如何解决Laravel 查询构建器调用成员函数 where() on null
我正在尝试进行验证以检查值不为空。但是在执行时显示错误。代码如下:
$validation_query = DB::table('immunizations')->whereNull('deleted_at');
foreach ($fileheaders as $valkey => $valvalue) {
foreach($valvalue as $vlrw=>$valrowval) {
if($schema[$immunization_mapping[$vlrw]->field_id] == 'personnel_id'){
$validation_query = $validation_query->where('personnel_id','=',$valrowval);
}
if($schema[$immunization_mapping[$vlrw]->field_id] == 'immunization_date'){
$validation_query = $validation_query->where('immunization_date','>=',$valrowval);
}
$validation_query = $validation_query->where('immunization_type_id',$immunization_type_id);
$validation_query = $validation_query->first();
if ($validation_query != '' && $validation_query->id != '') {
$err = 1;
}
}
$err_array['duplication'][] = $valkey;
$valcnt++;
}
这个循环有什么问题吗?
解决方法
只需在 foreach 的每个循环中为您的查询提供一个适当的初始值:
foreach ($fileheaders as $valkey => $valvalue) {
foreach($valvalue as $vlrw=>$valrowval) {
$validation_query = DB::table('immunizations')->whereNull('deleted_at');
if($schema[$immunization_mapping[$vlrw]->field_id] == 'personnel_id'){
$validation_query = $validation_query->where('personnel_id','=',$valrowval);
}
if($schema[$immunization_mapping[$vlrw]->field_id] == 'immunization_date'){
$validation_query = $validation_query->where('immunization_date','>=',$valrowval);
}
$validation_query = $validation_query->where('immunization_type_id',$immunization_type_id);
$validation_query = $validation_query->first();
if ($validation_query != '' && $validation_query->id != '') {
$err = 1;
}
}
$err_array['duplication'][] = $valkey;
$valcnt++;
}
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