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Storing large strings in POSTGRES and comparing


Storing large strings in POSTGRES and comparing

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Storing large strings in POSTGRES and comparing
Tag : postgresql , By : firebasket
Date : November 28 2020, 09:01 AM

This might help you Personally I would store a hash of the path component and/or the whole URL. Then for searches I'd check the hash.

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Postgres Conditional Query - Best Practice for comparing a string with several other strings


Tag : postgresql , By : Viv
Date : March 29 2020, 07:55 AM
help you fix your problem Postgres knows POSIX regular expressions. Your query could be formulated as
...AND weapon ~* $1

Android SQLiteDatabase - Storing and Comparing Large Numbers


Tag : android , By : paolodm
Date : March 29 2020, 07:55 AM
I wish did fix the issue. For storage, your only choices are TEXT or BLOB, so you must encode your numbers in a way so that lexicographical and numeric ordering are the same.
For unsigned numbers, you could use a mechanism similar to SQLite4's varint encoding:
0001|0  ...
0001|9
0002|10  ...
0002|99
0003|100  ...
0060|321741185926535897932384626433832795281828459045235360287471

Which is better when storing some large texts: strings in XML resource file or a java Strings in a class


Tag : android , By : user183842
Date : March 29 2020, 07:55 AM
wish help you to fix your issue XML resource file would be better option. Keep the class file code as clean as possible.

Storing and comparing a large quantity of Strings in Java


Tag : java , By : Giles
Date : March 29 2020, 07:55 AM
hope this fix your issue ArrayList is a memory effective. Probably your issue is caused by java.util.Scanner. Scanner creates a lot of temp objects during parsing (Patterns, Matchers etc) and not suitable for big files.
Try to replace it with java.io.BufferedReader:
List<String> stringList = new ArrayList<String>();
BufferedReader fileIn = new BufferedReader(new FileReader("UTF-8"));
String line = null;
while ((line = fileIn.readLine()) != null) {
    line = line.trim();

    if (line.isEmpty()) continue;
    if (line.startsWith("#")) continue;   //ignore comments

    stringList.add(line);
}
fileIn.close();

Comparing strings in postgres using comparison operators?


Tag : postgresql , By : goffi
Date : March 29 2020, 07:55 AM
I wish this help you NOTE: The original answer went off on a red herring.
A simple comparison sorts character by character.
select 'a1' < 'a9'; -- true because 'a' = 'a' and '1' < '9'.
select 'a10' < 'a9'; -- also true for the same reason.
CREATE FUNCTION btrsort_nextunit(text) RETURNS text AS $$
    SELECT 
        CASE WHEN $1 ~ '^[^0-9]+' THEN
            COALESCE( SUBSTR( $1, LENGTH(SUBSTRING($1 FROM '[^0-9]+'))+1 ), '' )
        ELSE
            COALESCE( SUBSTR( $1, LENGTH(SUBSTRING($1 FROM '[0-9]+'))+1 ), '' )
        END

$$ LANGUAGE SQL;

CREATE FUNCTION btrsort(text) RETURNS text AS $$
    SELECT 
        CASE WHEN char_length($1)>0 THEN
            CASE WHEN $1 ~ '^[^0-9]+' THEN
                RPAD(SUBSTR(COALESCE(SUBSTRING($1 FROM '^[^0-9]+'), ''), 1, 12), 12, ' ') || btrsort(btrsort_nextunit($1))
            ELSE
                LPAD(SUBSTR(COALESCE(SUBSTRING($1 FROM '^[0-9]+'), ''), 1, 12), 12, ' ') || btrsort(btrsort_nextunit($1))
            END
        ELSE
            $1
        END
      ;
$$ LANGUAGE SQL;
select * from things order by btrsort(whatever);
create index things_whatever_btrsort_idx ON things( btrsort(whatever) );
SELECT
  CASE WHEN 'a' < 'b' THEN 'yes' END
  FROM table
  Output: null
SELECT
CASE WHEN 'a' < 'b' THEN 'yes' END  -- yes
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