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FEATURE: added helper functions for datetime operations

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This commit is contained in:
Andreas Piening 2010-02-01 05:15:10 +00:00
parent 3d1ff088ee
commit 899c2fa062
1 changed files with 105 additions and 0 deletions
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105
code/SQLite3Database.php
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@ -1040,6 +1040,111 @@ class SQLite3Database extends SS_Database {
return implode(',', $terms);
}
/**
* dbDatetimeXXX: Helper functions to prepare DBMS specific SQL fragments for basic datetime operations
*/
/**
* Function to return an SQL datetime expression that can be used with SQLite3
* used for querying a datetime in a certain format
* @param string $date to be formated, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $format to be used, supported specifiers:
* %Y = Year (four digits)
* %m = Month (01..12)
* %d = Day (01..31)
* %H = Hour (00..23)
* %i = Minutes (00..59)
* %s = Seconds (00..59)
* %U = unix timestamp, can only be used on it's own
* @return string SQL datetime expression to query for a formatted datetime
*/
function formattedDatetimeClause($date, $format) {
preg_match_all('/%(.)/', $format, $matches);
foreach($matches[1] as $match) if(array_search($match, array('Y','m','d','H','i','s','U')) === false) user_error('formattedDatetimeClause(): unsupported format character %' . $match, E_USER_WARNING);
$translate = array(
'/%i/' => '%M',
'/%s/' => '%S',
'/%U/' => '%s',
);
$format = preg_replace(array_keys($translate), array_values($translate), $format);
$modifiers = array();
if($format == '%s' && $date != 'now') $modifiers[] = 'utc';
if($format != '%s' && $date == 'now') $modifiers[] = 'localtime';
if(preg_match('/^now$/i', $date)) {
$date = "'now'";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date)) {
$date = "'$date'";
}
$modifier = empty($modifiers) ? '' : ", '" . implode("', '", $modifiers) . "'";
return "strftime('$format', $date$modifier)";
}
/**
* Function to return an SQL datetime expression that can be used with SQLite3
* used for querying a datetime addition
* @param string $date, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $interval to be added, use the format [sign][integer] [qualifier], e.g. -1 Day, +15 minutes, +1 YEAR
* supported qualifiers:
* - years
* - months
* - days
* - hours
* - minutes
* - seconds
* This includes the singular forms as well
* @return string SQL datetime expression to query for a datetime (YYYY-MM-DD hh:mm:ss) which is the result of the addition
*/
function datetimeIntervalClause($date, $interval) {
$modifiers = array();
if($date == 'now') $modifiers[] = 'localtime';
if(preg_match('/^now$/i', $date)) {
$date = "'now'";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date)) {
$date = "'$date'";
}
$modifier = empty($modifiers) ? '' : ", '" . implode("', '", $modifiers) . "'";
return "datetime($date$modifier, '$interval')";
}
/**
* Function to return an SQL datetime expression that can be used with SQLite3
* used for querying a datetime substraction
* @param string $date1, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @param string $date2 to be substracted of $date1, can be either 'now', literal datetime like '1973-10-14 10:30:00' or field name, e.g. '"SiteTree"."Created"'
* @return string SQL datetime expression to query for the interval between $date1 and $date2 in seconds which is the result of the substraction
*/
function datetimeDifferenceClause($date1, $date2) {
$modifiers1 = array();
$modifiers2 = array();
if($date1 == 'now') $modifiers1[] = 'localtime';
if($date2 == 'now') $modifiers2[] = 'localtime';
if(preg_match('/^now$/i', $date1)) {
$date1 = "'now'";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date1)) {
$date1 = "'$date1'";
}
if(preg_match('/^now$/i', $date2)) {
$date2 = "'now'";
} else if(preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/i', $date2)) {
$date2 = "'$date2'";
}
$modifier1 = empty($modifiers1) ? '' : ", '" . implode("', '", $modifiers1) . "'";
$modifier2 = empty($modifiers2) ? '' : ", '" . implode("', '", $modifiers2) . "'";
return "strftime('%s', $date1$modifier1) - strftime('%s', $date2$modifier2)";
}
}
/**