小编use*_*576的帖子

Mongo DB中保存和插入有什么区别？两者看起来都一样

db.users.save({username:"google",password:"google123"})

db.users.insert({username:"google",password:"google123"})

我需要在JSON中构建一个简单的JSON数组,但在循环中它会在每次迭代期间覆盖第一个值.

def jsonBuilder = new groovy.json.JsonBuilder()
contact.each {
            jsonBuilder.contact(
                    FirstName:  it.getFirstName(),
                    LastName:  it.getLastName(),
                    Title: it.getTitle(),       
            )
    }

它只返回简单的JSON并覆盖每次迭代的值并保留最后一次.在groovy中构造JSON数组的语法是什么？

WrappedConnectionJDK6 wrapped = (WrappedConnectionJDK6) dbStrategy.getConnection();
            Connection underlyingConn = wrapped.getUnderlyingConnection();
            OracleConnection oracleConn = (OracleConnection)underlyingConn;

最后一行给出错误 -

> ERROR
> [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/web].[resteasy-servlet]]
> (http-/0.0.0.0:8080-1) Servlet.service() for servlet resteasy-servlet
> threw exception: org.jboss.resteasy.spi.UnhandledException:
> java.lang.ClassCastException: oracle.jdbc.driver.T4CConnection cannot
> be cast to oracle.jdbc.OracleConnection

@POST
@Path("/getmethod")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_XML)
Response getMethod(SomeVO someVO);

在我的* .ear中,我可以看到resteasy-jaxb-provider-2.2.0.GA.jar和resteasy-jaxrs-2.2.1.GA.jar都存在,但在尝试访问此方法时,我遇到此错误:

[org.jboss.resteasy.core.SynchronousDispatcher](http-/0.0.0.0:8080-1)执行POST /失败/ getmethod:org.jboss.resteasy.core.NoMessageBodyWriterFoundFailure:找不到类型的响应对象的MessageBodyWriter: *媒体类型的VO:org.jboss.resteasy.core.ServerResponse.writeTo上的application/xml(ServerResponse.java:216)[resteasy-jaxrs-2.3.3.Final-redhat-1.jar:2.3.3.Final -redhat-1]在

org.jboss.resteasy.core.SynchronousDispatcher.writeJaxrsResponse(SynchronousDispatcher.java:585)

[resteasy-jaxrs-2.3.3.Final-redhat-1.jar:2.3.3.Final-redhat-1]在org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:506)[resteasy-jaxrs -2.3.3.Final-redhat-1.jar:2.3.3.Final-redhat-1]在org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119)[resteasy-jaxrs-2.3.3 .Final-redhat-1.jar:2.3.3.Final-redhat-1]在org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)[resteasy-jaxrs-2.3.3 .Final-redhat-1.jar:2.3.3.Final-redhat-1]在org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)[resteasy-jaxrs-2.3.3 .Final-redhat-1.jar:2.3.3.Final-redhat-1]在org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)[resteasy-jaxrs-2.3.3 .Final-redhat-1.jar:2.3.3.Final-redhat-1]在javax.servlet.http.HttpServlet.service(HttpServlet.java:847)[jboss-servlet-api_3.0_spec-1.0.1.Final -redhat-1.jar:1.0.1.Final-redhat-1]在org.apache的org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)[jbossweb-7.0.16.Final-redhat-1.jar:]. catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)[jbossweb-7.0.16.Final-redhat-1.jar:] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)[ jbossweb-7.0.16.Final-redhat-1.jar:] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)[jbossweb-7.0.16.Final-redhat-1.jar:]在org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)[jboss-as-web-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]在org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)[jbossweb-7.0.16.Final-redhat-1.jar:] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve. java:102)[jbossweb-7.0.16.Final-redhat-1.jar:] at org.apache.catalina.core.StandardEngineValve.i nvoke(StandardEngineValve.java:109)[jbossweb-7.0.16.Final-redhat-1.jar:] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)[jbossweb-7.0.16.最终-redhat-1.jar:] org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)[jbossweb-7.0.16.Final-redhat-1.jar:] org.apache.coyote .http11.Http11Protocol $ Http11ConnectionHandler.process(Http11Protocol.java:679)[jbossweb-7.0.16.Final-redhat-1.jar:] at org.apache.tomcat.util.net.JIoEndpoint $ Worker.run(JIoEndpoint. java:931)[jbossweb-7.0.16.Final-redhat-1.jar:] java.lang.Thread.run(Unknown Source)[rt.jar:1.7.0_09]

需要有关groovy中嵌套循环语法的指导.如何使用iterator打印(a.name的值,b.name的值)的值？

List a
a.each {
    print(it.name)
    List b = something
    b.each {
        print(value of a.name, value of b.name)
    }
}

我能够获取以下值:

SELECT * FROM table WHERE ATTENDANCE_DATE < SYSDATE;

但没有记录

SELECT * FROM table WHERE ATTENDANCE_DATE between SYSDATE and SYSDATE -20;

这有什么不对？

Select status from table where 'condition' order by status desc

收益:

T
R
P
O
N
C

是否可以始终在顶部显示"P",以正常的降序显示其余部分？

查询的场景是

select * from table1 where colName = 'John' and age(select age from
 table1) <> 21

需要所有行名称为John的数据,但其年龄不应为21.

如何加入同一张桌子？