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Ruby on Rails - Import Data from a CSV file
I would like to import data from a CSV file into an existing database table. I do not want to save the CSV file, just take the data from it and put it into the existing table. I am using Ruby 1.9.2 and Rails 3.
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What's the difference between deque and list STL containers?
..., it is frequently one of the most important reasons to select the most suitable container for a certain application.
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How to do a regular expression replace in MySQL?
I have a table with ~500k rows; varchar(255) UTF8 column filename contains a file name;
13 Answers
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Ruby on Rails generates model field:type - what are the options for field:type?
...tetime, :timestamp,
:time, :date, :binary, :boolean, :references
See the table definitions section.
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How to select date from datetime column?
...f operators in an indexed column is high. These are some test results on a table with 1,176,000 rows:
using datetime LIKE '2009-10-20%' => 2931ms
using datetime >= '2009-10-20 00:00:00' AND datetime <= '2009-10-20 23:59:59' => 168ms
When doing a second call over the same query the di...
How to check if a stored procedure exists before creating it
...ything after AS:
BEGIN
DECLARE @myvar INT
SELECT *
FROM mytable
WHERE @myvar ...
END
This code does exactly same things a stored proc would do, but is not stored on the database side.
That's much like what is called anonymous procedure in PL/SQL.
Update:
Your question tit...
SQL Server: Maximum character length of object names
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Yes, it is 128, except for temp tables, whose names can only be up to 116 character long.
It is perfectly explained here.
And the verification can be easily made with the following script contained in the blog post before:
DECLARE @i NVARCHAR(800)
SELECT ...
Correct use of Multimapping in Dapper
...rId.
There is a big caveat here, if the column ordering in the underlying table is flipped for some reason:
ProductID | ProductName | AccountOpened | CustomerName | CustomerId
--------------------------------------- -------------------------
splitOn: CustomerId will result in a null custo...
How to create CSV Excel file C#? [closed]
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Its best example...but how can i add two table in single file,means i have a one table of two rows and other table is 10 rows and both have unique column name.I want to add two rows table on top and after gap of two lines i want to add second table.
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How do I create a unique constraint that also allows nulls?
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This very problem hits ADO.NET DataTables too. So even that I can allow nulls in the backing field using this method, the DataTable won't let me store NULLs in a unique column in the first place. If anyone knows a solution for that, please post it here
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