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如何從XML抽取值並將其插入表中？

2017-01-10 89 views
0

我已經得到了我加載到XMLType的變量中的XML文件，我想從不同的屬性值幾個.../ExtendedData/SchemaData/SimpleData節點提取不同的值，並且.../Polygon/outerBoundaryIs/LinearRing/coordinates節點，在這個表中插入他們：如何從XML抽取值並將其插入表中？

CREATE TABLE LIE_GEOF 
(
IDE_GEO VARCHAR2(24) NOT NULL, 
COD_COM VARCHAR2(3) , 
COD_VIL VARCHAR2(5) , 
NOM_COM VARCHAR2(50) , 
ALT_MOY NUMBER(4,0) , 
SUP_HEC NUMBER(12,0) , 
NBR_POP NUMBER(10,0) , 
COD_ARR VARCHAR2(1) , 
COD_DEP VARCHAR2(2) , 
NOM_DEP VARCHAR2(30) , 
COD_REG VARCHAR2(2) NOT NULL, 
NOM_REG VARCHAR2(35) NOT NULL, 
TXT_POL CLOB , 
CONSTRAINT LIE_GEOF_PK PRIMARY KEY (IDE_GEO) USING INDEX 
);

插入必須遵循這樣的規則：與特定的屬性值/Document/Folder/Placemark/ExtendedData/SchemaData/SimpleData節點

  • 值進入表中的11個域。
  • 節點/Document/Folder/Placemark/Polygon/outerBoundaryIs/LinearRing/coordinates的值進入該表的最後一個字段（TXT_POL，這是一個CLOB）。

例如，插入：

  • COMMUNE00000000000000001爲ID_GEOFLA
  • 216到COD_COM
  • ...
  • 0.523147623541907,43.45799199978569 0.523016926446493,43.458214941462735 ......到TXT_POL

