fix pg module import (#84)

Author: wangzuo

generator/client/typescript/templates/queryx/adapter.postgresql.ts

@@ -1,22 +1,22 @@
 // Code generated by queryx, DO NOT EDIT.
 
-import { Pool, QueryResultRow, types } from "pg";
+import pg from "pg";
 import { parse } from "date-fns";
 import { Config } from "./config";
 
-types.setTypeParser(types.builtins.INT8, (val) => parseInt(val, 10));
+pg.types.setTypeParser(pg.types.builtins.INT8, (val) => parseInt(val, 10));
 
 export class Adapter {
   public config: Config;
-  public pool: Pool;
-  public db: Pool;
+  public pool?: pg.Pool;
+  public db?: pg.Pool;
 
   constructor(config: Config) {
     this.config = config;
   }
 
   connect() {
-    const pool = new Pool({
+    const pool = new pg.Pool({
       connectionString: this.config.url,
     });
     this.pool = pool;
@@ -31,20 +31,23 @@ export class Adapter {
     this.db.release();
   }
 
-  private _query<R extends QueryResultRow = any, I extends any[] = any[]>(
+  private _query<R extends pg.QueryResultRow = any, I extends any[] = any[]>(
     query: string,
     args?: I,
   ) {
     let [query1, args1] = rebind<I>(query, args);
     return this.db.query<R, I>(query1, args1);
   }
 
-  async query<R extends QueryResultRow = any>(query: string, ...args: any[]) {
+  async query<R extends pg.QueryResultRow = any>(
+    query: string,
+    ...args: any[]
+  ) {
     const res = await this._query<R>(query, args);
     return res.rows;
   }
 
-  async queryOne<R extends QueryResultRow = any>(
+  async queryOne<R extends pg.QueryResultRow = any>(
     query: string,
     ...args: any[]
   ) {