oracle xmltype 不支持的 Oracle 数据类型 USERDEFINED

1SELECT DOC_ID, EXTRACTValue(XML_DATA, '/Experiment/Parameters/Parameter[@col="H" and @row="试验1"]')

2 FROM EXPERIMENTS

3 WHERE EXISTSNODE(XML_DATA, '/Experiment/Parameters/Parameter[@col="H" and @row="试验1"]') = 1
如上面的 sql 语句 查询xmltype类型字段时在pl/slq里面执行显示很好

但是到c#程序中 ExecuteDataSet时 就或出现

不支持的 Oracle 数据类型 USERDEFINED

原来缺少getclobval()

1SELECT DOC_ID, EXTRACT(XML_DATA, '/Experiment/Parameters/Parameter[@col="H" and @row="试验1"]').getclobval()

2 FROM EXPERIMENTS

3 WHERE EXISTSNODE(XML_DATA, '/Experiment/Parameters/Parameter[@col="H" and @row="试验1"]') = 1
上面的写法在c#程序中执行才能通过