public function prepare()
{
$sql = ['SELECT'];
$fields = [];
foreach ($this->fields as $key => $field) {
if (is_int($key)) {
$fields[] = $this->escapeName($field);
} else {
$fields[] = $this->escapeName($key) . ' AS ' . $this->escapeName($field);
}
}
$sql[] = implode(', ', $fields);
$sql[] = 'FROM';
$sql[] = $this->escapeName($this->table);
$args = [];
if ($this->conditions) {
$sql[] = 'WHERE';
foreach ($this->conditions as $condition) {
if (is_string($condition)) {
$sql[] = $condition;
} elseif (is_array($condition)) {
$argName = ':' . $condition[0];
$sql[] = '(';
$sql[] = $this->escapeName($condition[0]);
$sql[] = $condition[1];
$sql[] = $argName;
$sql[] = ')';
$args[$argName] = $condition[2];
}
}
}
if ($this->limit) {
$sql[] = 'LIMIT';
$sql[] = $this->limit;
}
$this->query = $this->db->prepare(implode(' ', $sql) . ';');
$this->args = $args;
return $this;
}