SpringBoot整合JDBC

心已赠人 2023-07-01 08:39 15阅读 0赞

# 搭建环境 #

1、创建一个SpringBoot工程![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 1]  
选择如下组件

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 2]  
SpringBoot会自动导入：

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>

2、配置  
![在这里插入图片描述][2020012011173219.png]

spring:
      datasource:
        username: root
        password: 123456
        url: jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC
        driver-class-name: com.mysql.cj.jdbc.Driver

3、测试

@RunWith(SpringRunner.class)
    @SpringBootTest
    public class SpringbootJdbcApplicationTests {
        
    
        @Autowired
        DataSource dataSource;
    
        @Test
        public void contextLoads() throws Exception{
        
            System.out.println(dataSource.getClass());
    
            Connection connection = dataSource.getConnection();
            System.out.println(connection);
            connection.close();
        }
    }

# 原理 #

![在这里插入图片描述][20200120112134321.png]  
1、SpringBoot默认支持的数据源  
**SpringBoot 2.06 以后默认使用的是HikariDataSource数据源，传说这个在数据库访问速度上是C3P0的25倍。\[待分析\]**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 3]  
2、自定义数据源  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 4]

3、操作数据库：**SpringBoot 默认配置了JdbcTemplate，配了数据源就可以直接使用它操作数据库即可。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 5]

@RunWith(SpringRunner.class)
    @SpringBootTest
    public class SpringbootJdbcApplicationTests {
        
    
        @Autowired
        JdbcTemplate jdbcTemplate;
    
        @Test
        public void contextLoads() throws Exception{
        
            List<Map<String, Object>> maps = jdbcTemplate.queryForList("select * from user");
            System.out.println(maps.get(1));
        }
    }

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[2020012011173219.png]: https://img-blog.csdnimg.cn/2020012011173219.png
[20200120112134321.png]: https://img-blog.csdnimg.cn/20200120112134321.png
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