Codeigniter 4 查询 IF ISNULL

Question

I am migragint from Codeigniter 3 to Codeigniter 4 and the next query is problematic to me.

In Codeigniter 3, the query was:

$this->db->query("UPDATE myTable SET data = '$data', 
                                myData = IF ( ISNULL(myData), '$state', CONCAT('$state', '-', myData) ) 
                        WHERE id = '$id'");

I tried to change this with the next format:

$data = array(
            'myData' => "IF( ISNULL(myData), " . $state. ", CONCAT(" . $state. ", '-', myData')")
        );

However, the function updates the content of $myData like a string "IF( ISNULL(myData), ". stateOfExample. ", CONCAT(". stateOfExample. ", '-', myData')".

I have looked into the CI4 documentation but i have not find the way to develop this query. I find the way to do that with the where() CI function, but i think is not the best way to do that.

Thanks in advance

Answer 1

If you put SQL functions in data, codeigniter won't understand that those are functions. It just adds them as string.

Put IF , CONCAT , ISNULL in sql and use data array just for variables.

$this->db->query("UPDATE myTable SET data = ?, 
    myData = IF ( ISNULL(myData), ?, CONCAT(?, '-', myData) ) 
    WHERE id = ?", array($data, $state, $state, $id));