feat: 添加查询缓存功能，优化数据库查询性能

src/db/index.js

@@ -1,10 +1,26 @@
 import buildKnex from "knex"
 import knexConfig from "../../knexfile.mjs"
 
-const environment = process.env.NODE_ENV || 'development';
-const db = buildKnex(knexConfig[environment]);
+const cache = {}
 
-export default db;
+buildKnex.QueryBuilder.extend("cache", async function () {
+    try {
+        const cacheKey = this.toString()
+        if (cache[cacheKey]) {
+            return cache[cacheKey]
+        }
+        const data = await this
+        cache[cacheKey] = data
+        return data
+    } catch (e) {
+        throw new Error(e)
+    }
+})
+
+const environment = process.env.NODE_ENV || "development"
+const db = buildKnex(knexConfig[environment])
+
+export default db
 
 // async function createDatabase() {
 //     try {
@@ -14,8 +30,8 @@ export default db;
 
 //         // 检查users表是否存在（示例）
 //         const [tableExists] = await db.raw(`
-//       SELECT name 
-//       FROM sqlite_master 
+//       SELECT name
+//       FROM sqlite_master
 //       WHERE type='table' AND name='users'
 //     `)