Spring boot 使用JdbcTemplate访问数据库

<!-- Spring JDBC 的依赖包，使用 spring-boot-starter-jdbc 或 spring-boot-starter-data-jpa 将会自动获得HikariCP依赖 -->
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- MYSQL包 -->
<dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- 默认就内嵌了Tomcat 容器，如需要更换容器也极其简单-->
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
</dependency>

spring.datasource.url=jdbc:mysql://localhost:3306/chapter4?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&useSSL=false
spring.datasource.password=root
spring.datasource.username=root
#spring.datasource.type
#更多细微的配置可以通过下列前缀进行调整
#spring.datasource.hikari
#spring.datasource.tomcat
#spring.datasource.dbcp2

2018-05-07 10:33:54.021 INFO 9640 --- [   main] o.s.j.e.a.AnnotationMBeanExporter  : Bean with name 'dataSource' has been autodetected for JMX exposure
2018-05-07 10:33:54.026 INFO 9640 --- [   main] o.s.j.e.a.AnnotationMBeanExporter  : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2018-05-07 10:33:54.071 INFO 9640 --- [   main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-05-07 10:33:54.075 INFO 9640 --- [   main] com.battcn.Chapter4Application   : Started Chapter4Application in 3.402 seconds (JVM running for 3.93)

CREATE TABLE `t_user` (
 `id` int(8) NOT NULL AUTO_INCREMENT COMMENT '主键自增',
 `username` varchar(50) NOT NULL COMMENT '用户名',
 `password` varchar(50) NOT NULL COMMENT '密码',
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户表';

package com.battcn.entity;
/**
 * @author Levin
 * @since 2018/5/7 0007
 */
public class User {

 private Long id;
 private String username;
 private String password;
 // TODO 省略get set
}

package com.battcn.controller;
import com.battcn.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
 * @author Levin
 * @since 2018/4/23 0023
 */
@RestController
@RequestMapping("/users")
public class SpringJdbcController {
 private final JdbcTemplate jdbcTemplate;
 @Autowired
 public SpringJdbcController(JdbcTemplate jdbcTemplate) {
  this.jdbcTemplate = jdbcTemplate;
 }
 @GetMapping
 public List<User> queryUsers() {
  // 查询所有用户
  String sql = "select * from t_user";
  return jdbcTemplate.query(sql, new Object[]{}, new BeanPropertyRowMapper<>(User.class));
 }
 @GetMapping("/{id}")
 public User getUser(@PathVariable Long id) {
  // 根据主键ID查询
  String sql = "select * from t_user where id = ?";
  return jdbcTemplate.queryForObject(sql, new Object[]{id}, new BeanPropertyRowMapper<>(User.class));
 }
 @DeleteMapping("/{id}")
 public int delUser(@PathVariable Long id) {
  // 根据主键ID删除用户信息
  String sql = "DELETE FROM t_user WHERE id = ?";
  return jdbcTemplate.update(sql, id);
 }
 @PostMapping
 public int addUser(@RequestBody User user) {
  // 添加用户
  String sql = "insert into t_user(username, password) values(?, ?)";
  return jdbcTemplate.update(sql, user.getUsername(), user.getPassword());
 }
 @PutMapping("/{id}")
 public int editUser(@PathVariable Long id, @RequestBody User user) {
  // 根据主键ID修改用户信息
  String sql = "UPDATE t_user SET username = ? ,password = ? WHERE id = ?";
  return jdbcTemplate.update(sql, user.getUsername(), user.getPassword(), id);
 }
}

package com.battcn;
import com.battcn.entity.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
/**
 * @author Levin
 */
@RunWith(SpringRunner.class)
@SpringBootTest(classes = Chapter4Application.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class Chapter4ApplicationTests {
 private static final Logger log = LoggerFactory.getLogger(Chapter4ApplicationTests.class);
 @Autowired
 private TestRestTemplate template;
 @LocalServerPort
 private int port;
 @Test
 public void test1() throws Exception {
  template.postForEntity("http://localhost:" + port + "/users", new User("user1", "pass1"), Integer.class);
  log.info("[添加用户成功]\n");
  // TODO 如果是返回的集合,要用 exchange 而不是 getForEntity ，后者需要自己强转类型
  ResponseEntity<List<User>> response2 = template.exchange("http://localhost:" + port + "/users", HttpMethod.GET, null, new ParameterizedTypeReference<List<User>>() {
  });
  final List<User> body = response2.getBody();
  log.info("[查询所有] - [{}]\n", body);
  Long userId = body.get(0).getId();
  ResponseEntity<User> response3 = template.getForEntity("http://localhost:" + port + "/users/{id}", User.class, userId);
  log.info("[主键查询] - [{}]\n", response3.getBody());
  template.put("http://localhost:" + port + "/users/{id}", new User("user11", "pass11"), userId);
  log.info("[修改用户成功]\n");
  template.delete("http://localhost:" + port + "/users/{id}", userId);
  log.info("[删除用户成功]");
 }
}