library\think\db\builder\Pgsql.php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st
// +----------------------------------------------------------------------
namespace think\db\builder;
use think\db\Builder;
/**
* Pgsql数据库驱动
*/
class Pgsql extends Builder
{
/**
* limit分析
* @access protected
* @param mixed $limit
* @return string
*/
public function parseLimit($limit)
{
$limitStr = '';
if (!empty($limit)) {
$limit = explode(',', $limit);
if (count($limit) > 1) {
$limitStr .= ' LIMIT ' . $limit[1] . ' OFFSET ' . $limit[0] . ' ';
} else {
$limitStr .= ' LIMIT ' . $limit[0] . ' ';
}
}
return $limitStr;
}
/**
* 字段和表名处理
* @access protected
* @param string $key
* @param array $options
* @return string
*/
protected function parseKey($key, $options = [])
{
$key = trim($key);
if (strpos($key, '$.') && false === strpos($key, '(')) {
// JSON字段支持
list($field, $name) = explode('$.', $key);
$key = $field . '->>\'' . $name . '\'';
} elseif (strpos($key, '.')) {
list($table, $key) = explode('.', $key, 2);
if (isset($options['alias'][$table])) {
$table = $options['alias'][$table];
}
}
if (isset($table)) {
$key = $table . '.' . $key;
}
return $key;
}
/**
* 随机排序
* @access protected
* @return string
*/
protected function parseRand()
{
return 'RANDOM()';
}
}