配置数据访问

GitHub Druid官方文档：

https://github.com/alibaba/druid/wiki/%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98

导入jdbc场景依赖

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jdbc</artifactId>
</dependency>

通过修改依赖从而修改数据库连接池的数据源Druid(德鲁伊)

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.10</version>
</dependency>

修改数据源相关配置(Mysql 8以上)：

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/mypratices

  jdbc:
    template:
#      设置三秒超时
      query-timeout: 3

• 底层配置好的连接池是：HikariDataSource

测试SQL语句

@Slf4j
@SpringBootTest
class SpringbootWebAdminApplicationTests {
    @Autowired
    JdbcTemplate jdbcTemplate;
    @Autowired
    DataSource dataSource;

    @Test
    void contextLoads() {
        Long aLong = jdbcTemplate.queryForObject("select count(*) from student",Long.class);
        log.info("记录数{}",aLong);
//        jdbcTemplate.queryForList("select * from student");
        log.info("数据源类型{}",dataSource.getClass());

    }

}

数据源配置类

@Configuration
public class MyDataSourceConfig {
    //绑定配置文件中的配置属性
    @ConfigurationProperties("spring.datasource")
    @Bean
    public DataSource dataSource() throws SQLException {
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setFilters("stat");
        return druidDataSource;
    }

    /**
     * 开启Druid的监控页功能
     * 通过访问http://localhost:8080/druid/ 打开Druid监控页
     * @return
     */
    @Bean
    public ServletRegistrationBean statViewServlet(){
        StatViewServlet viewServlet = new StatViewServlet();
        ServletRegistrationBean<StatViewServlet> registrationBean = new ServletRegistrationBean<>(viewServlet,"/druid/*");
        return registrationBean;
    }
}

设置Druid页面的登录功能

@Bean
public ServletRegistrationBean statViewServlet(){
    StatViewServlet viewServlet = new StatViewServlet();
    ServletRegistrationBean<StatViewServlet> registrationBean = new ServletRegistrationBean<>(viewServlet,"/druid/*");

    //设置Druid页面登录拦截
    registrationBean.addInitParameter("loginUsername","admin");
    registrationBean.addInitParameter("loginPassword","admin");

    return registrationBean;
}

Druid绑定了spring.datasource 所以在.yml配置文件中可以直接进行配置

druidDataSource.setFilters("stat,wall");//加入监控功能,添加防火墙防止SQL注入

等同于

spring:
  datasource:
    filter: stat,wall
    max-active: 10

经典白学...(知其然，更应知其所以然)

以上所有的配置都可以通过添加依赖并在yml文件中添加配置完成

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.17</version>
        </dependency>

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/mypratices

#    filter: stat,wall
#    tomcat:
#      max-active: 10
    druid:
      #      监控页的配置
      stat-view-servlet:
        enabled: true
        login-username: admin
        login-password: admin
        reset-enable: false
      web-stat-filter:
        enabled: true
        url-pattern: /*
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
      aop-patterns: com.laj.admin.*
      filters: stat,wall
      filter:
        stat:
          slow-sql-millis: 1000  #表示超过1000ms的查询都是慢查询 默认是3*1000ms
          log-slow-sql: true  #记录慢查询的SQL
        wall:   #防火墙
          enabled: true
          config:
            drop-table-allow: false #表示不可以删表，所有删除表的操作都被防火墙拦截 

  jdbc:
    template:
#      设置三秒超时
      query-timeout: 3