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What is a JavaBean exactly?
... @worldsayshi - No, it's not required. For example a bean can contain a String; and String is not a bean. (String is immutable, so you cannot create it by calling an empty constructor and a setter.) It seems reasonable that a Serializable object should have Serializable members, unless it somehow...
Postgresql GROUP_CONCAT equivalent?
...ifications:
The result of casting an array to text is that the resulting string starts and ends with curly braces. Those braces need to be removed by some method, if they are not desired.
Casting ANYARRAY to TEXT best simulates CSV output as elements that contain embedded commas are double-quot...
Group a list of objects by an attribute : Java
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In Java 8:
Map<String, List<Student>> studlistGrouped =
studlist.stream().collect(Collectors.groupingBy(w -> w.stud_location));
share
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Determine the path of the executing BASH script [duplicate]
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Your second line has an extra double-quote character.
– Eric Seppanen
Jun 29 '10 at 18:44
add a comment
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Why can't I use Docker CMD multiple times to run multiple services?
...our Dockerfile a little bit cleaner, you could put your CMD commands to an extra file:
FROM centos+ssh
EXPOSE 22
EXPOSE 4149
CMD sh /home/centos/all_your_commands.sh
And a file like this:
service sshd start &
/opt/mq/sbin/rabbitmq-server start
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Display / print all rows of a tibble (tbl_df)
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print (with a tibble) also has the width = and n_extra = options to control how many columns are printed, either directly or indirectly.
– Zhe Zhang
May 17 '17 at 16:57
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Format of the initialization string does not conform to specification starting at index 0
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Check your connection string. If you need help with it check Connection Strings, which has a list of commonly used ones.
Commonly used Connection Strings:
SQL Server 2012
Standard Security
Server=myServerAddress;Database=myDataBase;User Id=myU...
How to get last inserted id?
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string insertSql =
"INSERT INTO aspnet_GameProfiles(UserId,GameId) VALUES(@UserId, @GameId)SELECT SCOPE_IDENTITY()";
int primaryKey;
using (SqlConnection myConnection = new SqlConnection(myConnectionString))
{
myCon...
How to insert values into C# Dictionary on instantiation?
...Dictionary when I create it? I can, but don't want to, do
dict.Add(int, "string") for each item if there is something more efficient like:
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PostgreSQL return result set as JSON array?
...t list like SELECT json_agg((column1, column2, ...)) FROM t - notice the extra brackets. This may not be obvious "out of the box".
– jave.web
Oct 30 '19 at 20:16
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