C# 整数值不正确：'；System.Windows.Forms.Textbox，文本：1'；对于列'；客户id'；在第一排

我不知道为什么会出现这个错误。我以前确实插入了整数值。在Form1中，我在前面的表单中插入了字符串和int值

        string customer_id = variables.cid;
        customerID_txt.Text = customer_id;

        string constring2 = "datasource=localhost;port=3306;username=root;password=root";
        string Query2 = "insert into artgallery.orders(customer_id,painting_id) values ('" + this.customerID_txt + "','" + this.pID_txt.Text + "');";
        MySqlConnection conDatabase2 = new MySqlConnection(constring2);

---

并且

变量。cid

是一个字符串。

尝试从值中删除引号：

string customer_id = variables.cid;
customerID_txt.Text = customer_id;

string constring2 = "datasource=localhost;port=3306;username=root;password=root";
string Query2 = "insert into artgallery.orders(customer_id,painting_id) values (" + this.customerID_txt + ",'" + this.pID_txt.Text + "');";
MySqlConnection conDatabase2 = new MySqlConnection(constring2);

如果

this.customer\u id

是一个文本框，您需要将其更改为

this.customer\u id.text

，就像您使用

this.pID\u txt.text
一样：（注意
.text
并删除引号）

此外，您可能希望确保这些是整数，这样就没有人可以将代码注入数据库：

string customer_id = variables.cid;
customerID_txt.Text = customer_id;

string constring2 = "datasource=localhost;port=3306;username=root;password=root";
string Query2 = "insert into artgallery.orders(customer_id,painting_id) values (" + int.Parse(this.customerID_txt.Text) + "," + int.Parse(this.pID_txt.Text) + ");";
MySqlConnection conDatabase2 = new MySqlConnection(constring2);

删除单引号并使用
customer\u id
或
customerID\u txt.Text
而不是
customerID\u txt
，因为它是一个组件。请尝试以下代码：

string customer_id = variables.cid;
customerID_txt.Text = customer_id;

string constring2 = "datasource=localhost;port=3306;username=root;password=root";
string Query2 = "insert into artgallery.orders(customer_id,painting_id) values (" + customer_id + ",'" + this.pID_txt.Text + "');";
MySqlConnection conDatabase2 = new MySqlConnection(constring2);

您的代码：

string Query2 = "insert into artgallery.orders(customer_id,painting_id) values ('" + this.customerID_txt + "','" + this.pID_txt.Text + "');";

创建以下sql：

insert into artgallery.orders(customer_id,painting_id) values ('xxx','yyy');

该SQL表示您正在尝试插入两个字符串。删除引号，您就可以开始了（假设该值确实是一个整数，等等）。如前所述，您希望执行参数化SQL以避免SQL注入攻击。
正如其他人所指出的，强烈建议使用参数化查询。

代码应位于的行上（假设两个参数均为int）：

您的表列customer\u id、painting\u id是INT或varchar？看起来您是将customer\u id作为字符串而不是整数传递的。请使用参数化查询来避免此特定问题和一般答案。customer\u id和painting\u id在我的orders表中都是INT。但是如何将其作为INT传递？如何将customerID_txt.Text转换为int？。。。希望熟悉MySQL的人能够提供适当的参数化查询作为答案，而不是解决您遇到的字符串连接问题。
insert into artgallery.orders(customer_id,painting_id) values ('xxx','yyy');

string customer_id = variables.cid;
customerID_txt.Text = customer_id;
string constring2 = "datasource=localhost;port=3306;username=root;password=root";

using (MySqlConnection connection = new MySqlConnection(constring2))
{
    string query = "insert into artgallery.orders(customer_id, painting_id) values (@cutsomerId, @paintingId);";

    MySqlCommand command = new MySqlCommand(query, connection);

    command.Parameters.Add(new MySqlParameter("customerId", int.Parse(this.customerID_txt.Text)));
    command.Parameters.Add(new MySqlParameter("paintingId", int.Parse(this.pID_txt.Text)));

    command.Connection.Open();
    command.ExecuteNonQuery();
}