本文目录
第一步:创建maven工程
在idea中点击File
->New
->Project
,选择maven工程
第二步:添加依赖包
找到工程中的pom.xml
文件,在文pom.xml
文件的dependencies
节点下添加如下依赖包
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.2.7.RELEASE</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.20</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.2</version>
</dependency>
添加完依赖包以后点击maven
同步按钮
第三步:创建数据库和实体类
创建数据库
在数据库中创建一个名字为user
的,给该表增加3个字段分别是id、name、age
创建实体类和Mapper类
目录结构如下:
实体类MyUser
public class MyUser {
private int id;
private String name;
private int age;
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "MyUser{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
'}';
}
}
UserMapper
类
@Repository("userDao")
@Mapper
public interface UserMapper {
MyUser slelectUserById(int id);
List<MyUser> slelectAll();
void insertUser(MyUser myUser);
void updateUser(MyUser user);
void deleteUser(int userId);
}
第四步:添加Mybatis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>
<mappers>
<mapper resource="UserMapper.xml"/>
</mappers>
</configuration>
UserMapper.xml
创建UserMapper.xml
映射文件
<?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.lucas.mybatis.mapper.UserMapper">
<select id="slelectUserById" parameterType="Integer"
resultType="com.lucas.mybatis.model.User">
select * from user where id = #{id}
</select>
<select id="slelectAll" resultType="com.lucas.mybatis.model.User">
select * from user
</select>
<insert id="insertUser" parameterType="com.lucas.mybatis.model.User">
insert into user (name,age) value (#{name},#{age})
</insert>
<update id="updateUser" parameterType="com.lucas.mybatis.model.User">
update user set name= #{name},age= #{age} where id = #{id}
</update>
<delete id="deleteUser" parameterType="Integer">
delete from user where id = #{id}
</delete>
</mapper>
applicationContext.xml
Spring
配置文件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"
xmlns:context="http://www.springframework.org/schema/context"
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
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 配置注解需要扫描的包-->
<context:component-scan base-package="org.example.control"/>
<context:component-scan base-package="org.example.mapper"/>
<!-- 1.配置数据源 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<!-- 1.1.数据库驱动 -->
<property name="driverClassName"
value="com.mysql.cj.jdbc.Driver"></property>
<!-- 1.2.连接数据库的url -->
<property name="url"
value="jdbc:mysql://localhost:3306/springtest?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true"></property>
<!-- 1.3.连接数据库的用户名 -->
<property name="username" value="root"></property>
<!-- 1.4.连接数据库的密码 -->
<property name="password" value="123456"></property>
</bean>
<!-- 开始事务支持-->
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 事务注解-->
<tx:annotation-driven transaction-manager="txManager"/>
<!-- 配置Mybatis工厂,指定数据源,SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<!-- 配置mapper.xml文件 -->
<property name="configLocation" value="mybatis-config.xml"></property>
</bean>
<!-- 使用Spring管理Mybatis数据操作接口-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="org.example.mapper"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
</beans>
创建日志配置文件log4j.properties
# 全局配置
log4j.rootLogger=ERROR,stdout
# MyBatis 日志配置
log4j.logger.org.example=DEBUG
# 控制台输出配置
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
第五步:添加测试代码
Controller
@Controller("userControl")
public class UserControl {
@Autowired
UserMapper userMapper;
public MyUser slelectUserById(int id) {
return userMapper.slelectUserById(id);
}
public List<MyUser> slelectAll() {
return userMapper.slelectAll();
}
public void addUser(MyUser user) {
userMapper.insertUser(user);
}
public void updateUser(MyUser user) {
userMapper.updateUser(user);
}
public void deleteUser(int userId) {
userMapper.deleteUser(userId);
}
}
测试代码
public class App {
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
UserControl userControl = (UserControl) applicationContext.getBean("userControl");
// 增加一条数据
MyUser myUser = new MyUser();
myUser.setAge(30);
myUser.setName("李四");
userControl.addUser(myUser);
// 查询所有的数据
List<MyUser> list = userControl.slelectAll();
for (MyUser myUser1 : list) {
System.out.println(myUser1);
}
// 修改一条数据
MyUser myUser2 = new MyUser();
myUser2.setAge(20);
myUser2.setId(3);
myUser2.setName("王五");
userControl.updateUser(myUser2);
// 删除一条数据
userControl.deleteUser(12);
}
}
运行效果如下:
目录结构
完整的项目结构如下: