function explain()
{
//Check required Fields
$missing = false;
if (!isset($_POST["sql"]) || strlen($_POST["sql"]) == 0) {
$missing = true;
}
if ($missing) {
$this->res->success = false;
$this->res->message = "missing required field!";
return null;
}
//get vars
$sql = $_POST["sql"];
$schema_id = $this->params['schema_id'];
$schema = Doo::db()->getOne('Schemata', array('where' => 'id = ' . $schema_id));
//init
$shard_query = new ShardQuery($schema->schema_name);
//execute query
$stmt = $shard_query->query($sql, true);
//build data
$this->res->message = $stmt;
//return
$this->res->success = true;
}
public function run($arg)
{
require 'shard-query-config.php';
if (isset($cache_servers) && !empty($cache_servers)) {
$this->cache = new SaltedCache($cache_servers);
}
if (isset($cache_rules) && !empty($cache_rules)) {
$this->cache_rules = $cache_rules;
}
if (!$arg) {
return false;
}
$arg = (object) $arg;
$fields = false;
$errors = false;
$rows = false;
$sql = "";
$has_rows = false;
$resultset = null;
if (!isset($arg->schema_name)) {
$arg->schema_name = null;
}
$SQ = new ShardQuery($arg->schema_name);
print_r($arg);
if (empty($arg->sql) || !trim($arg->sql)) {
return false;
}
if (stripos($arg->sql, 'select database()') !== false) {
$fields = array(array('type' => 250, 'name' => 'DATABASE()'));
$rows = array(array($SQ->state->schema_name));
$resultset = array('fields' => &$fields, 'rows' => &$rows);
} elseif (preg_match('/^SHOW/i', $arg->sql)) {
$shard_id = array_rand($SQ->state->shards);
$DAL = SimpleDAL::factory($SQ->state->shards[$shard_id]);
$DAL->my_select_db($SQ->state->shards[$shard_id]['db']);
if (preg_match('/show\\s+databases/i', $arg->sql)) {
$databases = $SQ->state->mapper->get_schemata();
$fields = array(array('type' => 250, 'name' => 'Database'));
/* $rows = array();
foreach($databases as $schema_info) {
$rows[] = array($schema_info['schema_name']);
}
*/
$rows = array(array($SQ->state->schema_name));
$resultset = array('fields' => &$fields, 'rows' => &$rows);
} elseif ($stmt = $DAL->my_query($arg->sql)) {
$row = $DAL->my_fetch_assoc();
foreach ($row as $field => $val) {
$rows[0][] = $val;
$fields[] = array('type' => 250, 'name' => $field);
}
while ($row = $DAL->my_fetch_array($stmt, MYSQL_NUM)) {
$rows[] = $row;
}
print_r($rows);
$resultset = array('fields' => &$fields, 'rows' => &$rows);
}
$DAL->my_close();
unset($DAL);
} elseif (preg_match('/select\\s+.*\\sfrom\\s.*/i', $arg->sql) || preg_match('/(create|drop|alter)\\s+.*/i', $arg->sql)) {
$cache_ttl = null;
if (isset($this->cache)) {
$patterns = $this->cache_rules;
foreach ($patterns as $pattern => $ttl) {
if (preg_match($pattern, $arg->sql)) {
$cache_ttl = $ttl;
$resultset = $this->cache->get($arg->sql, $arg->schema_name);
break;
}
}
}
if (!$resultset) {
$stmt = $SQ->query($arg->sql);
if (!empty($SQ->errors)) {
$errors = trim(str_replace(array("\n", "Array", "(", ")", " "), "", print_r($SQ->errors, true)));
}
if ($stmt) {
$has_rows = true;
$rows = array(array());
# get the first row and use it to construct the list of fields + collect row data
# in this first fetch we process data one output column at a time
$row = $SQ->DAL->my_fetch_assoc($stmt);
foreach ($row as $field => $val) {
$rows[0][] = $val;
$fields[] = array('type' => 250, 'name' => $field);
}
# fetch the rest of the rows numerically and stuff into $rows, a row at a time
while ($row = $SQ->DAL->my_fetch_array($stmt, MYSQL_NUM)) {
$rows[] = $row;
}
$resultset = array('fields' => &$fields, 'rows' => &$rows);
}
if (isset($cache_ttl)) {
$this->cache->set($arg->sql, $resultset, $cache_ttl, $arg->schema_name);
}
# return the actual object so that the proxy can finish aggregation and drop the table
}
} else {
$sql = $arg->sql;
}
return json_encode(array('resultset' => $resultset, 'errors' => $errors, 'sql' => $sql, 'has_rows' => $has_rows));
}