Question

这是我尝试使用C＃将数据添加到访问数据库中的地方。现在当我运行应用程序时，我得到一个错误，说Insert Into语句是错误的。我现在该怎么办？

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


namespace Santosh
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox3_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
                        if (textBox1.Text == "" && textBox2.Text == "" && textBox3.Text == "")
                MessageBox.Show("Plz Specify the UserName & Password","ERROR",MessageBoxButtons.OKCancel,MessageBoxIcon.Error);
            else if (textBox2.Text == "" && textBox3.Text == "")
                MessageBox.Show("Plz Specify the Password", "ERROR", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
            else if (textBox3.Text == "")
                MessageBox.Show("Plz RE Enter the Password", "ERROR", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
            else
            {
                string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\leelakrishnan\Desktop\database1.accdb";
               String uname, pass;
               string id;
               id =  textBox1.Text;
                uname = textBox2.Text;
                //System.Windows.Forms.MessageBox.Show(uname);
                pass = textBox3.Text; 
                OleDbConnection myConnection = new OleDbConnection(connectionString);
                myConnection.Open();
                int i=107;
                string query = @"insert into EMPLOYEE_TABLE (ID,UserName,Password) VALUES ('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "')";

                //string query = "insert into LOGIN_TABLE (ID,UserName,Password) VALUES (i,'uname',' pass')";
                i++;

                OleDbCommand myCommand = myConnection.CreateCommand();// new OleDbCommand();
                myCommand.CommandText = query;

                //TODO: Review the datatypes and lengths for these parameters
                OleDbParameter myParm = myCommand.Parameters.Add("@id", OleDbType.VarChar,50);
                myParm.Value = textBox1.Text;

                myParm = myCommand.Parameters.Add("@uname", OleDbType.VarChar, 50);
                myParm.Value = textBox2.Text;

                myParm = myCommand.Parameters.Add("@pass", OleDbType.VarChar, 50);
                myParm.Value = textBox3.Text;


                myCommand.ExecuteNonQuery();
                myConnection.Close();


                System.Windows.Forms.MessageBox.Show("User Account Succefully Created", "Caption", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);

            }
        }
    }
}

Answer 1

看到你已经参数化了你的命令（干得好！），接下来你应该开始编写参数化查询：

string query = @"insert into EMPLOYEE_TABLE (ID,UserName,Password) VALUES (@id, @uname, @pass)";

Answer 2

看起来你的字符串中有一些无关的引号。当你使用参数时，根本没有理由在字符串中引用引号 - 在这样的情况下绝对需要参数，因为有一天你会聘请一些爱尔兰人。（非参数化版本将在O'Neill先生身上崩溃并烧毁。）

使用调试器并查看ExecuteNonQuery（）之前的命令文本。

Answer 3

看起来你正试图将variables传递给命令，但是你没有在sql语句中声明它们。

尝试这样做：

string query = @"insert into EMPLOYEE_TABLE (ID,UserName,Password) VALUES (@id, @uname, @pass)";

Answer 4

看到你已经参数化了你的命令（干得好！），接下来你应该开始编写参数化查询：

string query = @“insert into EMPLOYEE_TABLE（ID，UserName，Password）VALUES（'@ id'，'@ uname'，'@ pass'）”;确保使用Apstrophe的

来填充VARCHAR值

如何将数据输入数据库？

4 个答案: