ibaties学习笔记(一)

// MyBaties是持久层框架，搭建时需要导入相应的jar包mybatis-3.3.0.jar

// 1.编写相应的配置文件conf.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" />
<!-- 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/test" />
<property name="username" value="root" />
<property name="password" value="123456" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/cc/TestMyBaties/mapping/Student.xml"/>
</mappers>
</configuration>

 // 2.编写实体类

public class Student {
private int sid;
private String sname;
private String sex;

public Student() {
super();
// TODO Auto-generated constructor stub
}
public Student(String sname, String sex) {
super();
this.sname = sname;
this.sex = sex;
}

public int getSid() {
return sid;
}
public void setSid(int sid) {
this.sid = sid;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}

// 3.实体类的映射文件(该映射文件主要是用来操作数据，如SQL语句)

<?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="Student">
<!-- 所返回的例表 -->
<resultMap type="com.cc.TestMyBaties.entity.Student" id="resultListStus">
<id column="sid" property="sid" />
<id column="sname" property="sname" />
<id column="sex" property="sex" />
</resultMap>

<select id="selectStudentById" parameterType="int" resultType="com.cc.TestMyBaties.entity.Student">
select * from Student where sid = #{id}
</select>
<select id="selectStudents" parameterType="int" resultMap="resultListStus">
select * from Student
</select>

<insert id="addStudent" parameterType="com.cc.TestMyBaties.entity.Student" useGeneratedKeys="true" keyProperty="sid">
insert into Student(sname,sex) values(#{sname},#{sex})
</insert>

<update id="editStudent" parameterType="com.cc.TestMyBaties.entity.Student">
update Student set sname=#{sname},sex=#{sex} where sid=#{sid}
</update>

<delete id="delStudent" parameterType="int">
delete from Student where sid=#{sid}
</delete>
</mapper>

// 4.编写连接类

public class MyBatiesUtil {
private static final SqlSessionFactory sessionFactory;

static {
//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
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
}

public static SqlSessionFactory getSessionfactory() {
return sessionFactory;
}
}

 // 5.编写测试类

public class Test extends MyBatiesUtil{

/**
* 根据ID查询
*/
public void findById(){
SqlSession session = this.getSessionfactory().openSession();
String statement = "Student.selectStudentById";//映射sql的标识字符串
//执行查询返回一个唯一user对象的sql
Student student = session.selectOne(statement, 1);
System.out.println("name:" + student.getSname() + "   " + "sex:" + student.getSex());
session.close();
}

public void findAll(){
SqlSession session = this.getSessionfactory().openSession();
String statement = "Student.selectStudents";//映射sql的标识字符串
//执行查询返回一个唯一user对象的sql
List<Student> students = session.selectList(statement);
for(Student stu : students){
System.out.println("name:" + stu.getSname() + "   " + "sex:" + stu.getSex());
}

session.close();
}

public void addStudent() {
Student stu = new Student();
stu.setSname("xiaohong");
stu.setSex("woman");

SqlSession session = this.getSessionfactory().openSession();
String statement = "Student.addStudent";//映射sql的标识字符串
session.insert(statement,stu);
session.commit();
session.close();
}

public void editStudent() {
Student stu = new Student();
stu.setSid(5);
stu.setSname("xiaohong");
stu.setSex("gir");

SqlSession session = this.getSessionfactory().openSession();
String statement = "Student.editStudent";//映射sql的标识字符串
session.update(statement, stu);
session.commit();
session.close();
}

public void delStudent(){
SqlSession session = this.getSessionfactory().openSession();
String statement = "Student.delStudent";//映射sql的标识字符串
session.delete(statement, 1);
session.commit();
session.close();
}

public static void main(String[] args) {
Test test = new Test();
test.delStudent();
}
}