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Difference between Destroy and Delete
...sted). Returns the frozen instance.
The row is simply removed with an SQL DELETE statement on the record's primary key, and no callbacks are executed.
To enforce the object's before_destroy and after_destroy callbacks or any :dependent association options, use #destroy.
ActiveRecord::Pers...
Convert timestamp to date in MySQL query
I want to convert a timestamp in MySQL to a date.
10 Answers
10
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Storing DateTime (UTC) vs. storing DateTimeOffset
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Add Foreign Key to existing table
...n "SET FOREIGN_KEY_CHECKS=0;" before running the ADD CONSTRAINT command or SQL would complain "Cannot add or update a child row: a foreign key constraint fails".
– Erin Geyer
Mar 8 '17 at 13:03
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Modify table: How to change 'Allow Nulls' attribute from not null to allow null
How to change one attribute in a table using T-SQL to allow nulls (not null --> null)? Alter table maybe?
8 Answers
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NHibernate.MappingException: No persister for: XYZ
...guration..
If you're using app.config...
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<property name="show_sql">true</property>
<property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>
<mapping assembly="Project.DomainModel"/> <!-- Here -->
</session-factory>
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Give examples of functions which demonstrate covariance and contravariance in the cases of both over
...mparator<java.util.Date> { ... } and you want to sort a List<java.sql.Date> with that comparator (java.sql.Date is a sub-class of java.util.Date), you can do with:
<T> void sort(List<T> what, Comparator<? super T> how)
but not with
<T> void sort(List<T>...
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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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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