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我是在spring和hibernate中新建的，所有的東西都正常工作，但是我在每次調用getCurrentSession時都檢查了一個新的連接線程已經在mysql中進入休眠狀態。據我所知這不是一個好的數據庫實踐。爲什麼getCurrentSession每次都創建新的連接線程。 我的代碼 -getCurrentSession在每次調用時都創建新的連接
應用程序的context.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:aop="http://www.springframework.org/schema/aop"
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-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<tx:annotation-driven />
<context:component-scan base-package="com.vc.teacher" />
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"
lazy-init="false">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.vc.teacher.entities.User</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>
<!-- <prop key="hibernate.current_session_context_class">thread</prop> -->
<prop key="show_sql">true</prop>
</props>
</property>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/teacher"></property>
<property name="username" value="root"></property>
<property name="password" value="root"></property>
</bean>
<bean id="userDao" class="com.vc.teacher.db.dao.UserDao">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
</beans>
userDAO的類
package com.vc.teacher.db.dao;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import com.vc.teacher.entities.User;
public class UserDao {
@Autowired
SessionFactory sessionFactory;
public SessionFactory getSessionFactory() {
return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
@Transactional
public User checkCreditionals(String email, String password){
User user = null;
Session session = sessionFactory.getCurrentSession();
Query query = session.createQuery("from User where email = '"+email+"' and password = '"+password+"'");
List list = query.list();
if(list.size()>0)
user = (User)list.get(0);
return user;
}
@Transactional
public boolean registerUser(User user){
boolean result = false;
Session session = sessionFactory.getCurrentSession();
try{
user.setUserTypeId(2);
session.save(user);
result = true;
} catch (Exception e){
result = false;
e.printStackTrace();
}
return result;
}
}
實體類 - 用戶
package com.vc.teacher.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="user")
public class User {
@Id
@GeneratedValue
@Column(name="user_id")
private int id;
@Column(name="age")
private int age;
@Column(name="user_type_id")
private int userTypeId;
@Column(name="first_name")
private String firstName;
@Column(name="last_name")
private String lastName;
@Column(name="profession")
private String profession;
@Column(name="phone")
private String phone;
@Column(name="email")
private String email;
@Column(name="password")
private String password;
@Column(name="address")
private String address;
@Column(name="status")
private String status;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getUserTypeId() {
return userTypeId;
}
public void setUserTypeId(int userTypeId) {
this.userTypeId = userTypeId;
}
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 getProfession() {
return profession;
}
public void setProfession(String profession) {
this.profession = profession;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
}
Controller類 - 的AccountController
package com.vc.teacher.controller;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import com.vc.teacher.db.dao.UserDao;
import com.vc.teacher.entities.User;
@Controller
public class AccountController {
@RequestMapping("/login")
public String loginUser(@RequestParam("email") String email,
@RequestParam("password") String password, Model model) {
ApplicationContext context = new ClassPathXmlApplicationContext(
"applicationContext.xml");
User user = ((UserDao) context.getBean("userDao")).checkCreditionals(
email, password);
if (user != null) {
model.addAttribute("user", user);
return "jsp/profile";
} else {
model.addAttribute("error", "Wrong creditionals");
return "jsp/signin";
}
}
@RequestMapping("/signUp")
public String initilize(Model model) {
model.addAttribute(new User());
return "jsp/signup";
}
@RequestMapping(method = RequestMethod.POST, value = "/register")
public String signUpUser(User user, RedirectAttributes attributes) {
boolean result = false;
ApplicationContext context = new ClassPathXmlApplicationContext(
"applicationContext.xml");
user.setStatus("Deactive");
result = ((UserDao) context.getBean("userDao")).registerUser(user);
if (result == true) {
attributes.addFlashAttribute("message", "You are ready to go now !");
return "redirect:/signUp";
} else {
attributes.addFlashAttribute("message", "Something went wrong");
return "redirect:/signUp";
}
}
}
MySQL連接狀態快照是 -
我這樣做了，但在編譯時它給出了這個錯誤 - 沒有發現依賴性的[com.vc.teacher.db.dao.UserDao]類型的合格bean：預計至少有1個bean有資格作爲這個autowire候選者依賴。依賴註釋：{@ org.springframework.beans.factory.annotation.Autowired（required = true）} –
確保您的UserDao類使用@Component進行註釋..因爲我們是隱式定義bean的。 –
我已在UserDao類 –