From b4b9256d79b7cdfd99d1b8bf3c17ba2bf61fc992 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E5=87=8C=E8=8A=9D?= <2054884274@qq.com>
Date: Fri, 24 Feb 2023 02:31:16 +0000
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=88=A0=E6=94=B9=E6=9F=A5?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 陈凌芝 <2054884274@qq.com>
---
 .../homework.js"                              | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 "\351\231\210\345\207\214\350\212\235/\346\225\260\346\215\256\345\272\223/homework.js"

diff --git "a/\351\231\210\345\207\214\350\212\235/\346\225\260\346\215\256\345\272\223/homework.js" "b/\351\231\210\345\207\214\350\212\235/\346\225\260\346\215\256\345\272\223/homework.js"
new file mode 100644
index 0000000..6b93c0b
--- /dev/null
+++ "b/\351\231\210\345\207\214\350\212\235/\346\225\260\346\215\256\345\272\223/homework.js"
@@ -0,0 +1,66 @@
+// 作业：建一个用户表（有姓名,年龄,年龄,创建时间,修改时间）,使用模块加mysql模块,实现对数据的增删改查 修改时记得，把修改时间改成修改时的时间，能实现分页（选做）
+// 能实现分页（选做）,能实现男女个数和总数的统计,能统计出（小于18） 和 18-45 和 45岁以上的人数
+var mysql      = require('mysql');
+var connection = mysql.createConnection({
+  host     : '127.0.0.1',
+  user     : 'root',
+  password : 'root',
+  database : 'student'
+});
+let insertSql = "insert into user (`user_name`,`user_age`,`user_sex`,`create_time`,`update_time`) value ('小明',12,'男',null,null)";
+connection.query(insertSql, (err, data) => {
+    console.log("-------------------新增操作-------------------");
+    console.log(err);
+    console.log(data);//insert 操作时 data时对象
+})
+
+var update = new Date().toLocaleString();
+// console.log(update);
+//修改操作
+let updateSql = "update user set update_time='" + update + "' where user_id=3";
+console.log(updateSql)
+connection.query(updateSql, (err, data) => {
+    console.log("-------------------修改操作-------------------");
+    console.log(err);
+    console.log(data);//update 操作时 data时对象
+
+})
+//删除操作
+var deleteSql = "delete from user where user_id=5";
+connection.query(deleteSql, (err, data) => {
+    console.log("-------------------删除操作-------------------");
+    console.log(err);
+    console.log(data);//删除 操作时 data时对象
+});
+connection.query('SELECT count(*) from student', function (err, data) {
+  if (err) throw err;
+  console.log("查询结果学生总数是");
+  console.log(data);
+});
+connection.query('select count(*) from student where user_sex="男"',function (err,data) {
+  if (err) throw err;
+  console.log("查询结果是男的");
+  console.log(data);
+});
+connection.query('select count(*) from student where user_sex="女"',function (err, data) {
+  if (err) throw err;
+  console.log("查询结果是女的");
+  console.log(data);
+});
+connection.query('select count(*) from student where user_age<18',function (err, data) {
+  if (err) throw err;
+  console.log("查询结果小于18是");
+  console.log(data);
+});
+connection.query('select count(*) from student where user_age>=18 and user_age<45',function (err, data) {
+  if (err) throw err;
+  console.log("查询结果大于等于18，小于45是");
+  console.log(data);
+});
+connection.query('select count(*) from student where user_age<45',function (err, data) {
+  if (err) throw err;
+  console.log("查询结果大于45是");
+  console.log(data);
+});
+
+connection.end();
\ No newline at end of file
-- 
Gitee