方法一：Spring和mybatis整合

1.1 整合思路

Spring通過單例模式管理SqlSessionFactory。
Spring和mybatis整合生成代理對象，使用SqlSessionFactory創建SqlSession。
持久層的mapper都需要由Spring進行管理。

1.2 整合環境

Spring5.0.2
mybatis3.4.5
Mybatis-Spring-1.3.1.jar
Mybatis和Spring的整合包。早期ibatis和Spring整合是由Spring官方提供。現在mybatis和Spring整合由mybatis提供。

1.3 SqlSessionFactory配置

<?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>
    <!-- 全局配置 -->
    <settings>
        <!-- 延遲加載 -->
        <setting name="lazyLoadingEnabled" value="true"/><!-- 默認false -->
        <setting name="aggressiveLazyLoading" value="false"/><!-- 默認true -->
        <!-- 配置二級緩存，默認開啓 -->
        <setting name="cacheEnabled" value="true"/>
    </settings>
    <!-- 設置別名 -->
    <typeAliases>
        <!-- 批量定義 (mybatis自動掃描包下類，定義別名，別名爲類名)-->
        <package name="com.wzw.sm.model"/>
    </typeAliases>
    <!-- 加載mapper映射文件 -->
    <mappers>
        <!-- 批量加載mapper
            指定mapper接口包名，mybatis自動掃描包下所有的mapper接口
            規範：mapper接口名與mapper.xml文件名保持一致，且在同一目錄下
         -->
        <package name="com.wzw.sm.mapper"/>
    </mappers>
</configuration>

1.4 applicationContext.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://www.springframework.org/schema/beans" 
xmlns:context="http://www.springframework.org/schema/context" 
xmlns:tx="http://www.springframework.org/schema/tx" 
xmlns:aop="http://www.springframework.org/schema/aop" 
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd 
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd ">

    <!-- 加載配置文件 -->
    <context:property-placeholder location="db.properties"/>

    <!-- 1 c3p0連接池配置 -->
    <!-- 1.1 創建ComboPooledDataSource對象 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 1.2 set方法注入屬性 -->
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean> 

    <!-- 創建SqlSessionFactory -->
    <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 加載mybatis配置文件 -->
        <property name="configLocation" value="SqlMapConfig.xml"></property>
        <!-- 配置數據源 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 創建UserMapperImpl -->
    <bean name="userMapperImpl" class="com.wzw.sm.mapper.impl.UserMapperImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>
</beans>

1.5 User.java

package com.wzw.sm.model;

public class User {
    private Integer user_id;
    private String user_name;
    public Integer getUser_id() {
        return user_id;
    }
    public void setUser_id(Integer user_id) {
        this.user_id = user_id;
    }
    public String getUser_name() {
        return user_name;
    }
    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }
    @Override
    public String toString() {
        return "User [user_id=" + user_id + ", user_name=" + user_name + "]";
    }

}

1.6 UserMapper.xml

<?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 namespace="com.wzw.sm.mapper.UserMapper">
    <select id="selectUserById" parameterType="int" resultType="user">
        SELECT * FROM `user` WHERE user_id = #{user_id}
    </select>
</mapper>

1.7 UserMapper.java

public interface UserMapper {
    //根據user_id查詢User
    public User selectUserById(Integer user_id);
}

1.8 UserMapperImpl.java

public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper{

//  private SqlSessionFactory sqlSessionFactory;
//  
//  public SqlSessionFactory getSqlSessionFactory() {
//      return sqlSessionFactory;
//  }
//  public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
//      this.sqlSessionFactory = sqlSessionFactory;
//  }

    @Override
    public User selectUserById(Integer user_id) {
        SqlSession sqlSession = this.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.selectUserById(user_id);
//      sqlSession.close();
        return user;
    }

}

1.9 測試代碼

public class Demo1 {

    @Test
    public void test1() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapperImpl userMapperImpl = (UserMapperImpl) context.getBean("userMapperImpl");
        User user = userMapperImpl.selectUserById(1);
        System.out.println(user);
    }
}

方法二： Spring和mybatis整合（Mapper代理開發）

2.1 db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/sm?useUnicode=true&amp;characterEncoding=utf8
jdbc.username=root
jdbc.password=root

2.2 log4j.properties

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# 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

2.3 applicationContext.xml

<?xml version="1.0" encoding="UTF-8" ?>
<beans 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://www.springframework.org/schema/beans" 
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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd ">
    <!-- 加載配置文件 -->
    <context:property-placeholder location="db.properties"/>

    <!-- 配置數據源 -->
    <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!-- 創建SqlSessionFactory -->
    <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="SqlMapConfig.xml"></property>
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置mapper掃描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.wzw.sm.mapper"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>
</beans>

2.4 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>
    <!-- 全局配置 -->
    <settings>
        <!-- 延遲加載 -->
        <setting name="lazyLoadingEnabled" value="true" /><!-- 默認false -->
        <setting name="aggressiveLazyLoading" value="false" /><!-- 默認true -->
        <!-- 配置二級緩存，默認開啓 -->
        <setting name="cacheEnabled" value="true" />
        <setting name="logImpl" value="LOG4J" />
    </settings>
    <!-- 設置別名 -->
    <typeAliases>
        <!-- 批量定義 (mybatis自動掃描包下類，定義別名，別名爲類名) -->
        <package name="com.wzw.sm.model" />
    </typeAliases>
</configuration>

2.5 User.java

public class User {
    private Integer user_id;
    private String user_name;
    public Integer getUser_id() {
        return user_id;
    }
    public void setUser_id(Integer user_id) {
        this.user_id = user_id;
    }
    public String getUser_name() {
        return user_name;
    }
    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }
    @Override
    public String toString() {
        return "User [user_id=" + user_id + ", user_name=" + user_name + "]";
    }

}

2.6 UserMapper.xml

<?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 namespace="com.wzw.sm.mapper.UserMapper">
    <select id="selectUserById" parameterType="int" resultType="user">
        SELECT * FROM `user` WHERE user_id = #{user_id}
    </select>
</mapper>

2.7 UserMapper.java

public interface UserMapper {
    //根據user_id查詢用戶信息
    public User selectUserById(Integer user_id);
}

2.8 測試類

public class Demo1 {

    @Test
    public void test1() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = (UserMapper) context.getBean("userMapper");
        User user = userMapper.selectUserById(1);
        System.out.println(user);
    }
}

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4-Mybatis-整合Spring

方法一：Spring和mybatis整合

1.1 整合思路

1.2 整合環境

1.3 SqlSessionFactory配置

1.4 applicationContext.xml配置

1.5 User.java

1.6 UserMapper.xml

1.7 UserMapper.java

1.8 UserMapperImpl.java

方法二： Spring和mybatis整合（Mapper代理開發）

2.1 db.properties

2.2 log4j.properties

2.3 applicationContext.xml

2.4 SqlMapConfig.xml

2.5 User.java

2.6 UserMapper.xml

2.7 UserMapper.java

2.8 測試類

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4-設計模式-單例模式

第三章 SpringBoot-整合Mybatis

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