MyBatis3.1.1+Spring3.1.1的增、删、查、改以及分页和事务管理
本文主要演示基于Mybatis3.1.1+Spring3.1.1的整合以及基于Mybatis3.1.1+MySQL5.5的增、删、改、查【分页】的配置和使用。以下：
实体类：以一个用户实体为例——————
package com.pb.mybatis.entity;
public class User {
Integer age; //年龄
Integer gender; //性别
Integer id;
String mail; //邮箱
String nickname;
String password;
String site; //个人站点
String username;
public User() {
super();
// TODO Auto-generated constructor stub
}
public User(Integer id) {
super();
this.id = id;
}
public User(String username, String password) {
super();
this.username = username;
this.password = password;
}
public User(String password, String username, String nickname,
Integer gender, Integer age, String mail, String site) {
super();
this.password = password;
this.username = username;
this.nickname = nickname;
this.gender = gender;
this.age = age;
this.mail = mail;
this.site = site;
}
public User(Integer id,Integer age, Integer gender, String mail,
String nickname, String password, String site, String username) {
super();
this.age = age;
this.gender = gender;
this.id = id;
this.mail = mail;
this.nickname = nickname;
this.password = password;
this.site = site;
this.username = username;
}
public Integer getAge() {
return age;
}
public Integer getGender() {
return gender;
}
public Integer getId() {
return id;
}
public String getMail() {
return mail;
}
public String getNickname() {
return nickname;
}
public String getPassword() {
return password;
}
public String getSite() {
return site;
}
public String getUsername() {
return username;
}
public void setAge(Integer age) {
this.age = age;
}
public void setGender(Integer gender) {
this.gender = gender;
}
public void setId(Integer id) {
this.id = id;
}
public void setMail(String mail) {
this.mail = mail;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
public void setPassword(String password) {
this.password = password;
}
public void setSite(String site) {
this.site = site;
}
public void setUsername(String username) {
this.username = username;
}
}
实体类的UserDao
package com.pb.mybatis.dao;
import java.util.List;
import com.pb.mybatis.entity.User;
import com.pb.mybatis.util.UserPage;
/**
* 定义实体内操作接口Dao
* @author Voishion
* @version 2012.12.30
*/
public interface UserDao {
/**
* 保存
* @param user
*/
void save(User user);
/**
* 查询所有
* @return
*/
List<User> findAll();
/**
* 按ID查询
* @param id
* @return
*/
User findById(Integer id);
/**
* 删除
* @param user
*/
void delete(Integer id);
/**
* 更新
* @param map
*/
void update(User user);
/**
* 分页查询
* @param page
* @return
*/
List<User> findByPage(UserPage page);
/**
* 分页查询时得到符合条件的数据
* @param page
* @return
*/
Integer getCount(UserPage page);
}
实体类UserDao的实现UserDaoImpl-----
package com.pb.mybatis.dao.impl;
import java.util.List;
import com.pb.mybatis.dao.UserDao;
import com.pb.mybatis.entity.User;
import com.pb.mybatis.mapper.UserMapper;
import com.pb.mybatis.util.UserPage;
public class UserDaoImpl implements UserDao{
//在此处注入一个UserMapper
private UserMapper userMapper;
public void setUserMapper(UserMapper userMapper) {
this.userMapper = userMapper;
}
@Override
public void delete(Integer id) {
userMapper.delete(id);
}
@Override
public List<User> findAll() {
return userMapper.findAll();
}
@Override
public User findById(Integer id) {
return userMapper.findById(id);
}
@Override
public void save(User user) {
userMapper.save(user);
// throw new RuntimeException("Error");
}
@Override
public void update(User user) {
userMapper.update(user);
}
@Override
public List<User> findByPage(UserPage page) {
return userMapper.findByPage(page);
}
@Override
public Integer getCount(UserPage page) {
return userMapper.getCount(page);
}
}
我想大家现在都在关心UserDaoImpl中的UserMapper是从哪里来的：
首先我们需要一个分页查询的中间类UserPage：
package com.pb.mybatis.util;
import com.pb.mybatis.entity.User;
/**
* User 分页查询公共条件类
* @author Voishion
*/
public class UserPage {
Integer firstRec;
Integer pageSize;
User user;
public Integer getFirstRec() {
return firstRec;
}
public void setFirstRec(Integer firstRec) {
this.firstRec = firstRec;
}
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
其次就是UserMapper映射了~~~~~~~~
package com.pb.mybatis.mapper;
import java.util.List;
import com.pb.mybatis.entity.User;
import com.pb.mybatis.util.UserPage;
/**
* 定义实体内操作接口
* @author Voishion
* @version 2012.12.30
*/
public interface UserMapper {
/**
* 保存
* @param user
*/
void save(User user);
/**
* 查询所有
* @return
*/
List<User> findAll();
/**
* 按ID查询
* @param id
* @return
*/
User findById(Integer id);
/**
* 删除
* @param user
*/
void delete(Integer id);
/**
* 更新
* @param map
*/
void update(User user);
/**
* 分页查询
* @param page
* @return
*/
List<User> findByPage(UserPage page);
/**
* 分页查询时得到符合条件的数据
* @param page
* @return
*/
Integer getCount(UserPage page);
}
注意UserMapper要与在同一个包下的UserMapper.xml同名，且在同一包下：以下就是UserMapper的映射文件UserMapper.xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- Mapper文件最好放在与Dao接口同一目次下 -->
<mapper namespace="com.pb.mybatis.mapper.UserMapper">
<!-- 定义数据库字段与实体对象的映射关系 -->
<resultMap type="com.pb.mybatis.entity.User" id="resultUser">
<id property="id" column="ID"/>
<result property="age" column="AGE"/>
<result property="gender" column="GENDER"/>
<result property="mail" column="MAIL"/>
