C#访问数据库问题

Question

private void button1_Click(object sender, EventArgs e)
{
    try
    {
        OleDbCommand cmd = new OleDbCommand();
        cmd.CommandType = CommandType.Text;       
        System.Data.OleDb.OleDbConnection con = new System.Data.OleDb.OleDbConnection();
        con.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\dhelm.ALLMATINC.001\Desktop\Db11.accdb";
        cmd.CommandText = @"insert into Table1 (Customer,Description,Color,Status,)VALUES('" + tBox3.Text + "','" + tBox1.Text + "','" + tBox12.Text + "','" + cBox2.Text + "')";
        cmd.Connection = con;
        con.Open();
        cmd.ExecuteNonQuery();
        System.Windows.Forms.MessageBox.Show("Recrod Succefully Created");
        con.Close();
    }
    catch(Exception ex)
    { MessageBox.Show("error " + ex); }


}

现在我的数据库有其他字段的主键是 ID，它有诸如 sqft rons peices 之类的东西。我不需要全部填写，对吗？我每次都会出错 INSERT INTO 语句中的语法错误 [![在此处输入图片描述][1]][1]

Answer 1

您的 SQL 似乎拼错了。正确示例：

private void button1_Click(object sender, EventArgs e)
{
    try
    {
        OleDbCommand cmd = new OleDbCommand();
        cmd.CommandType = CommandType.Text;       
        System.Data.OleDb.OleDbConnection con = new System.Data.OleDb.OleDbConnection();
        con.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\dhelm.ALLMATINC.001\Desktop\Db11.accdb";
        cmd.CommandText = @"insert into Table1 (Customer,Description,Color,Status) VALUES('" + tBox3.Text + "','" + tBox1.Text + "','" + tBox12.Text + "','" + cBox2.Text + "')";
        cmd.Connection = con;
        con.Open();
        cmd.ExecuteNonQuery();
        System.Windows.Forms.MessageBox.Show("Recrod Succefully Created");
        con.Close();
    }
    catch(Exception ex)
    { 
        MessageBox.Show("error " + ex); 
    }
}

Answer 2

您无需在 INSERT 语句中提供所有列的值。如果字段设置为自动递增或允许 NULL 值，则可以省略这些字段。在您的情况下，我认为您应该将主键 ID 设置为自动递增，其他字段允许 NULL 值。

Answer 3

您在 "Status" 字段后多了一个“,”。您不应将值直接附加到命令，而应使用参数化值。您也可以使用 "using" -statements 自动关闭和处理连接和命令。下面是可以帮助您解决问题的小代码：

using (var con = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\dhelm.ALLMATINC.001\Desktop\Db11.accdb"))
{
    using (var cmd = new OleDbCommand(@"
        INSERT INTO 
            Table1(Customer,Description,Color,Status)
            VALUES(@Customer,@Description,@Color,@Status)
    ", con))
    {
        cmd.Parameters.Add(new OleDbParameter("@Customer", OleDbType.VarChar)).Value = tBox3.Text;
        cmd.Parameters.Add(new OleDbParameter("@Description", OleDbType.VarChar)).Value = tBox1.Text;
        cmd.Parameters.Add(new OleDbParameter("@Color", OleDbType.VarChar)).Value = tBox12.Text;
        cmd.Parameters.Add(new OleDbParameter("@Status", OleDbType.VarChar)).Value = cBox2.Text;

        con.Open();

        cmd.ExecuteNonQuery();

        System.Windows.Forms.MessageBox.Show("Recrod Succefully Created");
    }
}

C#访问数据库问题

C# access database issue

c#

database

database-connection