pom.xml 新增
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.18</version>
</dependency>
</dependencies>
resources.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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="?"/>
<property name="username" value="?"/>
<property name="password" value="?"/>
</dataSource>
</environment>
</environments>
<mappers>
<!-- <package name="mapping/BookMapper.xml"/>-->
<mapper resource="mapping/BookMapper.xml"/>
</mappers>
</configuration>
resources.mapping.BookMapper.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.yao.mapper.BookMapper">
<select id="loadBook" resultType="com.yao.pojo.Book">
select * from books where id = #{id}
</select>
</mapper>
Book.class
public class Book {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
BookMapper.class
public interface BookMapper {
Book loadBook(int id);
}
Test1.class
public class Test1 {
public static void main(String[] args) throws Exception{
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession session=sqlSessionFactory.openSession(true);
BookMapper mapper=session.getMapper(BookMapper.class);
Book book=mapper.loadBook(1);
System.out.println(book.getName());
session.close();
}
}
ps:注意路径的完整性
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