diff --git a/src/lib/database/connection.ts b/src/lib/database/connection.ts
index 1c7b0df..304509c 100644
--- a/src/lib/database/connection.ts
+++ b/src/lib/database/connection.ts
@@ -5,6 +5,15 @@ import * as T from "./type";
 // see: https://dev.mysql.com/doc/mysql-port-reference/en/mysql-ports-reference-tables.html#mysql-client-server-ports
 const mysqlDefaultPort = 3306;
 
+export interface ConnectionOptions {
+  host: string;
+  user: string;
+  password: string;
+  database: string;
+  port: number;
+  ssl?: string | SslOptions;
+}
+
 export class SQL {
   //connection: mysql.Connection;
   pool: T.Pool;
@@ -16,14 +25,7 @@ export class SQL {
     database,
     port = mysqlDefaultPort,
     ssl,
-  }: {
-    host: string;
-    user: string;
-    password: string;
-    database: string;
-    port: number;
-    ssl?: string | SslOptions;
-  }) {
+  }: ConnectionOptions) {
     const config: PoolOptions = {
       host,
       user,
diff --git a/src/lib/main.ts b/src/lib/main.ts
index a6adff5..1ecba96 100644
--- a/src/lib/main.ts
+++ b/src/lib/main.ts
@@ -1,6 +1,5 @@
 // this file is used for the package. The server should use the other files directly
 import * as Connection from "./database/connection";
-import { Database } from "./database/type";
 import * as Exec from "./exec";
 import * as T from "./type";
 import { addColumnsToModel } from "./model/utils";
@@ -17,17 +16,11 @@ export class Main {
   options: Options;
 
   constructor(
-    c: Database,
+    c: Connection.ConnectionOptions,
     model: T.Entity[],
     options: Options = { legacyMode: false }
   ) {
-    this.s = new Connection.SQL(
-      c.host,
-      c.username,
-      c.password,
-      c.database,
-      c.port
-    );
+    this.s = new Connection.SQL(c);
 
     addColumnsToModel(model);
     this.model = model;
diff --git a/src/service/database/index.ts b/src/service/database/index.ts
index 1fac730..3dd165d 100644
--- a/src/service/database/index.ts
+++ b/src/service/database/index.ts
@@ -50,13 +50,15 @@ export const getPool = (
   const pool = Connection.databases.get(pid);
 
   if (!pool) {
-    const pool = new Connection.SQL(
-      db.host,
-      db.username,
-      db.password,
-      db.database,
-      db.port
-    );
+    const connection = {
+      host: db.host,
+      user: db.username,
+      password: db.password,
+      port: db.port,
+      database: db.database,
+    };
+
+    const pool = new Connection.SQL(connection);
     Connection.databases.set(pid, pool);
 
     return pool;