个人java学习路线-整合Spring和mybatis
Spring整合Mybatis步骤
1.导入相关jar包
- junit
- mybatis
- mysql数据库
- spring相关
- aop织入
- mybatis-spring【new这里讲】
pom.xml中需导入的包:
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.9</version>
</dependency>
<!-- Spring操作数据库的话,还需要一个spring-jdbc-->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.9</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
</dependencies>
2.原来的mybatis编写配置文件测试(可略)
编写db.properties:
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8
username=root
password=123
//高版本mysql换useSSL=true
实体类:
@Data
public class User {
private Integer id;
private String name;
private String pwd;
}
UserMapper接口:
public interface UserMapper {
List<User> selectUser();
}
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.person.mapper.UserMapper">
<select id="selectUser" resultType="user">
select * from user;
</select>
</mapper>
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>
<properties resource="db.properties" />
<typeAliases>
<package name="com.person.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<package name="com.person.mapper"/>
</mappers>
</configuration>
DBUtil类:
public class DBUtil {
private static SqlSessionFactory sqlSessionFactory;
static {
try {
String resource="mybatis-config.xml";
InputStream inputStream= Resources.getResourceAsStream(resource);
sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSession getSqlSession(){
return sqlSessionFactory.openSession();
}
}
测试代码:
@Test
public void selectUser() {
SqlSession sqlSession= DBUtil.getSqlSession();
UserMapper userMapper=sqlSession.getMapper(UserMapper.class);
List<User> userList = userMapper.selectUser();
for (User user:userList){
System.out.println(user);
}
sqlSession.close();
}
3.Spring整合mybatis代码步骤
1.编写数据源配置
2.sqlSessionFactory
3.sqlSessionTemplate
4.需要给接口加实现类【】
5.将自己写的实现类,注入到Spring中
6.测试使用
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1.编写数据源配置
实体类:
@Data
public class User {
private Integer id;
private String name;
private String pwd;
}
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>
<typeAliases>
<package name="com.person.pojo"/>
</typeAliases>
</configuration>
UserMapper接口:
public interface UserMapper {
List<User> selectUser();
}
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.person.mapper.UserMapper">
<select id="selectUser" resultType="user">
select * from user;
</select>
</mapper>
2.UserMapper实现类:
public class UserMapperImpl implements UserMapper {
//我们的所有操作,都使用sqlSession来执行,在原来,现在都是用SqlSessionTemplate
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> selectUser() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.selectUser();
}
}
3.spring-dao配置(整合配置)
spring-dao.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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.xsd">
<!--
DataSource:使用Spring的数据源替换Mybatis的配置(其它还有c3p0 dbcp druid)
我们这里使用Spring提供的JDBC
-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8" />
<property name="username" value="root" />
<property name="password" value="888666" />
</bean>
<!--sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!--绑定Mybatis配置文件-->
<property name="configLocation" value="classpath:mybatis-config.xml" />
<property name="mapperLocations" value="classpath:com/person/mapper/UserMapper.xml" />
</bean>
<!--SqlSessionTemplate:就是我们使用的sqlSession--><!--用方法二UserMapperImpl2时,这个也可以省略-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate" >
<!--只能使用构造器注入,因为没有set方法-->
<constructor-arg index="0" ref="sqlSessionFactory" />
</bean>
<!-- -->
<bean id="userMapper" class="com.person.mapper.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
</beans>
4.测试代码:
@Test
public void selectUser() {
ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
for (User user : userMapper.selectUser()) {
System.out.println(user);
}
}
4.Spring整合mybatis第二种方法
上面1.编写数据源配置不变
2.UserMapper实现类:
public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{
public List<User> selectUser() {
return getSqlSession().getMapper(UserMapper.class).selectUser();
}
}
3.spring-dao.xml不变
新建文件applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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.xsd">
<import resource="spring-dao.xml" />
<bean id="userMapper2" class="com.person.mapper.UserMapperImpl2">
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
</beans>
4.测试代码:
@Test
public void selectUser2() {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapper userMapper = context.getBean("userMapper2", UserMapper.class);
for (User user : userMapper.selectUser()) {
System.out.println(user);
}
}
事务
回顾事务
事务的ACID原则
- 原子性
- 一致性
- 隔离性
多个业务可能操作同一个资源,防止数据损坏
- 持久性
事务一旦提交,无论系统发生什么问题,结果都不会再被影响,被持久化的写到存储器中!
mybatis-spring的事务
mybatis-spring借助了Spring的DataSourceTransactionManager来实现事务管理
事务分为:
声明式事务:AOP【主要】
编程式事务:需要在代码中间,进行事务的管理
代码实例
实体类:
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private Integer id;
private String name;
private String pwd;
}
UserMapper接口
public interface UserMapper {
List<User> selectUser();
//添加一个用户
int addUser(User user);
//删除一个用户
int deleteUser(int id);
//事务测试
int transaction(User user,int id);
}
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.person.mapper.UserMapper">
<select id="selectUser" resultType="user">
select * from user;
</select>
<insert id="addUser" parameterType="user">
insert into user (name,pwd) values (#{name},#{pwd});
</insert>
<delete id="deleteUser" parameterType="int">
delete from user where id=#{id};
</delete>
</mapper>
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>
<typeAliases>
<package name="com.person.pojo"/>
</typeAliases>
</configuration>
UserMapperImpl类
public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper{
public List<User> selectUser() {
return getSqlSession().getMapper(UserMapper.class).selectUser();
}
public int addUser(User user) {
return getSqlSession().getMapper(UserMapper.class).addUser(user);
}
public int deleteUser(int id) {
return getSqlSession().getMapper(UserMapper.class).deleteUser(id);
}
public int transaction(User user,int id) {
getSqlSession().getMapper(UserMapper.class).addUser(user);
getSqlSession().getMapper(UserMapper.class).deleteUser(id);
return 1;
}
}
spring-dao.xml(事务配置)
<?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: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/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">
<!--
DataSource:使用Spring的数据源替换Mybatis的配置(其它还有c3p0 dbcp druid)
我们这里使用Spring提供的JDBC
-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8" />
<property name="username" value="root" />
<property name="password" value="888666" />
</bean>
<!--sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!--绑定Mybatis配置文件-->
<!--
value="classpath:mybatis-config.xml" 不能有空格
-->
<property name="configLocation" value="classpath:mybatis-config.xml" />
<property name="mapperLocations" value="classpath:com/person/mapper/UserMapper.xml" />
</bean>
<!--配置声明式事务-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<constructor-arg ref="dataSource"/>
<!--<property name="dataSource" ref="dataSource"/>-->
</bean>
<!--结合AOP实现事务的织入-->
<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<!--给哪些方法配置事务-->
<!--配置事务的传播特性: new propagation 默认REQUIRED -->
<!--name得和方法名一致-->
<tx:attributes>
<tx:method name="add" propagation="REQUIRED"/>
<tx:method name="delete" propagation="REQUIRED"/>
<tx:method name="update" propagation="REQUIRED"/>
<tx:method name="query" read-only="true"/>
<tx:method name="transaction" propagation="REQUIRED"/>
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!--配置事务切入-->
<aop:config>
<aop:pointcut id="txPointCut" expression="execution(* com.person.mapper.*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut" />
</aop:config>
</beans>
applicationContext.xml
<?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: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/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<import resource="spring-dao.xml" />
<!--bean-->
<bean id="userMapper" class="com.person.mapper.UserMapperImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>
测试代码:
@Test
public void selectUser() {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
for (User user : userMapper.selectUser()) {
System.out.println(user);
}
}