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BUG Using GLOB for case sensitive matches in SQLite3

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As opposed to LIKE, the GLOB operator is case sensitive by default
in SQlite3. It uses "*" instead of "%" for wildcards,
which necessitated a new SearchFilter->getWildcard() method.

SQlite3 doesn't support per-term modifiers,
COLLATE BINARY LIKE is case insensitive by default
unless the field collation is set up accordingly.
There's connection-level modifiers (PRAGMA case_sensitive_like = true),
but that would affect all comparisators in the executed query.
This commit is contained in:
Ingo Schommer 2012-12-11 01:43:37 +01:00
parent 96fdd9178a
commit 36f15a52b4
1 changed files with 31 additions and 0 deletions
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31
code/SQLite3Database.php
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@ -1076,6 +1076,37 @@ class SQLite3Database extends SS_Database {
return true;
}
/**
* Generate a WHERE clause for text matching.
*
* @param String $field Quoted field name
* @param String $value Escaped search. Can include percentage wildcards.
* @param boolean $exact Exact matches or wildcard support.
* @param boolean $negate Negate the clause.
* @param boolean $caseSensitive Enforce case sensitivity if TRUE or FALSE.
* Stick with default collation if set to NULL.
* @return String SQL
*/
public function comparisonClause($field, $value, $exact = false, $negate = false, $caseSensitive = null) {
if($exact && !$caseSensitive) {
$comp = ($negate) ? '!=' : '=';
} else {
if($caseSensitive) {
// GLOB uses asterisks as wildcards.
// Replace them in search string, without replacing escaped percetage signs.
$comp = 'GLOB';
$value = preg_replace('/^%([^\\\\])/', '*$1', $value);
$value = preg_replace('/([^\\\\])%$/', '$1*', $value);
$value = preg_replace('/([^\\\\])%/', '$1*', $value);
} else {
$comp = 'LIKE';
}
if($negate) $comp = 'NOT ' . $comp;
}
return sprintf("%s %s '%s'", $field, $comp, $value);
}
/**
* Function to return an SQL datetime expression that can be used with SQLite3
* used for querying a datetime in a certain format