sql笨办法同步数据

Helpers.SqlHelper sqlHelper = new Helpers.SqlHelper("server=***;database=Cms;user id=sa;password=123");

            string[] tableNames = { "A", "B", "C", "D", "E" };
            var sb = new StringBuilder();
            foreach (var tableName in tableNames)
            {
                var dt = sqlHelper.ExecuteDataTable("select * from "+tableName+" where 0=0");
                
                sb.AppendLine("set identity_insert "+tableName+" on");
                sb.AppendLine("truncate table  " + tableName + " ");
                if (dt != null)
                {
                    var val = string.Empty;

                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        if (i%1000 == 0)
                        {
                            sb.AppendLine("insert into [" + tableName + "](");
                            for (int r = 0; r< dt.Columns.Count; r++)
                            {
                                if (r > 0)
                                    sb.Append(",");
                                sb.Append(dt.Columns[r].ColumnName);
                            }
                            sb.Append(")");
                            sb.AppendLine("values");
                        }
                        else
                            sb.AppendLine(",");

                        sb.Append("(");
                        for (int j = 0; j < dt.Columns.Count; j++)
                        {
                            if (j > 0)
                                sb.Append(",");

                            val = dt.Rows[i][j].ToString();
                            if (dt.Columns[j].DataType == typeof (DateTime) || dt.Columns[j].DataType == typeof (int) ||
                                dt.Columns[j].DataType == typeof (long))
                            {
                                if (string.IsNullOrEmpty(val))
                                {
                                    sb.Append("null");
                                }
                                else
                                {
                                    sb.Append("'" + val + "'");
                                }
                            }
                            else
                            {
                                sb.Append("'" + val.Replace("'", "''") + "'");
                            }
                        }
                        sb.Append(")");
                    }
                }
                sb.AppendLine();
                sb.AppendLine("set identity_insert " + tableName + " off");
                sb.AppendLine();
            }
            var sql = sb.ToString();

            Console.Write(sql);
            Console.Read();

identity表导入失败,所以就用了这种笨办法来同步数据