Mybatis 和Spring整合之原始dao开发

F:\Aziliao\mybatis\代码\31.mybatis与spring整合-开发原始dao

1.1. SqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

    <!-- 通过setting配置mybatis的运行参数
    注意，设置运行参数会影响 mybatis的运行，一定要注意！
    -->
    <settings>
        <!-- 延迟加载的总开关 -->
        <setting name="lazyLoadingEnabled" value="true"/>
        <!-- 设置为false实现按需求加载  -->
        <setting name="aggressiveLazyLoading" value="false"/>
        <!-- 开启二级缓存 -->
        <setting name="cacheEnabled" value="true"/>
    </settings>

    <!-- 定义别名 -->

    <typeAliases>
        <!-- 单个别名定义
        type:类路径
        alias：别名
         -->
        <!-- <typeAlias type="cn.itcast.mybatis.po.User" alias="user"/> -->
        <!-- 批量配置
        指定pojo所在包路径，自动扫描包下的pojo定义别名，别名为类名（首字母小写或大写都可以）
        -->
        <package name="cn.itcast.mybatis.po"/>
        <!-- 如果扫描多个包中的pojo，就写多个 package-->
        <!-- <package name=""/> -->
    </typeAliases>

    <!-- 加载mapper.xml -->
    <mappers>
        <!-- 指定classpath下的映射文件 -->
        <mapper resource="sqlmap/User.xml" />
        <!-- <mapper resource="mapper/UserMapper.xml" /> -->

        <!-- 通过mapper.java进行加载映射
        class指定mapper接口 的路径
        要求：mapper.java文件和mapper.xml同名且在同一个目录
        -->
        <!-- <mapper class="cn.itcast.mybatis.mapper.UserMapper"/> -->

        <!-- 包扫描方式
        指定mapper接口所在包，自动扫描mapper接口进行加载
        要求：mapper.java文件和mapper.xml同名且在同一个目录
        -->
        <package name="cn.itcast.mybatis.mapper"/>
    </mappers>

</configuration>

db.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=123

log4j.properties

# Global logging configuration
#\u5728\u5f00\u53d1\u9636\u6bb5\uff0c\u8bbe\u7f6e\u4e3aDEBUG\uff0c\u5230\u751f\u4ea7\u73af\u5883\u4e0a\u8bbe\u7f6einfo\u6216error\u5c31\u884c\u4e86\u3002
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

1.2 在spring容器中配置sqlSessionFactory  applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    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-3.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">

<!-- 配置数据源dataSource -->
<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 数据库连接池 -->
<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>    

<!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 配置数据源 -->
    <property name="dataSource" ref="dataSource"/>
    <!-- 加载mybatis的配置文件 -->
    <property name="configLocation" value="classpath:SqlMapConfig.xml"/>
</bean>

<!-- 原始dao -->
<bean id="userDao" class="cn.itcast.mybatis.dao.UserDaoImpl">
    <property name="sqlSessionFactory"  ref="sqlSessionFactory"/>
</bean>

</beans>

1.3 Dao接口实现类继承SqlSessionDaoSupport

public interface UserDao {

    //根据用户id查询用户信息
    public User findUserById(int id)throws Exception;
    //根据用户名称模糊查询
    public List<User> findUserByName(String name)throws Exception;
    //添加用户
    public void insertUser(User user) throws Exception;

}

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {

    //由于继承SqlSessionDaoSupport所以这里不用再添加setSqlSessionFacotry方法了。

    @Override
    public User findUserById(int id) throws Exception {

        // Sqlsession定义为局部变量
        SqlSession sqlSession = this.getSqlSession();

        User user = sqlSession.selectOne("test.findUserById", id);

        return user;
    }

    @Override
    public List<User> findUserByName(String name) throws Exception {

        // Sqlsession定义为局部变量
        SqlSession sqlSession = this.getSqlSession();
        List<User> list = sqlSession.selectList("test.findUserByName", "张");

        return list;
    }

    @Override
    public void insertUser(User user) throws Exception {
        // Sqlsession定义为局部变量
        SqlSession sqlSession = this.getSqlSession();
        sqlSession.insert("test.insertUser", user);
    }

}

1.4在spring容器中配置dao

1.15 从spring容器取出dao实例进行测试

public class UserDaoImplTest {

    private ApplicationContext applicationContext;

    @Before
    public void setUp() throws Exception {
        //取出spring的容器
        applicationContext =
                new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
    }

    @Test
    public void testFindUserById() throws Exception {

        //从容器中取出dao
        UserDao userDao = (UserDao) applicationContext.getBean("userDao");
        //调用dao的方法
        User user = userDao.findUserById(1);
        System.out.println(user);

    }

}