Mybatis第一次实例
自己创建个数据库和表,名字不一样的可以去代码里面找…
<?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>
<typeAlias alias="Student" type="Student" />
</typeAliases>
<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://127.0.0.1:3306/student" />
<property name="username" value="root" />
<property name="password" value="123456" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="Student.xml" />
</mappers>
</configuration>
public class Student {
private int id;
private String name;
public Student() {
super();
}
public int getId() {
return id;
}
public void setId(int student_id) {
this.id = student_id;
}
public String getName() {
return name;
}
public void setName(String student_name) {
this.name = student_name;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
<?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="StudentMapper">
<select id="test" parameterType="int" resultType="Student">
select *
from std_user
where id = #{id}
</select>
</mapper>
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.*;
import java.io.Reader;
public class Tee {
private static SqlSessionFactory sqlSessionFactory;
private static Reader reader;
static {
try {
reader = Resources.getResourceAsReader("Configure.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (Exception e) {
e.printStackTrace();
}
}
public static SqlSessionFactory getSession() {
return sqlSessionFactory;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
SqlSession session = sqlSessionFactory.openSession();
try {
Student area = (Student) session.selectOne(
"StudentMapper.test",1);
if(area!=null){
String userInfo = "name:"+area.getName()+", id:"+area.getId();
System.out.println(userInfo);
}
} finally {
session.close();
}
}
}