Question

我正在设计一个数据库来存储问题和答案。我计划有5个表：测验，问题，userAnswer和multipleChoice

测验：

/** represents the store when logged out */
interface LoggedOutStore {
  type: 'LOGGED_OUT';
  login: LoggedOut;
}

/** represents the store when logged in */
interface LoggedInStore {
  type: 'LOGGED_IN';
  login: LoggedIn;
}

type LogState = LoggedInStore | LoggedOutStore; // the part of the store with login state
type AppState = LogState & OtherStateFields; // the actual redux store

// dummy components w/ typing
const LoggedInComponent = ({ login }: { login: LoggedIn }) => <></>;
const LoggedOutComponent = ({ logout }: { logout: LoggedOut }) => <></>;

function LogStateComponent(props: LogState) {
  switch (props.type) {
    case 'LOGGED_IN':
      return <LoggedInComponent login={props.login} />;
    case 'LOGGED_OUT':
      return <LoggedOutComponent logout={props.login} />;
  }
}
// Pick<LogState, never> === {}
type ConnectedLogStateComponentType = ConnectedComponentClass<
  typeof LogStateComponent,
  Pick<LogState, never>>;

// this should work in theory; but unfortunately, it needs casting
const ConnectedLogStateComponent = connect((s: AppState): object => s)
  (LogStateComponent) as any as ConnectedLogStateComponentType;

const initState: AppState = {
  login: { isLoading: false, lastAttemptFailed: false },
  type: 'LOGGED_OUT',
};

export const App = () => <Provider store={createStore((s = initState) => s)}>
  <ConnectedLogStateComponent />
</Provider>;

问题：

quizID          (int)(primary key) Auto Increment
quizName        (varchar)

用户：

questionID      (int)(primary key) Auto Increment
quizID          (Foreign Key)
question        (varchar)
questionType    (enum) textbox, multiple choice, int, date, decimal, email, ...

userAnswers：

userID          (int)(primary key) Auto Increment
firstname       (varchar)
surname         (varchar)
...
...

multipleChoice

questionID    (Foreign Key)
userID        (Foreign Key)
answerText
answerDec
answerDate
answerInt

PRIMARY KEY(questionID, userID)

我的问题出在答案表上，一些答案将是自由格式的文本，一些小数和一些整数（外键）

我该如何处理？我是否有4列，每种类型1列？如果是这样，我在检索答案时如何有效地选择3个中的正确者之一，我想尽可能多地执行SQL中的“繁重任务”，而不必使用PHP来生成动态查询。

Answer 1

如果您不需要按答案进行搜索，那么我建议您将它们存储在JSON对象或类似对象中，而不必为单独的表烦恼。

quiz | question   | answers     | multipleChoice
---- | ---------- | ----------- | --------------
1    | "Country?" | [           | true
     |            |   "France", |
     |            |   "Germany" |
     |            | ]           |

如何在狭窄的MySQL表中存储答案

1 个答案: