Question

try
        {
            string CSVFilePathName = textBox4.Text;
            for (int i = 0; i < CSVFilePathName.Length; i++)
            {
                if (CSVFilePathName[i] == '\\')
                {
                    CSVFilePathName.Insert(i + 1, "\\");
                }
            }
                if (string.IsNullOrWhiteSpace(textBox4.Text))
                {
                    MessageBox.Show("Please Select a File");
                }
                else
                {
                    int count = 0;
                    // your code here 
                    // string CSVFilePathName = @"'" + textBox4.Text + "'";
                    string[] Lines = File.ReadAllLines(CSVFilePathName);
                    string[] Fields;
                    Fields = Lines[0].Split(new char[] { ',' });
                    int Cols = Fields.GetLength(0);
                    DataTable dt = new DataTable();
                    for (int i = 1; i < Lines.GetLength(0); i++)
                    {
                        Fields = Lines[i].Split(new char[] { ',' });
                        for (int f = 0; f < Cols; f++)
                        {
                            q = "SELECT * from questions where main_section='" + Fields[0] + "' AND secondary_section='" + Fields[1] + "' AND tert_section='" + Fields[2] + "' AND question='" + Fields[3] + "' AND difficulty='" + Fields[4] + "'";
                            OleDbCommand cmdn = new OleDbCommand(q, conn);
                            //MessageBox.Show(q);
                            object obj = cmdn.ExecuteScalar();
                            if (obj == null)
                            {
                                q = "insert into questions values('" + Fields[0] + "','" + Fields[1] + "','" + Fields[2] + "','" + Fields[3] + "' ,'" + Fields[4] + "')";
                                OleDbCommand cmdn1 = new OleDbCommand(q, conn);
                                cmdn1.ExecuteNonQuery();
                            }
                            else 
                            {
                                count++;
                            }
                            //MessageBox.Show(Fields[f]);
                        }

                    }
                    //  dataGridClients.DataSource = dt;
                    string msg = "Upload successful\n";
                    if (count > 0)
                    {
                        msg=count.ToString()+" Questions missed due to their duplicates in the database.";
                    }
                    MessageBox.Show(msg);
                }

        }
       catch (Exception ex)
       {
           MessageBox.Show("Error is " + ex.ToString());
           throw;
       }

我正在使用c＃winform将csv文件上传到我的ms访问数据库，但是错误很明显＆＃34;该字段太小而无法接受您尝试添加的数据量。尝试插入或粘贴较少的数据。＆＃34;现在该怎么办？

Answer 1

我建议在SQL中指定表字段

INSERT INTO questions (fieldname1, fieldname2, ...) VALUES (...)

使用参数化值而不是直接在字符串中写入值。这也允许您指定数据类型，然后ADO.Net OLE适配器将有希望适当地处理它并插入长文本没有任何问题。转到Read / Write BLOBs ...以获取插入BLOBS的示例。概念和代码示例与插入长文本值非常相关。它演示了如何为查询设置参数。在您的情况下，请使用OleDbType.LongVarWChar作为长文本字段。

错误 - 该字段太小，无法接受您尝试添加的数据量。尝试插入或粘贴较少的数据

1 个答案: