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SQLite in Android How to update a specific row
...the line should be: myDB.update(TableName, cv, "_id=?", new String[]{id}). SQLite will automatically fill the fourth param into the "?" in the third param, i.e. the WHERE clause. If your third param contains n "?"s , the fourth param should be a String[] of length n
– Cristiano...
Select data from date range between two dates
...ously, second way is much more simple (only two cases against four).
Your SQL will look like:
SELECT * FROM Product_sales
WHERE NOT (From_date > @RangeTill OR To_date < @RangeFrom)
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Deleting all records in a database table
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If you are looking for a way to it without SQL you should be able to use delete_all.
Post.delete_all
or with a criteria
Post.delete_all "person_id = 5 AND (category = 'Something' OR category = 'Else')"
See here for more information.
The records are deleted wit...
How to 'bulk update' with Django?
I'd like to update a table with Django - something like this in raw SQL:
5 Answers
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“互联网卖菜”没那么简单 创业者不要盲目跟风 - 资讯 - 清泛网 - 专注C/C+...
...的出发点是什么？便宜，吃的放心是最多的答案，但问及如何去做，多数人还是茫然。很多人都有这样的经历，每次去超市菜场总会暗骂商贩们把菜价喊得这么高，而且全部商贩统一口径不降价，第一反应想到的就是人工成本高...
What's the best way of structuring data on firebase?
...There is now a doc on structuring data. Also, see this excellent post on NoSQL data structures.
The main issue with hierarchical data, as opposed to RDBMS, is that it's tempting to nest data because we can. Generally, you want to normalize data to some extent (just as you would do with SQL) despite...
How do you find the row count for all your tables in Postgres
...tatement like the one you used against each table. This is because PostgreSQL keeps row visibility information in the row itself, not anywhere else, so any accurate count can only be relative to some transaction. You're getting a count of what that transaction sees at the point in time when it exe...
Error Code: 2013. Lost connection to MySQL server during query
I got the Error Code: 2013. Lost connection to MySQL server during query error when I tried to add an index to a table using MySQL Workbench.
I noticed also that it appears whenever I run long query.
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Multiple DB Contexts in the Same DB and Application in EF 6 and Code First Migrations
...ApplicationDbContext.Configuration
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Applying explicit migrations: [201402032113124_InitialDatabaseCreation].
Applying explicit migration: 201402032113124_InitialDatabaseCreation.
Running Seed method.
PM> ...
Are soft deletes a good idea? [duplicate]
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@Josh: everything in SQL programming is fairly trivial; it's the accumulation of lots of trivial things that starts to cause problems. As I said in my last sentence, I would expect a developer to have a good reason for increasing the complexity o...