Extract Pdf from MySql Dump Saved as Text

Question

I have a MySql database dump saved as a text file and am trying to find a way of extracting the indivdual pdf documents stored in one of the tables. All my research online so far has drawn a blank.

The data in the exported text file is in the following format:

DROP TABLE IF EXISTS `codocs`;

CREATE TABLE `codocs` (
  `ID` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `COCODE` varchar(8) NOT NULL,
  `FILENAME` varchar(100) NOT NULL,
  `DATE` date NOT NULL,
  `USER` varchar(10) NOT NULL,
  `DOCUMENT` mediumblob NOT NULL,
  PRIMARY KEY (`ID`),
  KEY `oc` (`COCODE`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

LOCK TABLES `codocs` WRITE;
/*!40000 ALTER TABLE `codocs` DISABLE KEYS */;

INSERT INTO `codocs` (`ID`, `COCODE`, `FILENAME`, `DATE`, `USER`, `DOCUMENT`)
VALUES
    (1,’123456’,’document-2016-01-18.pdf','2016-01-21’,’user1’,X’8CB7638C2840B32D3AB66DDBB66DDBB66DDBB6BDC7B66DDBB6B1C7336F9F736EDECD4DBE1FE7477752D555ABBB562A59D5A40A2262B48C74CC0450A48747734B04508C040C04F64656 …
D2495CC3D8C1FCB8845D1D6F6C717E5EFB493B431B1250782FFFC12FD518D0E4EBF951D3B98F3C7971C1235F54B793172A427FF0F'),
    (2,’234567’,’document-2016-01-18.pdf','2016-01-22’,’user1’,X’8CF763702E4EF02D0AC7B6ED64C7B66DDB7E62DBB6EDECD8C98E6DDBB66D3B797FE79C5BEFAD5BF5FF70AA66BAAA7B7AD674AD999A5A4DAE282A4EC744CF4204437E7038BB4804C344C448646F6C4504C3CB4B04C3A0EAE900206210317231B2B137FFCF57343207381331FF9 …
971C1235F54B793172A427FF0F'),
    (3,’…

Any assistance would be greatly appreciated.

Update: 20220112

I have since restored the database from the sql dump and have subsequently created the following php files to try to display the pdfs stored in the codocs table:

db.php - contains the mysql database connection - this is working

records_list.php - lists all the records in the codocs table including a button on each returned row to view the stored pdf - this is working

view_pdf.php - receives the ID for the record clicked on from the records_list.php file and passes the selected record ID to the SELECT statement and displays the correct (presumably, as different data is returned for each separate record clicked on in the records_list.php file) raw mediumblob code stored in the database - this is not working as intended

The following code is for the view_pdf.php file:

<?php
    $pdf_id = $_REQUEST['pdfID'];
    require_once "db.php";
    if(isset($pdf_id)) {
        $myID = $pdf_id;
        $sql = "select * from codocs where ID='" . $myID . "'";
        if (!$result=mysqli_query($con, $sql)){
        echo mysqli_error($con);
        } else {
            $row = mysqli_fetch_array($result);
            echo $row["DOCUMENT"];
            mysqli_close($con);
        }
    }
?>

As mentioned just the raw mediumblob data appears to be being returned.

If the following line is replaced:

            echo $row["DOCUMENT"];

with

            echo  '<object data="data:application/pdf;base64,'.base64_decode($row['DOCUMENT']).'" type="application/pdf" style="height:1000px;width:100%"></object>';

or

            echo base64_decode($row['DOCUMENT']);

it makes no difference. Raw code continues to be returned. If the original line of code referred to above is replaced with

            header('Content-type: application/pdf'); 
            echo $row["DOCUMENT"];

a downloadable pdf is offered and can be saved but is unreadable with the following warning: "This PDF document might not be displayed correctly." and the following error: "Unable to open document file:///...document.pdf. File type unknown (application/octet-stream) is not supported."

Can anyone advise how the code above can be amended to allow the retrieval of the stored pdf files?

Is the X that precedes the single quotations marks shown surrounding the mediumblob data in the sql dump file of any significance?

Any assistance would be greatly appreciated.

Further Update 20220112:

The following are example unreadable pdf restores but generate 'pdf' files of differing sizes:

Record 554:

Using the following replacement code:

            header('Content-type: application/pdf'); 
            echo $row["DOCUMENT"];

generates an unreadable file 82.2Kb in size.

Using the following replacement code:

            header('Content-type: application/pdf'); 
            echo  '<object data="data:application/pdf;base64,'.base64_decode($row['DOCUMENT']).'" type="application/pdf" style="height:1000px;width:100%"></object>';

generates an unreadable file 15.6Kb in size.

Using the following replacement code:

            header('Content-type: application/pdf'); 
            echo  '<object data="data:application/pdf;base64,'.base64_encode($row['DOCUMENT']).'" type="application/pdf" style="height:1000px;width:100%"></object>';

generates an unreadable file 109.7Kb in size.

Any thoughts on helping to resolve the issue would be very welcome.