How to select multiple where conditions using codeigniter?

问题

my table

This is my table i have to display the data using multiple where conditions. First i select using dms_expire_date,for this i got answer and i am using dms_doc_name in where conditions but i didn't got correct result.

I have tired so far.

]

See this picture if i use "or" in "where" i got testie not within this date.but if i use "and" in "where" i didn't got result for dms_expiry_date

See this picture

i don't know how to do this.please help to solve this problem.

SELECT * FROM `dms_document` WHERE dms_expire_date BETWEEN '2020-05-01' AND '2020-07-16' AND dms_doc_name = '' OR dms_category_id = '' OR dms_subcategory_id=''

I have tired in array also but i didn't result.

$this->db->select('*');
$this->db->join('dms_category as C', 'C.dms_category_id = D.dms_category_id', 'left outer');
$this->db->join('dms_sub_category as S', 'S.dms_subcategory_id = D.dms_subcategory_id', 'left outer');
$this->db->where('dms_expire_date >=', $newstart);
$this->db->where('dms_expire_date <=', $newend);
$this->db->where(array('dms_doc_name' =>$docname,'D.dms_category_id'=>$category,'D.dms_subcategory_id'=>$subcategory));
$data['documents']= $this->db->get('dms_document as D')->result_array();

回答1:

try

SELECT * 
FROM dms_document
WHERE dms_expire_date BETWEEN $newstart AND $newend
AND CASE WHEN $docname IS NULL THEN 1 = 1 ELSE dms_doc_name = $docname END
AND CASE WHEN $category IS NULL THEN 1 = 1 ELSE dms_category_id = $category END 
AND CASE WHEN $subcategory IS NULL THEN 1 = 1 ELSE dms_subcategory_id = $subcategory END

edited. waiting for clearance.

if I get what you mean correctly, it is problem with understanding AND, OR, and the priority with brackets ()

-- if anyone want to use the fiddle, I have created the sample data for this issue

回答2:

You can write OR using CodeIgniter's or_where() (v3 docs) or orWhere() (v4 docs).

//your initial query
$sql = "SELECT
            *
        FROM
            `dms_document`
        WHERE
            dms_expire_date BETWEEN '2020-05-01' AND '2020-07-16'
            AND dms_doc_name = ''
            OR dms_category_id = ''
            OR dms_subcategory_id=''";

//building the same query using CI
$this->db->select('*');
$this->db->from('dms_document');
$this->db->where('dms_expire_date >=', '2020-05-01');
$this->db->where('dms_expire_date <=', '2020-07-16');
$this->db->where('dms_doc_name', '');
$this->db->or_where('dms_category_id', '');
$this->db->or_where('dms_subcategory_id', '');

You can confirm the query this generates by running $this->db->_compile_select(); or $this->db->last_query(); (https://stackoverflow.com/a/6145021/1499877 for reference).

echo '<pre>';
var_dump($sql);
var_dump($this->db->_compile_select());
echo '</pre>';
die();

来源：https://stackoverflow.com/questions/62926797/how-to-select-multiple-where-conditions-using-codeigniter

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mysql

codeigniter