第一版提交，答题功能OK，题库管理待完善
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218
api/models/examSubject.ts
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218
api/models/examSubject.ts
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import { v4 as uuidv4 } from 'uuid';
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import { get, query, run } from '../database';
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export type QuestionType = 'single' | 'multiple' | 'judgment' | 'text';
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export interface ExamSubject {
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id: string;
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name: string;
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totalScore: number;
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timeLimitMinutes: number;
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typeRatios: Record<QuestionType, number>;
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categoryRatios: Record<string, number>;
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createdAt: string;
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updatedAt: string;
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}
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type RawSubjectRow = {
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id: string;
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name: string;
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typeRatios: string;
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categoryRatios: string;
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totalScore: number;
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timeLimitMinutes: number;
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createdAt: string;
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updatedAt: string;
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};
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const parseJson = <T>(value: string, fallback: T): T => {
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try {
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return JSON.parse(value) as T;
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} catch {
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return fallback;
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}
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};
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const validateRatiosSum100 = (ratios: Record<string, number>, label: string) => {
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const values = Object.values(ratios);
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if (values.length === 0) throw new Error(`${label}不能为空`);
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if (values.some((v) => typeof v !== 'number' || Number.isNaN(v) || v < 0)) {
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throw new Error(`${label}必须是非负数字`);
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}
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const sum = values.reduce((a, b) => a + b, 0);
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if (Math.abs(sum - 100) > 0.01) {
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throw new Error(`${label}总和必须为100`);
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}
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};
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export class ExamSubjectModel {
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static async findAll(): Promise<ExamSubject[]> {
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const sql = `
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SELECT
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id,
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name,
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type_ratios as typeRatios,
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category_ratios as categoryRatios,
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total_score as totalScore,
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duration_minutes as timeLimitMinutes,
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created_at as createdAt,
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updated_at as updatedAt
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FROM exam_subjects
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ORDER BY created_at DESC
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`;
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const rows: RawSubjectRow[] = await query(sql);
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return rows.map((row) => ({
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id: row.id,
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name: row.name,
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totalScore: row.totalScore,
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timeLimitMinutes: row.timeLimitMinutes,
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typeRatios: parseJson<Record<QuestionType, number>>(row.typeRatios, {
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single: 40,
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multiple: 30,
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judgment: 20,
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text: 10
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}),
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categoryRatios: parseJson<Record<string, number>>(row.categoryRatios, { 通用: 100 }),
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createdAt: row.createdAt,
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updatedAt: row.updatedAt
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}));
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}
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static async findById(id: string): Promise<ExamSubject | null> {
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const sql = `
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SELECT
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id,
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name,
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type_ratios as typeRatios,
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category_ratios as categoryRatios,
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total_score as totalScore,
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duration_minutes as timeLimitMinutes,
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created_at as createdAt,
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updated_at as updatedAt
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FROM exam_subjects
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WHERE id = ?
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`;
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const row: RawSubjectRow | undefined = await get(sql, [id]);
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if (!row) return null;
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return {
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id: row.id,
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name: row.name,
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totalScore: row.totalScore,
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timeLimitMinutes: row.timeLimitMinutes,
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typeRatios: parseJson<Record<QuestionType, number>>(row.typeRatios, {
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single: 40,
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multiple: 30,
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judgment: 20,
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text: 10
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}),
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categoryRatios: parseJson<Record<string, number>>(row.categoryRatios, { 通用: 100 }),
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createdAt: row.createdAt,
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updatedAt: row.updatedAt
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};
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}
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static async create(data: {
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name: string;
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totalScore: number;
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timeLimitMinutes?: number;
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typeRatios: Record<QuestionType, number>;
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categoryRatios?: Record<string, number>;
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}): Promise<ExamSubject> {
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const name = data.name.trim();
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if (!name) throw new Error('科目名称不能为空');
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if (!data.totalScore || data.totalScore <= 0) throw new Error('总分必须为正整数');
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const timeLimitMinutes = data.timeLimitMinutes ?? 60;
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if (!Number.isInteger(timeLimitMinutes) || timeLimitMinutes <= 0) throw new Error('答题时间必须为正整数(分钟)');
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validateRatiosSum100(data.typeRatios, '题型比重');
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const categoryRatios = data.categoryRatios && Object.keys(data.categoryRatios).length > 0 ? data.categoryRatios : { 通用: 100 };
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validateRatiosSum100(categoryRatios, '题目类别比重');
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const id = uuidv4();
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const sql = `
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INSERT INTO exam_subjects (
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id, name, type_ratios, category_ratios, total_score, duration_minutes, updated_at
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) VALUES (?, ?, ?, ?, ?, ?, datetime('now'))
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`;
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try {
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await run(sql, [
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id,
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name,
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JSON.stringify(data.typeRatios),
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JSON.stringify(categoryRatios),
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data.totalScore,
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timeLimitMinutes
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]);
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} catch (error: any) {
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if (error.code === 'SQLITE_CONSTRAINT_UNIQUE') {
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throw new Error('科目名称已存在');
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}
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throw error;
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}
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return (await this.findById(id)) as ExamSubject;
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}
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static async update(id: string, data: {
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name: string;
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totalScore: number;
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timeLimitMinutes?: number;
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typeRatios: Record<QuestionType, number>;
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categoryRatios?: Record<string, number>;
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}): Promise<ExamSubject> {
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const existing = await this.findById(id);
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if (!existing) throw new Error('科目不存在');
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const name = data.name.trim();
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if (!name) throw new Error('科目名称不能为空');
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if (!data.totalScore || data.totalScore <= 0) throw new Error('总分必须为正整数');
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const timeLimitMinutes = data.timeLimitMinutes ?? 60;
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if (!Number.isInteger(timeLimitMinutes) || timeLimitMinutes <= 0) throw new Error('答题时间必须为正整数(分钟)');
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validateRatiosSum100(data.typeRatios, '题型比重');
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const categoryRatios = data.categoryRatios && Object.keys(data.categoryRatios).length > 0 ? data.categoryRatios : { 通用: 100 };
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validateRatiosSum100(categoryRatios, '题目类别比重');
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const sql = `
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UPDATE exam_subjects
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SET name = ?, type_ratios = ?, category_ratios = ?, total_score = ?, duration_minutes = ?, updated_at = datetime('now')
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WHERE id = ?
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`;
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try {
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await run(sql, [
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name,
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JSON.stringify(data.typeRatios),
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JSON.stringify(categoryRatios),
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data.totalScore,
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timeLimitMinutes,
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id
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]);
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} catch (error: any) {
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if (error.code === 'SQLITE_CONSTRAINT_UNIQUE') {
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throw new Error('科目名称已存在');
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}
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throw error;
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}
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return (await this.findById(id)) as ExamSubject;
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}
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static async delete(id: string): Promise<void> {
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const existing = await this.findById(id);
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if (!existing) throw new Error('科目不存在');
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const taskCount = await get(`SELECT COUNT(*) as total FROM exam_tasks WHERE subject_id = ?`, [id]);
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if (taskCount && taskCount.total > 0) {
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throw new Error('该科目已被考试任务使用，无法删除');
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}
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await run(`DELETE FROM exam_subjects WHERE id = ?`, [id]);
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}
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}
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