Question

我必须使用按钮，即Insert和View。问题是每次我按Insert以便将数据存入我的数据库时，必须按下按钮View才能查看存储在我的数据库中的数据并显示在dataGridView中

我想要的是每次按下Insert按钮，用户都不需要按View按钮。我不知道如何将View的代码插入Insert按钮。

这是我Insert的代码：

{
    con.Open();
    OleDbCommand cmd = con.CreateCommand();
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "insert into customerOrder values('"+txtFname.Text+"','"+txtLname.Text+"')";
    cmd.ExecuteNonQuery();
    con.Close();
    txtFname.Text = "";
    txtLname.Text = "";
    MessageBox.Show("Inserted Successfully!");

}

这是View的代码：

{
    con.Open();
    OleDbCommand cmd = con.CreateCommand();
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "select * from customerOrder";
    cmd.ExecuteNonQuery();

    DataTable dt = new DataTable();
    OleDbDataAdapter da = new OleDbDataAdapter(cmd);
    da.Fill(dt);
    dataGridView1.DataSource = dt;
    con.Close();

}

Answer 1

将它们封装在单独的方法中，如

public void InsertData()
{
    con.Open();
    OleDbCommand cmd = con.CreateCommand();
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "insert into customerOrder values('"+txtFname.Text+"','"+txtLname.Text+"')";
    cmd.ExecuteNonQuery();
    con.Close();
    txtFname.Text = "";
    txtLname.Text = "";
    MessageBox.Show("Inserted Successfully!");

}

Public void ViewData()
    {
        con.Open();
        OleDbCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "select * from customerOrder";
        cmd.ExecuteNonQuery();

        DataTable dt = new DataTable();
        OleDbDataAdapter da = new OleDbDataAdapter(cmd);
        da.Fill(dt);
        dataGridView1.DataSource = dt;
        con.Close();

    }

现在，在Insert事件处理程序中，将它们称为

protected void Insert_Click(object sender, EventArgs e)
{
  InsertData();
  ViewData();
}

Answer 2

如果您希望为视图事件调用Procdure，可以使用

private void cmd_Insert_Click(object sender, EventArgs e)
{
    /**Do insert here **//
    cmd_View_Click(sender, e);
}

private void cmd_View_Click(object sender, EventArgs e)
{
    /**Do View here **//
}

Answer 3

将每个代码放在单独的方法上，例如：

void Insert()
{
        con.Open();
        OleDbCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "insert into customerOrder values(@Fname,@Lname)";
        cmd.Parameters.Add("@Fname",SqlDbType.NVarchar).Value = txtFname.Text;
        cmd.Parameters.Add("@Lname",SqlDbType.NVarchar).Value = txtLname.Text;
        cmd.ExecuteNonQuery();
        con.Close();
        txtFname.Text = "";
        txtLname.Text = "";
        MessageBox.Show("Inserted Successfully!");    
 }

void View()
 {
        con.Open();
        OleDbCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "select * from customerOrder";
        cmd.ExecuteNonQuery();

        DataTable dt = new DataTable();
        OleDbDataAdapter da = new OleDbDataAdapter(cmd);
        da.Fill(dt);
        dataGridView1.DataSource = dt;
        con.Close();
    }

然后在“插入”按钮上单击“是”：

private void btnInsert_Click(object sender, EventArgs e)
{
    Insert();
    View();
}

另请注意在Insert Method上使用 SQL参数。使用它们而不是连接字符串

非常重要

Answer 4

您只需将View的代码插入 insertButton的代码即可。

        private void btnInsert_Click(object sender, EventArgs e)
        {
            con.Open();
            OleDbCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "insert into customerOrder values('" + txtFname.Text + "','" + txtLname.Text + "')";
            cmd.ExecuteNonQuery();
            con.Close();
            txtFname.Text = "";
            txtLname.Text = "";
            MessageBox.Show("Inserted Successfully!");
            FillGridView();
        }

        private void FillGridView()
        {
            con.Open();
            OleDbCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "select * from customerOrder";
            cmd.ExecuteNonQuery();

            DataTable dt = new DataTable();
            OleDbDataAdapter da = new OleDbDataAdapter(cmd);
            da.Fill(dt);
            dataGridView1.DataSource = dt;
        }

Answer 5

void InsertButton_Click(Object sender, EventArgs e)
{
    con.Open();
    OleDbCommand cmd = con.CreateCommand();
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "insert into customerOrder values('"+txtFname.Text+"','"+txtLname.Text+"')";
    cmd.ExecuteNonQuery();
    con.Close();
    txtFname.Text = "";
    txtLname.Text = "";
    MessageBox.Show("Inserted Successfully!");
    ViewButton_Click(sender, e)
}

void ViewButton_Click(Object sender, EventArgs e)
{
        con.Open();
        OleDbCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "select * from customerOrder";
        cmd.ExecuteNonQuery();
        DataTable dt = new DataTable();
        OleDbDataAdapter da = new OleDbDataAdapter(cmd);
        da.Fill(dt);
        dataGridView1.DataSource = dt;
        con.Close();
}

C＃查看插入的数据，无需任何按钮即可查看

5 个答案: