function parse($sql)
{
$this->sql = preg_replace("/([()=])/", " \\1 ", $sql);
$this->sql = CPerfQuery::removeSpaces($this->sql);
$match = array();
if (preg_match("/^(select) /i", $this->sql, $match)) {
$this->type = strtolower($match[1]);
} else {
$this->type = "unknown";
}
if ($this->type == "select") {
//0 TODO replace literals with placeholders
//1 remove subqueries from sql
if (!$this->parse_subqueries()) {
return false;
}
//2 parse from
$this->from = new CPerfQueryFrom();
if (!$this->from->parse($this->sql)) {
return false;
}
$tables_regex = "(?:" . implode("|", $this->from->getTableAliases()) . ")";
$this->where = new CPerfQueryWhere($tables_regex);
if (preg_match("/ where (.+?)(\$| group | having | order )/i", $this->sql, $match)) {
$this->where->parse($match[1]);
}
return true;
} else {
return false;
}
}
function parse($sql)
{
$sql = CPerfQuery::removeSpaces($sql);
if (preg_match("/^select(.*) from (.*?) (where|group|having|order)/is", $sql, $match)) {
$this->sql = $match[2];
} elseif (preg_match("/^select(.*) from (.*?)\$/is", $sql, $match)) {
$this->sql = $match[2];
} else {
$this->sql = "";
}
if ($this->sql) {
$arJoinTables = preg_split("/(,|inner\\s+join|left\\s+join)(?= [a-z0-9_]+)/is", $this->sql);
foreach ($arJoinTables as $str) {
$table = new CPerfQueryTable();
if ($table->parse($str)) {
$this->tables[] = $table;
}
}
if (count($this->tables) <= 0) {
return false;
}
$tables_regex = "(?:" . implode("|", $this->getTableAliases()) . ")";
foreach ($this->tables as $table) {
$where = new CPerfQueryWhere($tables_regex);
if ($where->parse($table->join)) {
$this->joins = array_merge($this->joins, $where->joins);
}
}
}
return !empty($this->tables);
}