/**
* Returns metadata for all foreign keys in a table.
*/
public function getForeignKeys($table)
{
$keys = array();
$query = 'SELECT CONSTRAINT_NAME, COLUMN_NAME, REFERENCED_TABLE_NAME, REFERENCED_COLUMN_NAME FROM information_schema.KEY_COLUMN_USAGE ' . 'WHERE TABLE_SCHEMA = DATABASE() AND REFERENCED_TABLE_NAME IS NOT NULL AND TABLE_NAME = ' . $this->connection->quote($table);
foreach ($this->connection->query($query) as $id => $row) {
$keys[$id]['name'] = $row['CONSTRAINT_NAME'];
// foreign key name
$keys[$id]['column'] = $row['COLUMN_NAME'];
// local columns
$keys[$id]['ref_table'] = $row['REFERENCED_TABLE_NAME'];
// referenced table
$keys[$id]['ref_column'] = $row['REFERENCED_COLUMN_NAME'];
// referenced columns
}
return array_values($keys);
}
protected function formatValue($value)
{
if (is_string($value)) {
if (strlen($value) > 20) {
$this->remaining[] = $value;
return '?';
} else {
return $this->connection->quote($value);
}
} elseif (is_int($value)) {
return (string) $value;
} elseif (is_float($value)) {
return rtrim(rtrim(number_format($value, 10, '.', ''), '0'), '.');
} elseif (is_bool($value)) {
return $this->driver->formatBool($value);
} elseif ($value === NULL) {
return 'NULL';
} elseif ($value instanceof ActiveRow) {
return $value->getPrimary();
} elseif (is_array($value) || $value instanceof Traversable) {
$vx = $kx = array();
if ($value instanceof Traversable) {
$value = iterator_to_array($value);
}
reset($value);
if (isset($value[0])) {
// non-associative; value, value, value
foreach ($value as $v) {
if (is_array($v) && isset($v[0]) && count($v) > 1) {
// no-associative; (value), (value), (value)
$vx[] = '(' . $this->formatValue($v) . ')';
} else {
$vx[] = $this->formatValue($v);
}
}
if ($this->arrayMode === 'union') {
return implode(' ', $vx);
}
return implode(', ', $vx);
} elseif (Helpers::containsNamedParams($value)) {
//named params e.g. ":id"
foreach ($value as $k => $v) {
if (is_array($v)) {
throw new InvalidArgumentException("Named param '{$k}' contains unsupported array as value.");
}
}
$this->remaining = $this->remaining + $value;
} elseif ($this->arrayMode === 'values') {
// (key, key, ...) VALUES (value, value, ...)
$this->arrayMode = 'multi';
foreach ($value as $k => $v) {
$kx[] = $this->driver->delimite($k);
$vx[] = $this->formatValue($v);
}
return '(' . implode(', ', $kx) . ') VALUES (' . implode(', ', $vx) . ')';
} elseif ($this->arrayMode === 'select') {
// (key, key, ...) SELECT value, value, ...
$this->arrayMode = 'union';
foreach ($value as $k => $v) {
$kx[] = $this->driver->delimite($k);
$vx[] = $this->formatValue($v);
}
return '(' . implode(', ', $kx) . ') SELECT ' . implode(', ', $vx);
} elseif ($this->arrayMode === 'assoc') {
// key=value, key=value, ...
foreach ($value as $k => $v) {
if (substr($k, -1) === '=') {
$k2 = $this->driver->delimite(substr($k, 0, -2));
$vx[] = $k2 . '=' . $k2 . ' ' . substr($k, -2, 1) . ' ' . $this->formatValue($v);
} else {
$vx[] = $this->driver->delimite($k) . '=' . $this->formatValue($v);
}
}
return implode(', ', $vx);
} elseif ($this->arrayMode === 'multi') {
// multiple insert (value, value, ...), ...
foreach ($value as $v) {
$vx[] = $this->formatValue($v);
}
return '(' . implode(', ', $vx) . ')';
} elseif ($this->arrayMode === 'union') {
// UNION ALL SELECT value, value, ...
foreach ($value as $v) {
$vx[] = $this->formatValue($v);
}
return 'UNION ALL SELECT ' . implode(', ', $vx);
} elseif ($this->arrayMode === 'and') {
// (key [operator] value) AND ...
foreach ($value as $k => $v) {
$k = $this->driver->delimite($k);
if (is_array($v)) {
$vx[] = $v ? $k . ' IN (' . $this->formatValue(array_values($v)) . ')' : '1=0';
} else {
$v = $this->formatValue($v);
$vx[] = $k . ($v === 'NULL' ? ' IS ' : ' = ') . $v;
}
}
return $value ? '(' . implode(') AND (', $vx) . ')' : '1=1';
} elseif ($this->arrayMode === 'order') {
// key, key DESC, ...
foreach ($value as $k => $v) {
$vx[] = $this->driver->delimite($k) . ($v > 0 ? '' : ' DESC');
}
return implode(', ', $vx);
}
} elseif ($value instanceof DateTime || $value instanceof DateTimeInterface) {
return $this->driver->formatDateTime($value);
} elseif ($value instanceof SqlLiteral) {
$this->remaining = array_merge($this->remaining, $value->getParameters());
return $value->__toString();
} else {
$this->remaining[] = $value;
return '?';
}
}
