我想从dataGridView1向MySql数据库添加新值。代码本身似乎是正确的,Visual Studio 2012中没有错误,但我的数据库中没有插入数据。 这是我正在使用的代码:
private void button2_Click(object sender, EventArgs e)
{
confirm exec = new confirm();
}
public class confirm
{
public void method(DataGridViewCellEventArgs f)
{
DataGridView dataGridView1 = new DataGridView();
Label label1 = new Label(); // contains User ID which is used for payer_code
Label label6 = new Label(); // contains current dayTime
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if ((bool)dataGridView1.Rows[f.RowIndex].Cells["paidDataGridViewTextBoxColumn"].Value == true)
{
try
{
string MyConnectionString = "Server=localhost; Database=contractsdb; Uid=root; Pwd=";
MySqlConnection connection = new MySqlConnection(MyConnectionString);
MySqlCommand cmd = new MySqlCommand();
cmd = connection.CreateCommand();
connection.Open();
cmd.CommandText = "INSERT INTO payments(pay_name, pay_code, payer_code, pay_sum, pay_date)VALUES(@pay_name, @pay_code, @payer_code, @pay_sum, @pay_date)";
cmd.Parameters.AddWithValue("@pay_name", dataGridView1.Rows[f.RowIndex].Cells["contractnameDataGridViewTextBoxColumn"].Value);
cmd.Parameters.AddWithValue("@pay_code", dataGridView1.Rows[f.RowIndex].Cells["contractcodeDataGridViewTextBoxColumn"].Value);
cmd.Parameters.AddWithValue("@payer_code", label1.Text);
cmd.Parameters.AddWithValue("@pay_sum", dataGridView1.Rows[f.RowIndex].Cells["sumDataGridViewTextBoxColumn"].Value);
cmd.Parameters.AddWithValue("@pay_date", label6.Text);
cmd.ExecuteNonQuery();
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
}
答案 0 :(得分:0)
我认为你误解了一些关于OOP的事情。这样做:
您的confirm
类方法也应该引用datagridview1
(您正在创建一个空的datagridview
,因此它永远不会进入foreach
循环)
public void method(DataGridView datagridview1) //remove your first argument, you don't need it anymore
{
//delete the line "DataGridView dataGridView1 = new DataGridView();"
//and keep the rest of the code as it is
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if(row.Cells["paidDataGridViewTextBoxColumn"].Value == true) //it will check every row, and you don't need "DataGridViewCellEventArgs" argument now
{
try
{
//your code, it will be same here
}
}
}
用于调用方法:
(使用与您相同的button_click事件)
private void button2_Click(object sender, EventArgs e)
{
confirm exec = new confirm();
exec.method(datagridview1); //pass "datagridview1" reference
}
它会将原始datagridview1
的引用传递给confirm
类。