5

我正在尝试使用 SQLBulkCopy 向 SQL Server 插入一个通用列表，

而且我在身份字段方面遇到了麻烦

我希望我的目标表生成身份字段我应该如何处理，这是我的代码

using (var bulkCopy = new SqlBulkCopy(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
                {
                    bulkCopy.BatchSize = (int)DetailLines;
                    bulkCopy.DestinationTableName = "dbo.tMyTable";

                    var table = new DataTable();
                    var props = TypeDescriptor.GetProperties(typeof(tBFFormularyStatusList))
                        //Dirty hack to make sure we only have system data types 
                        //i.e. filter out the relationships/collections
                                               .Cast<PropertyDescriptor>()
                                               .Where(propertyInfo => propertyInfo.PropertyType.Namespace.Equals("System"))
                                               .ToArray();
                    foreach (var propertyInfo in props)
                    {
                        bulkCopy.ColumnMappings.Add(propertyInfo.Name, propertyInfo.Name);
                        table.Columns.Add(propertyInfo.Name, Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType);
                    }

                    var values = new object[props.Length];
                    foreach (var item in myGenericList)
                    {
                        for (var i = 0; i < values.Length; i++)
                        {
                            values[i] = props[i].GetValue(item);
                        }

                        table.Rows.Add(values);
                    }

                    bulkCopy.WriteToServer(table);
                }

例外

Property accessor 'ID' on object 'ProcessFlatFiles.DetailsClass' threw the following exception:'Object does not match target type.'

我也试过

using (var bulkCopy = new SqlBulkCopy(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString, SqlBulkCopyOptions.KeepIdentity))
                {
4

2 回答 2

14

最后我得到了这个方法

    using (var bulkCopy = new SqlBulkCopy(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString, SqlBulkCopyOptions.KeepNulls & SqlBulkCopyOptions.KeepIdentity))
                {
                    bulkCopy.BatchSize = (int)DetailLines;
                    bulkCopy.DestinationTableName = "dbo.myTable";
                    bulkCopy.ColumnMappings.Clear();
                    bulkCopy.ColumnMappings.Add("SourceColumnName", "DestinationColumnName");
                    bulkCopy.ColumnMappings.Add("SourceColumnName", "DestinationColumnName");
                    bulkCopy.ColumnMappings.Add("SourceColumnName", "DestinationColumnName");
                    bulkCopy.ColumnMappings.Add("SourceColumnName", "DestinationColumnName");
                    .
                    .
                    .
                    .
                    bulkCopy.ColumnMappings.Add("SourceColumnName", "DestinationColumnName");

                    bulkCopy.WriteToServer(datatable);
                }
于 2012-06-19T16:14:12.413 回答
0

我知道这是一个老问题，但我认为值得添加这个替代方案：（如果您已经有正确的架构，可以跳过 1、2、3）

  1. 从表中执行简单的 TOP 1 选择以返回具有目标表架构的数据表
  2. 使用 DataTable 的Clone方法生成相同架构且无数据的数据表
  3. 将您的数据插入此表
  4. Perform SqlBulkCopy's WriteToServer (if column orders match, then the identity values can be read. If the option isn't provided in SqlBulkCopy's constructor then the default is to ignore these values and let the destination provide them).

The important point is that if you have the columns in the correct order (including identity columns), everything is handled for you.

于 2014-02-11T01:17:14.903 回答