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

 <dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.6.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.1.6.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>5.1.6.RELEASE</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.6</version></dependency>

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

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><bean id="studentDao" class="com.cc.dao.StudentDaoImpl"><property name="dataSource" ref="dataSource"></property></bean><!-- 配置数据源--><bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"><property name="driverClassName" value="com.mysql.jdbc.Driver"></property><property name="url" value="jdbc:mysql://localhost:3306/fresh?characterEncoding=UTF-8"></property><property name="username" value="root"></property><property name="password" value="root"></property></bean>
</beans>

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 {@Autowiredprivate StudentDaoImpl student;@Testpublic void testfindbyId(){ApplicationContext ac=new ClassPathXmlApplicationContext("ApplicationContext.xml");StudentDaoImpl student=ac.getBean("studentDao", StudentDaoImpl.class);Student stu =student.findStudentbyId(1);System.out.println(stu);}@Testpublic 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