Oracle.class.php
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<?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;
}
/**
* 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 $this->numRows;
}
}
/**
* 取得数据表的字段信息
*
* @access public
*/
public function getFields($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 $info;
}
/**
* 取得数据库的表信息（暂时实现取得用户表信息）
*
* @access public
*/
public function getTables($dbName = '')
{
$result = $this->query("select table_name from user_tables");
$info = array();
foreach ($result as $key => $val) {
$info[$key] = current($val);
}
return $info;
}
/**
* SQL指令安全过滤
*
* @access public
* @param string $str
* SQL指令
* @return string
*/
public function escapeString($str)
{
return str_ireplace("'", "''", $str);
}
/**
* limit
*
* @access public
* @return string
*/
public function parseLimit($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 ' . $limitStr : '';
}
/**
* 设置锁机制
*
* @access protected
* @return string
*/
protected function parseLock($lock = false)
{
if (! $lock) {
return '';
}
return ' FOR UPDATE NOWAIT ';
}
}