Spring 对 JDBC 的支持之jdbcTemplate模板实现增删改查

实例分析：对学生的增删改查

Student类

package com.java1234.model;

public class Student {

   private int id;
   private String name;
   private int age;



   public Student() {
       super();
       // TODO Auto-generated constructor stub
   }


   public Student(String name, int age) {
       super();
       this.name = name;
       this.age = age;
   }

   public Student(int id, String name, int age) {
       super();
       this.id = id;
       this.name = name;
       this.age = age;
   }

   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }

   @Override
   public String toString() {
       return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
   }

}

StudentDao.java接口

l234.dao;

import java.util.List;

import com.java1234.model.Student;

public interface StudentDao {

   public int addStudent(Student student);

   public int updateStudent(Student student);

   public int deleteStudent(int id);

   public List<Student> findStudents();
}

StudentDaoImpl实现类

package com.java1234.dao.impl;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;

import com.java1234.dao.StudentDao;
import com.java1234.model.Student;

public class StudentDaoImpl implements StudentDao{

   private JdbcTemplate jdbcTemplate;

   public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
       this.jdbcTemplate = jdbcTemplate;
   }

   @Override
   public int addStudent(Student student) {
       String sql="insert into t_student values(null,?,?)";
       Object []params=new Object[]{student.getName(),student.getAge()};
       return jdbcTemplate.update(sql,params);
   }

   @Override
   public int updateStudent(Student student) {
       String sql="update t_student set name=?,age=? where id=?";
       Object []params=new Object[]{student.getName(),student.getAge(),student.getId()};
       return jdbcTemplate.update(sql,params);
   }

   @Override
   public int deleteStudent(int id) {
       String sql="delete from t_student where id=?";
       Object []params=new Object[]{id};
       return jdbcTemplate.update(sql,params);
   }

   @Override
   public List<Student> findStudents() {
       String sql="select * from t_student";
       final List<Student> studentList=new ArrayList<Student>();
       jdbcTemplate.query(sql, new RowCallbackHandler(){

           @Override
           public void processRow(ResultSet rs) throws SQLException {
               Student student=new Student();
               student.setId(rs.getInt("id"));
               student.setName(rs.getString("name"));
               student.setAge(rs.getInt("age"));
               studentList.add(student);
           }

       });
       return studentList;
   }

}

StudentService 接口

package com.java1234.service;

import java.util.List;

import com.java1234.model.Student;

public interface StudentService {

   public int addStudent(Student student);

   public int updateStudent(Student student);

   public int deleteStudent(int id);

   public List<Student> findStudents();
}

实现类

package com.java1234.service.impl;

import java.util.List;

import com.java1234.dao.StudentDao;
import com.java1234.model.Student;
import com.java1234.service.StudentService;

public class StudentServiceImpl implements StudentService{

   private StudentDao studentDao;

   public void setStudentDao(StudentDao studentDao) {
       this.studentDao = studentDao;
   }

   @Override
   public int addStudent(Student student) {
       return studentDao.addStudent(student);
   }

   @Override
   public int updateStudent(Student student) {
       return studentDao.updateStudent(student);
   }

   @Override
   public int deleteStudent(int id) {
       return studentDao.deleteStudent(id);
   }

   @Override
   public List<Student> findStudents() {
       return studentDao.findStudents();
}

}

测试类

package com.java1234.test;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.java1234.model.Student;
import com.java1234.service.StudentService;

public class T {

private ApplicationContext ac;

   @Before
   public void setUp() throws Exception {
       ac=new ClassPathXmlApplicationContext("beans.xml");
   }

   @Test
   public void addStudent() {
       StudentService studentService=(StudentService)ac.getBean("studentService");
       int addNums=studentService.addStudent(new Student("王五", 1));
       if(addNums==1){
           System.out.println("添加成功");
       }
   }

   @Test
   public void updateStudent() {
       StudentService studentService=(StudentService)ac.getBean("studentService");
       int updateNums=studentService.updateStudent(new Student(8,"王五2", 2));
       if(updateNums==1){
           System.out.println("更新成功");
       }
   }

   @Test
   public void deleteStudent() {
       StudentService studentService=(StudentService)ac.getBean("studentService");
       int deleteNums=studentService.deleteStudent(8);
       if(deleteNums==1){
           System.out.println("删除成功");
       }
   }

   @Test
   public void findStudents() {
       StudentService studentService=(StudentService)ac.getBean("studentService");
       List<Student> studentList=studentService.findStudents();
       for(Student student:studentList){
           System.out.println(student);
       }
   }

}

beans.xml

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">

//数据源
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>

//数据源信息的文件jdbc.properties
<context:property-placeholder location="jdbc.properties"/>

//spring把datasource数据源注入到jdbcTemplate中
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
   <property name="dataSource" ref="dataSource"></property>
</bean>

   //spring把jdbcTemplate数据源注入到studentDao中
   <bean id="studentDao" class="com.java1234.dao.impl.StudentDaoImpl">
       <property name="jdbcTemplate" ref="jdbcTemplate"></property>
   </bean>

   <bean id="studentService" class="com.java1234.service.impl.StudentServiceImpl">
       <property name="studentDao" ref="studentDao"></property>
   </bean>

</beans>

jdbc.properties文件

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_spring
jdbc.username=root
jdbc.password=217711

Spring 对 JDBC 的支持之jdbcTemplate模板实现增删改查

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