/**
* Creates a view with name $viewID based on $refType bean type
* and then left-joining the specified types in $types in the given
* order.
*
* @param string $viewID desired name of the view
* @param string $refType first bean type to be used as base
* @param array $types array with types to be left-joined in view
*
* @return boolean $success whether we created a new view (false if already exists)
*/
public function createView($viewID, $refType, $types)
{
if ($this->oodb->isFrozen()) {
return false;
}
$history = array();
$tables = array_flip($this->writer->getTables());
$refTable = $refType;
//$this->writer->safeTable($refType, true);
$currentTable = $refTable;
$history[$refType] = $refType;
foreach ($types as $t) {
if (!isset($history[$t])) {
$history[$t] = $t;
$connection = array($t, $currentTable);
sort($connection);
$connection = implode("_", $connection);
$connectionTable = $this->writer->safeTable($connection, true);
if (isset($tables[$connectionTable])) {
//this connection exists
$srcPoint = $this->writer->safeTable($connection) . "." . $this->writer->safeColumn($currentTable . "_id");
//i.e. partic_project.project_id
$dstPoint = $this->writer->safeTable($currentTable) . "." . $this->writer->safeColumn($this->writer->getIDField($currentTable));
//i.e. project.id
$joins[$connection] = array($srcPoint, $dstPoint);
//now join the type
$srcPoint = $this->writer->safeTable($connection) . "." . $this->writer->safeColumn($t . "_id");
$dstPoint = $this->writer->safeTable($t) . "." . $this->writer->safeColumn($this->writer->getIDField($t));
$joins[$t] = array($srcPoint, $dstPoint);
} else {
//this connection does not exist
$srcPoint = $this->writer->safeTable($t) . "." . $this->writer->safeColumn($currentTable . "_id");
$dstPoint = $this->writer->safeTable($currentTable) . "." . $this->writer->safeColumn($this->writer->getIDField($currentTable));
$joins[$t] = array($srcPoint, $dstPoint);
}
}
//now set the new refTable
$currentTable = $t;
}
try {
$rs = (bool) $this->writer->createView($refType, $joins, $viewID);
} catch (Exception $e) {
throw new RedBean_Exception_SQL('Could not create view, types does not seem related (yet)..');
}
return $rs;
}
/**
* Performs the actual optimization. In this case the optimizer looks
* at the size of the column and the size of the value. If the value size is
* smaller than the column size it tries to convert the column to a smaller
* size. Next, it counts if there is any different between the smaller column
* and the original column. If no differences are found the original column
* gets replaced.
* Like the other optimizers, this optimizer returns TRUE if it thinks
* further optimizations can happen, FALSE otherwise.
*
* @return boolean $yesNo advance to next optimizer
*/
public function optimize()
{
//get the type of the current value
$type = $this->writer->scanType($this->value);
//get all the fields in the table
$fields = $this->writer->getColumns($this->table);
//If the column for some reason does not occur in fields, return
if (!in_array($this->column, array_keys($fields))) {
return false;
}
//get the type we got in the field of the table
$typeInField = $this->writer->code($fields[$this->column]);
//Is the type too wide?
if ($type < $typeInField) {
try {
@$this->adapter->exec("alter table " . $this->writer->safeTable($this->table) . " drop __test");
} catch (Exception $e) {
}
//Try to re-fit the entire column; by testing it.
$type = $this->writer->typeno_sqltype[$type];
//Add a test column.
@$this->adapter->exec("alter table " . $this->writer->safeTable($this->table) . " add __test " . $type);
//Copy the values and see if there are differences.
@$this->adapter->exec("update " . $this->writer->safeTable($this->table) . " set __test=" . $this->writer->safeColumn($this->column) . "");
$rows = $this->adapter->get("select " . $this->writer->safeColumn($this->column) . " as a, __test as b from " . $this->writer->safeTable($this->table));
$diff = 0;
foreach ($rows as $row) {
$diff += $row["a"] != $row["b"];
}
if (!$diff) {
//No differences; shrink column.
@$this->adapter->exec("alter table " . $this->writer->safeTable($this->table) . " change " . $this->writer->safeColumn($this->column) . " " . $this->writer->safeColumn($this->column) . " " . $type);
}
//Throw away test column; we don't need it anymore!
@$this->adapter->exec("alter table " . $this->writer->safeTable($this->table) . " drop __test");
}
return false;
}
/**
* Performs the actual optimization. In this case the optimizer first
* scans the value. If the value if of type 'datetime' and the column
* is not it tries to make the column datetime. If the column is 'datetime'
* and the value 'datetime' it blocks further optimization. If the value
* is NOT 'datetime' then it immediately returns true, thus allowing further
* optimization.
*
* @return boolean $yesNo advance to next optimizer
*/
public function optimize()
{
if (!$this->matchesDateTime($this->value)) {
return true;
}
//get the type of the current value
$type = $this->writer->scanType($this->value);
//get all the fields in the table
$fields = $this->writer->getColumns($this->table);
//If the column for some reason does not occur in fields, return
//print_r($fields);
if (!in_array($this->column, array_keys($fields))) {
return false;
}
//get the type we got in the field of the table
$typeInField = $this->writer->code($fields[$this->column]);
//Is column already datetime?
if ($typeInField != "datetime") {
if ($this->matchesDateTime($this->value)) {
//Ok, value is datetime, can we convert the column to support this?
$cnt = (int) $this->adapter->getCell("select count(*) as n from " . $this->writer->safeTable($this->table) . " where\n\t\t\t\t\t\t {$this->column} regexp '[0-9]{4}-[0-1][0-9]-[0-3][0-9] [0-2][0-9]:[0-5][0-9]:[0-5][0-9]'\n\t\t\t\t\t\t OR {$this->column} IS NULL");
$total = (int) $this->adapter->getCell("SELECT count(*) FROM " . $this->writer->safeTable($this->table));
//Is it safe to convert: ie are all values compatible?
if ($total === $cnt) {
//yes
$this->adapter->exec("ALTER TABLE " . $this->writer->safeTable($this->table) . " change " . $this->writer->safeColumn($this->column) . " " . $this->writer->safeColumn($this->column) . " datetime ");
}
//No further optimization required.
return false;
}
//Further optimization could be useful.
return true;
} else {
//yes column is datetime, if value is stop further optimizing
return false;
}
}
