SpringBoot整合JDBC的实现

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

    <!--mysql驱动-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtimen</scope>
    </dependency>

    <!--web-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <!--test-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
    </dependency>

    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
    </dependency>
  </dependencies>

spring:
 datasource:
  driver-class-name: com.mysql.cj.jdbc.Driver
  ## 这里如果不配置时区可能会报错，所以配置时区：serverTimezone=UT
  url: jdbc:mysql://localhost:3306/study_springboot?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
  username: root
  password: root

@RunWith(SpringRunner.class)
@SpringBootTest
public class BaseTest {

  @Autowired
  private DataSource dataSource;


  @Test
  public void load(){
    // 打印出：class com.zaxxer.hikari.HikariDataSource
    System.out.println(dataSource.getClass());
  }
}

@RestController
public class TestController {


  @Autowired
  private JdbcTemplate jdbcTemplate;

  @GetMapping("/userList")
  public List<Map<String, Object>> getUserList(){
    String sql = "select * from study_springboot.user";
    List<Map<String, Object>> maps = jdbcTemplate.queryForList(sql);
    return maps;
  }
  @GetMapping("/addUser")
  public String addUser(){

    String sql = "insert into study_springboot.user(id, name, password) values('1', 'zhangsan', 'qqqq')";
    jdbcTemplate.update(sql);

    return "add success";
  }

  /**
   * 可以通过占位符实现入参
   * @param id
   * @return
   */
  @GetMapping("/updateUser/{id}")
  public String updateUser(@PathVariable("id") int id){
    String sql = "update study_springboot.user set name =?, password = ? where id = "+id;

    // 封装占位符
    Object[] objects = new Object[2];
    objects[0] = "李四";
    objects[1] = "pppppp";

    jdbcTemplate.update(sql, objects);
    return "update success";
  }

  @GetMapping("/deleteUser/{id}")
  public String deleteUser(@PathVariable("id") int id){
    String sql = "delete from study_springboot.user where id = ?";
    // int 类型也是一个object，所以这样传参也是可以的
    jdbcTemplate.update(sql, id);

    return "delete success";
  }

}