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What column type/length should I use for storing a Bcrypt hashed password in a Database?
...ectively.
As you use the 2a format, you’ll need 60 bytes. And thus for MySQL I’ll recommend to use the CHAR(60) BINARYor BINARY(60) (see The _bin and binary Collations for information about the difference).
CHAR is not binary safe and equality does not depend solely on the byte value but on the ...
REST, HTTP DELETE and parameters
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It's an old question, but here are some comments...
In SQL, the DELETE command accepts a parameter "CASCADE", which allows you to specify that dependent objects should also be deleted. This is an example of a DELETE parameter that makes sense, but 'man rm' could provide others. H...
Using ThreadPool.QueueUserWorkItem in ASP.NET in a high traffic scenario
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What about database inserts? Is there an ASYNC SQL command (like Execute)? Database inserts are about the slowest I/O operation around (because of locking) and having the main thread wait for the row(s) to be inserted is just a waste of CPU cycles.
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Difference between DateTime and Time in Ruby
...idually. This is a Ruby on Rails construct that serves as a wrapper around SQL-standard DATETIME fields. These contain arbitrary dates and can represent nearly any point in time as the range of expression is typically very large.
DateTime.new
# => Mon, 01 Jan -4712 00:00:00 +0000
So it's reass...
Troubleshooting “Illegal mix of collations” error in mysql
...the below error when trying to do a select through a stored procedure in MySQL.
16 Answers
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Most useful NLog configurations [closed]
...etLogger("Database.Query");
Logger logger = LogManager.GetLogger("Database.SQL");
Logger logger = LogManager.GetLogger("Analysis.Financial");
Logger logger = LogManager.GetLogger("Analysis.Personnel");
Logger logger = LogManager.GetLogger("Analysis.Inventory");
And so on. With hierarchical logger...
Override Java System.currentTimeMillis for testing time sensitive code
...er compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes. Hibernate 5 & JPA 2.2 support java.time.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, Java SE 11, and later - Part of the standard Java API with a bundled implementation.
Java...
How can I pair socks from a pile efficiently?
...ately
This kind of recursive hash partitioning is actually being done by SQL Server when it needs to hash join or hash aggregate over huge data sets. It distributes its build input stream into many partitions which are independent. This scheme scales to arbitrary amounts of data and multiple CPUs ...
How do I pass variables and data from PHP to JavaScript?
... serialization format and JSON objects appear inside strings (kind of like SQL queries in server-side languages). However, in this answer the JSON method relies on the fact that most JSON objects are also valid JavaScript object so we write a JSON object into JavaScript code.
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Select first row in each GROUP BY group?
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On Oracle 9.2+ (not 8i+ as originally stated), SQL Server 2005+, PostgreSQL 8.4+, DB2, Firebird 3.0+, Teradata, Sybase, Vertica:
WITH summary AS (
SELECT p.id,
p.customer,
p.total,
ROW_NUMBER() OVER(PARTITION BY p.customer
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