本文我們一起看看Spring Boot中 JdbcClient 和 JdbcTemplate 之間的差異。

以下內(nèi)容使用的Java和Spring Boot版本為：

• Java 21
• Spring Boot 3.2.1

假設(shè)我們有一個ICustomerService接口：

public interface ICustomerService {
    
    List<Customer> getAllCustomer();

    Optional<Customer> getCustomerById(int id);

    void insert(Customer customer);

    void update(int id, Customer customer);
    
    void delete(int id);
}

其中，涵蓋了我們常見的數(shù)據(jù)CRUD操作。

下面就來一起看看，分別使用 JDBC Client 和 JDBC Template 的實(shí)現(xiàn)。

初始化對比

JdbcTemplate的初始化：

private final JdbcTemplate jdbcTemplate;

public CustomerJdbcTemplateService(JdbcTemplate jdbcTemplate){
  this.jdbcTemplate = jdbcTemplate;
}

JdbcClient的初始化；

private final JdbcClient jdbcClient;

public CustomerJdbcClientService(JdbcClient jdbcClient){
  this.jdbcClient = jdbcClient;
}

增刪改查的實(shí)現(xiàn)對比

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查詢的實(shí)現(xiàn)對比

getAllCustomer查詢返回集合數(shù)據(jù)的實(shí)現(xiàn)對比：

// jdbcTemplate實(shí)現(xiàn)
private final RowMapper<Customer> rowMapper = (rs, row)
     -> new Customer(rs.getInt("id"), rs.getString("name"), rs.getString("lastname"), rs.getDate("birthday"));

public List<Customer> getAllCustomer() {
  return jdbcTemplate.query("select id, name, lastname, birthday from customer", rowMapper);
}

// jdbcClient實(shí)現(xiàn)
public List<Customer> getAllCustomer(){
  return jdbcClient.sql("select id, name, lastname, birthday from customer").query(Customer.class).list();
}

getCustomerById查詢返回單條數(shù)據(jù)的實(shí)現(xiàn)對比：

// jdbcTemplate實(shí)現(xiàn)
public Optional<Customer> getCustomerById(int id) {
  Customer customer = null;
  try {
    customer = jdbcTemplate.queryForObject("select id, name, lastname, birthday from customer where id = ?", rowMapper,  id );
  } catch (DataAccessException ex){
    LOG.error("Data not found. Id parameter: " + id, ex);
  }
  return Optional.ofNullable(customer);
}

// jdbcClient實(shí)現(xiàn)
public Optional<Customer> getCustomerById(int id){
  return jdbcClient.sql("select id, name, lastname, birthday from customer where id= :id")
                   .param("id", id)
                   .query(Customer.class)
                   .optional();
}

insert插入數(shù)據(jù)的實(shí)現(xiàn)對比

// jdbcTemplate實(shí)現(xiàn)
public void insert(Customer customer) {
  int inserted = jdbcTemplate.update("insert into customer (id, name, lastname, birthday) values (?,?,?,?)",
                 customer.id(), customer.name(), customer.lastname(),customer.birthday());
  Assert.state(inserted == 1 , "An exception error occurred while inserting customer");
}

// jdbcClient實(shí)現(xiàn)
public void insert(Customer customer){
  int inserted = jdbcClient.sql("insert into customer (id, name, lastname, birthday) values (?,?,?,?)")
                .params(List.of(customer.id(), customer.name(), customer.lastname(), customer.birthday()))
                .update();
  Assert.state(inserted == 1 , "An exception error occurred while inserting customer");
}

update更新數(shù)據(jù)的實(shí)現(xiàn)對比

// jdbcTemplate實(shí)現(xiàn)
public void update(int id, Customer customer) {
  int updated = jdbcTemplate.update("update customer set name = ?, lastname = ?, birthday = ? where id = ? ",
                customer.name(), customer.lastname(),customer.birthday(), id);
  Assert.state(updated == 1 , "An exception error occurred while updating customer");
}

// jdbcClient實(shí)現(xiàn)
public void update(int id, Customer customer){
  int updated = jdbcClient.sql("update customer set name = ?, lastname = ?, birthday = ? where id = ?")
                .params(List.of(customer.name(), customer.lastname(), customer.birthday(), id))
                .update();
  Assert.state(updated == 1, "An exception error occurred while updating customer");
}

delete刪除數(shù)據(jù)的實(shí)現(xiàn)對比

// jdbcTemplate實(shí)現(xiàn)
public void delete(int id) {
  int deleted = jdbcTemplate.update("delete from customer where id = ?", id);
  Assert.state(deleted == 1 , "An exception error occurred while deleting customer");
}

// jdbcClient實(shí)現(xiàn)
public void delete(int id) {
  int deleted = jdbcClient.sql("delete from customer where id = :id").param("id",id).update();
  Assert.state(deleted == 1, "An exception error occurred while updating customer");
}

總結(jié)

上面我們分別演示了JdbcClient 和 JdbcTemplate從初始化到真正執(zhí)行增刪改查操作的代碼樣例。總體上來說，JdbcClient的實(shí)現(xiàn)更為簡潔方便。如果不考慮其他ORM框架的情況下，在未來的Spring Boot版本中，我會更偏向于選擇JdbcClient來操作數(shù)據(jù)庫。那么您覺得怎么樣呢？留言區(qū)一起聊聊～

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