我绝对是hibernate的新手，这实际上让我烦恼。即使查询正确，它也可以找到该表。这个问题可以解决什么问题？
这是我的dao中错误仍然存在的部分------------------------------------ --------------------------------
@Override
public void emptyCart() {
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = session.beginTransaction();
String sqlQuery = "DELETE from ShoppingCart";
Query query = session.createQuery(sqlQuery);
query.executeUpdate();
transaction.commit();
session.close();
}
下面是stacktrace ------------------------------------------- -------------------------------------------------- ----------
SEVERE: Servlet.service() for servlet [appServlet] in context with path [/NutsAboutCandyWebProject] threw exception [Request processing failed; nested exception is org.hibernate.exception.SQLGrammarException: could not execute statement] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'db_nutsaboutcandy.shopping_cart_shopping_cart' doesn't exist
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2825)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2441)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2366)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2350)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:187)
at org.hibernate.hql.internal.ast.exec.BasicExecutor.doExecute(BasicExecutor.java:109)
at org.hibernate.hql.internal.ast.exec.DeleteExecutor.execute(DeleteExecutor.java:121)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.executeUpdate(QueryTranslatorImpl.java:445)
at org.hibernate.engine.query.spi.HQLQueryPlan.performExecuteUpdate(HQLQueryPlan.java:374)
at org.hibernate.internal.SessionImpl.executeUpdate(SessionImpl.java:1286)
at org.hibernate.internal.QueryImpl.executeUpdate(QueryImpl.java:118)
at com.nutsaboutcandywebproject.dao.SQLShoppingCartDataAccess.emptyCart(SQLShoppingCartDataAccess.java:61)
at com.nutsaboutcandywebproject.service.ServiceFacadeImpl.emptyCart(ServiceFacadeImpl.java:221)
at com.nutsaboutcandywebproject.controller.OrderController.orderSuccessful(OrderController.java:209)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
ShoppingCart实体
package com.nutsaboutcandywebproject.model;
import java.io.Serializable;
import java.util.List;
import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "shopping_cart", catalog = "db_nutsaboutcandy")
public class ShoppingCart implements Serializable {
private static final long serialVersionUID = 1L;
private Integer cartId;
private Integer userId;
private Integer productId;
private Integer sizeId;
private Integer numberOfItems;
private List<ShoppingCart> cart;
@ElementCollection
public List<ShoppingCart> getCart() {
return cart;
}
public void setCart(List<ShoppingCart> cart) {
this.cart = cart;
}
public ShoppingCart(){
super();
}
public ShoppingCart(Integer cartId, Integer userId, Integer productId,
Integer sizeId, Integer numberOfItems) {
super();
this.cartId = cartId;
this.userId = userId;
this.productId = productId;
this.sizeId = sizeId;
this.numberOfItems = numberOfItems;
}
@Id
@GeneratedValue
@Column(name="cart_id", nullable = false)
public Integer getCartId() {
return cartId;
}
public void setCartId(Integer cardId) {
this.cartId = cardId;
}
@Column(name="user_id", nullable = false)
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
@Column(name="product_id", nullable = false)
public Integer getProductId() {
return productId;
}
public void setProductId(Integer productId) {
this.productId = productId;
}
@Column(name="size_id", nullable = false)
public Integer getSizeId() {
return sizeId;
}
public void setSizeId(Integer sizeId) {
this.sizeId = sizeId;
}
@Column(name = "number_of_items", nullable = false)
public Integer getNumberOfItems() {
return numberOfItems;
}
public void setNumberOfItems(Integer numberOfItems) {
this.numberOfItems = numberOfItems;
}
}
答案 0 :(得分：2)
你有什么是HQL查询，而不是SQL查询。所以ShoppingCart是实体名称，而不是表名。 HQL从不使用表名和列名。它总是使用实体名称及其字段名称。
您告诉Hibernate每个购物车都包含购物车列表。这不是现实。
要获取所有购物车的列表，请执行HQL查询：
select c from ShoppingCart c
并且Hibernate将查询数据库并返回购物车列表。
答案 1 :(得分：0)
即使我遇到同样的问题。 我在配置文件中设置了“hibernate.hbm2ddl.auto = update”。
hibernate.hbm2ddl.auto创建SessionFactory时，自动验证或将架构DDL导出到数据库。使用create-drop，当SessionFactory显式关闭时，将删除数据库模式。
e.g。验证|更新|创建|创建降
所以可能的选项列表是，
验证：验证架构，不对数据库进行任何更改。 更新：更新架构。 create：创建架构，销毁以前的数据。 create-drop：在会话结束时删除模式。