From deb6fcf7f6c3aa3b71db8dde67458a94e8fd0511 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=A8=E8=8C=97=E5=8D=9A?= <1072852081@qq.com>
Date: Fri, 3 Mar 2023 11:13:48 +0800
Subject: [PATCH] 1

---
 .../\346\225\260\346\215\256\345\272\223.js"  | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 "\346\235\250\350\214\227\345\215\232/yang/\346\225\260\346\215\256\345\272\223.js"

diff --git "a/\346\235\250\350\214\227\345\215\232/yang/\346\225\260\346\215\256\345\272\223.js" "b/\346\235\250\350\214\227\345\215\232/yang/\346\225\260\346\215\256\345\272\223.js"
new file mode 100644
index 0000000..fbc6716
--- /dev/null
+++ "b/\346\235\250\350\214\227\345\215\232/yang/\346\225\260\346\215\256\345\272\223.js"
@@ -0,0 +1,28 @@
+//作业:第一个能不能使用promise的异步函数,封装下数据库的查询
+let mysql =require('mysql');
+
+let conn = mysql.createConnection({
+    host:"localhost",
+    user:"root",
+    password:"root",    
+    database:"123"
+});
+conn.connect(); 
+
+
+function usePromise(sql){
+    return new Promise((resolve,reject)=>{
+        conn.query(sql,(err,data)=>{
+            if(err!=null)reject(err);//有错误调用   
+            resolve(data);//无错误调用
+            conn.end();
+        })
+    })
+}
+
+async function doAsync(sql){
+    let a = await usePromise(sql);
+    console.log(a);
+}
+
+doAsync("select * from stu where stu_name = '张三'");
\ No newline at end of file
-- 
Gitee