這是我的XML文件：

<?xml version="1.0" encoding="utf-8" ?> 
<kml xmlns="http://www.opengis.net/kml/2.2"> 
<Document id="root_doc"> 
<Schema name="COMMUNE" id="COMMUNE"> 
<SimpleField name="ID_GEOFLA" type="string"></SimpleField> 
<SimpleField name="CODE_COM" type="string"></SimpleField> 
<SimpleField name="INSEE_COM" type="string"></SimpleField> 
<SimpleField name="NOM_COM" type="string"></SimpleField> 
<SimpleField name="STATUT" type="string"></SimpleField> 
<SimpleField name="X_CHF_LIEU" type="int"></SimpleField> 
<SimpleField name="Y_CHF_LIEU" type="int"></SimpleField> 
<SimpleField name="X_CENTROID" type="int"></SimpleField> 
<SimpleField name="Y_CENTROID" type="int"></SimpleField> 
<SimpleField name="Z_MOYEN" type="int"></SimpleField> 
<SimpleField name="SUPERFICIE" type="float"></SimpleField> 
<SimpleField name="POPULATION" type="int"></SimpleField> 
<SimpleField name="CODE_ARR" type="string"></SimpleField> 
<SimpleField name="CODE_DEPT" type="string"></SimpleField> 
<SimpleField name="NOM_DEPT" type="string"></SimpleField> 
<SimpleField name="CODE_REG" type="string"></SimpleField> 
<SimpleField name="NOM_REG" type="string"></SimpleField> 
</Schema> 
<Folder><name>COMMUNE</name> 
<Placemark> 
<Style><LineStyle><color>ff0000ff</color></LineStyle><PolyStyle><fill>0</fill></PolyStyle></Style> 
<ExtendedData><SchemaData schemaUrl="#COMMUNE"> 
<SimpleData name="ID_GEOFLA">COMMUNE00000000000000001</SimpleData> 
<SimpleData name="CODE_COM">216</SimpleData> 
<SimpleData name="INSEE_COM">32216</SimpleData> 
<SimpleData name="NOM_COM">LOURTIES-MONBRUN</SimpleData> 
<SimpleData name="STATUT">Commune simple</SimpleData> 
<SimpleData name="X_CHF_LIEU">500820</SimpleData> 
<SimpleData name="Y_CHF_LIEU">6264958</SimpleData> 
<SimpleData name="X_CENTROID">500515</SimpleData> 
<SimpleData name="Y_CENTROID">6265413</SimpleData> 
<SimpleData name="Z_MOYEN">252</SimpleData> 
<SimpleData name="SUPERFICIE">966</SimpleData> 
<SimpleData name="POPULATION">139</SimpleData> 
<SimpleData name="CODE_ARR">3</SimpleData> 
<SimpleData name="CODE_DEPT">32</SimpleData> 
<SimpleData name="NOM_DEPT">GERS</SimpleData> 
<SimpleData name="CODE_REG">76</SimpleData> 
<SimpleData name="NOM_REG">LANGUEDOC-ROUSSILLON-MIDI-PYRENEES</SimpleData> 
</SchemaData></ExtendedData> 
<Polygon><outerBoundaryIs><LinearRing><coordinates>0.523147623541907,43.45799199978569 0.523016926446493,43.458214941462735 0.522819929792566,43.458571384907614 0.523158712137025,43.463844819851531 0.525919177622142,43.466722549687468 0.534681879985461,43.464747550783542 0.543836737927885,43.469777335356682 0.548247371718109,43.472768370413348 0.550322756594321,43.477287979477317 0.551468474597506,43.478160877453561 0.552015304755935,43.478439663216299 0.552453497415003,43.478221827985358 0.555100797978036,43.474481276701823 0.555807213328205,43.473593492995199 0.558991284076016,43.472423990577127 0.56086273814842,43.472185286329086 0.564888471150887,43.471711436291166 0.566623349308327,43.471515470873307 0.567427459167519,43.471439009340536 0.568571543995261,43.468291800893347 0.569365669469214,43.464620982438333 0.567828019844389,43.460101271732199 0.567509757649282,43.458423540573534 0.567072440746275,43.458596443463989 0.566331570343829,43.458584307788286 0.562627166751401,43.458262522540728 0.560416690686975,43.457911246027962 0.559805673058565,43.457721968280353 0.554192459548327,43.459256113328266 0.551822357433493,43.460071196874786 0.549836876685425,43.460442173041024 0.548786602838374,43.460469727487656 0.548449080291229,43.459430568250141 0.548216275147381,43.458572899197428 0.549999653359123,43.456795920024497 0.550686563685562,43.456536916638157 0.553860511528465,43.456050548180549 0.555937760797512,43.456713991749211 0.55612105137207,43.45676223078474 0.556436817751908,43.456542525872251 0.556441991370131,43.456362621910301 0.555847087361284,43.455678628111059 0.552874026887119,43.453652001502725 0.551053529573104,43.452678364660322 