SQL Server导出到Excel

Question

How to increase performance on exporting a database with tables with one to many relationship (in so case many to many relationship) into a single excel file.

Right now, I get all the data from the database and process it into a table using a few for loops, then i change the header of the html file to download it as an excel file. But it take a while for the number of records i have (about 300 records. )

I was just wondering, if there is a faster way to improved performance.

Thanks

Answer 1

It sounds like you're loading each table into memory with your c# code, and then building a flat table by looping through the data. A vastly simpler and faster way to do that would be to use a SQL query with a few JOINs in it: http://www.w3schools.com/sql/sql_join.asp http://en.wikipedia.org/wiki/Join_(SQL )

Also, I get the impression that you're rendering the resulting flat table to html, and then saving that as an excel file. There are several ways that you can create that excel (or csv) file directly, without having to turn it into an html table first.