Spring Data学习 02 ： Spring JdbcTe

Spring Data 学习 01 ：JDBC 访问 MySQL

Spring Data 学习 02 ：Spring JdbcTemplate 访问 MySQL

Spring Data 学习 03 ：JPA

Spring Data 学习 04：Spring Data JPA

一、依赖

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.15</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>
    
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

二、创建bean.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:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/student"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    // 创建完StudentDAOSpringJDBCTemplateImpl 后将其添加进来
    <bean id="studentDAO" class="com.springboot.dao.StudentDAOSpringJDBCTemplateImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>
</beans>

三、对bean.xml进行单元测试

package com.springboot.utils;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;

public class DataSourceTest {

    private ApplicationContext ctx = null;

    @Before
    public void setup(){
        ctx = new ClassPathXmlApplicationContext("beans.xml");
    }

    @After
    public void tearDown(){
        ctx = null;
    }

    @Test
    public void testDataSource(){
        DataSource dataSource = (DataSource)ctx.getBean("dataSource");
        Assert.assertNotNull(dataSource);
    }

    @Test
    public void testJdbcTemplate(){
        JdbcTemplate jdbcTemplate= (JdbcTemplate)ctx.getBean("jdbcTemplate");
        Assert.assertNotNull(jdbcTemplate);
    }

}

四、创建 Student DAO接口的实现类 StudentDAOSpringJDBCTemplateImpl

package com.springboot.dao;
import com.springboot.dao.StudentDAO;
import com.springboot.domain.Student;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;

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


public class StudentDAOSpringJDBCTemplateImpl implements StudentDAO {

    // 注入JdbcTemplate 生成getter and setter
    private JdbcTemplate jdbcTemplate;

    public JdbcTemplate getJdbcTemplate() {
        return jdbcTemplate;
    }

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

    // 继承接口的查询
    @Override
    public List<Student> query() {
        final ArrayList<Student> students = new ArrayList<>();
        String sql = "select id, name, age from student";

        jdbcTemplate.query(sql, new RowCallbackHandler() {
            @Override
            public void processRow(ResultSet rs) throws SQLException {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                int age = rs.getInt("age");

                Student student = new Student();
                student.setId(id);
                student.setName(name);
                student.setAge(age);

                students.add(student);
            }
        });
        return students;
    }

    // 继承接口的 添加
    @Override
    public void save(Student student) {
        String sql = "insert into student(name ,age) values (?,?)";
        jdbcTemplate.update(sql,new Object[]{student.getName(),student.getAge()});

    }
}

五、对查询、新增 进行测试

package com.springboot.dao;

import com.springboot.domain.Student;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class StudentDAOSpringJdbcTemplateImplTest {


    private ApplicationContext ctx = null;
    protected StudentDAO studentDAO =null;

    @Before
    public void setup(){
        ctx = new ClassPathXmlApplicationContext("beans.xml");
        studentDAO = (StudentDAO)ctx.getBean("studentDAO");
    }

    @After
    public void tearDown(){
        ctx = null;
    }


    // 查询所有记录
    @Test
    public void testQuery(){
        List<Student> students = studentDAO.query();
        for (Student student:students){
            System.out.println("id"+student.getId()
                    +"name"+student.getName()
                    +"age"+student.getAge()
            );
        }

    }

    // 新增一个记录
    @Test
    public void testSave(){
        Student student = new Student();
        student.setName("小辣椒");
        student.setAge(25);
        studentDAO.save(student);
    }
}