flat-file

问题 There are few questions related to this topic on stackoverflow, But I didn't get the proper answer. I have some doubts on performance of flat files, Is it better to use flat files instead of SQLite ? Can anybody have performance statistics ? Or example of proper way to code flat file in android. 回答1: Aside from performance benefits, here's a simple list of advantages of using SQLite rather than flat file: You can query items as you wish -- don't need to load all of them and select which ones

问题 using SSIS 2012. My flat file connection manager I have a delimited file where the row delimiter is set to CRLF , but when it processes the file, I have a text column that has an LF in it. This is causing it to read that as a row terminator causing it fail. Any ideas? 回答1: Before answering, i don't think that the column contains only LF because if the row delimiter is CRLF it will not consider it as delimiter. So it is probably CRLF , but i will give a solution for the two cases (CRLF or LF)

问题 I make some transformations and validation on a flat .CSV file to import data. I'd like to add a column with the number of time an employee is present in the flat file for exemple : Input Data Flow : Output Data Flow : I don't know how to transform my dataflow... have an idea? 回答1: This is how I would do it: If your data is not already sorted, sort it on Employee_Id. Use a Multicast to split your data flow into two streams. In one of the streams, add an Aggregate transformation that Groups by

问题 Currently I receive a daily file of around 750k rows and each row has a 3 character identifier at the start. For each identifier, the number of columns can change but are specific to the identifier (e.g. SRH will always have 6 columns, AAA will always have 10 and so on). I would like to be able to automate this file into an SQL table through SSIS. This solution is currently built in MSACCESS using VBA just looping through recordsets using a CASE statement, it then writes a record to the

问题 When I attempt to import a .csv comma-delimited flat file into a Microsoft SQL server 2008R2 64-bit instance , for string columns a NULL in the original data becomes a literal string "NULL" and in a numeric column I receive an import error. Can anyone please help??? 回答1: Put the data into a staging table and then insert to the production table using SQL code. update table1 set field1 = NULL where field1 = 'null' Or if you want to do for a lot of fields update table1 set field1 = case when

问题 Every day a PPE.txt file with clients data, separated by semicolon and always with the same layout is stored to a specific file directory. Every day someone has to update a specific table from our database based in this PPE.txt . I want to automate this process via a SQL script What I thought would be a solution is to import the data via a script from this .txt file into a created table, then execute the update. What I have so far is IF EXISTS (SELECT 1 FROM Sysobjects WHERE name LIKE 'CX

问题 As per in this FileHelpers 3.1 example, you can automatically detect a CSV file format using the FileHelpers.Detection.SmartFormatDetector class. But the example goes no further. How do you use this information to dynamically parse a CSV file? It must have something to do with the DelimitedFileEngine but I cannot see how. Update: I figured out a possible way but had to resort to using reflection (which does not feel right). Is there another/better way? Maybe using System.Dynamic? Anyway, here

问题 Is there any framework/library to help writing fixed length flat files in java? I want to write a collection of beans/entities into a flat file without worrying with convertions, padding, alignment, fillers, etcs For example, I'd like to parse a bean like: public class Entity{ String name = "name"; // length = 10; align left; fill with spaces Integer id = 123; // length = 5; align left; fill with spaces Integer serial = 321 // length = 5; align to right; fill with '0' Date register = new Date

问题 I would like to see some examples of simple flat file databases and how they are accessed through a data layer. I've written to and read from a flat file before, but I have not ever created a data layer that accessed the data for an application using text files. If possible, it would be nice to see a tutorial that had a data layer that utilized a simple, custom flat file database. An example that saves custom business objects in XML and then uploads them would be nice because XML is so

问题 A source database field of type INT is read through an OLE DB Source. It is eventually written to a Flat File Destination. The destination Flat File Connection Manager > Advanced page reports it as a four-byte signed integer [DT_I4] . This data type made me think it indicated binary. Clearly, it does not. I was surprised that it was not the more generic numeric [DT_NUMERIC] . I changed this type setting to single-byte signed integer [DT_I1] . I expected this to fail, but it did not. The