03-23-2011
Quote:
Originally Posted by
sumoka
combining cat & Cut will cause spawning and will utilize more CPU threads which is fine for smaller files.
Not so much "fine" as "negligible".
Quote:
In case of bigger files as in my case, it is better to directly operate the Cut command on the file. This will result in optimum CPU utilization.
Correct. It's a bad habit in general -- test data tends to be small so the problem isn't apparent, only when you make it do real work will you run into trouble.
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LEARN ABOUT PHP
sqlite_escape_string
SQLITE_ESCAPE_STRING(3) SQLITE_ESCAPE_STRING(3)
sqlite_escape_string - Escapes a string for use as a query parameter
SYNOPSIS
string sqlite_escape_string (string $item)
DESCRIPTION
sqlite_escape_string(3) will correctly quote the string specified by $item for use in an SQLite SQL statement. This includes doubling up
single-quote characters ( ') and checking for binary-unsafe characters in the query string.
Although the encoding makes it safe to insert the data, it will render simple text comparisons and LIKE clauses in your queries unusable
for the columns that contain the binary data. In practice, this shouldn't be a problem, as your schema should be such that you don't use
such things on binary columns (in fact, it might be better to store binary data using other means, such as in files).
PARAMETERS
o $item
- The string being quoted. If the $item contains a NUL character, or if it begins with a character whose ordinal value is 0x01,
PHP will apply a binary encoding scheme so that you can safely store and retrieve binary data.
RETURN VALUES
Returns an escaped string for use in an SQLite SQL statement.
NOTES
Note
Do not use this function to encode the return values from UDF's created using sqlite_create_function(3) or sqlite_create_aggre-
gate(3) - use sqlite_udf_encode_binary(3) instead.
Warning
addslashes(3) should NOT be used to quote your strings for SQLite queries; it will lead to strange results when retrieving your
data.
SEE ALSO
sqlite_udf_encode_binary(3).
PHP Documentation Group SQLITE_ESCAPE_STRING(3)