0.222253,43.452448351090517 0.550735797660037,43.451000593387143 0.550915991905762,43.449206264922303 0.553238100421676,43.447940984342978 0.553771683066166,43.447653300288636 0.554738707003582,43.44728268718503 0.56019111305528,43.444531605495072 0.562938636713414,43.443858069856788 0.56516268550633,43.443759562234121 0.567023409839381,43.443430527931177 0.566871862109568,43.442340715151943 0.566475653104936,43.44116529926356 0.566069176230466,43.440349687490794 0.564972682557216,43.439523066858889 0.564547029266048,43.439336180634278 0.562328585402901,43.439277281890504 0.559811880846763,43.438853383472782 0.557964223826497,43.438382404156521 0.557848915902549,43.438101676680482 0.557402040643657,43.436611852944097 0.556595818480535,43.436778188864331 0.550636409582979,43.43880112426811 0.546799103741674,43.440005028613726 0.543629269595757,43.4407612883318 0.543320674518776,43.44075609078584 0.54265340718862,43.440385418205821 0.542657248886231,43.44029549561.540784834255311,43.440578841341114 0.539476542216563,43.44101538502607 0.537977690329699,43.441574496966403 0.537598849484849,43.441882721780303 0.525443080131764,43.448439347839923 0.523192997567408,43.452635557123507 0.522863538404974,43.455264457764613 0.523286197033435,43.457500103439656 0.047392157,43.457948420812656 0.523147623541907,43.45799199978569</coordinates></LinearRing></outerBoundaryIs></Polygon> 
</Placemark> 
<Placemark> 
<Style><LineStyle><color>ff0000ff</color></LineStyle><PolyStyle><fill>0</fill></PolyStyle></Style> 
<ExtendedData><SchemaData schemaUrl="#COMMUNE"> 
<SimpleData name="ID_GEOFLA">COMMUNE00000000000000002</SimpleData> 
<SimpleData name="CODE_COM">033</SimpleData> 
<SimpleData name="INSEE_COM">47033</SimpleData> 
<SimpleData name="NOM_COM">BOUDY-DE-BEAUREGARD</SimpleData> 
<SimpleData name="STATUT">Commune simple</SimpleData> 
<SimpleData name="X_CHF_LIEU">516424</SimpleData> 
<SimpleData name="Y_CHF_LIEU">6384852</SimpleData> 
<SimpleData name="X_CENTROID">515575</SimpleData> 
<SimpleData name="Y_CENTROID">6385938</SimpleData> 
<SimpleData name="Z_MOYEN">112</SimpleData> 
<SimpleData name="SUPERFICIE">1019</SimpleData> 
<SimpleData name="POPULATION">414</SimpleData> 
<SimpleData name="CODE_ARR">3</SimpleData> 
<SimpleData name="CODE_DEPT">47</SimpleData> 
<SimpleData name="NOM_DEPT">LOT-ET-GARONNE</SimpleData> 
<SimpleData name="CODE_REG">75</SimpleData> 
<SimpleData name="NOM_REG">AQUITAINE-LIMOUSIN-POITOU-CHARENTES</SimpleData> 
</SchemaData></ExtendedData> 
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</Placemark> 
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<Style><LineStyle><color>ff0000ff</color></LineStyle><PolyStyle><fill>0</fill></PolyStyle></Style> 
<ExtendedData><SchemaData schemaUrl="#COMMUNE"> 
<SimpleData name="ID_GEOFLA">COMMUNE00000000000000003</SimpleData> 
<SimpleData name="CODE_COM">009</SimpleData> 
<SimpleData name="INSEE_COM">32009</SimpleData> 
<SimpleData name="NOM_COM">ARMOUS-ET-CAU</SimpleData> 
<SimpleData name="STATUT">Commune simple</SimpleData> 
<SimpleData name="X_CHF_LIEU">472979</SimpleData> 
<SimpleData name="Y_CHF_LIEU">6278963</SimpleData> 
<SimpleData name="X_CENTROID">473004</SimpleData> 
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<SimpleData name="Z_MOYEN">221</SimpleData> 
<SimpleData name="SUPERFICIE">932</SimpleData> 
<SimpleData name="POPULATION">95</SimpleData> 
<SimpleData name="CODE_ARR">3</SimpleData> 
<SimpleData name="CODE_DEPT">32</SimpleData> 
<SimpleData name="NOM_DEPT">GERS</SimpleData> 
<SimpleData name="CODE_REG">76</SimpleData> 
<SimpleData name="NOM_REG">LANGUEDOC-ROUSSILLON-MIDI-PYRENEES</SimpleData> 
</SchemaData></ExtendedData> 
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<ExtendedData><SchemaData schemaUrl="#COMMUNE"> 
<SimpleData name="ID_GEOFLA">COMMUNE00000000000000004</SimpleData> 
<SimpleData name="CODE_COM">225</SimpleData> 
<SimpleData name="INSEE_COM">38225</SimpleData> 
