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HomeDatabaseMysql TutorialOracle中使用存储过程解析xml字符串

Oracle数据库中存在两个数据表t_xml和t_parse,前者是将xml文档中主要节点以字符串的形式存放到para_name字段中,后者用于将para

背景:

Oracle数据库中存在两个数据表t_xml和t_parse,前者是将xml文档中主要节点以字符串的形式存放到para_name字段中,后者用于将para_name字段中xml字符串进行解析,将子节点提取出来进行存放。

例如:para_name中的xml字符串为name180%,则在t_parset数据表中将分别提取name1和80%进行存放。

t_xml的表结构为,t_parse的表结构为,存储的xml字符串结构为name180%

存储过程:

create or replace procedure p_parse (ID in varchar2)    is


--创建xml解析器实例xmlparser.Parser                         
xmlPar xmlparser.Parser :=xmlparser.newParser;

--定义DOM文档
xDoc xmldom.DOMDocument;

--定义item子节点数目变量

lenItme integer;

--定义节点列表,存放item节点们

itemNodes xmldom.DOMNodeList;

--定义节点列表,存放item子节点们
childNodes xmldom.DOMNodeList;

--定义节点,存放单个item节点

itemNode xmldom.DOMNode;

--定义属性变量,存放节点属性

itemArrMap xmldom.DOMNamedNodeMap;

--定义其他变量,存放子节点的值

name varchar(100);
value varchar(100);

--定义clob变量,存放xml字符串para_name
xmlStr clob;

begin
        for cur in (select t.para_name ,t.id  from t_xml t where t.id=ID ) 

        --从t_xml表中查询数据,id不是唯一标识,一个id可查出多条数据,故用loop循环
      loop

          --获取para_name中的xml字符串
          xmlStr:=cur.para_name;         
          xmlPar :=xmlparser.newParser;

          --解析xmlStr中xml字符串,并存放到xmlPar中
          xmlparser.parseClob(xmlPar, xmlStr);


          --将xmlPar中的数据转存到dom文档中
          xDoc:=xmlparser.getDocument(xmlPar);           

          xmlparser.freeParser(xmlPar);  --释放解析器实例

          --获取所有item节点     
          itemNodes:=xmldom.getElementsByTagName(xDoc,'item');

          --获取item节点的个数
          lenItme :=xmldom.getLength(itemNodes);

          --遍历所有的item节点

          for i in 0..lenItme-1
          loop
              begin

                  --获取节点列表中的第i个item节点
                  itemNode:=xmldom.item(itemNodes,i);

                  --获取第i个item节点的所有子节点
                  childNodes:=xmldom.getChildNodes(itemNode);

                  --获取所有子节点的值
                  name:=xmldom.getNodeValue(xmldom.getFirstChild(xmldom.item(childNodes,0)));                 
                  value:=xmldom.getNodeValue(xmldom.getFirstChild(xmldom.item(childNodes,1)));

                  --将子节点的值name1和80%存放到t_parse表中

                  insert into t_parse values(ID,name,value);
                  commit;
                end;
            end loop;
      end loop;

      --是否dom文档

      xmldom.freeDocument(xDoc);

      --异常和错误处理
      EXCEPTION
      WHEN OTHERS THEN
      DBMS_output.PUT_LINE(SQLERRM);

end p_parse;

存储过程创建完毕之后,就可以进行测试了,,右击存储过程名称,在快捷菜单中点击test进行测试,测试时需要手动输入id值,然后一步一步进行测试即可。

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