id in number,
v_pos in number) return varchar2
is
lobloc clob;
buffer varchar2(32767);
amount number := 2000;
offset number := 1;
query_str varchar2(1000);
begin
query_str :='select '||field_name||' from '||table_name||' where '||field_id||'= :id ';
--initialize buffer with data to be found
EXECUTE IMMEDIATE query_str INTO lobloc USING v_id;
offset:=offset+(v_pos-1)*2000;
--read 2000 varchar2 from the buffer
dbms_lob.read(lobloc,amount,offset,buffer);
return buffer;
exception
when no_data_found then
return buffer;
end;
ÓÃ·¨ËµÃ÷£º
ÓÃ select getclob(table_name,field_id,field_name,v_id,v_pos) as partstr from dual;


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¿ÉÒÔ´Ó LOB ×Ö¶ÎÖÐÈ¡
C 2000 ¸ö×Ö·ûµ½
partstr ÖÐ£¬±àÒ»¸öÑ-»·¿ÉÒÔ°Ñ
partstr ×éºÏ³É
dbms_lob.getlength(field_name)³¤¶ÈµÄÄ¿±ê×Ö·û´®¡£

¶þ¡¢¶ÔÓÚÔÚÆäËû²»Í¬µÄ¿ª·¢»·¾³£¬ÀýÈç vc,vb,pb,java µÈ»·¾³ÏÂ¶Ô lob µÄ´¦Àí£¬´¦Àí·½
·¨²»¾¡ÏàÍ¬£¬ÔÚÕâÀï½«¼òÒª¾Ù¼¸¸öÀý×ÓÀ´ËµÃ÷²»ÔÚ µÄ´¦Àí¡£
oracle ¿ª·¢»·¾³ÏÂ¶Ô lob
£¨Ò»£©ÔÚ pb ÖÐµÄ´¦Àí
exampler 2.
string ls_path,ls_filename,ls_jhdh
long ll_num,ll_count,rtn
blob ole_blob
ll_num=dw_lb.getrow()
if ll_num>0 then ls_jhdh=dw_lb.object.ct_njhdh[ll_num]
select count(*) into :ll_count from sj_jh_jhfjb where ct_jhdlxbh='1' and ct_jhdh=:ls_jhdh
and ct_jdlxbh=:is_jdlx;
if ll_count>0 then
rtn=messagebox("ÌáÊ¾ ","ÊÇ·ñÒªÐÞ¸Ä´Ë¸½¼þ ",question!,yesno!,1)
if rtn=1 then
SELECTBLOB ct_jhfjnr INTO le_blob from sj_jh_jhfjb where ct_jhdlxbh='1' and
ct_jhdh=:ls_jhdh and ct_jdlxbh=:is_jdlx;
ole_1.objectdata =ole_blob
If ole_1.activate(offsite!) <> 0 Then
Messagebox("OLE Activate","²»ÄÜ¼¤»î ")
Return -1
end If
end if
else
messagebox("ÌáÊ¾ ","Ã»ÓÐ¸½¼þ ")
end if
end if
£¨¶þ£©ÔÚ vb ÖÐµÄ´¦Àí
ÔÚ ÖÐ´¦Àí´ó¶ÔÏó£¬Ò»°ã¿ÉÒÔÓÃ objects for ole)À´´¦Àí´ó¶ÔÏó¡£ÕâÀï½é
vb OO4O(oracle
ÉÜÒ»ÖÖ²»ÓÃ ´¦Àí´ó¶ÔÏóµÄ·½·¨¡£
0040 blob
ÏÂÃæÕâ¶Î³ÌÐò¿ÉÒÔ½«Ò»¸öÎÄ¼þ£¨ÎÄ±¾ÎÄ¼þ£¬ doc ÎÄ¼þ£¬Í¼ÏóÎÄ¼þµÈ£©±£´æµ½Êý¾Ý¿âÖÐ£¬
²¢¿ÉÒÔ½«Æä´ÓÊý¾Ý¿â¶Á³ö
ÐèÒªÁ½¸ö commandbutton
cmd1 Ãû³Æ cmdsave caption ±£´æ
cmd2 Ãû³Æ cmdread caption ¶ÁÈ¡
Ò»¸ö cmddialog ¿Ø¼þ
Í¬Ê±ÐèÒª´´½¨Ò»ÕÅ±í t_demo(×Ö¶Î ÀàÐÍ
id number,;×Ö¶Î ÀàÐÍ
text blob;)
exmple 3.
Option Explicit
Dim rn As ADODB.Connection
Public Function CreateDataSource(DataSource As String, UserID As String, Password As
String) As Boolean


