PHP的PDO常用类库实例分析

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<"INSERT INTO {$tName} ({$fields}) VALUES ({$vals})";
      if (!$is_lastInsertId) {
        $row = $this->_db->exec($this->_sql);
        return $row;
      } else {
        $this->_db->exec($this->_sql);
        $lastId = (int)$this->_db->lastInsertId();
        return $lastId;
      }
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 数据库修改操作
   * @param string $tName 表名
   * @param array $field 字段数组
   * @param array $val 值数组
   * @param string $condition 条件
   * @return int 受影响的行数
   */
  public function update($tName, $fieldVal, $condition) {
    try {
      if (!is_array($fieldVal) || !is_string($tName) || !is_string($condition))
        exit($this->getError(__FUNCTION__, __LINE__));
      $tName = $this->formatTabName($tName);
      $upStr = '';
      foreach ($fieldVal as $k=>$v) {
        $upStr .= '`'.$k . '`=' . '\'' . $v . '\'' . ',';
      }
      $upStr = rtrim($upStr, ',');
      $this->_sql = "UPDATE {$tName} SET {$upStr} WHERE {$condition}";
      $row = $this->_db->exec($this->_sql);
      return $row;
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 数据库删除操作（注：必须添加 where 条件）
   * @param string $tName 表名
   * @param string $condition 条件
   * @return int 受影响的行数
   */
  public function del($tName, $condition) {
    try {
      if (!is_string($tName) || !is_string($condition))
        exit($this->getError(__FUNCTION__, __LINE__));
      $tName= $this->formatTabName($tName);
      $this->_sql = "DELETE FROM {$tName} WHERE {$condition}";
      $row = $this->_db->exec($this->_sql);
      return $row;
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 返回表总个数
   * @param string $tName 表名
   * @param string $condition 条件
   * @return int
   */
  public function total($tName, $condition='') {
    try {
      if (!is_string($tName))
        exit($this->getError(__FUNCTION__, __LINE__));
      $tName = $this->formatTabName($tName);
      $this->_sql = "SELECT COUNT(*) AS total FROM {$tName}" .
      ($condition=='' "DELETE FROM {$tName} WHERE {$field} IN ({$delStr})";
      $row = $this->_db->exec($this->_sql);
      return $row;
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 获取表格的最后主键（注：针对 INT 类型）
   * @param string $tName 表名
   * @return int
   */
  public function insertId($tName) {
    try {
      if (!is_string($tName))
        exit($this->getError(__FUNCTION__, __LINE__));
      $this->_sql = "SHOW TABLE STATUS LIKE '{$tName}'";
      $result = $this->_db->query($this->_sql);
      $insert_id = 0;
      foreach ($result as $v) {
        $insert_id = $v['Auto_increment'];
      }
      return (int)$insert_id;
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 检查数据是否已经存在（依赖条件）
   * @param string $tName 表名
   * @param string $field 依赖的字段
   * @return bool
   */
  public function exists($tName, $condition) {
    try {
      if (!is_string($tName) || !is_string($condition))
        exit($this->getError(__FUNCTION__, __LINE__));
      $tName = $this->formatTabName($tName);
      $this->_sql = "SELECT COUNT(*) AS total FROM {$tName} WHERE {$condition}";
      $result = $this->_db->query($this->_sql);
      foreach ($result as $v) {
         $b = $v['total'];
      }
      if ($b) {
        return true;
      } else {
        return false;
      }
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 检查数据是否已经存在（依赖 INT 主键）
   * @param string $tName 表名
   * @param string $primary 主键
   * @param int $id 主键值
   * @return bool
   */
  public function existsByPK($tName, $primary, $id) {
    try {
      if (!is_string($tName) || !is_string($primary)
      || !is_int($id))
        exit($this->getError(__FUNCTION__, __LINE__));
      $tName = $this->formatTabName($tName);
      $this->_sql = "SELECT COUNT(*) AS total FROM {$tName} WHERE {$primary} = ". $id;
      $result = $this->_db->query($this->_sql);
      foreach ($result as $v) {
         $b = $v['total'];
      }
      if ($b) {
        return true;
      } else {
        return false;
      }
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 预处理删除（注：针对主键为 INT 类型，推荐使用）
   * @param string $tName 表名
   * @param string $primary 主键字段
   * @param int or array or string $ids 如果是删除一条为 INT，多条为 array，删除一个范围为 string
   * @return int 返回受影响的行数
   */
  public function delByPK($tName, $primary, $ids, $mult=FALSE) {
