在插入之前检查 DataGridview 中的值是否与数据库表/模式兼容
[英]Check if values in DataGridview are compatible with database table/schema BEFORE Inserting
问题描述
I have a DatagridView which gets values from excel files.
我有一个 DatagridView，它从 excel 文件中获取值。 After the values are shown in the datagridview, the user can add/alter them and when the user presses save, my code inserts the table to my database.在 datagridview 中显示值后，用户可以添加/更改它们，当用户按下保存时，我的代码会将表插入到我的数据库中。 I have surrounded my code with try catch so it stops when there is an error because of the values but when the user corrects the data and presses save again, the first rows that have been inserted are inserted again to the database.我用 try catch 包围了我的代码，因此当由于值而出现错误时它会停止，但是当用户更正数据并再次按下保存时，已插入的第一行将再次插入到数据库中。 My question is, how can i write a code so it doesn't duplicate the rows that it has inserted already?我的问题是，我如何编写代码，使其不会重复已插入的行？ Thank you in advance.先感谢您。 My code that inserts is down below.我插入的代码在下面。
try
{
for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
{
OleDbCommand cmd = new OleDbCommand(commandText, cnn);
Guid g = Guid.NewGuid();
//veritabanına verileri atıyoruz
cmd.Parameters.AddWithValue("@guidkodu", g);
cmd.Parameters.AddWithValue("@faturatarihi", belgetarihigetir((dataGridView1.Rows[i].Cells[0].Value.ToString()))); //datetime a cast ediliyor
cmd.Parameters.AddWithValue("@faturano", (dataGridView1.Rows[i].Cells[1].Value).ToString());
cmd.Parameters.AddWithValue("@vkntckn", (dataGridView1.Rows[i].Cells[2].Value).ToString());
cmd.Parameters.AddWithValue("@tur", (dataGridView1.Rows[i].Cells[3].Value).ToString());
//kdv değerleri yoksa veritabanına null,varsa değerini atıyoruz
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[4].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv0matrahi", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv0matrahi", ToNullableFloat((dataGridView1.Rows[i].Cells[4].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[5].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv1matrahi", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv1matrahi", ToNullableFloat((dataGridView1.Rows[i].Cells[5].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[6].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv1tutar", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv1tutar", ToNullableFloat((dataGridView1.Rows[i].Cells[6].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[7].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv8matrah", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv8matrah", ToNullableFloat((dataGridView1.Rows[i].Cells[7].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[8].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv8tutar", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv8tutar", ToNullableFloat((dataGridView1.Rows[i].Cells[8].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[9].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv18matrah", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv18matrah", ToNullableFloat((dataGridView1.Rows[i].Cells[9].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[10].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv18tutar", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv18tutar", ToNullableFloat((dataGridView1.Rows[i].Cells[10].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[11].Value).ToString()))
{
cmd.Parameters.AddWithValue("@oiv", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@oiv", ToNullableFloat((dataGridView1.Rows[i].Cells[11].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[12].Value).ToString()))
{
cmd.Parameters.AddWithValue("@faturatutari", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@faturatutari", ToNullableFloat((dataGridView1.Rows[i].Cells[12].Value).ToString()));
}
//cmd.Parameters.AddWithValue("@islemtarihi", zaman);
cmd.ExecuteNonQuery();
}
MessageBox.Show("Veriler Kaydedildi");
this.Hide();
//GirisFormu a = new GirisFormu();
// a.ShowDialog();
}
catch (Exception)
{
MessageBox.Show("bir hata oluştu, tekrar deneyiniz");
}
1 个解决方案
解决方案1
0 2020-03-06 07:04:34
Declare a static variable count in your class and initialize it to 0在类中声明一个静态变量计数并将其初始化为 0
static int count=0;
Comments and changes highlighted by ***注释和更改以 *** 突出显示
try
{
for (int i = count; i < dataGridView1.Rows.Count - 1; i++)//***start the for loop by count***
{
OleDbCommand cmd = new OleDbCommand(commandText, cnn);
Guid g = Guid.NewGuid();
//veritabanına verileri atıyoruz
cmd.Parameters.AddWithValue("@guidkodu", g);
cmd.Parameters.AddWithValue("@faturatarihi", belgetarihigetir((dataGridView1.Rows[i].Cells[0].Value.ToString()))); //datetime a cast ediliyor
cmd.Parameters.AddWithValue("@faturano", (dataGridView1.Rows[i].Cells[1].Value).ToString());
cmd.Parameters.AddWithValue("@vkntckn", (dataGridView1.Rows[i].Cells[2].Value).ToString());
cmd.Parameters.AddWithValue("@tur", (dataGridView1.Rows[i].Cells[3].Value).ToString());
//kdv değerleri yoksa veritabanına null,varsa değerini atıyoruz
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[4].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv0matrahi", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv0matrahi", ToNullableFloat((dataGridView1.Rows[i].Cells[4].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[5].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv1matrahi", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv1matrahi", ToNullableFloat((dataGridView1.Rows[i].Cells[5].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[6].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv1tutar", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv1tutar", ToNullableFloat((dataGridView1.Rows[i].Cells[6].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[7].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv8matrah", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv8matrah", ToNullableFloat((dataGridView1.Rows[i].Cells[7].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[8].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv8tutar", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv8tutar", ToNullableFloat((dataGridView1.Rows[i].Cells[8].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[9].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv18matrah", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv18matrah", ToNullableFloat((dataGridView1.Rows[i].Cells[9].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[10].Value).ToString()))
{
cmd.Parameters.AddWithValue("@kdv18tutar", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@kdv18tutar", ToNullableFloat((dataGridView1.Rows[i].Cells[10].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[11].Value).ToString()))
{
cmd.Parameters.AddWithValue("@oiv", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@oiv", ToNullableFloat((dataGridView1.Rows[i].Cells[11].Value).ToString()));
}
if (string.IsNullOrEmpty((dataGridView1.Rows[i].Cells[12].Value).ToString()))
{
cmd.Parameters.AddWithValue("@faturatutari", System.DBNull.Value);
}
else
{
cmd.Parameters.AddWithValue("@faturatutari", ToNullableFloat((dataGridView1.Rows[i].Cells[12].Value).ToString()));
}
//cmd.Parameters.AddWithValue("@islemtarihi", zaman);
cmd.ExecuteNonQuery();
count+=1;//***increment the count on every successful insert.***
}
MessageBox.Show("Veriler Kaydedildi");
this.Hide();
//GirisFormu a = new GirisFormu();
// a.ShowDialog();
}
catch (Exception)
{
MessageBox.Show("bir hata oluştu, tekrar deneyiniz");
}
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.
相关问题
在数据库上插入datagridview的值 - inserting the values of a datagridview on the database
在插入sql数据库之前检查现有记录 - check existing record before inserting sql database
在C＃中将datagridview中的值插入SQL Server数据库 - Inserting values from datagridview into SQL Server database in C#
从 dataGridView INTO 数据库表中插入列值 - INSERT column Values from dataGridView INTO database table
如何将在datagridview中输入的值插入数据库表？ - how to insert values entered in datagridview into database table?
将数据从datagridview插入数据库 - inserting data from datagridview to database
在将大量数据插入数据库之前，如何检查记录是否存在？ - How to check if a record exists before inserting a lot of data into a database?
插入值后刷新 DataGridView - Refresh DataGridView after inserting values
在插入数据库之前检查文本框中的空值 - Checking for null values on text box before inserting to database
在表中插入数据之前，是否可以获取Id（IDENTITY）的新值？ - Is is possible to get new values for Id (IDENTITY) before inserting data in a table?
相关标签