lob£©

On Error GoTo DbConErr:
Set rn = New ADODB.Connection
With rn
.ConnectionString = "Provider=OraOledb.Oracle.1;" & _
"password=" & Password & ";" & _
"User ID =" & UserID & ";" & _
"Data Source=" & DataSource & ";" & _
"Locale Identifier=2052"
.Open
End With
CreateDataSource = True
Exit Function
DbConErr:
CreateDataSource = False
End Function

Private Sub cmdRead_Click()
Dim rs As New ADODB.Recordset
rs.ActiveConnection = rn
rs.LockType = adLockOptimistic
rs.CursorLocation = adUseClient
rs.Source = "select * from t_demo"
rs.Open
ComDlgDir.DialogTitle = "±£´æÎÄ¼þ "
ComDlgDir.Filter = "*.*"
ComDlgDir.ShowSave
Call BlobToFile(rs.Fields("text"), ComDlgDir.filename)
Set rs = Nothing
Exit Sub
Set rs = Nothing
End Sub

Private Sub cmdsave_Click()
Dim rs As New ADODB.Recordset
rs.ActiveConnection = rn
rs.LockType = adLockOptimistic
rs.CursorLocation = adUseClient
rs.Source = "select * from t_demo"
rs.Open
rs.AddNew
ComDlgDir.DialogTitle = "Ñ¡È¡ÎÄ¼þ"
ComDlgDir.ShowOpen
rs.Fields("id").Value = 1
If ComDlgDir.filename <> "" Then


lob£©

Call FileToBlob(rs.Fields("text"), ComDlgDir.filename)
rs.Update
End If
Set rs = Nothing
Exit Sub
Set rs = Nothing
End Sub

Private Sub Form_Load()
If Not CreateDataSource("sid", "systemp", "manager") Then
MsgBox "Connection failure!"
End If
End Sub

fld As ADODB.Field, filename As String, Optional ChunkSize As Long = 8192)
Dim fnum As Integer, bytesleft As Long, bytes As Long
Dim tmp() As Byte
If (fld.Attributes And adFldLong) = 0 Then
Err.Raise 1001, , "field doesn't support the GetChunk method."
End If
If Dir$(filename) = "" Then Err.Raise 53, , "File not found"
fnum = FreeFile
Open filename For Binary As fnum
bytesleft = LOF(fnum)
Do While bytesleft
bytes = bytesleft
If bytes > ChunkSize Then bytes = ChunkSize
ReDim tmp(1 To bytes) As Byte
Get fnum, , tmp
fld.AppendChunk tmp
bytesleft = bytesleft - bytes
Loop
Close #fnum
End Sub

Sub BlobToFile(fld As ADODB.Field, filename As String, Optional ChunkSize As Long =
8192)
Dim fnum As Integer, bytesleft As Long, bytes As Long
Dim tmp() As Byte
If (fld.Attributes And adFldLong) = 0 Then
Err.Raise 1001, , "field doesn't support the GetChunk method."
End If
If Dir$(filename) <> "" Then Kill filename
fnum = FreeFile


