【数据库】MySqlBulkLoader——批量导入

#region 批量操作

        /// <summary>
        ///使用MySqlDataAdapter批量更新数据
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="table">数据表</param>
        public static void BatchUpdate( DataTable table)
        {

            MySqlConnection connection = GetConnection;
            MySqlCommand command = connection.CreateCommand();
            command.CommandTimeout = CommandTimeOut;
            command.CommandType = CommandType.Text;
            MySqlDataAdapter adapter = new MySqlDataAdapter(command);
            MySqlCommandBuilder commandBulider = new MySqlCommandBuilder(adapter);
            commandBulider.ConflictOption = ConflictOption.OverwriteChanges;

            MySqlTransaction transaction = null;
            try
            {
                connection.Open();
                transaction = connection.BeginTransaction();
                //设置批量更新的每次处理条数
                adapter.UpdateBatchSize = BatchSize;
                //设置事物
                adapter.SelectCommand.Transaction = transaction;

                if (table.ExtendedProperties["SQL"] != null)
                {
                    adapter.SelectCommand.CommandText = table.ExtendedProperties["SQL"].ToString();
                }
                adapter.Update(table);
                transaction.Commit();/////提交事务
            }
            catch (MySqlException ex)
            {
                if (transaction != null) transaction.Rollback();
                throw ex;
            }
            finally
            {
                connection.Close();
                connection.Dispose();
            }
        }

        /// <summary>
        ///大批量数据插入,返回成功插入行数
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="table">数据表</param>
        /// <returns>返回成功插入行数</returns>
        public static int BulkInsert( DataTable table)
        {
            if (string.IsNullOrEmpty(table.TableName)) throw new Exception("请给DataTable的TableName属性附上表名称");
            if (table.Rows.Count == 0) return 0;
            int insertCount = 0;
            string tmpPath = Path.GetTempFileName();
            string csv = DataTableToCsv(table);
            File.WriteAllText(tmpPath, csv);
            using (MySqlConnection conn = GetConnection)
            {
                MySqlTransaction tran = null;
                try
                {
                    conn.Open();
                    tran = conn.BeginTransaction();
                    MySqlBulkLoader bulk = new MySqlBulkLoader(conn)
                    {
                        FieldTerminator = ",",
                        FieldQuotationCharacter = '"',
                        EscapeCharacter = '"',
                        LineTerminator = "\r\n",
                        FileName = tmpPath,
                        NumberOfLinesToSkip = 0,
                        TableName = table.TableName,
                    };
                    bulk.Columns.AddRange(table.Columns.Cast<DataColumn>().Select(colum => colum.ColumnName).ToList());
                    insertCount = bulk.Load();
                    tran.Commit();
                }
                catch (MySqlException ex)
                {
                    if (tran != null) tran.Rollback();
                    throw ex;
                }
            }
            File.Delete(tmpPath);
            return insertCount;
        }

        /// <summary>
        ///将DataTable转换为标准的CSV
        /// </summary>
        /// <param name="table">数据表</param>
        /// <returns>返回标准的CSV</returns>
        private static string DataTableToCsv(DataTable table)
        {
            //以半角逗号（即,）作分隔符，列为空也要表达其存在。
            //列内容如存在半角逗号（即,）则用半角引号（即""）将该字段值包含起来。
            //列内容如存在半角引号（即"）则应替换成半角双引号（""）转义，并用半角引号（即""）将该字段值包含起来。
            StringBuilder sb = new StringBuilder();
            DataColumn colum;
            foreach (DataRow row in table.Rows)
            {
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    colum = table.Columns[i];
                    if (i != 0) sb.Append(",");
                    if (colum.DataType == typeof(string) && row[colum].ToString().Contains(","))
                    {
                        sb.Append("\"" + row[colum].ToString().Replace("\"", "\"\"") + "\"");
                    }
                    else sb.Append(row[colum].ToString());
                }
                sb.AppendLine();
            }

            return sb.ToString();
        }

        #endregion 批量操作

导入自增型数据：
自增列重新生成：SqlBulkCopy bc = new SqlBulkCopy(conn)

自增列保留原值：SqlBulkCopy bc = new SqlBulkCopy(conn,SqlBulkCopyOptions.KeepIdentity)

using(SqlBulkCopy sbc = new SqlBulkCopy(conn,SqlBulkCopyOptions.KeepIdentity))
  {
      sbc.DestinationTableName = tableName;
      foreach (string col in colList)
      {
          sbc.ColumnMappings.Add(col, col);
      }
     sbc.BulkCopyTimeout = 0;
     sbc.WriteToServer(dt);
 }