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How to convert an Array to a Set in Java
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Java 8:
String[] strArray = {"eins", "zwei", "drei", "vier"};
Set<String> strSet = Arrays.stream(strArray).collect(Collectors.toSet());
System.out.println(strSet);
// [eins, vier, zwei, drei]
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SQL Server Text type vs. varchar data type [closed]
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TEXT is used for large pieces of string data. If the length of the field exceeed a certain threshold, the text is stored out of row.
VARCHAR is always stored in row and has a limit of 8000 characters. If you try to create a VARCHAR(x), where x > 8000, you...
JPA and Hibernate - Criteria vs. JPQL or HQL
...afer to the programmer, diminishing coding errors - compilation on the HQL string is not validated.
– nuno
Jul 31 '14 at 8:37
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How to get the first and last date of the current year?
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This outputs strings, not dates. If that's what you really need, yay, but if you can use either, keep the dates as dates, and don't use them as strings.
– Jamie F
Nov 18 '12 at 4:09
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Regex Last occurrence?
...r test needed. It changes the meaning of the the $. Standard is end of the string, with Multiline its end of the row. Because the test text in Regexr has multiple rows I need this option there.
– stema
Dec 4 '11 at 12:20
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Reset auto increment counter in postgres
..._id_seq (that is, ${table}_${column}_seq).
This is the ALTER SEQUENCE command you need:
ALTER SEQUENCE product_id_seq RESTART WITH 1453
You can see the sequences in your database using the \ds command in psql. If you do \d product and look at the default constraint for your column, the nextval(....
SQL select join: is it possible to prefix all columns as 'prefix.*'?
I'm wondering if this is possible in SQL. Say you have two tables A and B, and you do a select on table A and join on table B:
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How do I change read/write mode for a file using Emacs?
...t args)
"Run a unix command and, if it returns 0, return the output as a string.
Otherwise, signal an error. The error message is the first line of the output."
(let ((output-buffer (generate-new-buffer "*stdout*")))
(unwind-protect
(let ((return-value (apply 'call-process command nil
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Namespace + functions versus static methods on a class
...you can avoid mentioning it, if you use the keyword "using":
#include <string>
#include <vector>
// Etc.
{
using namespace std ;
// Now, everything from std is accessible without qualification
string s ; // Ok
vector v ; // Ok
}
string ss ; // COMPILATION ERROR
vector vv ;...
updating table rows in postgres using subquery
...ubquery
WHERE dummy.address_id=subquery.address_id;
This syntax is not standard SQL, but it is much more convenient for this type of query than standard SQL. I believe Oracle (at least) accepts something similar.
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