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Assign null to a SqlParameter
...e ?: requirement.
You can use the ?? null-coalescing operator as follows
SqlParameter[] parameters = new SqlParameter[1];
SqlParameter planIndexParameter = new SqlParameter("@AgeIndex", SqlDbType.Int);
planIndexParameter.Value = (object)AgeItem.AgeIndex ?? DBNull.Value;
parameters[0] = planIn...
Drop all tables whose names begin with a certain string
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In SQL Server 2005 I had to change the last two lines to close cmds; deallocate cmds.
– Hamish Grubijan
Apr 26 '11 at 14:08
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What is the difference between a schema and a table and a database?
...ion of tables. A DBMS (Database Management System) is the software (like MySQL, SQL Server, Oracle, etc) that manages and runs a database.
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XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serv
...eeded in a separate javascript file instead. (In my case I needed a binary SQLite blob to use with https://github.com/kripken/sql.js/)
I created a file called base64_data.js (and used btoa() to convert the data that I needed and insert it into a <div> so I could copy it).
var base64_data = "...
Where are my postgres *.conf files?
I have recently reinstalled postgresql 8.3 on my Ubuntu 8.04 after update. Used EnterpriseDB package. I can connect to the database locally, I see system DB postgres but I can't configure it because I can't find config files. Searched through entire hard drive and found only samples like pg_hba.con...
What is the Java equivalent for LINQ? [closed]
...s trying to port LINQ to Java are implementations for a concrete scenario (SQL, Objects...) but does not covr the main goal of LINQ: Integrate the Language Query in the code. Due to this, there is no real alternative nor initative, for now, that can be considered as an alternative.
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Find() vs. Where().FirstOrDefault()
...nd makes use of the primary keys (hence indexes), whereas Where is a plain sql query
– percebus
Feb 9 '16 at 19:56
4
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When to use SELECT … FOR UPDATE?
...ds on the concurrency control your database system is using.
MyISAM in MySQL (and several other old systems) does lock the whole table for the duration of a query.
In SQL Server, SELECT queries place shared locks on the records / pages / tables they have examined, while DML queries place update lo...
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...你喽。
最后，这篇文章的高潮来了。这个小姑娘是如何拿到Pre-A轮的千万投资的呢？
你没看错，仅仅15分钟！薛蛮子老师唠了唠嗑，拍了拍小姑娘的脑袋，就马上打款啦！So easy！
小姑娘的网站长啥样我不知道，用PC端真...
How to access a dictionary element in a Django template?
...de in your templates and vice-versa.
I'd try the above method and see what SQL the ORM generates as I'm not sure off the top of my head if it will pre-cache the properties and just create a subselect for the property or if it will iteratively / on-demand run the query to calculate vote count. But if...