如何使用Visual Studio和C＃将数据插入数据库并将其保存到数据库中？

Question

public string ss = "Data Source=D\\SQLEXPRESS;Initial Catalog=gym;Integrated Security=True";

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
    string q2 = "insert into gym.dbo.customer (name, weight, height, add_class, gender, fees) values ('" + this.textBox1.Text + "','" + this.textBox2.Text + "','" + this.textBox3.Text + "','" + this.comboBox1.Text + "','" + this.comboBox2.Text + "','" + this.comboBox3.Text + " ') ;";

    SqlConnection con = new SqlConnection(ss);
    SqlCommand cmd = new SqlCommand(q2, con);
    SqlDataReader read;

    try
    {
        con.Open();
        read = cmd.ExecuteReader();
        MessageBox.Show("Welcome to our gym");

        while (read.Read()) { };
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

如何使用Visual Studio和C＃将数据插入数据库并将其保存到数据库中？

此代码将引发错误。 有人请给我建议解决错误。

图片描述

Answer 1

首先，请确保您的客户表不同列的数据类型。 然后，确定必须为组合框保存的数据类型。

您必须从组合框获取选定的值。 combobox1，combobox2，combobox3仅调整类名称

 System.Windows.Forms.ComboBox

除其他外，建议使用参数..这样：您可以按照以下示例操作

private void button1_Click(object sender, EventArgs e)
{
    using(SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=c:\users\abdul samad\documents\visual studio 2013\Projects\newpro\newpro\Database1.mdf;Integrated Security=True"))
    {
        try
        {

            using (var cmd = new SqlCommand("INSERT INTO registor (Name, FullName, Password, Email, Gander) VALUES (@Name,@Fullname,@Password,@Email, @Gander)"))
            {

                cmd.Connection = con;   
                cmd.Parameters.Add("@Name", txtfname.Text);
                cmd.Parameters.Add("@Fullname", txtfname.Text);
                cmd.Parameters.Add("@Password", txtpass.Text);
                cmd.Parameters.Add("@Email", txtemail.Text);
                cmd.Parameters.Add("@Gander", comboBox1.GetItemText(comboBox1.SelectedItem));

                con.Open()
                if(cmd.ExecuteNonQuery() > 0) 
                {
                   MessageBox.Show("Record inserted"); 
                }
                else
                {
                   MessageBox.Show("Record failed");
                }
            }
        }
        catch (Exception e)
        {
            MessageBox.Show("Error during insert: " + e.Message);
        }
    }
}

Answer 2

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e) 
            { 
                SqlCommand cmd = new SqlCommand("insert into customer (name,weight,height,add_class,gender,fees) values(@name,@weight,@height,@add_class,@gender,@fees)", con); 
                cmd.Parameters.AddWithValue("name", this.textBox1.Text); 
                if (con.State == ConnectionState.Closed) 
                con.Open(); 
                cmd.ExecuteNonQuery(); 
                con.Close(); 
            }

Answer 3

注释变得有点忙，所以这是您需要做的事情（包括参数化查询）：

具体来说，您不需要insert语句的读取器，因为它不会返回结果集。

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
    var sql = "insert into dbo.customer ...";
    using (var con = new SqlConnection(ss))
    {

        var cmd = new SqlCommand(sql , con);
        con.Open();
        cmd.ExecuteScalar();
        MessageBox.Show("Welcome to our gym");
    }
}

Answer 4

嗨，请检查客户表在健身房数据库中是否可用。 否则尝试此链接

Answer 5

我发现您的连接字符串声明错误

public string ss = "Data Source=D\\SQLEXPRESS;Initial Catalog=gym;Integrated Security=True";

需要像下面这样更新

public string ss = "Data Source=abc\\SQLEXPRESS;Initial Catalog=gym; user id=sa; Password=123456";

数据源将不是D，它应该是服务器名称。

在此处输入图片说明