SpringJdbcTemplate对数据库操作案例

1.了解Spring中JDBC 模块的使用

2.熟悉Spring JDBC 的配置

3.掌握JdbcTemplate 类中几个常用方法

在pojo包下，创建Student实体类，添加id，username,clazz,email的属性和对应的get/set，tostring方法，代码如下。

package com.hxci.pojo;

public class Student {
    private Integer id;
    private String username;
    private String clazz;
    private String email;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getClazz() {
        return clazz;
    }

    public void setClazz(String clazz) {
        this.clazz = clazz;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", username='" + username + ''' +
                ", clazz='" + clazz + ''' +
                ", email='" + email + ''' +
                '}';
    }
}

在dao包下，创建StudentDao类，实现查询，添加等方法，代码如下。

package com.hxci.dao;

import com.hxci.pojo.Student;

import java.util.List;

public interface StudentDao {
    public List query();

    public void add(Student student);

    public void update(Student student);

    public Student queryById(Integer id);

    public void delete(Integer id);
}

分别创建StudentService和StudentServiceImpl，在StudentServiceImpl实现StudentService，代码如下。

StudentService：

package com.hxci.service;

import com.hxci.pojo.Student;

import java.util.List;

public interface StudentService {
    public List query();

    public void add(Student student);

    public void delete(Integer id);

    public void update(Student student);

    public Student queryById(Integer id);

}

StudentServiceImpl：

package com.hxci.service.impl;

import com.hxci.dao.StudentDao;
import com.hxci.pojo.Student;
import com.hxci.service.StudentService;
import com.hxci.util.baseDao;
import org.apache.ibatis.session.SqlSession;

import java.util.List;

public class StudentServiceImpl extends baseDao implements StudentService {

    SqlSession session;
    StudentDao dao;

    public List query() {
        session=getSession();
        dao = session.getMapper(StudentDao.class);
        List list = dao.query();
        closeSession(session);
        return list;
    }


    public void add(Student student) {
        session=getSession();
        dao = session.getMapper(StudentDao.class);
        dao.add(student);
        session.commit();
        closeSession(session);


    }


    public void delete(Integer id) {
        session=getSession();
        dao = session.getMapper(StudentDao.class);
        dao.delete(id);
        session.commit();
        closeSession(session);
    }


    public void update(Student student) {
        session=getSession();
        dao = session.getMapper(StudentDao.class);
        dao.update(student);
        session.commit();
        closeSession(session);
    }


    public Student queryById(Integer id) {
        session=getSession();
        dao = session.getMapper(StudentDao.class);
        Student ById=dao.queryById(id);
        session.commit();
        closeSession(session);
        return ById;
    }


}

代码如下

package com.hxci.util;

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.Reader;

public class baseDao {
    static  SqlSessionFactory sqlMapper ;
    static {
        String resources = "mybatis-config.xml";
        Reader reader=null;
        try {
            reader= Resources.getResourceAsReader(resources);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sqlMapper= new SqlSessionFactoryBuilder().build(reader);
    }

    public SqlSession getSession(){
        SqlSession session=sqlMapper.openSession();
        return session;
    }

    public void closeSession(SqlSession session){
        session.close();
    }
}

实验任务6：创建studentMapper.xml

实现功能，代码如下

    
        select * from student
    
    
        insert into student (username,clazz,email) value (#{username},#{clazz},#{email})
    
    
        delete from student where id=#{id}
    
    
        update student set username=#{username},clazz=#{clazz},email=#{email} where id=#{id}
    
    
        select * from student where id=#{id}
    

实验任务7：创建mybatis-config.xml

代码如下：

实验任务8：创建MybatisTest

代码如下

package com.hxci;

import com.hxci.dao.CustomerDao;
import com.hxci.pojo.Customer;
import com.hxci.pojo.Student;
import com.hxci.service.CustomerService;
import com.hxci.service.StudentService;
import com.hxci.service.impl.CustomerServiceImpl;
import com.hxci.service.impl.StudentServiceImpl;
import org.apache.ibatis.annotations.Mapper;
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 org.junit.jupiter.api.Test;

import java.io.IOException;
import java.io.Reader;
import java.util.List;

public class MybayisTest {

    StudentService service=new StudentServiceImpl();


    public static void main(String[] args) {

        CustomerService service  = new CustomerServiceImpl();
        Customer customer = new Customer();
        customer.setUsername("长远1");
        customer.setPhone("1201");
        customer.setJobs("java");
        service.add(customer);

        List list= service.query();
        System.out.println(list);


    }
    //studentAdd
   @Test
   public void add(){
        StudentService service  = new StudentServiceImpl();
        Student student = new Student();
        student.setUsername("长远1");
        student.setClazz("19J06");
        student.setEmail("2225830583@qq.com");
        service.add(student);

        List list= service.query();
        System.out.println(list);
   }
   @Test
  public void delete(){
        service.delete(1);
   }

   @Test
    public void update(){
        Student student = new Student();
        student.setId(4);
        student.setUsername("da");
        student.setClazz("da");
        student.setEmail("s");
        service.update(student);
   }
   @Test
    public void queryById(){
        Student student=service.queryById(4);
       System.out.println(student);
   }




}

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