[李景山php]thinkphp核心源码注释|Pgsql.class.php

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace Think\Db\Driver;
use Think\Db\Driver;

/**
* Pgsql数据库驱动
*/
class Pgsql extends Driver{

/**
* 解析pdo连接的dsn信息
* @access public
* @param array $config 连接信息
* @return string
*/
protected function parseDsn($config){
$dsn  =   'pgsql:dbname='.$config['database'].';host='.$config['hostname'];
if(!empty($config['hostport'])) {
$dsn  .= ';port='.$config['hostport'];
}
return $dsn;
}
// 飘过

/**
* 取得数据表的字段信息
* @access public
* @return array
*/
public function getFields($tableName) {
list($tableName) = explode(' ', $tableName);
$result =   $this->query('select fields_name as "field",fields_type as "type",fields_not_null as "null",fields_key_name as "key",fields_default as "default",fields_default as "extra" from table_msg('.$tableName.');');
$info   =   array();
if($result){
foreach ($result as $key => $val) {
$info[$val['field']] = array(
'name'    => $val['field'],
'type'    => $val['type'],
'notnull' => (bool) ($val['null'] === ''), // not null is empty, null is yes
'default' => $val['default'],
'primary' => (strtolower($val['key']) == 'pri'),
'autoinc' => (strtolower($val['extra']) == 'auto_increment'),
);
}
}
return $info;
}// 飘过

/**
* 取得数据库的表信息
* @access public
* @return array
*/
public function getTables($dbName='') {
$result =   $this->query("select tablename as Tables_in_test from pg_tables where  schemaname ='public'");
$info   =   array();
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}// 飘过

/**
* limit分析
* @access protected
* @param mixed $lmit
* @return string
*/
public function parseLimit($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;
}// 飘过

}// 飘过