mybatis与spring的整合

整合思路

1、准备jar包
（1）spring的jar包
（2）mybatis的jar包
（3）spring+mybatis的jar包
（4）数据库驱动jar包
（5）数据库连接池jar包

2、创建工程
创建一个普通的java project 工程

3、导入准备的所有jar包

4、创建config文件夹（注意选择source folder）
（1）创建配置文件SqlMApConfig.xml文件，jdbc.properties,log4j.properties.
SqlMapConfig.xml配置

<configuration>
    
    <typeAliases>
    
        <package name="com.project.mybatis.pojo"/>
    typeAliases>

    <mappers>
        <mapper resource="mybatis/User.xml"/>
    mappers>
configuration>

jdbc,properties配置

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_spring?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

log4j.properties配置

# Global logging configuration
log4j.rootLogger=debug, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

（2）创建applicationContext.xml文件

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-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/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

    
    <context:property-placeholder location="classpath:jdbc.properties" />

    
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
    destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        
        <property name="maxActive" value="10"/>
        
        <property name="maxIdle" value="5"/>
    bean>
    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 
    
        <property name="configLocation" value="classpath:SqlMapConfig.xml"/>
    
        <property name="dataSource" ref="dataSource"/>
    
        <property name="typeAliasesPackage" value="com.project.mybatis.pojo" />
    bean>
    


    <bean class="com.project.mybatis.dao.Impl.UserDaoImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    bean>
beans>

5、Dao的开发
（1）创建javabean

package com.project.mybatis.pojo;

public class User {

    private String id;

    private String username;

    private String birthday;

    private String sex;

    private String  address;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", username=" + username + ", birthday=" + birthday + ", sex=" + sex + ", address="
                + address + "]";
    }



}

（2）创建UserDao接口（传统方式，也可以用官方推荐方式，接口不用自己写实现类）

package com.project.mybatis.dao;

import java.util.List;

import com.project.mybatis.pojo.User;

public interface UserDao {

    User getUserById(Integer id);

    List getUserByUserName(String username);

    void insertUser(User user);
}

（3）接口实现类UserDaoImpl

package com.project.mybatis.dao.Impl;

import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import com.project.mybatis.dao.UserDao;
import com.project.mybatis.pojo.User;

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{

    @Override
    public User getUserById(Integer id) {
        SqlSession sqlSession = super.getSqlSession();
        User user = sqlSession.selectOne("user.getUserById",id);
        return user;
    }

    @Override
    public List getUserByUserName(String username) {
        SqlSession sqlSession = super.getSqlSession();
        List users = sqlSession.selectList("user.getUserByUserName",username);
        return users;
    }

    @Override
    public void insertUser(User user) {
        SqlSession sqlSession = super.getSqlSession();
        sqlSession.insert("user.insertUser", user);
    }


}

（4）根据接口创建测试类，用单元测试

package com.project.mybatis.test;

import static org.junit.Assert.*;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.project.mybatis.dao.UserDao;
import com.project.mybatis.pojo.User;

public class UserDaoTest {

    private ApplicationContext applicationContext;

    @Before
    public void init() {
        applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");//要不要写classpath?
    }

    @Test
    public void testGetUserById() {
        UserDao userDao = applicationContext.getBean(UserDao.class);
        User  user = userDao.getUserById(1);
        System.out.println(user);
    }

    @Test
    public void testGetUserByUserName() {
        UserDao userDao = applicationContext.getBean(UserDao.class);
        List users = userDao.getUserByUserName("张");
        for (User user : users) {
            System.out.println(user);
        }
    }

    @Test
    public void testInsertUser() {
        fail("Not yet implemented");
    }

}

（5）user.xml文件，这个应该在Dao之前创建

    <mapper namespace="com.project.mybatis.pojo.User">

                <select id="getUserById" returnType="com.project.mybatis.pojo.User"  parameterType="int">
                    select * from user where id = #{id}
                select>

                <select id="getUserByUserName" parameterType="String" returnType="usecom.project.mybatis.pojo.Userr">
                    select * from user where id = %${value}%
                select>

                <insert id="insertUser" parameterType="com.project.mybatis.pojo.User">
                    insert into user (username,birthday,sex,address) value(#{username},#{birthday},#{sex},#{address});
                insert>

    mapper>

（6）运行测试类。
以上是我的基本思路，有了思路才能好好的干活。当然上面的mysql数据库环境要弄好，还有就是数据库的字段和javabean的一一对应，当然还有数据库的密码和账号要修改成自己的。mybatis是一个非常优秀的持久层框架，在国内现在主流的主要是Hibernate和mybatis，但是Hibernate入门比较难，而且精通更难，所以hibernate的精通人才比mybatis的少，特别是表之间的映射关系设计。再者就是mybatis的SQL比较灵活，易维护。有什么不对的地方请多指教~