将数据发送到 Access 数据库时出错

Question

当我尝试将我的代码发送到 Access 数据库时出现此异常：

System.Data.OleDb.OleDbException (0x80040E07): data type mismatch in a selection condition expression

at System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(OleDbHResult hr)
at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult)
at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
at System.Data.OleDb.OleDbCommand.ExecuteNonQuery()
at KPIZ.Form2.btn_save_Click(Object sender, EventArgs e) in C:\Users\booku\source\repos\KPIZ\KPIZ\Form2.cs:line 110

我的代码：

private void btn_save_Click(object sender, EventArgs e)
{
        try
        {
            byte[] imageBt = null;
            FileStream fstream = new FileStream(this.textBox2.Text, FileMode.Open, FileAccess.Read);
            BinaryReader br = new BinaryReader(fstream);
            imageBt = br.ReadBytes((int)fstream.Length);

            connection.Open();

            OleDbCommand command = new OleDbCommand();
            command.Connection = connection;
            command.CommandText = @"INSERT INTO [SportInfo]([ID],[FirstName],[LastName],[DOB],[Sport],[DIW],[Image])" + "VALUES(@id, @Fn, @Ln, @Date, @Sports, @days ,@IMG)";
            
            command.Parameters.Add(new OleDbParameter("@Fn", Convert.ToString(txt_fname.Text)));
            command.Parameters.Add(new OleDbParameter("@Ln", Convert.ToString(txt_lname.Text)));
            command.Parameters.Add(new OleDbParameter("@Date", Convert.ToString(mtxt_dob.Text)));
            command.Parameters.Add(new OleDbParameter("@Sports", Convert.ToString(txt_sport.Text)));
            command.Parameters.Add(new OleDbParameter("@days", Convert.ToInt32(nmc_diw.Text)));
            command.Parameters.Add(new OleDbParameter("@id", Convert.ToInt32(txt_id.Text)));
            command.Parameters.Add(new OleDbParameter("@IMG", imageBt));

            command.ExecuteNonQuery();

            MessageBox.Show("Data Saved");
            connection.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show("Unlucky  " + ex);
            connection.Close();
        }

        try
        {
            connection.Open();
            OleDbCommand command = new OleDbCommand();
            command.Connection = connection;
            string query = "select ID,LastName,FirstName,DOB,Sport,DIW, from SportInfo ";
            command.CommandText = query;

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

            connection.Close();
        }
}

Answer 1

OLEDB 参数始终是位置性的。这意味着查询中参数的顺序需要与代码中添加参数的顺序相匹配。

此外，您需要将日期参数添加为日期，而不是字符串。

调整您的参数顺序以匹配：

        command.Parameters.Add(new OleDbParameter("@id", Convert.ToInt32(txt_id.Text)));
        command.Parameters.Add(new OleDbParameter("@Fn", Convert.ToString(txt_fname.Text)));
        command.Parameters.Add(new OleDbParameter("@Ln", Convert.ToString(txt_lname.Text)));
        command.Parameters.Add(new OleDbParameter("@Date", DateTime.Parse(mtxt_dob.Text)));
        command.Parameters.Add(new OleDbParameter("@Sports", Convert.ToString(txt_sport.Text)));
        command.Parameters.Add(new OleDbParameter("@days", Convert.ToInt32(nmc_diw.Text)));
        command.Parameters.Add(new OleDbParameter("@IMG", imageBt));

如果顺序不匹配，则会出现很多错误，因为现在您正试图在日期列或整数列中插入文本字段。

将数据发送到 Access 数据库时出错

Error sending data to the Access Database

c#

sql

ms-access

oledb