ms access 数据库中标准表达式异常中的数据类型不匹配

Question

我正在创建一个简单的程序，现在的想法是通过我的 C# 程序将数据 "Person information Name, Age ETC. " 插入数据库，当我单击按钮时出现此错误

System.Data.OleDb.OleDbException (0x80040E07): Data type mismatch in criteria 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 School_System.newRegisteration.button1_Click(Object sender, EventArgs e) in C:\Users\OmarS_000\documents\visual studio 2015\Projects\School System\School System\newRegisteration.cs:line 35

这是我的代码

   using System;
   using System.Collections.Generic;
   using System.ComponentModel;
   using System.Data;
   using System.Drawing;
   using System.Linq;
   using System.Text;
   using System.Threading.Tasks;
   using System.Windows.Forms;
   using System.Data.OleDb;
   using System.ComponentModel;


  public partial class newRegisteration : Form

               {
            private OleDbConnection connection = new OleDbConnection();
            public newRegisteration()
            {
                InitializeComponent();
                connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\OmarS_000\Documents\Visual Studio 2015\Projects\School System\School System\School.accdb;
    Persist Security Info=False;";
            }

            private void button1_Click(object sender, EventArgs e)
            {
                try
                {
                    connection.Open();
                    OleDbCommand command = new OleDbCommand();
                    command.Connection = connection;
                    command.CommandText = "INSERT into School ([Name], [Age], [Grade], [Class]) VALUES('" + nameTextBox2 + "', '" + ageTextBox2 + "', '" + gradeTextBox2 + "', '" + classTextBox2 + "') ";

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

错误提到的第35行包含

command.ExecuteNonQuery();

我在单击按钮时收到此错误，但 visual studio 中的代码调试完美且错误为 0。那么我在这里错过了什么地方？

Answer 1

您正在使用来自某个文本框的值，因此您需要使用它的 Text 属性来获取值

command.CommandText = "INSERT into School ([Name], [Age], [Grade], [Class]) VALUES('" + nameTextBox2.Text + "', '" + ageTextBox2.Text + "', '" + gradeTextBox2.Text + "', '" + classTextBox2.Text + "') ";

ms access 数据库中标准表达式异常中的数据类型不匹配

Data type mismatch in criteria expression exception in ms acess database

c#

oledb

ms-access

visual-studio