org.springframework.web.util.NestedServletException：请求处理失败;嵌套异常是java.lang.IllegalArgumentException：org.hibernate.hql.internal.ast.QuerySyntaxException：客户未映射[来自Customer]
虽然一切都很好，为什么它显示这个错误
Bean类：
package com.luv2code.springdemo.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
//@Table(schema = "web_customer_tracker", name = "customer")
@Table(name="customer")
@Entity
public class Customer {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="id")
private int id;
@Column(name="first_name")
private String firstName;
@Column(name="last_name")
private String lastName;
@Column(name="email")
private String email;
public Customer() {
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "Customer [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
}
}
DAO Impl类：
package com.luv2code.springdemo.dao;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import com.luv2code.springdemo.entity.Customer;
@Repository
public class CustomerDAOImpl implements CustomerDAO {
@Autowired
private SessionFactory sessionFactory;
@Override
@Transactional
public List<Customer> getCustomers() {
//get the current hibernate session
Session currentSession = sessionFactory.getCurrentSession();
//List customers = new ArrayList<Customer>();
//create a query
Query<Customer> theQuery=currentSession.createQuery("from customer", Customer.class);
//currentSession.createQuery("from Customer", Customer.class);
//execute query and get result list
List<Customer> customers=theQuery.getResultList();
// return the results
/* Customer cus1=new Customer();
cus1.setEmail("[email protected]");
cus1.setFirstName("Abhishek");
cus1.setId(10);
cus1.setLastName("Kumar");
customers.add(cus1); */
return customers;
}
}
XML：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- Add support for component scanning -->
<context:component-scan base-package="com.luv2code.springdemo" />
<!-- Add support for conversion, formatting and validation support -->
<mvc:annotation-driven/>
<!-- Define Spring MVC view resolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- Step 1: Define Database DataSource / connection pool -->
<bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="com.mysql.cj.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/web_customer_tracker?useSSL=false&serverTimezone=UTC" />
<property name="user" value="springstudent" />
<property name="password" value="springstudent" />
<!-- these are connection pool properties for C3P0 -->
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="20" />
<property name="maxIdleTime" value="30000" />
</bean>
<!-- Step 2: Setup Hibernate session factory -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="packagesToScan" value="com.luv2code.springdemo.entity" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<!-- Step 3: Setup Hibernate transaction manager -->
<bean id="myTransactionManager"
class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- Step 4: Enable configuration of transactional behavior based on annotations -->
<tx:annotation-driven transaction-manager="myTransactionManager" />
</beans>
这是因为您在客户实体中提供实体名称，因此，您的查询中应使用相同的名称（现在您的查询中不能引用该类的名称）。尝试使用提到的相同实体名称调用查询（同时处理案例）。
尝试如下：
Query<Customer> theQuery=
currentSession.createQuery("from customer", Customer.class);
在这里，我在您的查询中匹配@Entity(name="customer")中提到的实体名称。
我没有通过你所有的代码，但在sessionFactory的xml豆，
尝试将<property name="packagesToScan" value="com.luv2code.springdemo.entity" />更改为<property name="packagesToScan" value="code.luv2code.springdemo.entity" />。
你实际的Customer实体生活在包code.luv2code.springdemo.entity，虽然你使用com.luv2code.springdemo.entity。所以它是扫描错误的包。这可能是问题所在。