[英]Why my update with adapter doesn't work
On form close I call update but I got error message: update requires InsertCommand whereas I inspired from this tut http://www.switchonthecode.com/tutorials/csharp-tutorial-binding-a-datagridview-to-a-database在表单关闭时我调用更新但我收到错误消息:更新需要 InsertCommand 而我的灵感来自这个 tut http://www.switchonthecode.com/tutorials/csharp-tutorial-binding-a-datagridview-to-a-database
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace datatablemsaccess
{
partial class Form1
{
OleDbDataAdapter dataAdapter;
private string getSQL() {
string sql = "SELECT * from tPerson";
return sql;
}
private string getConnectionString() {
string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + @"App_Data\person.mdb";
return connectionString;
}
private DataTable getDataTable(string sql)
{
DataTable dataTable;
string connectionString = getConnectionString();
using (dataAdapter = new OleDbDataAdapter(sql, connectionString))
{
dataTable = new DataTable();
dataAdapter.Fill(dataTable);
}
return dataTable;
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data;
using System.Data.OleDb;
namespace datatablemsaccess
{
public partial class Form1 : Form
{
BindingSource bindingSource;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string sql = getSQL();
bindingSource = new BindingSource();
bindingSource.DataSource = getDataTable(sql);
dataGridView1.DataSource = bindingSource;
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
dataAdapter.Update((DataTable)bindingSource.DataSource);
}
}
}
You need to define an InsertCommand.您需要定义一个 InsertCommand。
See Update requires a valid InsertCommand when passed DataRow collection with new rows请参阅更新需要一个有效的 InsertCommand 时传递带有新行的 DataRow 集合
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