重构了translator，写了点数据库、后端api路由

src/lib/db.ts

@@ -24,14 +24,126 @@ export class UserController {
   }
   static async getUserByUsername(username: string) {
     try {
-      const user = await pool.query("SELECT * FROM users WHERE username = $1", [username]);
+      const user = await pool.query("SELECT * FROM users WHERE username = $1", [
+        username,
+      ]);
       return user.rows[0];
     } catch (e) {
       console.log(e);
     }
   }
+  static async deleteUserById(id: number) {
+    try {
+      await pool.query("DELETE FROM users WHERE id = $1", [id]);
+    } catch (e) {
+      console.log(e);
+    }
+  }
 }
 
 export class FolderController {
-  
+  static async getFolderById(id: number) {
+    try {
+      const folder = await pool.query("SELECT * FROM folders WHERE id = $1", [
+        id,
+      ]);
+      return folder.rows[0];
+    } catch (e) {
+      console.log(e);
+    }
+  }
+  static async deleteFolderById(id: number) {
+    try {
+      await pool.query("DELETE FROM folders WHERE id = $1", [id]);
+    } catch (e) {
+      console.log(e);
+    }
+  }
+  static async getFoldersByOwner(owner: string) {
+    try {
+      const folders = await pool.query(
+        "SELECT * FROM folders WHERE owner = $1",
+        [owner],
+      );
+      return folders.rows;
+    } catch (e) {
+      console.log(e);
+    }
+  }
+  static async createFolder(name: string, owner: string) {
+    try {
+      return (
+        await pool.query("INSERT INTO folders (name, owner) VALUES ($1, $2)", [
+          name,
+          owner,
+        ])
+      ).rows[0];
+    } catch (e) {
+      console.log(e);
+    }
+  }
+}
+
+export class WordPairController {
+  static async createWordPair(
+    locale1: string,
+    locale2: string,
+    text1: string,
+    text2: string,
+    folderId: number,
+  ) {
+    try {
+      await pool.query(
+        "INSERT INTO word_pairs (locale1, locale2, text1, text2, folder_id) VALUES ($1, $2, $3, $4, $5)",
+        [locale1, locale2, text1, text2, folderId],
+      );
+    } catch (e) {
+      console.log(e);
+    }
+  }
+  static async getWordPairById(id: number) {
+    try {
+      const wordPair = await pool.query(
+        "SELECT * FROM word_pairs WHERE id = $1",
+        [id],
+      );
+      return wordPair.rows[0];
+    } catch (e) {
+      console.log(e);
+    }
+  }
+  static async deleteWordPairById(id: number) {
+    try {
+      await pool.query("DELETE FROM word_pairs WHERE id = $1", [id]);
+    } catch (e) {
+      console.log(e);
+    }
+  }
+  static async updateWordPairById(
+    id: number,
+    locale1: string,
+    locale2: string,
+    text1: string,
+    text2: string,
+  ) {
+    try {
+      await pool.query(
+        "UPDATE word_pairs SET locale1 = $1, locale2 = $2, text1 = $3, text2 = $4 WHERE id = $5",
+        [locale1, locale2, text1, text2, id],
+      );
+    } catch (e) {
+      console.log(e);
+    }
+  }
+  static async getWordPairsByFolderId(folderId: number) {
+    try {
+      const wordPairs = await pool.query(
+        "SELECT * FROM word_pairs WHERE folder_id = $1",
+        [folderId],
+      );
+      return wordPairs.rows;
+    } catch (e) {
+      console.log(e);
+    }
+  }
 }