using System; using System.Collections.Generic; using System.Data.SqlClient; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { //读取用户名密码 string name = textBox1.Text; string upass = textBox2.Text; //连接数据库 SqlConnection conn = new SqlConnection("server=.;database='进销存';user=sa;pwd=123456"); conn.Open(); //写执行语句 SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = "select * from users where name like @name and upass like @upass"; cmd.Parameters.Add("@name",name); cmd.Parameters.Add("upass", upass); //执行sql语句返回查询内容 SqlDataReader dr = cmd.ExecuteReader(); //读取dr if (dr.Read()) { 采购入库单 m = new 采购入库单(); this.Owner = m; this.Visible = false; m.Show(); } else { MessageBox.Show("登陆失败!"); } conn.Close(); } private void button2_Click(object sender, EventArgs e) { //添加数据到数据库 string username = textBox1.Text; string upass = textBox2.Text; //连接数据库 SqlConnection conn = new SqlConnection("server=.;database='进销存';user=sa;pwd=123456"); conn.Open(); SqlCommand cmd = conn.CreateCommand(); cmd.CommandText = "insert into users values(' " + username + "','" + upass + "')"; //增删改 int count= cmd.ExecuteNonQuery(); if (count > 0) { MessageBox.Show("注册成功!"); } else { MessageBox.Show("注册失败!"); } }