[李景山php]thinkphp核心源码注释|Oracle.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;

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

private     $table        = '';
protected   $selectSql    = 'SELECT * FROM (SELECT thinkphp.*, rownum AS numrow FROM (SELECT  %DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%%ORDER%) thinkphp ) %LIMIT%%COMMENT%';

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

/**
* 执行语句
* @access public
* @param string $str  sql指令
* @param boolean $fetchSql  不执行只是获取SQL
* @return integer
*/
public function execute($str,$fetchSql=false) {
$this->initConnect(true);
if ( !$this->_linkID ) return false;
$this->queryStr = $str;
if(!empty($this->bind)){
$that   =   $this;
$this->queryStr =   strtr($this->queryStr,array_map(function($val) use($that){ return '\''.$that->escapeString($val).'\''; },$this->bind));
}
if($fetchSql){
return $this->queryStr;
}
$flag = false;
if(preg_match("/^\s*(INSERT\s+INTO)\s+(\w+)\s+/i", $str, $match)) {
$this->table = C("DB_SEQUENCE_PREFIX").str_ireplace(C("DB_PREFIX"), "", $match[2]);
$flag = (boolean)$this->query("SELECT * FROM user_sequences WHERE sequence_name='" . strtoupper($this->table) . "'");
}
//释放前次的查询结果
if ( !empty($this->PDOStatement) ) $this->free();
$this->executeTimes++;
N('db_write',1); // 兼容代码
// 记录开始执行时间
$this->debug(true);
$this->PDOStatement	=	$this->_linkID->prepare($str);
if(false === $this->PDOStatement) {
$this->error();
return false;
}
foreach ($this->bind as $key => $val) {
if(is_array($val)){
$this->PDOStatement->bindValue($key, $val[0], $val[1]);
}else{
$this->PDOStatement->bindValue($key, $val);
}
}
$this->bind =   array();
$result	=	$this->PDOStatement->execute();
$this->debug(false);
if ( false === $result) {
$this->error();
return false;
} else {
$this->numRows = $this->PDOStatement->rowCount();
if($flag || preg_match("/^\s*(INSERT\s+INTO|REPLACE\s+INTO)\s+/i", $str)) {
$this->lastInsID = $this->_linkID->lastInsertId();
}
return $this->numRows;
}
}// 飘过

/**
* 取得数据表的字段信息
* @access public
*/
public function getFields($tableName) {
list($tableName) = explode(' ', $tableName);
$result = $this->query("select a.column_name,data_type,decode(nullable,'Y',0,1) notnull,data_default,decode(a.column_name,b.column_name,1,0) pk "
."from user_tab_columns a,(select column_name from user_constraints c,user_cons_columns col "
."where c.constraint_name=col.constraint_name and c.constraint_type='P'and c.table_name='".strtoupper($tableName)
."') b where table_name='".strtoupper($tableName)."' and a.column_name=b.column_name(+)");
$info   =   array();
if($result) {
foreach ($result as $key => $val) {
$info[strtolower($val['column_name'])] = array(
'name'    => strtolower($val['column_name']),
'type'    => strtolower($val['data_type']),
'notnull' => $val['notnull'],
'default' => $val['data_default'],
'primary' => $val['pk'],
'autoinc' => $val['pk'],
);
}
}
return $info;
}// 飘过

/**
* 取得数据库的表信息（暂时实现取得用户表信息）
* @access public
*/
public function getTables($dbName='') {
$result = $this->query("select table_name from user_tables");
$info   =   array();
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}// 飘过

/**
* SQL指令安全过滤
* @access public
* @param string $str  SQL指令
* @return string
*/
public function escapeString($str) {
return str_ireplace("'", "''", $str);
}// 飘过

/**
* limit
* @access public
* @return string
*/
public function parseLimit($limit) {
$limitStr    = '';
if(!empty($limit)) {
$limit	=	explode(',',$limit);
if(count($limit)>1)
$limitStr = "(numrow>" . $limit[0] . ") AND (numrow<=" . ($limit[0]+$limit[1]) . ")";
else
$limitStr = "(numrow>0 AND numrow<=".$limit[0].")";
}
return $limitStr?' WHERE '.$limitStr:'';
}// 飘过

/**
* 设置锁机制
* @access protected
* @return string
*/
protected function parseLock($lock=false) {
if(!$lock) return '';
return ' FOR UPDATE NOWAIT ';
}// 飘过
}