select = is_array($select) ? $select : array($select);
if($from) $this->from = is_array($from) ? $from : array(str_replace('`','',$from) => $from);
if($where) $this->where = is_array($where) ? $where : array($where);
$this->orderby = $orderby;
if($groupby) $this->groupby = is_array($groupby) ? $groupby : array($groupby);
if($having) $this->having = is_array($having) ? $having : array($having);
$this->limit = $limit;
parent::__construct();
}
/**
* Specify the list of columns to be selected by the query.
*
*
* // pass fields to select as single parameter array
* $query->select(array("Col1","Col2"))->from("MyTable");
*
* // pass fields to select as multiple parameters
* $query->select("Col1", "Col2")->from("MyTable");
*
*
* @param mixed $fields
* @return SQLQuery
*/
public function select($fields) {
if (func_num_args() > 1) {
$this->select = func_get_args();
} else {
$this->select = is_array($fields) ? $fields : array($fields);
}
return $this;
}
/**
* Specify the target table to select from.
*
*
* $query->from("MyTable"); // SELECT * FROM MyTable
*
*
* @param string $table
* @return SQLQuery
*/
public function from($table) {
$this->from[] = $table;
return $this;
}
/**
* Add a LEFT JOIN criteria to the FROM clause.
*/
public function leftJoin($table, $onPredicate) {
$this->from[] = "LEFT JOIN $table ON $onPredicate";
}
/**
* Apply a predicate filter to the where clause.
*
* Accepts a variable length of arguments, which represent
* different ways of formatting a predicate in a where clause:
*
*
* // the entire predicate as a single string
* $query->where("Column = 'Value'");
*
* // an exact match predicate with a key value pair
* $query->where("Column", "Value");
*
* // a predicate with user defined operator
* $query->where("Column", "!=", "Value");
*
*
*/
public function where() {
$args = func_get_args();
if (func_num_args() == 3) {
$filter = "{$args[0]} {$args[1]} '{$args[2]}'";
} elseif (func_num_args() == 2) {
$filter = "{$args[0]} = '{$args[1]}'";
} else {
$filter = $args[0];
}
$this->where[] = $filter;
return $this;
}
/**
* Use the disjunctive operator 'OR' to join filter expressions in the WHERE clause.
*/
public function useDisjunction() {
$this->connective = 'OR';
}
/**
* Use the conjunctive operator 'AND' to join filter expressions in the WHERE clause.
*/
public function useConjunction() {
$this->connective = 'AND';
}
/**
* Swap the use of one table with another.
* @param string $old Name of the old table.
* @param string $new Name of the new table.
*/
function renameTable($old, $new) {
$this->replaceText("`$old`", "`$new`");
}
/**
* Swap some text in the SQL query with another.
* @param string $old The old text.
* @param string $new The new text.
*/
function replaceText($old, $new) {
if($this->select) foreach($this->select as $i => $item)
$this->select[$i] = str_replace($old, $new, $item);
if($this->from) foreach($this->from as $i => $item)
$this->from[$i] = str_replace($old, $new, $item);
if($this->where) {
foreach($this->where as $i => $item)
$this->where[$i] = str_replace($old, $new, $item);
}
$this->orderby = str_replace($old, $new, $this->orderby);
if($this->groupby) {
foreach($this->groupby as $i => $item)
$this->groupby[$i] = str_replace($old, $new, $item);
}
if($this->having) {
foreach($this->having as $i => $item)
$this->having[$i] = str_replace($old, $new, $item);
}
}
/**
* Return an SQL WHERE clause to filter a SELECT query.
*
* @return string
*/
function getFilter() {
return ($this->where) ? implode(") {$this->connective} (" , $this->where) : '';
}
/**
* Generate the SQL statement for this query.
*
* @return string
*/
function sql() {
if (!$this->from) return '';
$distinct = $this->distinct ? "DISTINCT " : "";
if($this->delete) {
$text = "DELETE ";
} else if($this->select) {
$text = "SELECT $distinct" . implode(", ", $this->select);
}
$text .= " FROM " . implode(" ", $this->from);
if($this->where) $text .= " WHERE (" . $this->getFilter(). ")";
if($this->groupby) $text .= " GROUP BY " . implode(", ", $this->groupby);
if($this->having) $text .= " HAVING ( " . implode(" ) AND ( ", $this->having) . " )";
if($this->orderby) $text .= " ORDER BY " . $this->orderby;
if($this->limit) $text .= " LIMIT " . $this->limit;
return $text;
}
/**
* Return the generated SQL string for this query
*
* @return string
*/
function __toString() {
return $this->sql();
}
/**
* Execute this query.
* @return Query
*/
function execute() {
return DB::query($this->sql());
}
/// VARIOUS TRANSFORMATIONS BELOW
/**
* Return the number of rows in this query if the limit were removed. Useful in paged data sets.
* @return int
*
* TODO Respect HAVING and GROUPBY, which can affect the result-count
*/
function unlimitedRowCount( $column = "*" ) {
$clone = clone $this;
$clone->select = array("count($column)");
$clone->limit = null;
$clone->orderby = null;
$clone->groupby = null;
return $clone->execute()->value();
}
}
?>