操作类文件
db.class.php
<?phpclass DB_API{ // 数据库表名 protected $table; // 数据库主键 protected $primary = 'id'; // 表前缀 protected $prefix = ''; // WHERE和ORDER拼装后的条件 private $filter = array(); // PDO private $pdo; // PDOStatement private $Statement; // PDO链接数据库 public function __construct($config){ class_exists('PDO') or exit("not found PDO"); try{ $this->pdo = new PDO("mysql:host=".$config['db_host'].";port=".$config['db_port'].";dbname=".$config['db_name'],$config['db_user'], $config['db_pass']); }catch(PDOException $e){ // 数据库无奈链接，如果您是第一次应用，请先配置数据库！ exit($e->getMessage()); } $this->prefix = $config['db_prefix']; $this->pdo->exec("SET NAMES UTF8"); } // 配置表信息 public function set_table($table=null,$primary='id'){ if($table==null){ exit('Not found Table');} $this->primary = $primary; $this->table = $this->prefix.$table; return $this; } // 获取数据 public function getData($sql) { if(!$result = $this->query($sql))return array(); if(!$this->Statement->rowCount())return array(); $rows = array(); while($rows[] = $this->Statement->fetch(PDO::FETCH_ASSOC)){} $this->Statement=null; array_pop($rows); return $rows; } // 查问数据条数 public function getCount($conditions){ $where = ''; if(is_array($conditions)){ $join = array(); foreach( $conditions as $key => $value ){ $value = '\''.$value.'\''; $join[] = "{$key} = {$value}"; } $where = "WHERE ".join(" AND ",$join); }else{ if(null != $conditions)$where = "WHERE ".$conditions; } $sql = "SELECT count(*) as Frcount FROM {$this->table} {$where}"; $result = $this->getData($sql); return $result[0]['Frcount']; } // 获取繁多字段内容 public function getField($where=null,$fields=null){ if( $record = $this->findAll($where, null, $fields, 1) ){ $res = array_pop($record); return $res[$fields]; }else{ return FALSE; } } // 递增数据 public function goInc($conditions,$field,$vp=1){ $where = ""; if(is_array($conditions)){ $join = array(); foreach( $conditions as $key => $value ){ $value = '\''.$value.'\''; $join[] = "{$key} = {$value}"; } $where = "WHERE ".join(" AND ",$join); }else{ if(null != $conditions)$where = "WHERE ".$conditions; } $values = "{$field} = {$field} + {$vp}"; $sql = "UPDATE {$this->table} SET {$values} {$where}"; return $this->pdo->exec($sql); } // 递加 public function goDec($conditions,$field,$vp=1){ return $this->goInc($conditions,$field,-$vp); } // 批改数据 public function update($conditions,$row) { $where = ""; $row = $this->__prepera_format($row); if(empty($row)){ return FALSE; } if(is_array($conditions)){ $join = array(); foreach( $conditions as $key => $condition ){ $condition = '\''.$condition.'\''; $join[] = "{$key} = {$condition}"; } $where = "WHERE ".join(" AND ",$join); }else{ if(null != $conditions){ $where = "WHERE ".$conditions; } } foreach($row as $key => $value){ $value = '\''.$value.'\''; $vals[] = "{$key} = {$value}"; } $values = join(", ",$vals); $sql = "UPDATE {$this->table} SET {$values} {$where}"; //echo $sql.'<br/>'; $res = $this->pdo->exec($sql); if($res){ return $res; }else{ var_dump($this->pdo->errorInfo()); } } // 查问所有 public function findAll($conditions=null,$order=null,$fields=null,$limit=null) { $where = ''; if(is_array($conditions)){ $join = array(); foreach( $conditions as $key => $value ){ $value = '\''.$value.'\''; $join[] = "{$key} = {$value}"; } $where = "WHERE ".join(" AND ",$join); }else{ if(null != $conditions)$where = "WHERE ".$conditions; } if(is_array($order)){ $where .= ' ORDER BY '; $where .= implode(',', $order); }else{ if($order!