<SimpleData name="NOM_COM">AUTRANS-MEAUDRE EN VERCORS</SimpleData> 
<SimpleData name="STATUT">Commune simple</SimpleData> 
<SimpleData name="X_CHF_LIEU">898640</SimpleData> 
<SimpleData name="Y_CHF_LIEU">6450689</SimpleData> 
<SimpleData name="X_CENTROID">898625</SimpleData> 
<SimpleData name="Y_CENTROID">6451597</SimpleData> 
<SimpleData name="Z_MOYEN">1234</SimpleData> 
<SimpleData name="SUPERFICIE">3371</SimpleData> 
<SimpleData name="POPULATION">2973</SimpleData> 
<SimpleData name="CODE_ARR">1</SimpleData> 
<SimpleData name="CODE_DEPT">38</SimpleData> 
<SimpleData name="NOM_DEPT">ISERE</SimpleData> 
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<SimpleData name="NOM_REG">AUVERGNE-RHONE-ALPES</SimpleData> 
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</Placemark> 
<Placemark> 
<Style><LineStyle><color>ff0000ff</color></LineStyle><PolyStyle><fill>0</fill></PolyStyle></Style> 
<ExtendedData><SchemaData schemaUrl="#COMMUNE"> 
<SimpleData name="ID_GEOFLA">COMMUNE00000000000000005</SimpleData> 
<SimpleData name="CODE_COM">890</SimpleData> 
<SimpleData name="INSEE_COM">62890</SimpleData> 
<SimpleData name="NOM_COM">WILLEMAN</SimpleData> 
<SimpleData name="STATUT">Commune simple</SimpleData> 
<SimpleData name="X_CHF_LIEU">640049</SimpleData> 
<SimpleData name="Y_CHF_LIEU">7028672</SimpleData> 
<SimpleData name="X_CENTROID">640115</SimpleData> 
<SimpleData name="Y_CENTROID">7029900</SimpleData> 
<SimpleData name="Z_MOYEN">79</SimpleData> 
<SimpleData name="SUPERFICIE">1023</SimpleData> 
<SimpleData name="POPULATION">178</SimpleData> 
<SimpleData name="CODE_ARR">4</SimpleData> 
<SimpleData name="CODE_DEPT">62</SimpleData> 
<SimpleData name="NOM_DEPT">PAS-DE-CALAIS</SimpleData> 
<SimpleData name="CODE_REG">32</SimpleData> 
<SimpleData name="NOM_REG">NORD-PAS-DE-CALAIS-PICARDIE</SimpleData> 
</SchemaData></ExtendedData> 
<Polygon><outerBoundaryIs><LinearRing><coordinates>2.151357610477108,50.342723579428736 2.150582398840049,50.343853128809613 2.150439420398362,50.344345961981944 2.147781898036236,50.348429901247719 2.144643960903647,50.352848920107654 2.142170362713468,50.354312287967623 2.139785273502974,50.354442932204655 2.139147310728909,50.356057285129864 2.136459688875384,50.361894178627317 2.136303634967463,50.362073550534305 2.136457891197435,50.362163514907749 2.143309717417935,50.367975295072092 2.149574739686743,50.375379804640581 2.151353800635636,50.377701211726055 2.152307917736184,50.378321866071232 2.155756214194353,50.379913059929052 2.154864354931062,50.380685355552338 2.155973798477377,50.381259457705227 2.156409086307008,50.380669881870404 2.157182705972685,50.37999822017963 2.158308050333875,50.379282265278022 2.159644626590358,50.378610832073001 2.166473449179359,50.37565036238319 2.167106098271396,50.375426588179472 2.167893230445291,50.375114070985006 2.168055448620143,50.374896996422471 2.168526372902896,50.37426272358401 2.169092409895663,50.373051795846251 2.169942448266939,50.370531964916502 2.170719245301723,50.368962416427962 2.175080979569476,50.369372312649269 2.183859825720376,50.370773789773402 2.18505079929214,50.370999825609218 2.185191902200479,50.370954968509238 2.18564361921614,50.370190318886401 2.184787545948869,50.370002412843633 2.183708661363136,50.369617304240514 2.182463727449356,50.36830454074083 2.181402963860765,50.366544971983508 2.182476664280656,50.364123484539761 2.185726357443533,50.356526912933504 2.186427269755563,50.356662618447764 2.186638577991434,50.356438655774838 2.187202454197396,50.355496954539362 2.188401939261542,50.353075312390636 2.186319206527587,50.348124388463035 2.184784410495321,50.343586432428438 2.184713679145266,50.343361503403536 2.18317169343704,50.343538954992638 2.166941973276032,50.344953195994378 2.152128396725606,50.342859066974349 2.151357610477108,50.342723579428736</coordinates></LinearRing></outerBoundaryIs></Polygon> 
</Placemark> 
</Folder> 
</Document></kml>

