/**
* Returns the SQL to check if a value is one in a set of
* given values.
*
* in() accepts an arbitrary number of parameters. The first parameter
* must always specify the value that should be matched against. Successive
* parameters must contain a logical expression or an array with logical
* expressions. These expressions will be matched against the first
* parameter.
*
* Example:
* <code>
* $q->select( '*' )->from( 'table' )
* ->where( $q->expr->in( 'id', 1, 2, 3 ) );
* </code>
*
* Oracle limits the number of values in a single IN() to 1000. This
* implementation creates a list of combined IN() expressions to bypass
* this limitation.
*
* @throws ezcQueryVariableParameterException if called with less than two
* parameters.
* @throws ezcQueryInvalidParameterException if the 2nd parameter is an
* empty array.
* @param string|array(string) values that will be matched against $column
* @return string logical expression
*/
public function in($column)
{
$args = func_get_args();
if (count($args) < 2) {
throw new ezcQueryVariableParameterException('in', count($args), 2);
}
if (is_array($args[1]) && count($args[1]) == 0) {
throw new ezcQueryInvalidParameterException('in', 2, 'empty array', 'non-empty array');
}
$values = ezcQuerySelect::arrayFlatten(array_slice($args, 1));
$values = $this->getIdentifiers($values);
$column = $this->getIdentifier($column);
if (count($values) == 0) {
throw new ezcQueryVariableParameterException('in', count($args), 2);
}
if ($this->quoteValues) {
foreach ($values as $key => $value) {
switch (true) {
case is_int($value):
case is_float($value):
case $value instanceof ezcQuerySubSelect:
$values[$key] = (string) $value;
break;
default:
$values[$key] = $this->db->quote($value);
}
}
}
if (count($values) <= 1000) {
return "{$column} IN ( " . join(', ', $values) . ' )';
} else {
$expression = '( ';
do {
$bunch = array_slice($values, 0, 1000);
$values = array_slice($values, 1000);
$expression .= "{$column} IN ( " . join(', ', $bunch) . ' ) OR ';
} while (count($values) > 1000);
$expression .= "{$column} IN ( " . join(', ', $values) . ' ) )';
return $expression;
}
}
/**
* Returns a series of strings concatinated
*
* concat() accepts an arbitrary number of parameters. Each parameter
* must contain an expression or an array with expressions.
*
* @param string|array(string) $... strings that will be concatinated.
*/
public function concat()
{
$args = func_get_args();
$cols = ezcQuerySelect::arrayFlatten($args);
if (count($cols) < 1) {
throw new ezcQueryVariableParameterException('concat', count($args), 1);
}
$cols = $this->getIdentifiers($cols);
return "CONCAT( " . join(', ', $cols) . ' )';
}
