1.spring简介
spring中认为一切java类都是资源，而资源都是Bean,容纳这些Bean的是spring提供的Ioc容器，所以Spring是一种基于bean的编程。spring的作用主要是整合框架。
2.spring中的事务管理，首先事务的基本概念就是一处报错，全部回滚。这也是spring事务管理的基本作用。
3.spring事务管理分为xml 跟 注解
案例：
（1）实体类Employee.java
package com.gb.pojo;
import java.util.Date;
import java.util.List;
import org.springframework.stereotype.Component;
@Component("emp")
public class Employee {
private Integer id;
private String realName;
private SexEnum sex;
private Date birthday;
private String mobile;
private String email;
private String positon;
private String note;
private WorkCard workCard;
private List taskList;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getRealName() {
return realName;
}
public void setRealName(String realName) {
this.realName = realName;
}
public SexEnum getSex() {
return sex;
}
public void setSex(SexEnum sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getMobile() {
return mobile;
}
public void setMobile(String mobile) {
this.mobile = mobile;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPositon() {
return positon;
}
public void setPositon(String positon) {
this.positon = positon;
}
public String getNote() {
return note;
}
public void setNote(String note) {
this.note = note;
}
public WorkCard getWorkCard() {
return workCard;
}
public void setWorkCard(WorkCard workCard) {
this.workCard = workCard;
}
public List getTaskList() {
return taskList;
}
public void setTaskList(List taskList) {
this.taskList = taskList;
}
@Override
public String toString() {
return "Employee [id=" + id + ", realName=" + realName + ", sex=" + sex
+ ", birthday=" + birthday + ", mobile=" + mobile + ", email="
+ email + ", positon=" + positon + ", note=" + note
+ ", workCard=" + workCard + ", taskList=" + taskList + "]";
}
}
（2）mapper接口类：EmployeeMapper -----这里主要测试update方法
package com.gb.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import com.gb.pojo.EmpParames;
import com.gb.pojo.Employee;
public interface EmployeeMapper {
Employee findEmployeeById(Integer id);
/**
* 根据名字查询员工，名字可以传，也可以不传，当传时，名字需要作为条件
* 当不传时（empName为null或者空串），就不需要名字作为条件
* @param empName
* @return
*/
List findEmployeeByName(String empName);
// List findEmployeeByName(@Param("ename") String empName);
/**
* 根据姓名与电话查询员工
* 姓名可以传也可以不传
* 电话可以传也可以不传，如果传的话,要以所传的内容作为开头
* @param empPara
* @return
*/
List findEmployeeByBean(EmpParames empPara);
/**
* 根据id，name，tel进行查询
* 如果id不为0或者null，则根据id查询
* 如果id为0或为null且name不为null与空串，则根据name进行模糊查询
* 如果以上都不符合，那么就查询出电话不为空的员工
*
* @param id
* @param name
* @param tel
* @return
*/
List findEmployeeChoose(@Param("id") Integer id,@Param("name") String name);
/**
* 更新员工信息
* @param emp
* @return
*/
int updateEmployee(Employee emp);
/**
* 查询所有员工编号在集合idList中的员工信息
* @param idList
* @return
*/
List findEmployeeInList(List idList);
/**
* 判断出入的字符串是否是'X'，
* 如果是'X'的话，就查询姓名包含X的员工信息，
* 否则就查询所有员工信息
* @param str
* @return
*/
List findEmployeeByStringEqual(String str);}
（3)EmployeeMapper.xml配置文件： 自行甄别
update t_employee
real_name= #{realName},
sex=#{sex},
birthday=#{birthday},
mobile=#{mobile},
email=#{email},
positon=#{positon},
note=#{note}
where id=#{id}
（4） 向上写 Service层，EmployeeService.java
package com.gb.service;
import com.gb.pojo.Employee;
public interface EmployeeService {
Employee findEmployeeById(Integer id);
int updateEmployee(Employee emp);
}
service接口类实现类:EmployeeServiceImpl.java
package com.gb.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.gb.mapper.EmployeeMapper;
import com.gb.pojo.Employee;
@Component
public class EmployeeServiceImpl implements EmployeeService {
@Autowired
private EmployeeMapper employeeMapper;
public void setEmployeeMapper(EmployeeMapper employeeMapper) {
this.employeeMapper = employeeMapper;
}
@Transactional(readOnly=true,propagation=Propagation.REQUIRED, isolation=Isolation.READ_UNCOMMITTED)
@Override
public Employee findEmployeeById(Integer id) {
return employeeMapper.findEmployeeById(id);
}
@Transactional
@Override
public int updateEmployee(Employee emp) {
return employeeMapper.updateEmployee(emp);
}
}
（5）:Controller层， EmployeeController.java
package com.gb.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.gb.pojo.Employee;
import com.gb.service.EmployeeService;
@Component
public class EmployeeController {
@Autowired
private EmployeeService employeeService;
public void setEmployeeService(EmployeeService employeeService) {
this.employeeService = employeeService;
}
public Employee getEmployeeById(Integer id) {
return employeeService.findEmployeeById(id);
}
public int updateEmployee(Employee emp){
return employeeService.updateEmployee(emp);
}
}
（6）spring-context.xml配置文件
（7）mybatis-config.xml配置
（8）main方法
private static void updateEmployee(){
AbstractApplicationContext ac = new ClassPathXmlApplicationContext("spring-context.xml");
EmployeeController ec = ac.getBean(EmployeeController.class);
// Employee emp = ec.getEmployeeById(2);
Employee emp = (Employee) ac.getBean("emp");
// System.out.println(emp.getRealName());
emp.setId(1);
emp.setRealName("tuyiuouoih");
int count = ec.updateEmployee(emp);
System.out.println(count + "======================================");
ac.close();
}