我到目前爲止所嘗試的是提取匹配屬性ID_GEOFLA的節點值;但這不起作用：

CREATE OR REPLACE PROCEDURE load_xml (p_dir  IN VARCHAR2, 
            p_filename IN VARCHAR2) AS 
l_bfile BFILE := BFILENAME(p_dir, p_filename); 
l_clob CLOB; 
xml_data xmltype; 
ID_GEOFLA varchar2(255); 

BEGIN 

DBMS_LOB.createtemporary (l_clob, TRUE); 
DBMS_LOB.fileopen(l_bfile, DBMS_LOB.file_readonly); 
DBMS_LOB.loadfromfile(l_clob, l_bfile, DBMS_LOB.getlength(l_bfile)); 
DBMS_LOB.fileclose(l_bfile); 

xml_data :=XMLTYPE.createXML(l_clob); 

for x in (

select a.ID 
from 
    XMLTABLE('/Document/Folder/Placemark/ExtendedData/SchemaData' 
      PASSING xml_data 
      COLUMNS ID VARCHAR2(100) PATH '//SimpleData/text()' 

     ) a) loop 
     dbms_output.put_line(x.ID); 

     end loop; 

    DBMS_LOB.freetemporary (l_clob); 

    END; 
/

如何將XML數據存入我的表中？

來源

2017-01-10 ITE

回答

1

您有多個位置需要XMLTable XPath來引用它們;然後將柱的路徑來指代每個節點，指定的屬性在相關：

xmltable(xmlnamespaces(default 'http://www.opengis.net/kml/2.2'), 
    '/kml/Document/Folder/Placemark' 
    passing xmltype(l_clob) 
    columns ide_geo varchar2(24) path 'ExtendedData/SchemaData/SimpleData[@name="ID_GEOFLA"]', 
    cod_com varchar2(3) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_COM"]', 
    cod_vil varchar2(5) path 'ExtendedData/SchemaData/SimpleData[@name="INSEE_COM"]', 
    nom_com varchar2(50) path 'ExtendedData/SchemaData/SimpleData[@name="NOM_COM"]', 
    alt_moy number(4,0) path 'ExtendedData/SchemaData/SimpleData[@name="Z_MOYEN"]', 
    sup_hec number(12,0) path 'ExtendedData/SchemaData/SimpleData[@name="SUPERFICIE"]', 
    nbr_pop number(10,0) path 'ExtendedData/SchemaData/SimpleData[@name="POPULATION"]', 
    cod_arr varchar2(1) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_ARR"]', 
    cod_dep varchar2(2) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_DEPT"]', 
    nom_dep varchar2(30) path 'ExtendedData/SchemaData/SimpleData[@name="NOM_DEPT"]', 
    cod_reg varchar2(2) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_REG"]', 
    nom_reg varchar2(35) path 'ExtendedData/SchemaData/SimpleData[@name="NOM_REG"]', 
    txt_pol clob path 'Polygon/outerBoundaryIs/LinearRing/coordinates' 
);

還要注意列入/kml根節點，和一個缺省名稱空間的聲明。

適應您的程序來使用，與從BFILE加載的CLOB，並配有單insert ... select（沒有光標需要的環路），你可以這樣做：

create or replace procedure load_xml (p_dir in varchar2, 
    p_filename in varchar2) 
as 
    l_clob clob; 
    l_bfile bfile := bfilename(p_dir, p_filename); 
    l_dest_offset pls_integer := 1; 
    l_src_offset pls_integer := 1; 
    l_lang_context pls_integer := 0; 
    l_warning pls_integer; 
begin 
    dbms_lob.createtemporary (l_clob, true); 
    dbms_lob.fileopen(l_bfile, dbms_lob.file_readonly); 
    dbms_lob.loadclobfromfile(dest_lob=>l_clob, 
    src_bfile=>l_bfile, 
    amount=>dbms_lob.lobmaxsize, 
    dest_offset=>l_dest_offset, 
    src_offset=>l_src_offset, 
    bfile_csid=>0, 
    lang_context=>l_lang_context, 
    warning=>l_warning); 
    dbms_lob.fileclose(l_bfile); 