lob£©

Open filename For Binary As fnum
bytesleft = fld.ActualSize
Do While bytesleft
bytes = bytesleft
If bytes > ChunkSize Then bytes = ChunkSize
tmp = fld.GetChunk(bytes)
Put #fnum, , tmp
bytesleft = bytesleft - bytes
Loop
Close #fnum
End Sub
£¨Èý£©ÓÃ ´¦Àí jdbc lob
exmple 4.
Ê×ÏÈÊÇ Getting BLOB and CLOB Locators from a Result Set
// Select LOB locator into standard result set.
ResultSet rs =stmt.executeQuery ("SELECT blob_col, clob_col FROM lob_table");
while (rs.next())
{// Get LOB locators into Java wrapper classes.
oracle.jdbc2.Blob blob = (oracle.jdbc2.Blob)rs.getObject(1);
oracle.jdbc2.Clob clob = (oracle.jdbc2.Clob)rs.getObject(2);
[...process...]
}
È»ºóÊÇ BLOB data from BLOB locator.
Read
InputStream byte_stream = my_blob.getBinaryStream();
byte [] byte_array = new byte [10];
int bytes_read = byte_stream.read(byte_array);
ºÍ Writing BLOB Data
java.io.OutputStream outstream;
// read data into a byte array
byte[] data = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
// write the array of binary data to a BLOB
outstream = ((BLOB)my_blob).getBinaryOutputStream();
outstream.write(data);
»¹ÓÐassing a BLOB Locator to a Prepared Statement
P
OraclePreparedStatement ops = (OraclePreparedStatement)conn.prepareStatement
"INSERT INTO blob_table VALUES(?)");
ops.setBLOB(1, my_blob);
ops.execute();
×îºóÓ¦¸Ã×¢Òâ£º
insert µÄÊ±ºòÒ»¶¨ÒªÓÃ empty_blob()³õÊ¼»¯
stmt.execute ("insert into my_blob_table values ('row1', empty_blob()");

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pro*c
PRO*C ¿ÉÒÔÓÃÈýÖÖ·½Ê½¶Ô
LOB ×Ö¶Î´¦Àí¡£


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1¡¢ The DBMS_LOB package inside PL/SQL blocks.
2¡¢ OCI (Oracle Call Interface) function calls.
3¡¢ Embedded SQL statements.
Embedded SQL statements.µÄ·½Ê½¼òµ¥¶øÇÒ±È½ÏÁé»î¡£ OTN ÉÏÌá¹©Ò»¸öÀý×Ó£º
In this example we will be reading data from a BLOB with an unknown arbitrary length into
a buffer and then writing the data from the buffer into an external file.
Our buffer is small, so depending on the size of the BLOB we are reading, we may
be able to read the BLOB value into the buffer in a single READ statement or we
may be required to utilize a standard polling method instead.
First we start off with oci.h and some simple local variable declarations
example 5.
#include <oci.h>
OCIBlobLocator *blob ;
FILE *fp ;
unsigned int amt, offset = 1 ;
Now we need a buffer to store the BLOB value and then write to the file from:
#define MAXBUFLEN 5000
unsigned char buffer[MAXBUFLEN] ;
EXEC SQL VAR buffer IS RAW(MAXBUFLEN) ;
Allocate the BLOB host variable and select a BLOB which we will READ:
EXEC SQL ALLOCATE :blob ;
EXEC SQL SELECT a_blob INTO :blob FROM lob_table WHERE ... ;
We can then open the external file to which we will write the BLOB value:
fp = fopen((const char *)"image.gif", (const char *)"w") ;
If the buffer can hold the entire LOB value in a single READ we need to catch the
NOT FOUND condition to signal LOB READ termination:
EXEC SQL WHENEVER NOT FOUND GOTO end_of_lob ;
Now do our first READ.We set the amount to the maximum value of 4 Gigabytes. It
is larger than our buffer so if the LOB doesn’fit we will READ using a polling
t
mode:
amt = 4294967295 ;
EXEC SQL LOB READ :amt FROM :blob AT ffset INTO :buffer ;
If we get here then it means that the buffer was not large enough to hold the entire
LOB value, so we must write what we have using binary I/O and continue reading:
(void) fwrite((void *)buffer, (size_t)MAXBUFLEN, (size_t)1, fp) ;
We use a standard polling method to continue reading with the LOB READ inside
of an infinite loop. We can set up the NOT FOUND condition to terminate the loop:
EXEC SQL WHENEVER NOT FOUND DO break ;
while (TRUE)
{
During polling, the offset is not used so we can omit it in subsequent LOB READs.
We need the amount, however, because it will tell us how much was READ in the
last READ invocation
EXEC SQL LOB READ :amt FROM :blob INTO :buffer ;


lob£©

(void) fwrite((void *)buffer, (size_t)MAXBUFLEN, (size_t)1, fp) ;
}
Here, we have reached the end of the LOB value. The amount holds the amount of
the last piece that was READ. During polling, the amount for each interim piece
was set to MAXBUFLEN, or the maximum size of our buffer:
end_of_lob:
(void) fwrite((void *)buffer, (size_t)amt, (size_t)1, fp) ;

