1.pom.xml导入依赖
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</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>5.3.19</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.26</version> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.3.18</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> </dependencies> <!--可以解决静态资源无法导入问题--> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build>
1.1上面的build配置可以解决静态资源无法导入问题
2.实体类 User
根据数据库写实体类
package com.peng.pojo; public class User { private int id; private String name; private String pwd; public User() { } public User(int id, String name, String pwd) { this.id = id; this.name = name; this.pwd = pwd; } public int getId() { return id; } public void setId(int id) { 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; } @Override public String toString() { return "User{" + "id=" + id + ", name='" + name + '\'' + ", pwd='" + pwd + '\'' + '}'; } }
3.接口 UserMapper
import com.peng.pojo.User; import java.util.List; public interface UserMapper { public List<User> selectUser(); public int addUser(User user); public int deleteUSer(int id); public int updateUser(User user); }
4.SQL实现文件 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.peng.mapper.UserMapper"> <select id="selectUser" resultType="user"> select *from mybatis.user </select> <insert id="addUser" parameterType="user" > insert into mybatis.user(id, name, pwd) value (#{id},#{name},#{pwd}) </insert> <delete id="deleteUSer" parameterType="int" > delete from mybatis.user where id=#{id} </delete> <update id="updateUser" parameterType="user" > update mybatis.user set name=#{name},pwd=#{pwd} where id=#{id} </update> </mapper>
5.mybatis-config.xml mybatis基础文件，只留下基础配置例如别名…
<?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.peng.pojo"/> </typeAliases> <!--别名设置留下--> </configuration>
6.spring-mybatis.xml 通过Spring方式配置sqlSessionFactory
<?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"> <!--数据源配置--> <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&characterEncoding=utf8&useUnicode=true"/> <property name="username" value="root"/> <property name="password" value="1234"/> </bean> <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"/> <!--绑定xml文件--> <property name="mapperLocations" value="classpath:com/peng/mapper/*.xml"/> </bean> <!--SqlSessionTemplate就是sqlSession--> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <!--只能通过构造器注入sqlSessionFactory因为他没有set方法--> <constructor-arg index="0" ref="sqlSessionFactory"/> </bean> </beans>
7.注入实现类 UserMapperImpl
package com.peng.mapper; import com.peng.pojo.User; import org.mybatis.spring.SqlSessionTemplate; import java.util.List; public class UserMapperImpl implements UserMapper{ private SqlSessionTemplate sqlSession; public void setSqlSession(SqlSessionTemplate sqlSession) { this.sqlSession = sqlSession; } @Override public List<User> selectUser() { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.selectUser(); } @Override public int addUser(User user) { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.addUser(user); } @Override public int deleteUSer(int id) { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.deleteUSer(id); } @Override public int updateUser(User user) { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.updateUser(user); } }
8.applicationContext.xml 导入spring的sqlSessionFactory配置只负责注入实现类
<?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-mybatis.xml"/> <bean id="userMapper" class="com.peng.mapper.UserMapperImpl"> <property name="sqlSession" ref="sqlSession"/> </bean> </beans>
9.测试类
import com.peng.mapper.UserMapper; import com.peng.pojo.User; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; public class MyTest { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); UserMapper userMapper = context.getBean("userMapper", UserMapper.class); int i = userMapper.addUser(new User(2, "pengge", "123456")); if (i>0){ System.out.println("增加成功"); } int i1 = userMapper.updateUser(new User(1, "龙仔", "111111")); if (i1>0){ System.out.println("修改成功"); } int i2 = userMapper.deleteUSer(7); if (i2>0){ System.out.println("删除成功"); } List<User> users = userMapper.selectUser(); for (User user : users) { System.out.println(user); } } }
结果：
