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<?php
/**
* Database CREATE TABLE query
*
* This file is part of Zoph.
*
* Zoph is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Zoph is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Zoph; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @package Zoph
* @author Jeroen Roos
*/
namespace db;
/**
* Database CREATE TABLE query
*
* @package Zoph
* @author Jeroen Roos
*/
class create extends query {
/** @var string name of the table */
private $name;
/** @var string MariaDB engine */
private $engine="InnoDB";
/** @var array columns */
private $columns=array();
/** @var array primary keys */
private $pKeys=array();
/** @var array keys */
private $keys=array();
/** @var array index */
private $index=array();
/** @var array keylength */
private $keyLength=array();
/** @var array columns that can not be 'null' */
private $notNull=array();
/** @var bool create table with IF NOT EXISTS statement */
private $ifNotExists=false;
/**
* Create a new table
* @param string name
* @param array columns
*/
public function __construct(string $name) {
$this->name=$name;
}
public function addColumns(array $columns) : void {
foreach ($columns as $column) {
$this->addColumn($column);
}
}
public function addColumn(column $column) : void {
$this->columns[]=$column;
}
public function addIndex(string $name, array $fields) : void {
$this->index[$name]=$fields;
}
public function ifNotExists($if = true) : void {
$this->ifNotExists = $if;
}
/**
* Build the clause
* @return string clause
*/
public function __toString() : string {
$this->pKeys=array();
$this->keys=array();
$this->notNull=array();
$sql = "CREATE TABLE " . ($this->ifNotExists ? "IF NOT EXISTS " : "") .
db::getPrefix() . $this->name . " (\n";
foreach ($this->columns as $column) {
$sql .= " " . $column . ",\n";
if ($column->isKey()) {
$this->keys[$column->getKeyName()]=$column;
$this->keyLength[$column->getKeyName()]=$column->getKeyLength();
}
if ($column->isPrimaryKey()) {
$this->pKeys[]=$column->getName();
}
if ($column->isNotNull()) {
$this->notNull[]=$column;
}
}
$sql .= $this->getKeyString();
$sql .= $this->getIndexString();
// Remove last comma
$sql = substr($sql, 0, -2) . "\n";
$sql .= ") ENGINE=" . $this->engine;
return $sql;
}
/**
* Get KEY and PRIMARY KEY statements
* @return string SQL snippet.
*/
private function getKeyString() : string {
$sql = "";
if (!empty($this->pKeys)) {
$sql .= " PRIMARY KEY (" . implode(", ", $this->pKeys) . "),\n";
}
if (!empty($this->keys)) {
foreach ($this->keys as $name => $column) {
if ($this->keyLength[$name] > 0) {
$length = "(" . $this->keyLength[$name] . ")";
} else {
$length = "";
}
$sql .= " KEY " . $name . "(" . $column->getName() . $length . "),\n";
}
}
return $sql;
}
/**
* Get INDEX statements
* INDEX and KEY are synonyms in MySQL, we use KEY for single column indices and
* INDEX for multi-column indices except for PRIMARY KEYs.
* @return string SQL snippet
*/
private function getIndexString() : string {
$sql = "";
if (!empty($this->index)) {
foreach ($this->index as $name => $columns) {
$sql .= " INDEX " . $name . " (" . implode(", ", $columns) . "),\n";
}
}
return $sql;
}
}
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