使用 MS Access 的 C# 标准表达式中的数据类型不匹配？

Question

您好，我尝试将表单中的数据保存到 MS Access 数据库。有 13 个字段要保存，但是当我单击此行上显示的保存按钮时出现错误 top.ExecuteNonQuery(); Data type mismatch in criteria expression。

这是我的代码，尽可能帮助我

 OleDbConnection conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:/Srihari/Srihari/Invoice.accdb");
        conn.Open();

        // to save top column in invoive
        int invoicenumber = Convert.ToInt32(TXE_Invoice_Number.Text);
        string terms = CBL_Terms.Text;
        DateTime date = CBL_Date.DateTime;
        string ourquote = TXE_OurQuote.Text;
        string salesperson = CBL_Sales_Person.Text;
        string customername = CBL_Customer_Nmae.Text;
        string oderno = CBL_Order_Number.Text;
        string invoiceaddress = TXE_Invoice_Address.Text;
        string deliveryaddress = TXE_Delivery_Address.Text;

        bool inclusive = CBX_New.Checked;

        decimal Price = Convert.ToDecimal(TXE_Price.Text);
        decimal tax = Convert.ToDecimal(TXE_Tax.Text);
        decimal grandtotal = Convert.ToDecimal(TXE_Total.Text);

        OleDbCommand top = new OleDbCommand("INSERT INTO test_top(InvoiceNumber,Terms,[InvoiceDate],OurQuote,SalesPerson,CustomerName,OrderNumber,InvoiceAddress,DeliveryAddress,InclusiveStatus,Price,Tax,GrandTotal) VALUES (" + invoicenumber + ",'" + terms + "','" + date + "','" + ourquote + "','" + salesperson + "','" + customername + "','" + oderno + "','" + invoiceaddress + "','" + deliveryaddress + "','" + inclusive + "','" + Price + "','" + tax + "','" + grandtotal + "')", conn);
        top.ExecuteNonQuery();
        MessageBox.Show("Inserted Successful (top)", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);

conn.close();

在 Access 数据库中 13 列 InvoiceNumber 编号、条款文本、InvoiceDate 日期/时间、OurQuote 文本、SalesPerson 文本、CustomerName 文本、Orderno 文本、InvoiceAddress 备注、DeliveryAddress 备注、InclusiveStatus Yes/No、Price Decimal、Tax Decimal、GrandTotal Decimal .

我的代码出了什么问题？

Answer 1

说真的，通过使用参数查询，省去你的麻烦，同时编写更可靠的代码：

OleDbCommand top = new OleDbCommand(
        "INSERT INTO test_top (" +
                "InvoiceNumber,Terms,[InvoiceDate],OurQuote," +
                "SalesPerson,CustomerName,OrderNumber," +
                "InvoiceAddress,DeliveryAddress,InclusiveStatus," +
                "Price,Tax,GrandTotal" +
            ") VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?)", conn);
top.Parameters.AddWithValue("?", invoicenumber);
top.Parameters.AddWithValue("?", terms);
top.Parameters.AddWithValue("?", date);
top.Parameters.AddWithValue("?", ourquote);
top.Parameters.AddWithValue("?", salesperson);
top.Parameters.AddWithValue("?", customername);
top.Parameters.AddWithValue("?", oderno);
top.Parameters.AddWithValue("?", invoiceaddress);
top.Parameters.AddWithValue("?", deliveryaddress);
top.Parameters.AddWithValue("?", inclusive);
top.Parameters.AddWithValue("?", Price);
top.Parameters.AddWithValue("?", tax);
top.Parameters.AddWithValue("?", grandtotal);
top.ExecuteNonQuery();

Answer 2

我认为您在保存到 Access Database 时应该知道的几点

1) String 应在 single Quotes 范围内

2) Numeric 值应该不在引号内

3) DateTime 值应使用 #

保存