private void denglubutton_Click(object sender, EventArgs e)
{
//MessageBox.Show(Convert.ToString(yonghuming_textbox.Text == null));
string source = "server=(local) \\SQLEXPRESS;database=users;integrated security=SSPI";
SqlConnection con = new SqlConnection(source);
con.Open();//打开数据库
if (con.State == ConnectionState.Open)
{
MessageBox.Show("数据库连接成功！");
}
string select = "select * from yonghu";
SqlDataAdapter sda = new SqlDataAdapter(select, con);
DataSet ds = new DataSet();
sda.Fill(ds, "yonghu");
int flag = 0;//设置一个标记，判断用户是否登录成功
foreach (DataRow x in ds.Tables["yonghu"].Rows)
{
if (yonghuming_textbox.Text == x["id"].ToString().Trim() && yonghumina_textbox.Text == x["mima"].ToString().Trim())
{
yonghuid = yonghuming_textbox.Text;
yonghumima = yonghumina_textbox.Text;
yonghuname = x["name"].ToString().Trim();
flag = 1;
//MessageBox.Show(x["name"].ToString());
//如果yonghu数据库中的name不为空，则进入用户界面
if (x["name"].ToString().Trim() != String.Empty)//此处用String.Empty而不用null是因为数据库中为赋值的行为“”而不是null
{
//if()
yuhujiemian f3 = new yuhujiemian();
f3.ShowDialog();
}
//否则进入绑定界面
else
{
yonghubangding yhbd = new yonghubangding();
yhbd.ShowDialog();
}
}
}
if (flag == 0)//如果没有登录成功，则显示
{
MessageBox.Show("用户名或密码错误！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
private void button1_Click(object sender, EventArgs e)
{
string select = "select cname from customers";
con = new SqlConnection(source);
con.Open();
if (con.State == ConnectionState.Open)
{
MessageBox.Show("数据库连接成功！");
}
sda = new SqlDataAdapter(select, con);
sda.Fill(ds, "name");
//MessageBox.Show("lalala！");
int flag = 0;//判断customers中是否有输入的姓名
foreach (DataRow x in ds.Tables["name"].Rows)
{
if (textBox1.Text == x["cname"].ToString().Trim())
{
flag = 1;//有的话赋值为1
MessageBox.Show("有这个姓名！");
con2 = new SqlConnection(source2);
string select2 = "select * from yonghu";
sda = new SqlDataAdapter(select2, con2);
sda.Fill(ds2, "yonghu");
foreach (DataRow y in ds2.Tables["yonghu"].Rows)
{
if (y["id"].ToString().Trim() == yonghuyanzhengjiemian.yonghuid)
{
y["name"] = textBox1.Text;
SqlCommandBuilder scb = new SqlCommandBuilder(sda);
sda.Update(ds2, "yonghu");
yonghuyanzhengjiemian.yonghuname = textBox1.Name.Trim();//保存用户名字，方便以后的查询用户个人信息等操作
MessageBox.Show("会员绑定成功！");
//yonghuyanzhengjiemian.yonghuname=
yuhujiemian yh = new yuhujiemian();
yh.ShowDialog();
}
}
}
}
if (flag == 0)
{
MessageBox.Show("你还不是会员！请联系管理员");
}
}