<result property="nickname" column="NICKNAME"/>
<result property="password" column="PASSWORD"/>
<result property="site" column="SITE"/>
<result property="username" column="USERNAME"/>
</resultMap>
<parameterMap type="com.pb.mybatis.entity.User" id="paramUser">
<parameter property="id"/>
<parameter property="age"/>
<parameter property="gender"/>
<parameter property="mail"/>
<parameter property="nickname"/>
<parameter property="password"/>
<parameter property="site"/>
<parameter property="username"/>
</parameterMap>
<!-- 定义要操纵的SQL语句 -->
<insert id="save" parameterType="com.pb.mybatis.entity.User">
INSERT INTO user(id,age,gender,username,password,mail,nickname,site)
VALUES(#{id},#{age},#{gender},#{username},#{password},#{mail},#{nickname},#{site})
</insert>
<select id="findAll" resultMap="resultUser">
SELECT * FROM user
</select>
<select id="findById" parameterType="Integer" resultMap="resultUser">
SELECT * FROM user
WHERE id=#{value}
</select>
<delete id="delete" parameterType="Integer">
DELETE FROM user
WHERE id=#{value}
</delete>
<update id="update" parameterType="com.pb.mybatis.entity.User" >
UPDATE user
<set>
<if test="age != null">age=#{age},</if>
<if test="gender != null">gender=#{gender},</if>
<if test="username != null">username=#{username},</if>
<if test="password != null">password=#{password},</if>
<if test="mail != null">mail=#{mail},</if>
<if test="nickname != null">nickname=#{nickname},</if>
<if test="site != null">site=#{site},</if>
</set>
WHERE id=#{id}
</update>
<select id="findByPage" parameterType="com.pb.mybatis.util.UserPage" resultMap="resultUser">
SELECT * FROM user
WHERE 1=1
<if test="user != null">
<if test="user.nickname != null">and nickname like #{user.nickname}</if>
<if test="user.username != null">and username like #{user.username}</if>
</if>
LIMIT #{firstRec},#{pageSize}
</select>
<select id="getCount" parameterType="com.pb.mybatis.util.UserPage" resultType="Integer">
SELECT count(*) FROM user
WHERE 1=1
<if test="user != null">
<if test="user.nickname != null">and nickname like #{user.nickname}</if>
<if test="user.username != null">and username like #{user.username}</if>
</if>
</select>
</mapper>
现在是UserService业务层：
package com.pb.mybatis.service;
import java.util.List;
import com.pb.mybatis.entity.User;
import com.pb.mybatis.util.UserPage;
/**
* Service层User操作接口
* @author Voishion
* @version 2012.12.30
*/
public interface UserService {
void saveUser(User user);
void updateUser(User user);
void deleteUser(Integer id);
User findById(Integer id);
List<User> findAll();
List<User> findByPage(UserPage page);
Integer getCount(UserPage page);
}
UserServiceImpl实现：
package com.pb.mybatis.service.impl;
import java.util.List;
import com.pb.mybatis.dao.UserDao;
import com.pb.mybatis.entity.User;
import com.pb.mybatis.service.UserService;
import com.pb.mybatis.util.UserPage;
/**
* Service层User操作接口实现
* @author Voishion
* @version 2012.12.30
*/
public class UserServiceImpl implements UserService{
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
@Override
public void saveUser(User user) {
userDao.save(user);
}
@Override
public void deleteUser(Integer id) {
userDao.delete(id);
}
@Override
public void updateUser(User user) {
userDao.update(user);
}
@Override
public List<User> findAll() {
return userDao.findAll();
}
@Override
public User findById(Integer id) {
return userDao.findById(id);
}
@Override
public List<User> findByPage(UserPage page) {
return userDao.findByPage(page);
}
@Override
public Integer getCount(UserPage page) {
return userDao.getCount(page);
}
}
注意，以下就是spring的applicationContext.xml文件的配置了非常重要：
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<!-- 将所有的配置文件没有放在外面：简单，但可维护性不高 -->
<context:annotation-config/>
<!-- 扫描物理路径及注册 -->
<context:component-scan base-package="com.pb.mybatis.*"/>
<!-- jdbc.properties Directory -->
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="classpath:jdbc.properties"/>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- ScanMapperFiles -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.pb.mybatis.mapper"/>
</bean>
<!-- TransactionManager Contorl-->
<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:advice id="userTxAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" no-rollback-for="java.lang.RuntimeException"/>
<tx:method name="delete*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" no-rollback-for="java.lang.RuntimeException"/>
<tx:method name="update*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" no-rollback-for="java.lang.RuntimeException"/>
<tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
</tx:attributes>
</tx:advice>
<aop:config>
<!--把事务控制在Service层-->
<aop:pointcut id="pc" expression="execution(* com.pb.mybatis.service.*.*(..))"/>
<aop:advisor advice-ref="userTxAdvice" pointcut-ref="pc"/>
</aop:config>
<!-- Dao Bean-->
<bean id="userDao" class="com.pb.mybatis.dao.impl.UserDaoImpl" autowire="byName"/>
<!-- Service Bean -->
<bean id="userService" class="com.pb.mybatis.service.impl.UserServiceImpl" autowire="byName"/>
</beans>
还有一个就是JDBC.properties配置文件：
jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/blog jdbc.username=root jdbc.password=12345
项目目录结构如下：
接下来就测试吧~~~~~~~~~~~~~~~~~