将组合框项添加到数据库
本文关键字:数据库 添加 组合 | 更新日期: 2023-09-27 18:28:43
遇到了一点麻烦。我正在尝试将组合框项目添加到我的数据库中,但它不起作用。
法典:
string con = "Data Source=(localdb)''MSSQLLocalDB;Initial Catalog=Database;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
string connectionString = con;
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand("INSERT INTO JobRoles (Jobroles) VALUES (@jr)");
cmd.CommandType = CommandType.Text;
cmd.Connection = connection;
cmd.Parameters.AddWithValue("@jr", comboBox1.Items.ToString());
connection.Open();
try
{
cmd.ExecuteNonQuery();
}
catch (Exception)
{
MessageBox.Show("Datebase error. Please contact software engineer.", "Error 303");
return;
}
我正在尝试在我的数据库中为每个组合框项目创建一个新行,但所有组合框项目都出现在一个单元格中,这将给我这个:
System.Windows.Forms.ComboBox+ObjectCollection
是否可以将组合框项添加到我的数据库中,并使用每个组合框项在数据库中创建新行?谢谢!很抱歉有任何困惑。
不应在一个命令中添加整个项目。相反,您应该使用 foreach
循环并逐个添加 oitems。
string con = "Data Source=(localdb)''MSSQLLocalDB;Initial Catalog=Database;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
string connectionString = con;
foreach (var item in comboBox1.Items) //loop to go through the items one by one
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand("INSERT INTO JobRoles (Jobroles) VALUES (@jr)");
cmd.CommandType = CommandType.Text;
cmd.Connection = connection;
cmd.Parameters.AddWithValue("@jr", item.ToString()); //Add each item to database separately
connection.Open();
try
{
cmd.ExecuteNonQuery();
}
catch (Exception)
{
MessageBox.Show("Datebase error. Please contact software engineer.", "Error 303");
return;
}
}
}