public function testExpression()
{
$expr = new Expr('column', '+', 5);
$this->assertEquals('column', $expr->getField());
$this->assertEquals('+', $expr->getOperator());
$this->assertEquals('5', $expr->getValue());
}
/**
* Process a parameter before adding it to the list.
* Set the primary predicate type if it has not been set.
*
* @param string $field
* @param string $op
* @param mixed $value
* @return $this
*/
public function add($field, $op, $value)
{
$param = new Expr($field, $op, $value);
$this->_params[] = $param;
if ($param->useValue()) {
$this->addBinding($field, $value);
}
return $this;
}
/**
* Format database expressions.
*
* @param \Titon\Db\Query\Expr $expr
* @return string
*/
public function formatExpression(Expr $expr)
{
$field = $expr->getField();
$operator = $expr->getOperator();
$value = $expr->getValue();
if ($operator === Expr::AS_ALIAS) {
return sprintf($this->getClause(self::AS_ALIAS), $this->quote($field), $this->quote($value));
// No value to use so exit early
} else {
if (!$expr->useValue() && !($operator === Expr::NULL || $operator === Expr::NOT_NULL)) {
return $this->quote($field);
}
}
$isSubQuery = $value instanceof SubQuery;
// Function as field
if ($field instanceof Func) {
$field = $this->formatFunction($field);
// Raw expression as field
} else {
if ($field instanceof RawExpr) {
$field = $field->getValue();
// Regular clause
} else {
$field = $this->quote($field);
}
}
// IN has special case
if ($operator === Expr::IN || $operator === Expr::NOT_IN) {
if ($isSubQuery) {
$clause = sprintf($this->getClause($operator), $field, '?');
$clause = str_replace(['(', ')'], '', $clause);
} else {
$clause = sprintf($this->getClause($operator), $field, implode(', ', array_fill(0, count($value), '?')));
}
// Operators with clauses
} else {
if ($this->hasClause($operator)) {
$clause = sprintf($this->getClause($operator), $field);
// Basic operator
} else {
$clause = sprintf($this->getClause(self::EXPRESSION), $field, $operator);
}
}
// Replace ? with sub-query statement
if ($isSubQuery) {
/** @type \Titon\Db\Query\SubQuery $value */
// EXISTS and NOT EXISTS doesn't have a field or operator
if (in_array($value->getFilter(), [SubQuery::EXISTS, SubQuery::NOT_EXISTS], true)) {
$clause = $this->formatSubQuery($value);
} else {
$clause = str_replace('?', $this->formatSubQuery($value), $clause);
}
}
return $clause;
}