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class Query {
protected $baseTable;
protected $baseTableAlias;
protected $whereGroup;
protected $joins = array();
protected $fields = array();
protected $executed = FALSE;
protected $resource = NULL;
function __construct($base_table = 'node', $alias = 'n') {
$this->whereGroup = new QueryWhereGroup();
$this->baseTable = $base_table;
$this->baseTableAlias = empty($alias) ? $base_table : $alias;
}
function select($fields) {
settype($fields, 'array');
foreach ($fields as $alias => $field) {
if (is_numeric($alias)) {
$this->fields[] = $field;
}
else {
$this->fields[$alias] = "$field as $alias";
}
}
return $this;
}
/**
* @param QueryWhereGroup $whereGroup
* @return Query
*/
function where($whereGroup) {
call_user_func_array(array($this->whereGroup, 'cond'), func_get_args());
return $this;
}
function createWhereGroup() {
return new QueryWhereGroup();
}
function join($table, $alias = NULL, $condition, $join_type = 'INNER') {
if (!$alias) {
$alias = $table;
}
if (is_array($condition)) {
$condition = 'USING ('. join(', ', $condition) .')';
}
if (!preg_match('/^ON|USING/i', $condition)) {
$condition = 'ON '. $condition;
}
$this->joins[$alias] = "$join_type JOIN $table $alias $condition";
return $this;
}
function compile() {
$select_fields = join(', ', array_unique($this->fields));
$joins_list = join("\n", $this->joins);
$where_conditions = $this->whereGroup->compile();
if (!empty($where_conditions)) {
$where_conditions = 'WHERE '. $where_conditions;
}
return "SELECT $select_fields FROM {{$this->baseTable}} {$this->baseTableAlias} \n $joins_list $where_conditions";
}
function args() {
return $this->whereGroup->args;
}
function execute() {
return db_query($this->compile(), $this->args());
}
function fetchAll() {
$res = $this->execute();
while($row = db_fetch_object($res)) {
$rows[] = $row;
}
return $rows;
}
}
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