Question

我想将超过1000行的数据插入到SQL表中，因此我需要使用SqlBulkCopy。但是看起来我需要先创建一个DataTable。因此，如何将数据添加到DataTable？我想将字典中动态生成的数据添加到DataTable中。

var conn = new SqlConnection(masterData.DictRunData["ConnectionStringLocalDb"]);
const string objectName = "NotAvailable";
var dt = DateTime.Now;
var cmd = new SqlCommand("insert into CorporateDataStructure.dbo.ObjectInventory (location, object_name, object_id, object_xpath, time) values (@location, @object_name, @object_id, @object_xpath, @time)", conn);

foreach (var pair in webidsAndXPaths)
{
    conn.Open();
    cmd.Parameters.Clear();
    cmd.Parameters.Add(new SqlParameter("@object_name", objectName));
    cmd.Parameters.Add(new SqlParameter("@object_id", pair.Key));
    cmd.Parameters.Add(new SqlParameter("@object_xpath", pair.Value));
    cmd.Parameters.Add(new SqlParameter("@time", dt));

    cmd.ExecuteNonQuery();
    conn.Close();
}
return true;

Answer 1

将适当的列添加到DataTable，然后循环所有字典条目并添加行：

var table = new System.Data.DataTable();
table.Columns.Add("object_name", typeof(string));
table.Columns.Add("object_id", typeof(int));
table.Columns.Add("object_xpath", typeof(string));
table.Columns.Add("time", typeof(DateTime));

foreach (var pair in webidsAndXPaths)
{
    table.Rows.Add(objectName, pair.Key, pair.Value, dt);
}

您可以使用SetField使用这种更长但可读的方法而不是table.Rows.Add：

foreach (var pair in webidsAndXPaths)
{
    DataRow row = table.Rows.Add();
    row.SetField("object_name", objectName);
    row.SetField("object_id", pair.Key);
    row.SetField("object_xpath", pair.Value);
    row.SetField("time", dt);
}

最后，您需要使用SqlBulkCopy.WriteToServer：

using (SqlBulkCopy bulkCopy = new SqlBulkCopy(conn))
{
    conn.Open();
    bulkCopy.DestinationTableName = "dbo.ObjectInventory";
    bulkCopy.WriteToServer(table);
}

如果DataTable中的列顺序与数据库中的列相同，则无需映射列。

Answer 2

using (var bulkCopy = new SqlBulkCopy(conn, <SqlBulkCopyOptions>))
            {
                //dataTable definition
                var table = new System.Data.DataTable();
                table.Columns.Add("object_name", typeof(string));
                table.Columns.Add("object_id", typeof(int));
                table.Columns.Add("object_xpath", typeof(string));
                table.Columns.Add("time", typeof(DateTime));
                //bulkCopy options
                bulkCopy.BatchSize = webidsAndXPaths.Count();
                bulkCopy.DestinationTableName = "CorporateDataStructure.dbo.ObjectInventory";
                //bulkCopy mappings (not mandatory, just to avoid depending on column ordering in datatable)
                //That may avoid "strange" mistakes if you change something to your db or datatable.
                bulkCopy.ColumnMappings.Add("object_name", "object_name");
                bulkCopy.ColumnMappings.Add("object_id", "object_id");
                bulkCopy.ColumnMappings.Add("object_xpath", "object_xpath");
                bulkCopy.ColumnMappings.Add("time", "time");

                //dataTable fedding from dictionary
                foreach (var pair in webidsAndXPaths)
                {
                     table.Rows.Add(objectName, pair.Key, pair.Value, dt);
                }
                //write to db.
                bulkCopy.WriteToServer(table);
            }

如何创建数据表并传入信息？

2 个答案: