注冊XML Schema到ORACLE XDB可以方便生成XML的驗證。

What is an XML Schema?

An XML Schema is a language for expressing constraints about XML documents. There are several different schema languages in widespread use, but the main ones are Document Type Definitions (DTDs), Relax-NG, Schematron and W3C XSD (XML Schema Definitions). From this page you can find out more about DTDs and W3C XSD, since those are the primary schema languages defined at W3C.

the schema file ("shiporder.xsd"):

解鎖xdb帳號，在xdb下注冊xsd:

SQL> conn / as sysdba

Connected as SYS

SQL> alter user xdb account unlock identified by ******;

User altered

SQL> conn xdb/oracle;

Connected as xdb

使用DBMS_XMLSCHEMA.REGISTERSCHEMA注冊xsd注冊到xdb:

SQL> begin

dbms_xmlschema.registerschema(schemaurl => 'shiporder.xsd'

,schemadoc => bfilename('XMLDIR', 'shiporder.xsd')

,local => false

,gentypes => true

,genbean => false

,gentables => false

,force => false

,owner => 'XDB');

end;

/

PL/SQL procedure successfully completed

其中'XMLDIR'是ORACLE目錄對象名，shiporder.xsd文件在這個目錄下。

查看注冊對象狀態：

SQL> select s.schema_url, o.object_type, o.status

from user_xml_schemas s, user_objects o

where s.int_objname = o.object_name;

SCHEMA_URL OBJECT_TYPE STATUS

-------------------------------------------------- ------------------- -------

shiporder.xsd XML SCHEMA VALID

對于一些schema定義有遞歸引用，可能報錯不能注冊成功。參數force設為true強制注冊，然后再進行編譯。

SQL> DBMS_XMLSCHEMA.COMPILESCHEMA(schemaurl => 'shiporder.xsd');

DBMS_XMLSCHEMA.REGISTERSCHEMA有多種實現，詳細說明參見官方文檔。

注冊之后可以驗證xml文件了：

SQL> declare

v_xmldoc xmltype;

v_valid number;

begin

v_xmldoc := xmltype('<?xml version="1.0" encoding="UTF-8"?>

String

String

String

String

String

String

2

0.0

');

select v_xmldoc.isschemavalid('shiporder.xsd', 'shiporder') into v_valid from dual;

dbms_output.put_line('validate result is :' || v_valid);

if (v_valid <> 1) then

v_xmldoc.schemavalidate;

end if;

end;

/

validate result is :1

v_xmldoc.schemavalidate對于驗證失敗的結果拋出異常。

超強干貨來襲 云風專訪：近40年碼齡，通宵達旦的技術人生

總結

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