Spring系列教程六： Spring jdbcTemplate在Dao中的使用

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概念

Spring中的jdbcTemplate的主要作用是实现数据的交互，下面我们就在dao层中如何使用jdbctemplate写测试案例

项目目录如下

基于xml实现jdbctemplate

这里我们使用的是JdbcDaoSupport这个类，主要是为了减少重复每次在dao层都要用的Jdbctemplate set方法

导入jar包

 
            org.springframework
            spring-context
            4.3.6.RELEASE
        
        
            org.springframework
            spring-jdbc
            5.1.6.RELEASE
        
        
            org.springframework
            spring-tx
            5.1.6.RELEASE
        
        
            mysql
            mysql-connector-java
            5.1.6
 

学生实体类

package com.cc.entity;

import java.io.Serializable;

/**
 * 学生实体类
 */
public class Student implements Serializable {

    private int id;
    private String stuno;
    private String name;
    private int classid;

    public int getId() {

        return id;
    }

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

    public String getStuno() {
        return stuno;
    }

    public void setStuno(String stuno) {
        this.stuno = stuno;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getClassid() {
        return classid;
    }

    public void setClassid(int classid) {
        this.classid = classid;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", stuno='" + stuno + '\'' +
                ", name='" + name + '\'' +
                ", classid=" + classid +
                '}';
    }
}

方法接口

package com.cc.dao;

import com.cc.entity.Student;

/**
 * 定义接口
 */
public interface studentDao {
    /**
     * 根据id查找学生
     * @param
     * @return
     */
     Student findStudentbyId(Integer id);
    /**
     * 根据名称查找用户
     */
    Student findStudentbyName(String name);

    /**
     * 更新账户
     */
    void updateStudent(Student student);
}

方法实现类

package com.cc.dao;

import com.cc.entity.Student;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.util.List;

public class StudentDaoImpl extends JdbcDaoSupport implements studentDao {

    @Override
    public Student findStudentbyId(Integer id) {
        List students =getJdbcTemplate().query("select * from student where id=?",new BeanPropertyRowMapper(Student.class),id);
        return students.isEmpty()?null:students.get(0);
    }

    @Override
    public Student findStudentbyName(String name) {
        List students =getJdbcTemplate().query("select * from student where name=?",new BeanPropertyRowMapper(Student.class),name);
        if(students.isEmpty()){
            return null;
        }
        if(students.size()>1){
            throw  new RuntimeException("返回结果集不唯一");
        }
        return students.get(0);
    }

    @Override
    public void updateStudent(Student student) {
        getJdbcTemplate().update("update student set stuno=?,name=?,classid=? where id=?",
                student.getStuno(),student.getName(),student.getClassid(),student.getId());
    }
}

配置文件

测试类

import com.cc.dao.StudentDaoImpl;
import com.cc.entity.Student;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Testjdbctemplate {
    @Autowired
    private StudentDaoImpl student;
    @Test
    public void testfindbyId(){
        ApplicationContext ac=new ClassPathXmlApplicationContext("ApplicationContext.xml");
        StudentDaoImpl student=ac.getBean("studentDao", StudentDaoImpl.class);
        Student stu =student.findStudentbyId(1);
        System.out.println(stu);
    }
    @Test
    public void testfindbyname(){
        ApplicationContext ac=new ClassPathXmlApplicationContext("ApplicationContext.xml");
        StudentDaoImpl student=ac.getBean("studentDao", StudentDaoImpl.class);
        Student stu=student.findStudentbyName("陈多多");
        System.out.println(stu);

        stu.setName("陈多糖");
        student.updateStudent(stu);

    }
}

测试结果如下

 

转载于:https://my.oschina.net/u/4115727/blog/3053235