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[英]Implicit conversion from data type sql_variant to varbinary(max) is not allowed. Use the CONVERT function to run this query. ASP.NET SQL DataSource
[英]Error : Implicit conversion from data type varchar to varbinary(max) is not allowed. Use the CONVERT function to run this query
這是我上傳圖像的程序:
protected void Button1_Click(object sender, EventArgs e)
{
string car_model = TextBox1.Text;
string car_brand = TextBox2.Text;
string car_type = TextBox3.Text;
int dist_travel = int.Parse(TextBox4.Text);
int mileage = int.Parse(TextBox5.Text);
string car_condition = TextBox6.Text;
string car_owner = TextBox7.Text;
string car_color = TextBox8.Text;
int car_price = int.Parse(TextBox9.Text);
if (FileUpload1.HasFile)
{
byte[] fdata = FileUpload1.FileBytes;
string con_string = @"data source=(local);initial catalog=Automobile;integrated security=true";
SqlConnection con = new SqlConnection();
con.ConnectionString = con_string;
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = "Insert into vehicle_details values ('" + car_model + "','" + car_type + "','" + dist_travel + "','" + mileage + "','" + car_condition + "','" + car_owner + "','" + car_color + "','" + fdata + "','" + car_price + "')";
con.Open();
cmd.ExecuteNonQuery();
con.Close();
}
}
然后會引發以下錯誤:
不允許從數據類型
varchar
隱式轉換為varbinary(max)
。 使用CONVERT
函數運行此查詢。
數據庫的結構為car_model varchar,car_type varchar,dist_travel int,mileage int,car_condition varchar,car_owner varchar,car_color varchar,fdata varbinary(MAX),car_price varchar
您可能已經將fdata聲明為byte [],但是讀取的代碼部分
... + "','" + fdata + "','" + ....
將其強制為字符串,以便可以成為命令文本的一部分
您將必須參數化查詢
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