Firebird数据库的 PDO驱动

适用于：ThinkPHP3.2.3+

// +----------------------------------------------------------------------
// | 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
// +----------------------------------------------------------------------

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

/**
* Firebird数据库驱动
*/
class Firebird extends Driver{
protected $selectSql = 'SELECT %LIMIT% %DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%%ORDER%';
/**
* 解析pdo连接的dsn信息
* @access public
* @param array $config 连接信息
* @return string
*/
protected function parseDsn($config){
$dsn = 'firebird:dbname='.$config['hostname'].'/'.($config['hostport']?:3050).':'.$config['database'];
return $dsn;
}

/**
* 连接数据库方法
* @access public
*/
public function connect($config='',$linkNum=0) {
if ( !isset($this->linkID[$linkNum]) ) {
if(empty($config)) $config = $this->config;
try{
if(empty($config['dsn'])) {
$config['dsn'] = $this->parseDsn($config);
}
$this->linkID[$linkNum] = new PDO( $config['dsn'], $config['username'], $config['password']);
}catch (\PDOException $e) {
E($e->getMessage());
}
}
return $this->linkID[$linkNum];
}

/**
* 执行语句
* @access public
* @param string $str sql指令
* @param boolean $fetchSql 不执行只是获取SQL
* @return mixed
*/
public function execute($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 $this->queryStr;
}
//释放前次的查询结果
if ( !empty($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 === $this->PDOStatement) {
E($this->error());
}
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();
return $this->numRows;
}
}

/**
* 取得数据表的字段信息
* @access public
*/
public function getFields($tableName) {
$this->initConnect(true);
list($tableName) = explode(' ', $tableName);
$sql='SELECT RF.RDB$FIELD_NAME AS FIELD,RF.RDB$DEFAULT_VALUE AS DEFAULT1,RF.RDB$NULL_FLAG AS NULL1,TRIM(T.RDB$TYPE_NAME) || \'(\' || F.RDB$FIELD_LENGTH || \')\' as TYPE FROM RDB$RELATION_FIELDS RF LEFT JOIN RDB$FIELDS F ON (F.RDB$FIELD_NAME = RF.RDB$FIELD_SOURCE) LEFT JOIN RDB$TYPES T ON (T.RDB$TYPE = F.RDB$FIELD_TYPE) WHERE RDB$RELATION_NAME=UPPER(\''.$tableName.'\') AND T.RDB$FIELD_NAME = \'RDB$FIELD_TYPE\' ORDER By RDB$FIELD_POSITION';
$result = $this->query($sql);
$info = array();
if($result){
foreach($result as $key => $val){
$info[trim($val['FIELD'])] = array(
'name' => trim($val['FIELD']),
'type' => $val['TYPE'],
'notnull' => (bool) ($val['NULL1'] ==1), // 1表示不为Null
'default' => $val['DEFAULT1'],
'primary' => false,
'autoinc' => false,
);
}
}

//获取主键
$sql='select b.rdb$field_name as field_name from rdb$relation_constraints a join rdb$index_segments b on a.rdb$index_name=b.rdb$index_name where a.rdb$constraint_type=\'PRIMARY KEY\' and a.rdb$relation_name=UPPER(\''.$tableName.'\')';
$rs_temp = $this->query($sql);
foreach($rs_temp as $row) {
$info[trim($row['FIELD_NAME'])]['primary']=True;
}

return $info;
}

/**
* 取得数据库的表信息
* @access public
*/
public function getTables($dbName='') {
$sql='SELECT DISTINCT RDB$RELATION_NAME FROM RDB$RELATION_FIELDS WHERE RDB$SYSTEM_FLAG=0';
$result = $this->query($sql);
$info = array();
foreach ($result as $key => $val) {
$info[$key] = trim(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_replace("'", "''", $str);
}

/**
* limit
* @access public
* @param $limit limit表达式
* @return string
*/
public function parseLimit($limit) {
$limitStr = '';
if(!empty($limit)) {
$limit = explode(',',$limit);
if(count($limit)>1) {
$limitStr = ' FIRST '.$limit[1].' SKIP '.$limit[0].' ';
}else{
$limitStr = ' FIRST '.$limit[0].' ';
}
}
return $limitStr;
}
}

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