docs: 更新项目文档，完善需求和技术细节

backend/utils/dbConnector.js

@@ -4,12 +4,14 @@
  */
 
 const mysql = require('mysql2/promise');
+const sqlite3 = require('sqlite3').verbose();
 const databaseConfig = require('../config/database');
 
 class DBConnector {
   constructor() {
     this.pool = null;
     this.connection = null;
+    this.db = null;
     this.init();
   }
 
@@ -18,25 +20,31 @@ class DBConnector {
    */
   init() {
     try {
-      this.pool = mysql.createPool({
-        host: databaseConfig.host,
-        port: databaseConfig.port,
-        user: databaseConfig.username,
-        password: databaseConfig.password,
-        database: databaseConfig.database,
-        connectionLimit: databaseConfig.pool.max,
-        acquireTimeout: databaseConfig.pool.acquire,
-        timeout: databaseConfig.pool.idle,
-        charset: 'utf8mb4',
-        timezone: '+08:00',
-        decimalNumbers: true,
-        supportBigNumbers: true,
-        bigNumberStrings: false
-      });
-
-      console.log('✅ 数据库连接池初始化成功');
+      if (databaseConfig.dialect === 'sqlite') {
+        // SQLite配置
+        this.db = new sqlite3.Database(databaseConfig.storage);
+        console.log('✅ SQLite数据库连接成功');
+      } else {
+        // MySQL配置
+        this.pool = mysql.createPool({
+          host: databaseConfig.host,
+          port: databaseConfig.port,
+          user: databaseConfig.username,
+          password: databaseConfig.password,
+          database: databaseConfig.database,
+          connectionLimit: databaseConfig.pool.max,
+          acquireTimeout: databaseConfig.pool.acquire,
+          timeout: databaseConfig.pool.idle,
+          charset: 'utf8mb4',
+          timezone: '+08:00',
+          decimalNumbers: true,
+          supportBigNumbers: true,
+          bigNumberStrings: false
+        });
+        console.log('✅ MySQL数据库连接池初始化成功');
+      }
     } catch (error) {
-      console.error('❌ 数据库连接池初始化失败:', error.message);
+      console.error('❌ 数据库连接初始化失败:', error.message);
       throw error;
     }
   }
@@ -62,19 +70,36 @@ class DBConnector {
    * @returns {Promise} 查询结果
    */
   async query(sql, params = []) {
-    let connection;
-    try {
-      connection = await this.getConnection();
-      const [rows] = await connection.execute(sql, params);
-      return rows;
-    } catch (error) {
-      console.error('❌ SQL执行失败:', error.message);
-      console.error('SQL:', sql);
-      console.error('参数:', params);
-      throw error;
-    } finally {
-      if (connection) {
-        connection.release();
+    if (databaseConfig.dialect === 'sqlite') {
+      // SQLite查询实现
+      return new Promise((resolve, reject) => {
+        this.db.all(sql, params, (err, rows) => {
+          if (err) {
+            console.error('❌ SQL执行失败:', err.message);
+            console.error('SQL:', sql);
+            console.error('参数:', params);
+            reject(err);
+          } else {
+            resolve(rows);
+          }
+        });
+      });
+    } else {
+      // MySQL查询实现
+      let connection;
+      try {
+        connection = await this.getConnection();
+        const [rows] = await connection.execute(sql, params);
+        return rows;
+      } catch (error) {
+        console.error('❌ SQL执行失败:', error.message);
+        console.error('SQL:', sql);
+        console.error('参数:', params);
+        throw error;
+      } finally {
+        if (connection) {
+          connection.release();
+        }
       }
     }
   }