问题
How to export clob field data's in oracle sql developer. Currently clob field data's can't export in oracle sql developer.
回答1:
If you don't want to (or can't) export and import your data, and really want it as a set of insert statements, you can use SQL Developer's built-in formatting tools to automatically split your CLOBs into multiple chunks that are small enough to be valid as string literals, and then spool the result to a file:
spool clob_export.sql
select /*insert*/ * from your_table;
spool off
With more recent versions you can use the sqlformat command to control the output format without needing to modify the query; this is equivalent:
set sqlformat insert
spool clob_export.sql
select * from your_table;
spool off
The generated insert statements will look something like:
REM INSERTING into YOUR_TABLE
SET DEFINE OFF;
Insert into YOUR_TABLE (ID,CLOB_COLUMN) values (1,TO_CLOB('... up to 4k of characters with quotes escaped ...')
|| TO_CLOB('... up to 4k of characters with quotes escaped ...')
|| TO_CLOB('... up to 4k of characters with quotes escaped ...')
...
|| TO_CLOB('... up to 4k of characters with quotes escaped ...'));
回答2:
The following EXP_IMP_LOB package can export and import CLOB, NCLOB, BLOB type column data using simple SQL (text) files.
How to use:
first of all install the package onto both source and target schemas. To export run this select
select * from table( EXP_IMP_LOB.EXPORT('table_name','lob_column_name','condition') );
where the Table_Name and LOB_Column_Name define the data column and the optional Condition defines the the row or rows. If there is no condition, then every row data will be exported row by row.
Example:
select * from table( EXP_IMP_LOB.EXPORT('person','image','id=103' ) );
Result:
/******************************************************
TABLE :PERSON
COLUMN :IMAGE
ROW :103
******************************************************/
BEGIN
EXP_IMP_LOB.IMPORT_NEW;
EXP_IMP_LOB.IMPORT_APPEND ( 'FFD8FFE000104A464....23232323232');
EXP_IMP_LOB.IMPORT_APPEND ( '32323232323232323....798999AA2A3');
.........
EXP_IMP_LOB.IMPORT_APPEND ( 'B2316524267279AA9....51401FFFD9');
EXP_IMP_LOB.IMPORT_UPDATE ( 'PERSON','IMAGE','103' );
COMMIT;
END;
/
So, the export converts the binary data to 400 char length hexa strings and creates a script from it. I used ..... to symbolize many chars, because that is only a sample above.
DO NOT SORT THE RESULT!
To import, you only have to install the package onto the target schema too and run this script above in the target schema. That's all.
...more:
- The source and target table name, column name must be the same!
- The Table (both source and target) must have Primary key and they must be identical.
- The EXPORT function can detect the primary key automatically. Theoretically it can manage composed keys too...
- The size of a hexa string is defined in G_LENGTH global variable. 200 chars means 400 hexa chars.
- The additional procedures:
- IMPORT_NEW : resets the package variables to prepare it to accept a new LOB
- IMPORT_APPEND : converts the hexa string to a binary data and append it the package variable
- IMPORT_UPDATE : updates the given table, row, column with the package variable
- DIRECT_SQL : executes the given SQL using the global LOB variable as a parameter. eg: EXP_IMP_LOB.DIRECT_SQL( 'insert into ANY_TABLE ( ID, IMAGE ) values ( 123, :1 )' );
/*============================================================================================*/
create or replace package EXP_IMP_LOB is
/*============================================================================================*/
type T_STRING_LIST is table of varchar2( 32000 );
---------------------------------------------------------------------------
function EXPORT ( I_TABLE_NAME in varchar2
, I_COLUMN_NAME in varchar2
, I_WHERE in varchar2 default null
) return T_STRING_LIST pipelined;
---------------------------------------------------------------------------
---------------------------------------------------------------------------
procedure IMPORT_NEW;
---------------------------------------------------------------------------
---------------------------------------------------------------------------
procedure IMPORT_APPEND ( I_RAW in varchar2);
---------------------------------------------------------------------------
---------------------------------------------------------------------------
procedure DIRECT_SQL ( I_SQL in varchar2 );
---------------------------------------------------------------------------
---------------------------------------------------------------------------
procedure IMPORT_UPDATE ( I_TABLE_NAME in varchar2
, I_COLUMN_NAME in varchar2
, I_PK in varchar2
);
---------------------------------------------------------------------------
end;
/
/*============================================================================================*/
create or replace package body EXP_IMP_LOB is
/*============================================================================================*/
G_TABLE_NAME varchar( 40 );
G_COLUMN_NAME varchar( 40 );
G_COLUMN_TYPE varchar( 40 );
G_PK_KEY varchar( 4000 );
G_PK_LST varchar( 4000 );
G_LENGTH number := 200;
G_BLOB blob;
G_CLOB clob;
---------------------------------------------------------------------------
procedure GET_PK ( I_TABLE_NAME in varchar ) is
---------------------------------------------------------------------------
L_SEP varchar ( 40 ) := ',';
L_DATA_TYPE varchar2( 30 );
begin
G_PK_KEY := '';
G_PK_LST := '';
for L_A_PK in ( select COLUMN_NAME
from USER_CONSTRAINTS UC
, USER_CONS_COLUMNS DBC
where UC.CONSTRAINT_TYPE = 'P'
and DBC.CONSTRAINT_NAME = UC.CONSTRAINT_NAME
and DBC.TABLE_NAME = I_TABLE_NAME
order by position
)
loop
if nvl( length( G_PK_KEY ), 0 ) + length( L_A_PK.COLUMN_NAME ) < 4000 then
select DATA_TYPE into L_DATA_TYPE from user_tab_columns where table_name = G_TABLE_NAME and column_name = L_A_PK.COLUMN_NAME;
if instr( L_DATA_TYPE, 'CHAR') > 0 then
G_PK_KEY := G_PK_KEY||'''''''''||'||L_A_PK.COLUMN_NAME||'||''''''''||'''||L_SEP||'''||';
elsif instr( L_DATA_TYPE, 'DATE') > 0 then
G_PK_KEY := G_PK_KEY||'''TO_DATE(''''''||TO_CHAR('||L_A_PK.COLUMN_NAME||',''YYYY.MM.DD HH24:MI:SS'')||'''''',''''YYYY.MM.DD HH24:MI:SS'''')''||'''||L_SEP||'''||';
else
G_PK_KEY := G_PK_KEY||L_A_PK.COLUMN_NAME||'||'''||L_SEP||'''||';
end if;
G_PK_LST := G_PK_LST||L_A_PK.COLUMN_NAME||L_SEP;
end if;
end loop;
G_PK_KEY := substr( G_PK_KEY, 1, length( G_PK_KEY ) - ( 6 + length( L_SEP ) ) );
