mybatis入门程序
时间: 2023-11-26 15:09:40 浏览: 34
以下是Mybatis入门程序的示例代码:
1. 首先,在pom.xml文件中添加以下依赖:
```
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.5</version>
</dependency>
```
2. 在resources目录下创建一个mybatis-config.xml文件,配置Mybatis的基本信息,如下所示:
```
<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/test"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mapper/UserMapper.xml"/>
</mappers>
</configuration>
```
3. 创建一个User实体类,包含id和name属性,以及对应的getter和setter方法。
4. 创建一个UserMapper.xml文件,定义对User实体类的操作,如下所示:
```
<?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.example.mapper.UserMapper">
<select id="getUserById" parameterType="int" resultType="com.example.entity.User">
select * from user where id = #{id}
</select>
<insert id="addUser" parameterType="com.example.entity.User">
insert into user(name) values(#{name})
</insert>
</mapper>
```
5. 创建一个UserMapper接口,包含对User实体类的操作方法,如下所示:
```
package com.example.mapper;
import com.example.entity.User;
public interface UserMapper {
User getUserById(int id);
void addUser(User user);
}
```
6. 在代码中使用Mybatis进行数据库操作,示例代码如下所示:
```
package com.example;
import com.example.entity.User;
import com.example.mapper.UserMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
public class App {
public static void main(String[] args) throws IOException {
// 加载Mybatis配置文件
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
// 获取SqlSession
SqlSession session = sqlSessionFactory.openSession();
// 获取Mapper接口的代理对象
UserMapper userMapper = session.getMapper(UserMapper.class);
// 调用Mapper接口的方法
User user = userMapper.getUserById(1);
System.out.println(user);
User newUser = new User();
newUser.setName("Tom");
userMapper.addUser(newUser);
session.commit();
// 关闭SqlSession
session.close();
}
}
```
以上就是Mybatis入门程序的示例代码,可以根据自己的需要进行修改和扩展。