select 与 all 均返回查询数据结果集合
$tag=Tag::select(4);
$tag=Tag::select([1,2,3]);
$tag=Tag::select('1,2,3');
$tag=Tag::all(4);
$tag=Tag::all([1,2,3]);
$tag=Tag::all('1,2,3');
$tag=Tag::where('is_show','in','1,0')->all();
$tag=Tag::where('is_show','in','1,0')->select();
all ()与select()，用法差距不大，all（）底层最终还是调用的select（）方法
/**
* 查找所有记录
* @access public
* @param mixed $data 主键列表或者查询条件（闭包）
* @param array|string $with 关联预查询
* @param bool $cache 是否缓存
* @return static[]|false
* @throws exception\DbException
*/
public function all($data = null, $with = [], $cache = false)
{
if (true === $with || is_int($with)) {
$cache = $with;
$with = [];
}
return $this->parseQuery($data, $with, $cache)->select($data);
}
/**
* 查找记录
* @access public
* @param array|string|Query|\Closure $data
* @return Collection|array|\PDOStatement|string
* @throws DbException
* @throws ModelNotFoundException
* @throws DataNotFoundException
*/
public function select($data = null)
{
if ($data instanceof Query) {
return $data->select();
} elseif ($data instanceof \Closure) {
$data($this);
$data = null;
}
$this->parseOptions();
if (false === $data) {
// 用于子查询 不查询只返回SQL
$this->options['fetch_sql'] = true;
} elseif (!is_null($data)) {
// 主键条件分析
$this->parsePkWhere($data);
}
$this->options['data'] = $data;
$resultSet = $this->connection->select($this);
if ($this->options['fetch_sql']) {
return $resultSet;
}
// 返回结果处理
if (!empty($this->options['fail']) && count($resultSet) == 0) {
$this->throwNotFound($this->options);
}
// 数据列表读取后的处理
if (!empty($this->model)) {
// 生成模型对象
$resultSet = $this->resultSetToModelCollection($resultSet);
} else {
$this->resultSet($resultSet);
}
return $resultSet;
}