    try {
      if (!is_string($tName) || !is_string($primary)
      || (!is_int($ids) && !is_array($ids) && !is_string($ids))
      || !is_bool($mult)) exit($this->getError(__FUNCTION__, __LINE__));
      $tName = $this->formatTabName($tName);
      $stmt = $this->_db->prepare("DELETE FROM {$tName} WHERE {$primary}=");
      if (!$mult) {
        $stmt->bindParam(1, $ids);
        $row = $stmt->execute();
      } else {
        if (is_array($ids)) {
          $row = 0;
          foreach ($ids as $v) {
            $stmt->bindParam(1, $v);
            if ($stmt->execute()) {
              $row++;
            }
          }
        } elseif (is_string($ids)) {
          if (!strpos($ids, '-'))
            exit($this->getError(__FUNCTION__, __LINE__));
          $split = explode('-', $ids);
          if (count($split)!=2 || $split[0]>$split[1])
            exit($this->getError(__FUNCTION__, __LINE__));
          $i = null;
          $count = $split[1]-$split[0]+1;
          for ($i=0; $i<$count; $i++) {
            $idArr[$i] = $split[0]++;
          }
          $idStr = '';
          foreach ($idArr as $id) {
            $idStr .= $id . ',';
          }
          $idStr = rtrim($idStr, ',');
          $this->_sql ="DELETE FROM {$tName} WHERE {$primary} in ({$idStr})";
          $row = $this->_db->exec($this->_sql);
        }
      }
      return $row;
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 返回单个字段数据或单条记录
   * @param string $tName 表名
   * @param string $condition 条件
   * @param string or array $fields 返回的字段，默认是*
   * @return string || array
   */
  public function getRow($tName, $condition='', $fields="*") {
    try {
      if (!is_string($tName) || !is_string($condition)
      || !is_string($fields) || empty($fields))
         exit($this->getError(__FUNCTION__, __LINE__));
      $tName = $this->formatTabName($tName);
      $this->_sql = "SELECT {$fields} FROM {$tName} ";
      $this->_sql .= ($condition=='' "WHERE {$condition}") . " LIMIT 1";
      $sth = $this->_db->prepare($this->_sql);
      $sth->execute();
      $result = $sth->fetch(PDO::FETCH_ASSOC);
      if ($fields === '*') {
        return $result;
      } else {
        return $result[$fields];
      }
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 返回多条数据
   * @param string $tName 表名
   * @param string $fields 返回字段，默认为*
   * @param string $condition 条件
   * @param string $order 排序
   * @param string $limit 显示个数
   * @return PDOStatement
   */
  public function getAll($tName, $fields='*', $condition='', $order='', $limit='') {
    try {
      if (!is_string($tName) || !is_string($fields)
      || !is_string($condition) || !is_string($order)
      || !is_string($limit))
        exit($this->getError(__FUNCTION__, __LINE__));
      $tName = $this->formatTabName($tName);
      $fields = ($fields=='*' || $fields=='') " WHERE ". $condition ;
      $order = $order=='' " ORDER BY ". $order;
      $limit = $limit=='' " LIMIT ". $limit;
      $this->_sql = "SELECT {$fields} FROM {$tName} {$condition} {$order} {$limit}";
      $sth = $this->_db->prepare($this->_sql);
      $sth->execute();
      $result = $sth->fetchAll(PDO::FETCH_ASSOC);
      return $result;
    } catch (PDOException $e) {
      exit($e->getMessage());
    }
  }
  /**
   * 格式化数组（表结构和值）
   * @param array $field
   * @param bool $isField
   * @return string
   */
  private function formatArr($field, $isField=TRUE) {
    if (!is_array($field)) exit($this->getError(__FUNCTION__, __LINE__));
    $fields = '';
    if ($isField) {
      foreach ($field as $v) {
        $fields .= '`'.$v.'`,';
      }
    } else {
      foreach ($field as $v) {
        $fields .= '\''.$v.'\''.',';
      }
    }
    $fields = rtrim($fields, ',');
    return $fields;
  }
  /**
   * 格式化问号
   * @param int $count 数量
   * @return string 返回格式化后的字符串
   */
  private function formatMark($count) {
    $str = '';
    if (!is_int($count)) exit($this->getError(__FUNCTION__, __LINE__));
    if ($count==1) return '"red">'. $line .'</font> ERROR!';
  }
  /**
   * 处理表名
   * @param string $tName
   * @return string
   */
  private function formatTabName($tName) {
    return '`' . trim($tName, '`') . '`';
  }
  /**
   * 析构方法
   */
  public function __destruct() {
    $this->_db = null;
  }
}




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