G_PK_LST := substr( G_PK_LST, 1, length( G_PK_LST ) - length(L_SEP));
end;
---------------------------------------------------------------------------
function EXPORT ( I_TABLE_NAME in varchar2
, I_COLUMN_NAME in varchar2
, I_WHERE in varchar2 default null
) return T_STRING_LIST pipelined is
---------------------------------------------------------------------------
V_BLOB blob;
V_CLOB clob;
V_CUR_SQL varchar( 32000 );
V_LOB_SQL varchar( 32000 );
V_RAW varchar( 32000 );
V_START number;
V_PK varchar( 4000 );
V_REC_SET sys_refcursor;
begin
G_TABLE_NAME := upper( trim( I_TABLE_NAME ) );
G_COLUMN_NAME := upper( trim( I_COLUMN_NAME ) );
GET_PK( G_TABLE_NAME );
select DATA_TYPE into G_COLUMN_TYPE from user_tab_columns where table_name = G_TABLE_NAME and column_name = G_COLUMN_NAME;
if G_COLUMN_TYPE not in ('CLOB','NCLOB','BLOB') then
raise_application_error ( -20001, 'The type of column '||I_COLUMN_NAME||' is not CLOB, NCLOB or BLOB' );
end if;
V_CUR_SQL := 'select '||G_PK_KEY||' from '||G_TABLE_NAME||' where '||nvl( I_WHERE, ' 1 = 1 ');
open V_REC_SET for V_CUR_SQL;
loop
fetch V_REC_SET into V_PK;
exit when V_REC_SET%notfound;
PIPE ROW( '/******************************************************' );
PIPE ROW( ' TABLE :'||G_TABLE_NAME );
PIPE ROW( ' COLUMN :'||G_COLUMN_NAME );
PIPE ROW( ' ROW :'||V_PK );
PIPE ROW( '******************************************************/' );
PIPE ROW( 'BEGIN' );
PIPE ROW( ' EXP_IMP_LOB.IMPORT_NEW;' );
V_LOB_SQL := 'select '||G_COLUMN_NAME||' from '||G_TABLE_NAME||' where ('||G_PK_LST||') in ( select '||V_PK||' from dual )';
if G_COLUMN_TYPE = 'BLOB' then
execute immediate V_LOB_SQL into V_BLOB;
if nvl( dbms_lob.getlength( V_BLOB ), 0 ) > 0 then
V_START := 1;
for L_I IN 1..ceil( dbms_lob.getlength( V_BLOB ) / G_LENGTH )
loop
V_RAW := dbms_lob.substr( V_BLOB, G_LENGTH, V_START );
PIPE ROW( ' EXP_IMP_LOB.IMPORT_APPEND ( '''||V_RAW||''');' );
V_START := V_START + G_LENGTH;
end loop;
PIPE ROW( ' EXP_IMP_LOB.IMPORT_UPDATE ( '''||G_TABLE_NAME||''','''||G_COLUMN_NAME||''','''||replace(V_PK,'''','''''')||''' ); ');
PIPE ROW( ' COMMIT;' );
end if;
else
execute immediate V_LOB_SQL into V_CLOB;
if nvl( dbms_lob.getlength( V_CLOB ), 0 ) > 0 then
V_START := 1;
for L_I IN 1..ceil( dbms_lob.getlength( V_CLOB ) / G_LENGTH )
loop
V_RAW := UTL_RAW.CAST_TO_RAW( dbms_lob.substr( V_CLOB, G_LENGTH, V_START ) );
PIPE ROW( ' EXP_IMP_LOB.IMPORT_APPEND ( '''||V_RAW||''');' );
V_START := V_START + G_LENGTH;
end loop;
PIPE ROW( ' EXP_IMP_LOB.IMPORT_UPDATE ( '''||G_TABLE_NAME||''','''||G_COLUMN_NAME||''','''||replace(V_PK,'''','''''')||''' ); ');
PIPE ROW( ' COMMIT;' );
end if;
end if;
PIPE ROW( 'END;' );
PIPE ROW( '/' );
PIPE ROW( ' ' );
end loop;
close V_REC_SET;
return;
end;
---------------------------------------------------------------------------
procedure IMPORT_NEW is
---------------------------------------------------------------------------
begin
G_BLOB := null;
G_CLOB := null;
end;
---------------------------------------------------------------------------
procedure IMPORT_APPEND ( I_RAW in varchar2 ) is
---------------------------------------------------------------------------
V_BLOB blob;
begin
V_BLOB := hextoraw( I_RAW );
if nvl( dbms_lob.getlength( V_BLOB ), 0 ) > 0 then
if nvl( dbms_lob.getlength( G_BLOB ), 0 ) = 0 then
G_BLOB := V_BLOB;
else
DBMS_LOB.APPEND( G_BLOB, V_BLOB );
end if;
end if;
end;
---------------------------------------------------------------------------
procedure DIRECT_SQL ( I_SQL in varchar2 ) is
---------------------------------------------------------------------------
begin
if nvl( dbms_lob.getlength( G_BLOB ), 0 ) > 0 then
execute immediate I_SQL using G_BLOB;
else
execute immediate I_SQL using G_CLOB;
end if;
commit;
end;
-- I downloaded this from the Net:
function clobfromblob( p_blob blob ) return clob is
l_clob clob;
l_dest_offsset integer := 1;
l_src_offsset integer := 1;
l_lang_context integer := dbms_lob.default_lang_ctx;
l_warning integer;
begin
if p_blob is null then
return null;
end if;
dbms_lob.createTemporary(lob_loc => l_clob
,cache => false);
dbms_lob.converttoclob(dest_lob => l_clob
,src_blob => p_blob
,amount => dbms_lob.lobmaxsize
,dest_offset => l_dest_offsset
,src_offset => l_src_offsset
,blob_csid => dbms_lob.default_csid
,lang_context => l_lang_context
,warning => l_warning);
return l_clob;
end;
---------------------------------------------------------------------------
procedure IMPORT_UPDATE ( I_TABLE_NAME in varchar2
, I_COLUMN_NAME in varchar2
, I_PK in varchar2
) is
---------------------------------------------------------------------------
V_SQL varchar( 32000 );
begin
G_TABLE_NAME := upper( trim( I_TABLE_NAME ) );
G_COLUMN_NAME := upper( trim( I_COLUMN_NAME ) );
GET_PK( G_TABLE_NAME );
select DATA_TYPE into G_COLUMN_TYPE from user_tab_columns where table_name = G_TABLE_NAME and column_name = G_COLUMN_NAME;
V_SQL := 'update '||I_TABLE_NAME||' set '||I_COLUMN_NAME||' = :1 where ('||G_PK_LST||') in ( select '||I_PK||' from dual )';
if G_COLUMN_TYPE in ( 'CLOB', 'NCLOB' ) then
G_CLOB := clobfromblob ( G_BLOB );
G_BLOB := null;
DIRECT_SQL( V_SQL );
elsif G_COLUMN_TYPE in ( 'BLOB' ) then
DIRECT_SQL( V_SQL );
end if;
end;
end;
/
回答3:
I was faced with this issue when tried to copy a table that has CLOB column from one database server to another. Oracle SQL Developer's "Tools > Copy Database" tool wasn't a good choice for me because I needed to have another name for the destination table, so I had to use "Tools > Export Database" which generates the insert statements for you in a .sql file if you choose so.
Steps I did:
Run this in the source DB:
SELECT someColumA, someColumB, SubStr(myClobColumn, 1, 4000) myClobColumn_part1, SubStr(myClobColumn, 4001, 8000) myClobColumn_part2, . . . SubStr(Clob_field, .., ..) Clob_field_partN, OtherColumns FROM YourTable ;Right click and export to a file, all insert statements would be written to a temporary table: EXPORT_TABLE.
Run that file in the destination DB server to create EXPORT_TABLE
Now, run this to import the first 4000 chars:
Insert Into YourDestinationTable(.., myClobColumn, ..) SELECT .., myClobColumn_part1, .. FROM EXPORT_TABLE ;Run this to append the rest of the Clob parts:
Update YourDestinationTable A set myClobColumn = myClobColumn || (Select myClobColumn_part2 From EXPORT_TABLE B Where B.tableKey = A.tableKey and myClobColumn_part2 is not null) ; Update YourDestinationTable A set myClobColumn = myClobColumn || (Select myClobColumn_part3 From EXPORT_TABLE B Where B.tableKey = A.tableKey and myClobColumn_part3 is not null) ; ...
till part N.
You're done.
回答4:
I have same problem when i try to export insert, fields that are clob or blob then it not included in insert query.
This is Problem due to insert limit that is not avail to clob datatype size.
Solution:
I export data in XML or PDF or loader or Json. Then i got data that is clob or blob.
Tools > Database Export > select connection > uncheck export DDl if you want only data > check export data > select format: XML > next > next > next > next >finish.
open file where you save that XML file and verify.
enjoy...
来源：https://stackoverflow.com/questions/42244941/how-to-export-clob-field-datas-in-oracle-sql-developer