php封装db 类连接sqlite3

摘要：最新插入的支持数据库移植如果你的部署将来有多种数据库那就用它了同时是设计的执行效率较高他已经封装为的扩展库组件了运行快效率高这是修改为版本的原生类导入的配置文件我这里只是方便前端修改，也可以搞成文件

init();
                return;
            }
            $this->db = new SQLite3("./db.php");
        }
        function init(){
            $this->db = new SQLite3("./db.php");
            // TODO:
        }

        function changes(){
            return $this->db->changes();
        }

        function query($sql,$param=null,$memb=null){
            $stmt=$this->db->prepare($sql);
            if(!$stmt)
                return false;
            if($param){
                if(is_array($param)){
                    for($i=0;$ibindValue($i+1,$param[$i]);
                }else{
                    $stmt->bindValue(1,$param);
                }
            }
            $rs=$stmt->execute();
            if(!$rs){
                $stmt->close();
                return false;
            }
            $arr=$rs->fetchArray(SQLITE3_NUM);
            $rs->finalize();
            $stmt->close();
            if(!$arr)
                return null;
            if(!$memb)
                return $arr;
            $res=array();
            for($i=0;$idb->prepare($sql);
            if(!$stmt)
                return false;
            if($param){
                if(is_array($param)){
                    for($i=0;$ibindValue($i+1,$param[$i]);
                }else{
                    $stmt->bindValue(1,$param);
                }
            }
            $rs=$stmt->execute();
            if(!$rs){
                $stmt->close();
                return false;
            }
            
            $res=array();
            while($arr=$rs->fetchArray(SQLITE3_NUM)){
                if(!$memb) {
                    $res[]=$arr;
                    continue;
                }
                if(count($memb)==1 && $memb[0]==null){
                    $res[]=$arr[0];
                    continue;
                }
                $it=array();
                for($i=0;$ifinalize();
            $stmt->close();
            
            return $res;
        }

        function querySingle($sql,$param=null){
            $res=$this->query($sql,$param);
            if(!$res)
                return false;
            return $res[0];
        }
        
        function querySingleAll($sql,$param=null){
            $stmt=$this->db->prepare($sql);
            if(!$stmt)
                return false;
            if($param){
                if(is_array($param)){
                    for($i=0;$ibindValue($i+1,$param[$i]);
                }else{
                    $stmt->bindValue(1,$param);
                }
            }
            $rs=$stmt->execute();
            if(!$rs){
                $stmt->close();
                return false;
            }
            
            $res=array();
            while($arr=$rs->fetchArray(SQLITE3_NUM)){
                $res[]=$arr[0];
            }
            $rs->finalize();
            $stmt->close();
            
            return $res;
        }

        function exec($sql,$param=null){
            $stmt=$this->db->prepare($sql);
            if(!$stmt)
                return false;
            if($param){
                if(is_array($param)){
                    for($i=0;$ibindValue($i+1,$param[$i]);
                }else{
                    $stmt->bindValue(1,$param);
                }
            }
            $rs=$stmt->execute();
            if($rs) {
                $res=true;
                $rs->finalize();
            }else{
                $res=false;
            }
            $stmt->close();
            return $res;
        }
        
        function begin(){
            return $this->exec("BEGIN");
        }
        function rollback(){
            return $this->exec("ROLLBACK");
        }
        function commit(){
            return $this->exec("COMMIT");
        }
        
        function escapeString($s){
            return $this->db->escapeString($s);
        }
        //最新插入的id
        function lastInsertRowID(){
            return $this->db->lastInsertRowID();
        }
        
        function lastErrorMsg (){
            return $this->db->lastErrorMsg();
        }
    }
?>

PDO支持数据库移植,如果你的部署将来有多种数据库,那就用它了.同时,PDO是C设计的,执行效率较高.他已经封装为PHP的扩展库组件了.运行快,效率高

class dbManager{
    
    function __construct($config) {
        $text = file_get_contents($config);
        $obj = json_decode($text);
        $this->db= new PDO($obj -> dsn, $obj -> user, $obj -> pass);
    }
    
    private function bind_param($stmt,&$param){
        if ($param || $param===0) {
            if (is_array($param)) {
                for ($i = 0; $i < count($param); $i++)
                    $stmt -> bindParam($i + 1, $param[$i]);
            } else {
                $stmt -> bindParam(1, $param);
            }
        }
    }
    
    function exec($sql, $param = null) {
        $stmt = $this -> db -> prepare($sql);
        if (!$stmt){
            var_dump($this->db->errorinfo());
            return false;
        }
        $this->bind_param($stmt,$param);
        $res = $stmt -> execute();
        if($res){
            $res=$stmt->rowCount();
        }
        $stmt -> closeCursor();
        return $res;
    }
    
    function query($sql,$param=null,$name=true){
        $stmt = $this -> db -> prepare($sql);
        if (!$stmt){
            return null;
        }
        $this->bind_param($stmt,$param);
        $res = $stmt -> execute();
        if(!$res){
            $stmt->closeCursor();
            return null;
        }
        $arr=$stmt->fetch($name?PDO::FETCH_ASSOC:PDO::FETCH_NUM);
        $stmt -> closeCursor();
        return $arr;
    }
    
    function queryAll($sql,$param=null,$name=true){
        $stmt = $this -> db -> prepare($sql);
        if (!$stmt){
            return null;
        }
        $this->bind_param($stmt,$param);
        $res = $stmt -> execute();
        if(!$res){
            $stmt->closeCursor();
            return null;
        }
        $arr=$stmt->fetchAll($name?PDO::FETCH_ASSOC:PDO::FETCH_NUM);
        $stmt -> closeCursor();
        return $arr;
    }
    
    function querySingle($sql,$param=null,$name=true){
        $stmt = $this -> db -> prepare($sql);
        if (!$stmt){
            return null;
        }
        $this->bind_param($stmt,$param);
        $res = $stmt -> execute();
        if(!$res){
            $stmt->closeCursor();
            return null;
        }
        $arr=$stmt->fetchColumn();
        $stmt -> closeCursor();
        return $arr;
    }
    
    function querySingleAll($sql,$param=null,$name=true){
        $stmt = $this -> db -> prepare($sql);
        if (!$stmt){
            return null;
        }
        $this->bind_param($stmt,$param);
        $res = $stmt -> execute();
        if(!$res){
            $stmt->closeCursor();
            return null;
        }
        $arr=[];
        do{
            $item=$stmt->fetchColumn();
            if($item)
                $arr[]=$item;
        }while($item!==false);
        $stmt -> closeCursor();
        return $arr;
    }

    public function begin() {
        $this -> db -> beginTransaction();
    }

    public function rollback() {
        $this -> db -> rollBack();
    }

    public function commit() {
        $this -> db -> commit();
    }
}

/*
$db=new dbManager("db.json");
$db->exec("CREATE TABLE USER(ID INTEGER PRIMARY KEY NOT NULL)");
$db->exec("INSERT INTO user(ID) VALUES(?)",1);
var_dump($db->query("SELECT * FROM USER WHERE ID=?",1));
var_dump($db->queryAll("SELECT * FROM USER WHERE ID=?",1));
var_dump($db->querySingle("SELECT * FROM USER WHERE ID=?",1));
var_dump($db->querySingleAll("SELECT * FROM USER WHERE ID=?",1));
*/

?>

这是修改为pdo版本的原生db类
导入的json配置文件
{

"dsn":"sqlite:test.db",
"user":"",
"pass":""

}
我这里只是方便前端修改，也可以搞成php文件