/**
* 查找单条记录
* @access public
* @param array|string|Query|\Closure $data
* @return array|false|\PDOStatement|string|Model
* @throws DbException
* @throws ModelNotFoundException
* @throws DataNotFoundException
*/
public function find($data = null)
{
if ($data instanceof Query) {
return $data->find();
} elseif ($data instanceof \Closure) {
call_user_func_array($data, [&$this]);
$data = null;
}
// 分析查询表达式
$options = $this->parseExpress();
if (!is_null($data)) {
// AR模式分析主键条件
$this->parsePkWhere($data, $options);
}
$options['limit'] = 1;
$result = false;
if (empty($options['fetch_sql']) && !empty($options['cache'])) {
// 判断查询缓存
$cache = $options['cache'];
if (true === $cache['key'] && !is_null($data) && !is_array($data)) {
$key = 'think:' . $options['table'] . '|' . $data;
} else {
$key = is_string($cache['key']) ? $cache['key'] : md5(serialize($options));
}
$result = Cache::get($key);
}
if (!$result) {
// 生成查询SQL
$sql = $this->builder()->select($options);
// 获取参数绑定
$bind = $this->getBind();
if ($options['fetch_sql']) {
// 获取实际执行的SQL语句
return $this->connection->getRealSql($sql, $bind);
}
// 执行查询
$result = $this->query($sql, $bind, $options['master'], $options['fetch_class']);
if ($result instanceof \PDOStatement) {
// 返回PDOStatement对象
return $result;
}
if (isset($cache)) {
// 缓存数据
if (isset($cache['tag'])) {
Cache::tag($cache['tag'])->set($key, $result, $cache['expire']);
} else {
Cache::set($key, $result, $cache['expire']);
}
}
}
// 数据处理
if (!empty($result[0])) {
$data = $result[0];
if (!empty($this->model)) {
// 返回模型对象
$model = $this->model;
$data = new $model($data);
$data->isUpdate(true, isset($options['where']['AND']) ? $options['where']['AND'] : null);
if ($this->allowField) {
$data->allowField($this->allowField);
}
// 关联查询
if (!empty($options['relation'])) {
$data->relationQuery($options['relation']);
}
if (!empty($options['with'])) {
// 预载入
$data->eagerlyResult($data, $options['with'], is_object($result) ? get_class($result) : '');
}
}
} elseif (!empty($options['fail'])) {
$this->throwNotFound($options);
} else {
$data = null;
}
return $data;
}
