（本案例是idea下的maven工程）
案例一：mybatis的回顾：
整体流程的回顾：
mybatis： 1.实体类（User）----》属性名和数据库中字段名相对应 2.接口（UserMapper-----》对数据库的增删改查的业务操作的定义 3.接口的配置文件（UserMapper.xml）----》 mappers的namespace属性要写对应的接口； 再写UserMapper接口中增删改查的SQL语句 4.mybatis 的核心配置文件（mybatis-config.xml）--》 日志信息 别名 数据库源 driver，url，username，pwd mapper的映射器 5.测试类： 加载mybatis的核心配置文件 获得sqlSessionFactory对象通过sqlSessionFactoryBuilder 获得sqlSession通过sqlSessionFactory对象 获得实体类对象 sqlSession.getMapper(UserMapper.class)
1.pojo实体类：User
public class User {
private String name;
private String pwd;
private int id;
public User() {
}
public User(String name, String pwd, int id) {
this.name = name;
this.pwd = pwd;
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
public String toString() {
return "User{" +
"name=‘" + name + ‘\‘‘ +
", pwd=‘" + pwd + ‘\‘‘ +
", id=" + id +
‘}‘;
}
}
2.接口 UserMappe
public interface UserMapper {
List<User> getUser();
}
3.接口的配置文件 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.xbf.dao.UserMapper">
<select id="getUser" resultType="User">
select * from user
</select>
</mapper>
4.mybatis的核心配置文件：
<?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>
<!--实体类的别名-->
<typeAliases>
<package name="com.xbf.pojo"/>
</typeAliases>
<!--数据源的配置-->
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC"/>
<property name="username" value="root"/>
<property name="password" value="1234567890"/>
</dataSource>
</environment>
</environments>
<!--mapper映射器-->
<mappers>
<mapper resource="com/xbf/dao/UserMapper.xml"/>
</mappers>
</configuration>
5.测试类的编写：
public class Test {
@org.junit.Test
public void test() throws IOException {
//1.
String resource="mybatis-config.xml";
InputStream in = Resources.getResourceAsStream(resource);
//2.获得sqlSessionFactory对象
SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(in);
//3.获得sqlSession对象 开启事务管理
SqlSession sqlSession = sqlSessionFactory.openSession(true);
//4.实体 mapper
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
//5.执行方法
List<User> user = mapper.getUser();
System.out.println(user);
}
}
案例二：mybatis-spring的整合：
注意：需要在mybatis基础上再导3个包（ spring-webmvc ,编织包（横向织入）,spring-jdbc （spring数据库连接包）,mybatis-spring（Spring-nybatis整合包））:
整体流程的概述：
spring:(过程总结)
1.编写pojo实体类（User）
2.定义接口（UserMapper）---》定义数据库的增删删除操作
3.定义接口的实现类---》
主要是为了sqlSession属性，好在Bean中实现注册
写全接口的增删改查操作
（利用sqlSession.getMapper()实现）
4.编写UserMapper.xml配置文件---》编写增删改查的sql语句
5.编写mybatis核心配置文件---》主要配置UserMapper.xml，数据源信息已不再其中
6.编写applicationContext.xml文件
6.1 数据源的配置；
6.2 通过SqlSessionFactoryBean 创建sqlSessionFactory对象，
并在Spring中配置mybatis核心配置文件
6.3 通过sqlSessionFactory对象创建sqlSession对象
6.4在接口的实现类（UserMapperImpl）加入sqlSession属性
6.5在Spring bean中进行实现类对象的注册
7.测试：
7.1加载 spring配置文件，获得conText对象
7.2获得实现的Bean对象
7.3调用实现类中的增删改查的方法
1.pojo实体类：User
public class User {
private String name;
private String pwd;
private int id;
public User() {
}
public User(String name, String pwd, int id) {
this.name = name;
this.pwd = pwd;
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
public String toString() {
return "User{" +
"name=‘" + name + ‘\‘‘ +
", pwd=‘" + pwd + ‘\‘‘ +
", id=" + id +
‘}‘;
}
}
2.接口的定义：UserMapper
public class UserMapperImpl implements UserMapper {
//添加sqlSession属性
private SqlSession sqlSession;
public void setSqlSession(SqlSession sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> getUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.getUser();
}
}
3.接口实现类的编写：UserMapperImpl
public class UserMapperImpl implements UserMapper {
//添加sqlSession属性
private SqlSession sqlSession;
public void setSqlSession(SqlSession sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> getUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.getUser();
}
}
4.接口的配置文件：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.xbf.dao.UserMapper">
<select id="getUser" resultType="User">
select * from user
</select>
</mapper>
5.mybatisde核心配置文件：mybatis-config.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>
<!--实体类的别名-->
<typeAliases>
<package name="com.xbf.pojo"/>
</typeAliases>
<!--mapper映射器-->
<mappers>
<mapper resource="com/xbf/dao/UserMapper.xml"/>
</mappers>
</configuration>
6.spring 的配置文件：applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--1.数据源信息-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC"/>
<property name="username" value="root"/>
<property name="password" value="1234567890"/>
</bean>
<!--2.创建sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!--3.创建sqlSession-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
<!--4.加入sqlSession属性-->
<!--5.实体类对象的注入-->
<bean id="user" class="com.xbf.dao.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
</beans>
7.测试类的编写：
public class Test {
@org.junit.Test
public void test(){
//1.加载配置文件
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapperImpl user = (UserMapperImpl)context.getBean("user");
List<User> users = user.getUser();
for (User user1 : users) {
System.out.println(user1);
}
}
}
总结：
区别点：
1.数据源的位置不同；
2.spring整合中有了接口的实现类的编写（测试变的更简便）；
原文地址：https://www.cnblogs.com/xbfchder/p/11267184.html
时间： 2024-11-05 21:40:19