Question

我试图计算在oracle BBDD上返回函数的行数。我在其他一些问题中看到过（例如：rs.last() gives Invalid operation for forward only resultset : last），需要将 ResultSet.TYPE_SCROLL_INSENSITIVE，ResultSet.CONCUR_READ_ONLY 添加到 callablestatement 。

我已经尝试了 ResultSet.TYPE_SCROLL_INSENSITIVE ，还有 ResultSet.TYPE_SCROLL_SENSITIVE ...没有结果。我仍然得到相同的无效操作异常。

我失踪了什么？

继承我的代码：

String call = "{ ? = call MyProcedure (?) }"; 
CallableStatement cstmt= conn.prepareCall(call, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
cstmt.setString(2,"param 1");
cstmt.registerOutParameter(1, OracleTypes.CURSOR);

cstmt.execute();
ResultSet rset = (ResultSet)cstmt.getObject(1);
rset.last(); //Exception comes here
int rowsnumber = rset.getRow();

感谢。

编辑：

正如评论中所述，我首先添加了我正在调用的Oracle函数：

create or replace FUNCTION MyProcedure
( IdC IN VARCHAR2
)
RETURN sys_refcursor
IS
  c_result sys_refcursor;
BEGIN
  OPEN c_result FOR SELECT name, properties FROM city WHERE name = IdC;
  RETURN c_result;
END;

Stack Stack：

Stack: java.sql.SQLException: Operación no válida para el juego de resultados de sólo reenvío : last
    at oracle.jdbc.driver.InsensitiveScrollableResultSet.last(InsensitiveScrollableResultSet.java:646)
    at MyPackage.CoreWS.ExProcedure(CoreWS.java:58)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at weblogic.wsee.jaxws.WLSInstanceResolver$WLSInvoker.invoke(WLSInstanceResolver.java:120)
    at weblogic.wsee.jaxws.WLSInstanceResolver$WLSInvoker.invoke(WLSInstanceResolver.java:93)
    at com.sun.xml.ws.server.InvokerTube$2.invoke(InvokerTube.java:149)
    at com.sun.xml.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:88)
    at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:1136)
    at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:1050)
    at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:1019)
    at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:877)
    at com.sun.xml.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:419)
    at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:868)
    at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:422)
    at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:169)
    at weblogic.wsee.jaxws.WLSServletAdapter.handle(WLSServletAdapter.java:229)
    at weblogic.wsee.jaxws.HttpServletAdapter$AuthorizedInvoke.run(HttpServletAdapter.java:667)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:368)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:163)
    at weblogic.wsee.util.ServerSecurityHelper.authenticatedInvoke(ServerSecurityHelper.java:108)
    at weblogic.wsee.jaxws.HttpServletAdapter$3.run(HttpServletAdapter.java:286)
    at weblogic.wsee.jaxws.HttpServletAdapter.post(HttpServletAdapter.java:295)
    at weblogic.wsee.jaxws.JAXWSServlet.doRequest(JAXWSServlet.java:128)
    at weblogic.servlet.http.AbstractAsyncServlet.service(AbstractAsyncServlet.java:103)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:286)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:260)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:137)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:350)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:247)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3679)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3649)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:326)
    at weblogic.security.service.SecurityManager.runAsForUserCode(SecurityManager.java:197)
    at weblogic.servlet.provider.WlsSecurityProvider.runAsForUserCode(WlsSecurityProvider.java:203)
    at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:71)
    at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2433)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2281)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2259)
    at weblogic.servlet.internal.ServletRequestImpl.runInternal(ServletRequestImpl.java:1686)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1646)
    at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:270)
    at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:348)
    at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:333)
    at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:54)
    at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41)
    at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:640)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:406)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:346)

Answer 1

仅向前移动光标的能力是ResultSet的默认行为，并且是仅实现 JDBC 1.0 API 的驱动程序可能的唯一光标移动。这种结果集的类型为ResultSet.TYPE_FORWARD_ONLY，并且被称为仅向前结果集。

如果驱动程序在 JDBC 2.0核心API 中实现了游标移动方法，则其结果集可以滚动。可滚动结果集的光标可以向前和向后移动以及移动到特定行。以下方法将光标向后移动到第一行，最后一行，移动到特定行号，移动到当前行的指定行数，依此类推：previous，first，last，absolute，relative，afterLast ，以及之前。

您能否确认您的API版本？

参考：Result set

同样正如Mark Rotteveel在评论中所建议的那样，为什么不将光标作为一个外参参数并明确地获取它而不是在函数中使用RETURN并验证它是否正常工作？

resultset.last（）在java

1 个答案: