feat: implement mysql connector

pages/api/connection/db_schema.ts

@@ -0,0 +1,31 @@
+import { NextApiRequest, NextApiResponse } from "next";
+import { newConnector } from "@/lib/connectors";
+import { Connection } from "@/types";
+
+// POST /api/connection/db_schema
+// req body: { connection: Connection, db: string }
+// It's mainly used to get the database list.
+const handler = async (req: NextApiRequest, res: NextApiResponse) => {
+  if (req.method !== "POST") {
+    return res.status(405).json([]);
+  }
+
+  const connection = req.body.connection as Connection;
+  const db = req.body.db as string;
+  try {
+    const connector = newConnector(connection);
+    const tableStructures: string[] = [];
+    const tables = await connector.getTables(db);
+    for (const table of tables) {
+      const structure = await connector.getTableStructure(db, table);
+      tableStructures.push(structure);
+    }
+    res.status(200).json(tableStructures);
+  } catch (error) {
+    res.status(400).json({
+      error: error,
+    });
+  }
+};
+
+export default handler;