我在得到適當的結果criteria.uniqueResult()後引發了異常Quote。用途查詢 - 從表中獲取隨機結果從DB甲骨文援引「無法在Hibernate Criteria中提取ResultSet
org.hibernate.exception.SQLGrammarException:在org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java不能提取的ResultSet : 80) 在org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) 在org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126) 在org.hibernate作爲。 engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112) at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:91) at org.hibernate.loader.Loader.loader.getResultSet(Loader.java:2065) at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1862) at org.hibernate.loader.Loader.executeQueryStatement(Loader。 java:1838) at org.hibernate.loader.Loader.doQuery(Loader.java:909) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354) at org.hibernate.loader.Loader。 doList(Loader.java:2553) at org.hibernate.loader.Loader.doList(Loader.java:2539) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2369) at org.hibernate。 loader.Loader.list(Loader.java:2364) at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:126) a t org.hibernate.internal.SessionImpl.list(SessionImpl.java:1682) at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:380) at org.hibernate.internal.CriteriaImpl.uniqueResult(CriteriaImpl.java :402) 在ua.com.goit.gojava7.kikstarter.dao.database.QuoteDaoDbImpl.getRandomQuote(QuoteDaoDbImpl.java:42) 在sun.reflect.NativeMethodAccessorImpl.invoke0(本機方法) 在sun.reflect.NativeMethodAccessorImpl。在org.springframework.aop的java.lang.reflect.Method.invoke(Method.java:601) 處調用(NativeMethodAccessorImpl.java:57) (在DelegatingMethodAccessorImpl.java:43) 。 support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302) at org.springfra mework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) 在org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 在org.springframework.transaction.interceptor.TransactionInterceptor $ 1.proceedWithInvocation (TransactionInterceptor.java:99) 在org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) 在org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 在有機.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)$ Proxy48.getRandomQuote(Unknown Source) at ua.com.goit.gojava7.kikstarter.controller.servlet.SelectoinCategories.doGet(SelectoinCategories.java:43) at javax.servlet.http。 HttpServlet.service(HttpServlet.java:621) 在javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 在org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve。的java:222) 在org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 在org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 在org.apache。 catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve。的java:953) 在org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 在org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 在org.apache。 coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyot e.AbstractProtocol $ AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run(JIoEndpoint.java:312) at java.util.concurrent.ThreadPoolExecutor.runWorker( ThreadPoolExecutor.java:1145) 在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run(ThreadPoolExecutor.java:615) 在java.lang.Thread.run(Thread.java:722)
類QuoteDaoDbImpl
@Repository
public class QuoteDaoDbImpl implements QuoteDao {
private static final String SELECT_RANDOM_QUOTE = "SELECT * FROM (SELECT * FROM quotes ORDER BY DBMS_RANDOM.VALUE) WHERE rownum = 1";
@Autowired
private SessionFactory sessionFactory;
@Transactional
@Override
public Quote getRandomQuote() {
Session session = sessionFactory.getCurrentSession();
Criteria criteria = session.createCriteria(Quote.class);
criteria.add(Restrictions.sqlRestriction(SELECT_RANDOM_QUOTE));
criteria.setMaxResults(1);
Quote quote = (Quote) criteria.uniqueResult();
session.close();
return quote;
}
}
類SelectoinCategories
@WebServlet("/categories")
public class SelectoinCategories extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Autowired
private QuoteDao quoteDao;
@Autowired
private CategoryDao categoryDao;
public void init() throws ServletException {
SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this, getServletContext());
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Quote quote = quoteDao.getRandomQuote();
List<Category> categories = categoryDao.getAll();
request.setAttribute("content", quote.getContent());
request.setAttribute("author", quote.getAuthor());
request.setAttribute("categories", categories);
request.getRequestDispatcher("WEB-INF/jsp/categories.jsp").forward(request, response);
}
}
類報價
@Entity
@Table(name = "qoutes")
public class Quote {
@Id
@SequenceGenerator(name = "SEQ_GEN", sequenceName = "seq_id", allocationSize = 10)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEQ_GEN")
private int id;
@Column(name = "content")
private String content;
@Column(name = "author")
private String author;
public Quote() {
}
public Quote(String content, String author) {
this.content = content;
this.author = author;
}
public int getId() {
return id;
}
public String getContent() {
return content;
}
public String getAuthor() {
return author;
}
public void setId(int id) {
this.id = id;
}
public void setContent(String quoteContent) {
this.content = quoteContent;
}
public void setAuthor(String quoteAuthor) {
this.author = quoteAuthor;
}
public String toString() {
return "ID: " + id + "; Content: " + content + "; Author: " + author;
}
}
錶行情
CREATE TABLE quotes
(
id INTEGER NOT NULL,
content VARCHAR2(500) NOT NULL,
author VARCHAR2(100) NOT NULL
);
其SQL語法異常 - 在查詢瀏覽器中運行SQL查詢,確保它能正常工作。 –
@Subhrajyoti在SQL Plus查詢返回正確的結果Majumder,我檢查。 – Vladimir
[Hibernate Criteria API:得到n個隨機行]可能重複(http://stackoverflow.com/questions/2810693/hibernate-criteria-api-get-n-random-rows) – FGreg