    insert into lie_geof (ide_geo, cod_com, cod_vil, nom_com, alt_moy, sup_hec, 
    nbr_pop, cod_arr, cod_dep, nom_dep, cod_reg, nom_reg, txt_pol) 
    select ide_geo, cod_com, cod_vil, nom_com, alt_moy, sup_hec, 
    nbr_pop, cod_arr, cod_dep, nom_dep, cod_reg, nom_reg, txt_pol 
    from xmltable(xmlnamespaces(default 'http://www.opengis.net/kml/2.2'), 
    '/kml/Document/Folder/Placemark' 
    passing xmltype(l_clob) 
    columns ide_geo varchar2(24) path 'ExtendedData/SchemaData/SimpleData[@name="ID_GEOFLA"]', 
     cod_com varchar2(3) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_COM"]', 
     cod_vil varchar2(5) path 'ExtendedData/SchemaData/SimpleData[@name="INSEE_COM"]', 
     nom_com varchar2(50) path 'ExtendedData/SchemaData/SimpleData[@name="NOM_COM"]', 
     alt_moy number(4,0) path 'ExtendedData/SchemaData/SimpleData[@name="Z_MOYEN"]', 
     sup_hec number(12,0) path 'ExtendedData/SchemaData/SimpleData[@name="SUPERFICIE"]', 
     nbr_pop number(10,0) path 'ExtendedData/SchemaData/SimpleData[@name="POPULATION"]', 
     cod_arr varchar2(1) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_ARR"]', 
     cod_dep varchar2(2) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_DEPT"]', 
     nom_dep varchar2(30) path 'ExtendedData/SchemaData/SimpleData[@name="NOM_DEPT"]', 
     cod_reg varchar2(2) path 'ExtendedData/SchemaData/SimpleData[@name="CODE_REG"]', 
     nom_reg varchar2(35) path 'ExtendedData/SchemaData/SimpleData[@name="NOM_REG"]', 
     txt_pol clob path 'Polygon/outerBoundaryIs/LinearRing/coordinates' 
); 

    dbms_lob.freetemporary (l_clob); 
end; 
/

...當它與您的文件運行得到：

select * from lie_geof; 

IDE_GEO     COD COD_V NOM_COM            ALT_MOY SUP_HEC NBR_POP C CO NOM_DEP      CO NOM_REG        TXT_POL                   
------------------------ --- ----- -------------------------------------------------- ---------- ---------- ---------- - -- ------------------------------ -- ----------------------------------- -------------------------------------------------------------------------------- 
COMMUNE00000000000000001 216 32216 LOURTIES-MONBRUN           252  966  139 3 32 GERS       76 LANGUEDOC-ROUSSILLON-MIDI-PYRENEES 0.523147623541907,43.45799199978569 0.523016926446493,43.458214941462735 0.52281 
COMMUNE00000000000000002 033 47033 BOUDY-DE-BEAUREGARD          112  1019  414 3 47 LOT-ET-GARONNE     75 AQUITAINE-LIMOUSIN-POITOU-CHARENTES 0.662777282430262,44.533218568792947 0.662625822063777,44.533683684987352 0.6641 
COMMUNE00000000000000003 009 32009 ARMOUS-ET-CAU            221  932   95 3 32 GERS       76 LANGUEDOC-ROUSSILLON-MIDI-PYRENEES 0.211253773793326,43.587275605450763 0.211662108609333,43.586825129365288 0.2114 
COMMUNE00000000000000004 225 38225 AUTRANS-MEAUDRE EN VERCORS        1234  3371  2973 1 38 ISERE       84 AUVERGNE-RHONE-ALPES    5.577223028135769,45.242894349342798 5.57832596943672,45.243222059527241 5.57940 
COMMUNE00000000000000005 890 62890 WILLEMAN             79  1023  178 4 62 PAS-DE-CALAIS     32 NORD-PAS-DE-CALAIS-PICARDIE   2.151357610477108,50.342723579428736 2.150582398840049,50.343853128809613 2.1504

來源

2017-01-10 10:18:08

+0

非常感謝亞歷克斯！現在的問題是，我的真實文件是119兆字節，並且腳本運行了3個多小時，我真的認爲在生產環境中使用它是完全不明智的...... – ITE

+0

假設這些數據量不會經常加載和解析？你可以（也許在其他地方）在循環中運行查詢部分而不用插入，看看我們花在XML上的時間以及插入的時間。您的DBA可能能夠就任何瓶頸提供建議。另一個選擇可能是將XML拆分爲CSV，然後加載爲外部表或通過SQL \ * Loader - 但最後的CLOB列會使這一點變得棘手，假設它實際上可能超過4k。 –

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