How could I add a new column when reading my data from a database?

How could I add a new column when reading my data from a database?

leelunaaleelunaa Posts: 7Questions: 0Answers: 0

Description of problem:
Hey guys. I'm trying to create a table with a new column that doesn't exist in my original table. I can only insert the data directly into the table after it's generated, but that way I can't reorder the table... :/ (or I'm probably doing something wrong.) What do you guys suggest me to do?

My original table:
The table that I would like to create:
***The extra column on the far right

I've even thought about creating a temporary table with the additional column and the data I want to insert, but I had a problem with the syntax execution, so that's why I'm asking for your help.

Description of problem deeply:
The extra column I want to create will create a 'score system' checking the other columns (except ID column, of course). So, for example, if column 1 ('center') contains the word 'SP', the value to be stored in column 'score' will be 5; otherwise, the value will be 0. And so on.

That way, I would add all these conditions, column by column, and create a score; ordered from highest value to lowest value.

JavaScript Code:

    $(document).ready(function() {
        var table = $('#tabela').DataTable({
            "language": {
                "url": "//cdn.datatables.net/plug-ins/1.11.1/i18n/pt_br.json"
            },
            "processing": true,
            "serverSide": true,
            "order": [
                [0, "asc"]
            ],
            "ajax": {
                url: "fetch.php",
                type: "POST"
            }
        });
    
        function _(element) {
            return document.getElementById(element);
        }
    
        $('#tabela tbody').on('click', 'tr', function() {
            var data = table.row(this).data();
            alert('Você clicou na vaga "' + data[2] + '", do centro "' + data[1] + '" de ID: ' + data[0]);
        });
    
        $(".sidebar-btn").click(function() {
            $(".wrapper").toggleClass("collapse");
        });
    });

PHP:

    <?php
            include('./database_connection.php');
            
            $column = array("id", "centro", "cargo", "dt_abertura");
            
            $query = "SELECT * FROM vagas";
            
            if (isset($_POST["search"]["value"])) {
                $query .= '
                WHERE centro LIKE "%' . $_POST["search"]["value"] . '%" 
                OR cargo LIKE "%' . $_POST["search"]["value"] . '%" 
                OR dt_abertura LIKE "%' . $_POST["search"]["value"] . '%" 
                ';
            }
            
            if (isset($_POST["order"])) {
                $query .= 'ORDER BY ' . $column[$_POST['order']['0']['column']] . ' ' . $_POST['order']['0']['dir'] . ' ';
            } else {
                $query .= 'ORDER BY id DESC ';
            }
            $query1 = '';
            
            if ($_POST["length"] != -1) {
                $query1 = 'LIMIT ' . $_POST['start'] . ', ' . $_POST['length'];
            }
            
            $statement = $connect->prepare($query);
            
            $statement->execute();
            
            $number_filter_row = $statement->rowCount();
            
            $statement = $connect->prepare($query . $query1);
            
            $statement->execute();
            
            $result = $statement->fetchAll();
            
            $data = array();
            
            foreach ($result as $row) {
                $sub_array = array();
                $sub_array[] = $row['id'];
                $sub_array[] = $row['centro'];
                $sub_array[] = $row['cargo'];
                $sub_array[] = $row['dt_abertura'];
                $data[] = $sub_array;
            }
            
            function count_all_data($connect)
            {
                $query = "SELECT * FROM vagas";
                $statement = $connect->prepare($query);
                $statement->execute();
                return $statement->rowCount();
            }
            
            $output = array(
                'draw'   => intval($_POST['draw']),
                'recordsTotal' => count_all_data($connect),
                'recordsFiltered' => $number_filter_row,
                'data'   => $data
            );
            
            echo json_encode($output);

Any help will be appreciated!

Replies

  • kthorngrenkthorngren Posts: 13,786Questions: 25Answers: 3,242

    Sounds like columns.render is what you want to use. See this example of how to access the row data to render "calculated" data into one column.

    Kevin

  • colincolin Posts: 12,613Questions: 0Answers: 2,154

    For the editing components, Editor can do that - see example here,

    Colin

  • leelunaaleelunaa Posts: 7Questions: 0Answers: 0
    edited September 11

    @kthorngren Thanks, the column render solution worked perfectly. Appreciated!
    But, for now, I am getting a new error:

    When I am trying to initialize my table based on the new column ('score'), the table isn't loading correctly:

    JavaScript:

    "columnDefs": [
                {
                    "data" : null,
                    "render": function ( data, type, row ) {
                        if(row[1] == 'SP'){
                            return 5;
                        }
                        else{
                            return 1;
                        }
                        
                    },
                    "targets": 4,
                    "orderable": true,
                }
            ],
            "order": [[4, "desc"]],
    

    I think it's because my $query function isn't "align" with the new column.

    PHP Code:

    if (isset($_POST["order"])) {
        $query .= 'ORDER BY ' . $column[$_POST['order']['0']['column']] . ' ' . $_POST['order']['0']['dir'] . ' ';
    } else {
        $query .= 'ORDER BY id DESC ';
    }
    

    Any help would be appreciated!

  • colincolin Posts: 12,613Questions: 0Answers: 2,154

    You would need to define those columns in the DataTables initialisation - see example here,

    Colin

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