插入枚举值时如何解决“无法推断用于枚举实例的 SQL 类型”错误？

Question

我正在尝试开发一个简单的 CRUD 应用程序，它接收 JSON 格式的数据，对其进行处理，并将其放入 PostgreSQL 表中。表中的字段之一性别由枚举表示。

在这里，我尝试使用 Postman 添加一个条目：

{
    "employeeId": 1,
    "firstName": "Ada",
    "lastName": "Lovelace",
    "departmentId": 3,
    "jobTitle": "Senior",
    "gender": "FEMALE",
    "dateOfBirth": "1815-12-10"
}

这是 DAO 层代码：

@Override
public void addEmployee(Employee employee) {
    String sql = "INSERT INTO employees(employee_id, first_name, last_name, department_id, job_title, gender, date_of_birth) VALUES (?, ?, ?, ?, ?, CAST(? AS gender), ?)";
    getJdbcTemplate().update(sql, employee.getEmployeeId(), employee.getFirstName(), employee.getLastName(),
            employee.getDepartmentId(), employee.getJobTitle(), employee.getGender(), employee.getDateOfBirth());
}

结果，我得到： 500 Internal Server Error 和

"PreparedStatementCallback; bad SQL grammar [INSERT INTO employees(employee_id, first_name, last_name, department_id, job_title, gender, date_of_birth) VALUES (?, ?, ?, ?, ?, CAST(? AS gender), ?)]; nested exception is org.postgresql.util.PSQLException: Can't infer the SQL type to use for an instance of com.way.dto.Gender. Use setObject() with an explicit Types value to specify the type to use."

Answer 1

性别字段是什么 SQL 类型？

除了传入枚举，您还可以传入等效的字符串，例如employee.getGender().name()或employee.getGender().toString()