=null)$where .= " ORDER BY ".$order; } if(!empty($limit))$where .= " LIMIT {$limit}"; $fields = empty($fields) ? "*" : $fields; $sql = "SELECT {$fields} FROM {$this->table} {$where}"; return $this->getData($sql); } // 查问一条 public function find($where=null,$order=null,$fields=null,$limit=1) { if( $record = $this->findAll($where, $order, $fields, 1) ){ return array_pop($record); }else{ return FALSE; } } // 执行SQL语句并查看是否谬误 public function query($sql){ $this->filter[] = $sql; $this->Statement = $this->pdo->query($sql); if ($this->Statement) { return $this; }else{ $msg = $this->pdo->errorInfo(); if($msg[2]) exit('数据库谬误：' . $msg[2] . end($this->filter)); } } // 执行SQL语句函数 public function findSql($sql) { return $this->getData($sql); } // 依据条件 (conditions) 删除 public function delete($conditions) { $where = ""; if(is_array($conditions)){ $join = array(); foreach( $conditions as $key => $condition ){ $condition = '\''.$condition.'\''; $join[] = "{$key} = {$condition}"; } $where = "WHERE ( ".join(" AND ",$join). ")"; }else{ if(null != $conditions)$where = "WHERE ( ".$conditions. ")"; } $sql = "DELETE FROM {$this->table} {$where}"; return $this->pdo->exec($sql); } // 新增数据 public function add($row) { if(!is_array($row)){ return FALSE; } $row = $this->__prepera_format($row); if(empty($row)){ return FALSE; } foreach($row as $key => $value){ $cols[] = $key; $vals[] = '\''.$value.'\''; } $col = join(',', $cols); $val = join(',', $vals); $sql = "INSERT INTO {$this->table} ({$col}) VALUES ({$val})"; if( FALSE != $this->pdo->exec($sql) ){ if( $newinserid = $this->pdo->lastInsertId() ){ return $newinserid; }else{ $a=$this->find($row, "{$this->primary} DESC",$this->primary); return array_pop($a); } } return FALSE; } private function __prepera_format($rows) { $stmt = $this->pdo->prepare('DESC '.$this->table); $stmt->execute(); $columns = $stmt->fetchAll(PDO::FETCH_COLUMN); $newcol = array(); foreach( $columns as $col ){ $newcol[$col] = null; } return array_intersect_key($rows,$newcol); }}实例化类
<?phpheader("Content-type:text/html;charset=utf-8");// 引入类include './db.class.php';// 数据库配置$config = [ 'db_host' => 'localhost', // 数据库地址 'db_port' => 3306, // 默认mysql数据库端口 'db_name' => 'test', // 数据库名字 'db_user' => 'root', // 数据库用户名 'db_pass' => 'root', // 数据库明码 'db_prefix' => '', // 表前缀]; // 实例化类$db = new DB_API($config); // 表名$article = $db->set_table('article'); // 新增数据$newdata = ['title'=>'this is a title'];$r = $article->add($newdata);if($r){ echo '新增胜利！';}else{ echo '操作失败！';}// 查问数据$where = ['id'=>3];$find = $article->find($where); //查问一条数据$find = $article->findAll($where); // 查问多条数据print_r($find); // 更新数据$where = ['title'=>'hello world666'];$update = $article->update(['id'=>1],$where);if($update ){ echo '更新胜利！'; // 查问并打印 $newdata = $article->find('id=1'); print_r($newdata);}else{ echo '更新失败！';} // 删除数据$where = ['id'=>1];$del = $article->delete($where);if($del){ echo '删除胜利！';}else{ echo '删除失败！';} // 获取符合条件的记录数$where = ['author'=>'TANKING'];$count = $article->getCount($where);echo $count; // 执行原生SQL语句$sql = 'select * from article where id=3';$lists = $article->findSql($sql);print_r($lists); // 依据条件查问出对应的字段的值$where = ['id'=>1];$res = $article->getField($where,'title');if ($res) { echo $res;}else{ echo "没有数据";}// 高级查问// $conditions查问条件// $order排序办法// $fields指定字段// $limit查问条数$res = $article->findAll($conditions=null,$order='id asc',$fields=null,$limit=null);if ($res) { print_r($res);}else{ print_r("没有数据");}Author:TANKING