How to write union query in Laravel? - php

Question

I'm using laravel 5.0 and I have mysql query:
SELECT surat_masuk.id_surat,
surat_masuk.nomor_surat
FROM surat_masuk
WHERE ! EXISTS (SELECT *
FROM file_replace
WHERE id_surat_lama = surat_masuk.id_surat)
AND surat_masuk.id_jenis_surat = '6'
AND surat_masuk.deleted = '0'
UNION
SELECT id_surat_lama
FROM file_replace
WHERE id_surat_baru = '38'
And I write that in my laravel code into:
$nomor_surat1 = DB::table('surat_masuk')->select('id_surat', 'nomor_surat')
->where('id_jenis_surat', '=', $id_jenis_surat)
->where(function ($query) {
$query->where('masa_berlaku_to', '>=', date('Y-m-d'))
->orwhere('masa_berlaku_to', '=', '0000-00-00');
})
->whereExists(function ($query) {
$query
->from('file_replace')
->where('id_surat_lama', '==', 'surat_masuk.id_surat');
})
->where('deleted', '=', '0');
$nomor_surat = DB::table('file_replace')->join('surat_masuk', 'file_replace.id_surat_lama', '=', 'surat_masuk.id_surat')
->select('id_surat_lama', 'nomor_surat')
->where('id_surat_baru', '=', $id_surat_baru)
->union($nomor_surat1)->get();
But I've got nothing showed. Do you know where is the mistakes?

Answer 1

Well, I finally using raw query..
$results = DB::select( DB::raw("SELECT * FROM some_table WHERE some_col = '$someVariable'") );

Answer 2

Please see the answer, that might help you..
SELECT surat_masuk.id_surat,
surat_masuk.nomor_surat
FROM surat_masuk
WHERE ! EXISTS (SELECT *
FROM file_replace
WHERE id_surat_lama = surat_masuk.id_surat)
AND surat_masuk.id_jenis_surat = '6'
AND surat_masuk.deleted = '0'
UNION
SELECT id_surat_lama
FROM file_replace
WHERE id_surat_baru = '38'
//converted to laravel elequent query.
$first_sql=DB::table('surat_masuk as sm1')
->whereNotExists(function($query) {
$query->from('file_replace as fr1')
->where('fr1.id_surat_lama','sm1.id_surat');
})->where('sm1.id_jenis_surat',6)
->where('sm1.deleted',0)
->select('sm1.id_surat', 'sm1.nomor_surat' );
//will return an elequent object, append '->get()' to see the output seperately
$actual_result=DB::table('file_replace as fr2')
->where('fr2.id_surat_baru',38)
->select('fr2.id_surat_lama')
->union($first_sql)
->get();
//will return an array of result set