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C＃Windowsアプリケーションのgridviewを使用してデータベースに値を挿入しようとしています。私は2つの異なる方法を試みたが、どちらも私のために働いているようだ。 2つのタイプのコードは以下に示されています......グリッドビューからデータを挿入するときの 'NULL'とキー制約の処理
以下のコードが動作しても、私は主キーと外部キーの制約に関してさまざまなエラーが発生しています...... 。
問題：
私が先
businesslogicテーブル内のNULL可能で整数としてconfactorIDとmacroID列を持っている.......私はからこれらの列に「NULL」を挿入するかどうかはわかりませんC＃gridviewツール.......
が、私はこれらの問題を解決するために、私の次のコードに変更すること何が必要なのか、私は、入力として整数値を与えた場合でも、外部キーと主キー（重複）制約の問題があるようです。.. ..私は8時間以上これらの問題に立ち往生してきました...どんな助けも大歓迎です。
コードタイプ1：
private void ADD_button_Click(object sender, EventArgs e)
{
try
{
using (SqlConnection con = new SqlConnection(sqlconn))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.Connection = con;
con.Open();
for (int i = 1; i < dataGridView.Rows.Count; i++)
{
string sql = @"INSERT INTO " + schemaName +"ERSBusinessLogic VALUES ("
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_ID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_Formula"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputsCount"].Value + ",'"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_Inputs"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_DataSeries"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputTimeDimensionValue"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputTimeDimensionType"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_GeographyDimensionID"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputsUnitsIDs"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_Type"].Value + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_PrivacyID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_LongDesc"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_InputSources"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputName"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputUnitID"].Value + ", '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputDestination"].Value.ToString() + "', '"
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputTimeDimensionValue"].Value.ToString() + "', "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_OutputTimeDimensionType"].Value + ", "
+ dataGridView.Rows[i].Cells["ERSBusinessLogic_GroupID"].Value + ");";
if ((dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value == " ") && (dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value == null))
{
Convert.ToInt32(dataGridView.Rows[i].Cells["ERSBusinessLogic_ConvFactorID"].Value = "NULL");
Convert.ToInt32 (dataGridView.Rows[i].Cells["ERSBusinessLogic_MacroID"].Value = "NULL");
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
}
else
{
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
}
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Error : " + ex.Message);
}
finally
{
con.Close();
}
}
コードタイプ2：
private void ADD_button_Click(object sender, EventArgs e)
{
// Getting data from DataGridView
DataTable myDt = new DataTable();
myDt = GetDTfromDGV(dataGridView);
// Writing to sql
WriteToSQL(myDt);
}
private DataTable GetDTfromDGV(DataGridView dgv)
{
// Making our DataTable
DataTable dt = new DataTable();
foreach (DataGridViewColumn column in dgv.Columns)
{
dt.Columns.Add(column.Name, typeof(string));
}
// Getting data
foreach (DataGridViewRow dgvRow in dgv.Rows)
{
DataRow dr = dt.NewRow();
for (int col = 0; col < dgv.Columns.Count; col++)
{
dr[col] = dgvRow.Cells[col].Value;
}
dt.Rows.Add(dr);
}
// removing empty rows
for (int row = dt.Rows.Count - 1; row >= 0; row--)
{
bool flag = true;
for (int col = 0; col < dt.Columns.Count; col++)
{
if (dt.Rows[row][col] != DBNull.Value)
{
flag = false;
break;
}
}
if (flag == true)
{
dt.Rows.RemoveAt(row);
}
}
return dt;
}
private void WriteToSQL(DataTable dt)
{
using (SqlConnection con = new SqlConnection(sqlconn))
{
SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(con);
// Setting the database table name
sqlBulkCopy.DestinationTableName = "[AnimalProductsCoSD].[CoSD].[ERSBusinessLogic]";
// Mapping the DataTable columns with that of the database table
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[0].ColumnName, "ERSBusinessLogic_ID"));
Convert.ToString(sqlBulkCopy.ColumnMappings.Add(dt.Columns[1].ColumnName, "ERSBusinessLogic_Formula"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[2].ColumnName, "ERSBusinessLogic_InputsCount"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[3].ColumnName, "ERSBusinessLogic_Inputs"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[4].ColumnName, "ERSBusinessLogic_ConvFactorID"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[5].ColumnName, "ERSBusinessLogic_MacroID"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[6].ColumnName, "ERSBusinessLogic_DataSeries"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[7].ColumnName, "ERSBusinessLogic_InputTimeDimensionValue"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[8].ColumnName, "ERSBusinessLogic_InputTimeDimensionType"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[9].ColumnName, "ERSBusinessLogic_GeographyDimensionID"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[10].ColumnName, "ERSBusinessLogic_InputsUnitsIDs"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[11].ColumnName, "ERSBusinessLogic_Type"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[12].ColumnName, "ERSBusinessLogic_PrivacyID"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[13].ColumnName, "ERSBusinessLogic_LongDesc"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[14].ColumnName, "ERSBusinessLogic_InputSources"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[15].ColumnName, "ERSBusinessLogic_OutputName"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[16].ColumnName, "ERSBusinessLogic_OutputUnitID"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[17].ColumnName, "ERSBusinessLogic_OutputDestination"));
Convert.ToString (sqlBulkCopy.ColumnMappings.Add(dt.Columns[18].ColumnName, "ERSBusinessLogic_OutputTimeDimensionValue"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[19].ColumnName, "ERSBusinessLogic_OutputTimeDimensionType"));
Convert.ToInt32 (sqlBulkCopy.ColumnMappings.Add(dt.Columns[20].ColumnName, "ERSBusinessLogic_GroupID"));
con.Open();
sqlBulkCopy.WriteToServer(dt);
}
}
おかげ
