diff --git a/liu.js b/liu.js
new file mode 100644
index 0000000000000000000000000000000000000000..b45b2de7f79326180a009b9ba5b31e5d5724a056
--- /dev/null
+++ b/liu.js
@@ -0,0 +1,49 @@
+var mysql      = require('mysql');
+var connection = mysql.createConnection({
+  host     : '127.0.0.1',
+  user     : 'root',
+  password : 'root',
+  database : 'student'
+});
+connection.connect();
+let page=1;
+let pageSize=2;
+console.log(new Date().toLocaleString().replace("/","-").replace("/","-"));
+let sql = "select * from student limit " + (page - 1) * pageSize + "," + pageSize;
+connection.query(sql, (err, data) => {
+ 
+  console.log(data);
+ 
+});
+connection.query('SELECT count(*) from student', function (error, results, fields) {
+  if (error) throw error;
+  console.log("查询结果学生总数是");
+  console.log(results);
+});
+connection.query('select count(*) from student where stu_six="男"',function (error, results) {
+  if (error) throw error;
+  console.log("查询结果是男的");
+  console.log(results);
+});
+connection.query('select count(*) from student where stu_six="女"',function (error, results) {
+  if (error) throw error;
+  console.log("查询结果是女的");
+  console.log(results);
+});
+connection.query('select count(*) from student where stu_age<18',function (error, results) {
+  if (error) throw error;
+  console.log("查询结果小于18是");
+  console.log(results);
+});
+connection.query('select count(*) from student where stu_age>=18 and stu_age<45',function (error, results) {
+  if (error) throw error;
+  console.log("查询结果大于等于18，小于45是");
+  console.log(results);
+});
+connection.query('select count(*) from student where stu_age<45',function (error, results) {
+  if (error) throw error;
+  console.log("查询结果大于45是");
+  console.log(results);
+});
+
+connection.end();
\ No newline at end of file