£¨Îå£©ÔÚ delphi ÖÐµÄ´¦Àí
¶ÔÓÚ ×Ö¶Î¶øÑÔ£¬¸öÈËÈÏÎªÆäÊ¹ÓÃ±È
lob long ÀàÐÍÓÐºÜ´óµÄÁé»îÐÔ£¬¶øÇÒ
lob ×Ö¶Î¿ÉÒÔ±£´æ¸÷
ÀàµÄÊý¾Ý£¬¿ÉÒÔ±£´æÍ¼Æ¬£¬´óÁ¿µÄÎÄ×Ö£¬ÏÖ¾Í clob ¸úblob Á½ÖÖÀàÐÍ¼ÓÒÔËµÃ÷£¬ÆäÖÐ
blob
±£´æÍ¼Æ¬ÐÅÏ¢£¬ clob ±£´æ´óÁ¿ÎÄ×Ö¡£
exmple 6.
Create table test_table
(c_no number(1) not null,
c_blob blob,
c_clob clob,
constraint pk_test_table primary key (c_no));

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, DBCtrls, Grids, DBGrids, DB, DBTables, ExtDlgs;

type
TForm1 = class(TForm)
Database1: TDatabase; //ÓÃÓÚÁ¬½ÓÊý¾Ý¿â
Table1: TTa ble; //»ñÈ¡±íÐÅÏ¢
DataSource1: TDataSource;
DBGrid1: TDBGrid;
DBMemo1: TDBMemo; //ÏÔÊ¾ c_clob ×Ö¶ÎÄÚÈÝ
DBImage1: TDBImage; //ÏÔÊ¾ c_blob ×Ö¶ÎÄÚÈÝ
Button1: TButton; //²åÈë°´Å¥
Button2: TButton; //±£´æ°´Å¥
Table1C_NO: TFloatField; //Tfiled
Table1C_BLOB: TBlobField;
Table1C_CLOB: TMemoField;
OpenPictureDialog1: TOpenPictureDialog; //´ÓÎÄ¼þ»ñÈ¡Í¼Æ¬
OpenDialog1: TOpenDialog; //´ÓÎÄ¼þ»ñÈ¡ÎÄ×Ö
procedure Button1Click(Sender: TObject);


lob£©

procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin //²åÈë²Ù×÷
with Table1 do
begin
Insert; //½«±í×´Ì¬ÖÃÎª²åÈë×´Ì¬
if OpenPictureDialog1.Execute then //»ñµÃÍ¼Æ¬ÐÅÏ¢
Table1C_BLOB.LoadFromFile(OpenPictureDialog1.FileName);
if OpenDialog1.Execute then //»ñµÃÎÄ×ÖÐÅÏ¢
Table1C_CLOB.LoadFromFile(OpenDialog1.FileName);
end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin //Ìá½»²åÈëÄÚÈÝ
try
Table1.Post;
except
Application.MessageBox('´íÎó·¢Éú ',0);
','¾¯¸æ
end;
end;

end.

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dmp,ico,wmf µÈÎÄ¼þ£¬ÊÂÏÈÐèÒª½«Í¼Æ¬ÎÄ¼þ¸ñÊ½±£´æ³ÉÕ
¼¸Àà£»
ÔÚÎÄ×Ö×Ö¶Î²»´ÓÎÄ¼þ»ñµÃÊ±£¬¿ÉÒÔÊÖ¶¯ÊäÈë¡£
±¾ÀýÖ»ÊÇ¶Ô lob ×Ö¶ÎµÄÒ»¸öÐ¡Ð¡µÄÌ½Ë÷£¬ÓÃ·¨²»µ±¼°Ðè¸ÄÕýÖ®´¦£¬»¹Çë¶à¶àÖ

×¢
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