使用小结：
1、配置数据库连接文件con.xml
2、配置sql映射文件.xml 或者使用注解接口文件
3、写pojo 的java文件
4、调用mybatis
001
<?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" />
<!-- 配置数据库连接信息 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/springboot?useSSL=false" />
<property name="username" value="root" />
<property name="password" value="aer442" />
</dataSource>
</environment>
</environments>
<mappers>
<!-- 注册userMapper.xml文件，
userMapper.xml位于me.gacl.mapping这个包下，所以resource写成me/gacl/mapping/userMapper.xml-->
<mapper resource="userMapper.xml"/>
<mapper class="UserMapperI"/>
</mappers>
</configuration>
002
import java.util.List;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
public interface UserMapperI {
//使用@Insert注解指明add方法要执行的SQL
@Insert("insert into t_user(name, age) values(#{name}, #{age})")
@Options(useGeneratedKeys=true)
public int add(User user);
//使用@Delete注解指明deleteById方法要执行的SQL
@Delete("delete from users where id=#{id}")
public int deleteById(int id);
//使用@Update注解指明update方法要执行的SQL
@Update("update users set name=#{name},age=#{age} where id=#{id}")
public int update(User user);
//使用@Select注解指明getById方法要执行的SQL
@Select("select * from users where id=#{id}")
public User getById(int id);
//使用@Select注解指明getAll方法要执行的SQL
@Select("select * from users")
public List<User> getAll();
}
002-001
<?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="me.gacl.mapping.userMapper">
<select id="getUser"
resultType="User">
select * from t_user where name like #{name}
</select>
<insert id="addUser" parameterType="User" keyProperty="id" useGeneratedKeys="true">
insert into t_user(name,age) values (#{name},#{age})
</insert>
</mapper>
003
/**
* @author gacl
* users表所对应的实体类
*/
public class User {
//实体类的属性和表的字段名称一一对应
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 "User [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
004
import java.io.InputStream;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
//System.out.println("hello world!MyBatis|!!!!");
/*
//mybatis的配置文件
//String resource = "conf.xml";
//使用类加载器加载mybatis的配置文件（它也加载关联的映射文件）
//InputStream is = Test.class.getClassLoader().getResourceAsStream(resource);
//构建sqlSession的工厂
//SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);
//使用MyBatis提供的Resources类加载mybatis的配置文件（它也加载关联的映射文件）
//Reader reader = Resources.getResourceAsReader(resource);
//构建sqlSession的工厂
//SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
//创建能执行映射文件中sql的sqlSession
//SqlSession session = sessionFactory.openSession();
/**
* 映射sql的标识字符串，
* me.gacl.mapping.userMapper是userMapper.xml文件中mapper标签的namespace属性的值，
* getUser是select标签的id属性值，通过select标签的id属性值就可以找到要执行的SQL
*/
//String statement = "me.gacl.mapping.userMapper.getUser";//映射sql的标识字符串
//执行查询返回一个唯一user对象的sql
//User user = session.selectOne(statement, 12);
//System.out.println(user);
//Test.addUser();
//Test.addUserByNote();
Test.searchUser();
}
public static void searchUser() {
String resource = "conf.xml" ;
InputStream is = Test.class.getClassLoader().getResourceAsStream(resource);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession session = sessionFactory.openSession();
String statement = "me.gacl.mapping.userMapper.getUser";
User user1 = new User();
user1.setName("abc");
user1.setAge(13);
List<User> u = session.selectList(statement, "a%");//返回一个集合参数是一个字符串
//User user = session.selectOne(statement,user1) ; //查询返回单个对象，参数是一个对象
System.out.println(u);
}
public static void addUserByNote() {
String resource = "conf.xml" ;
InputStream is = Test.class.getClassLoader().getResourceAsStream(resource);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession session = sessionFactory.openSession();
UserMapperI m = session.getMapper(UserMapperI.class);
User user = new User();
user.setName("dddd");
user.setAge(38);
int add = m.add(user) ;
//session.g
//session.commit();
session.close();
System.out.println(user.getId());
}
public static void addUser() {
//SqlSession sqlSession = MyBatisU
String resource = "conf.xml" ;
InputStream is = Test.class.getClassLoader().getResourceAsStream(resource);
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession session = sessionFactory.openSession();
String statement = "me.gacl.mapping.userMapper.addUser";
User u = new User();
u.setAge(30);
u.setName("aerly");
int r = session.insert(statement,u);
session.commit();
session.close();
System.out.println(u.getId());
//System.out.println(r);
}
}
参考文件：
1、
MyBatis学习总结 一
2、
MyBatis学习总结 二
3、
MyBatis 文档说明