相关疑难解决方法(0)

在以下之间使用Spring Data JPA关键字时是否有任何区别:

List<SomeEntity> findBySomeCondition();

和

List<SomeEntity> findAllBySomeCondition();

String  sql = "SELECT (Employee_name, Password) FROM employee WHERE (Employee_name = '"+name+"'  AND Password = '"+password+"')";

并在 JSP java.sql.sqlexception insert operand should contains 1 columns(s) 中出现以下异常

请帮忙。

我正面临一个 mysql 查询问题。我需要将数据从一张表复制到另一张表。我正在使用的查询是：

mysql> insert into voucher (code, amount, expire_at, state, driver_id, asset_account_id, created_at, updated_at, creator_id, agent, voucher_batch_id, image, city_id, country_id, serial_number, updater_id, redeemed_at) select (code, amount, expire_at, state, driver_id, asset_account_id, created_at, updated_at, creator_id, agent, voucher_batch_id, image, city_id, country_id, serial_number, updater_id, redeemed_at) from voucher_log ;

但是，我在执行此操作时遇到以下错误：

错误 1241 (21000)：操作数应包含 1 列