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How to remove a column from an existing table?
...y additional table changes but generally speaking this is not so trivial.
If this column is referenced by other tables then you need to figure out what to do with other tables/columns. One option is to remove foreign keys and keep referenced data in other tables.
Another option is to find all refe...
Is it unnecessary to put super() in constructor?
Isn't this one automatically put by the compiler if I don't put it in a subclass's constructor?
6 Answers
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Best way to work with transactions in MS SQL Server Management Studio
... some T-SQL queries here.
Rollback transaction -- OR commit transaction
If you want to incorporate error handling you can do so by using a TRY...CATCH BLOCK. Should an error occur you can then rollback the tranasction within the catch block.
For example:
USE AdventureWorks;
GO
BEGIN TRANSACTION...
Start ssh-agent on login
...${SSH_ENV}" > /dev/null
/usr/bin/ssh-add;
}
# Source SSH settings, if applicable
if [ -f "${SSH_ENV}" ]; then
. "${SSH_ENV}" > /dev/null
#ps ${SSH_AGENT_PID} doesn't work under cywgin
ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
start_agent;
...
What method in the String class returns only the first N characters?
I'd like to write an extension method to the String class so that if the input string to is longer than the provided length N , only the first N characters are to be displayed.
...
How to loop through all the properties of a class?
... there is no "System.Reflection" entry in the list
Edit: You can also specify a BindingFlags value to type.GetProperties():
BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
PropertyInfo[] properties = type.GetProperties(flags);
That will restrict the returned properties to publi...
How to really read text file from classpath in Java
...tive to the package of the class unless
// you include a leading slash, so if you don't want to use the current
// package, include a slash like this:
InputStream in = this.getClass().getResourceAsStream("/SomeTextFile.txt");
If those aren't working, that suggests something else is wrong.
So for ...
ORA-30926: unable to get a stable set of rows in the source tables
...
This is usually caused by duplicates in the query specified in USING clause. This probably means that TABLE_A is a parent table and the same ROWID is returned several times.
You could quickly solve the problem by using a DISTINCT in your query (in fact, if 'Y' is a constant val...
Difference between assertEquals and assertSame in phpunit?
...adically, but according to the docs:
assertSame
Reports an error identified by $message if the two variables $expected and $actual do not have the same type and value."
And as you can see in the example below the above excerpt, they are passing '2204' and 2204, which will fail using assertSam...
Using Pairs or 2-tuples in Java [duplicate]
...sign this class further regarding equality, immutability, etc., especially if you plan to use instances as keys for hashing.
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