I execute a postgresql query to a database using PDO and I get back as repsonse strings in the form of:
POINT(23.7336253085595 38.0002872112492)
How can I get the numbers of these strings and store them into to different variables?
That's my code in order to send the query question:
include 'postgreConnect.php';
$maxGid = 1084;
for ($rowPostGis=1; $rowPostGis<=$maxGid;$rowPostGis++){
$stmt = $dbconn->prepare("SELECT ST_AsText(ST_Transform(geom, 4326)) AS geom FROM part_athens_centroids WHERE gid = :rowPostGis;");
$stmt->execute(array('rowPostGis' => $rowPostGis));
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$geom = $row['geom'];
echo($geom);
//echo($geom);
}
}
I would look into http://php.net/manual/en/function.explode.php this will convert your string into an array of strings that you can use http://php.net/manual/en/function.intval.php to convert each string to an int. You may need to crop the query result down to just the numbers for that use http://php.net/manual/en/function.substr.php.
Related
I can't get this Perl code to return true integer values for integers in the table. The MySQL table columns are correctly specified as integers, yet the JSON output here wraps all query values in quotes. How can I correctly preserve data-types (esp. integers and boolean values) as specified?
use strict;
use warnings;
use DBI;
use JSON;
my $sth = "SELECT id, name, age FROM table";
my $data = $dbh->selectall_arrayref($sth, {Slice => {}});
my $response = encode_json($data);
print $response;
## outputs: {"id":"1","name":"Joe Blodge","age":"42"}
What am I doing wrong here? How can I get this to output the correctly formatted JSON:
{"id":1,"name":"Joe Blodge","age":42}
DBD::mysql returns all results as strings (see https://github.com/perl5-dbi/DBD-mysql/issues/253). Normally Perl doesn't care, encoding to JSON is one of the few times when it matters. You can either use Cpanel::JSON::XS::Type to provide type declarations for your JSON structure:
use Cpanel::JSON::XS;
use Cpanel::JSON::XS::Type;
my $response = encode_json($data, {id => JSON_TYPE_INT, name => JSON_TYPE_STRING, age => JSON_TYPE_INT});
or you can go through and numify the appropriate elements before JSON encoding.
$data->{$_} += 0 for qw(id age);
It is possible to check the type (as indicated by MySQL) of each returned column, if you construct and execute your query using a statement handle then the type will be available as an array in $sth->{TYPE}, but this is pretty complex and may not be reliable.
In MySQL, I have a field name postcodes and the type is LONGTEXT. It stores several postcodes being separated by comma. How would I retrieve that and store it as an array for other use ?
you can use the PHP method explode().
one think you can't do, is to do a where x = x on it in the database.
In the model, you can set the mutator methods:
public function getPostcodesAttribute($value) {
return explode(',',$value);
}
public function setPostcodesAttribute($value) {
$this->attributes['postcodes'] = implode(',',$value);
}
Lets say that you have the result stored in a string like this:
$s = "6000,5447"; //$s = $array->postcodes;
you can get the each value on an index in an array using this:
$values= explode(",", $s);
echo $values[0]; // 6000
Or even better.. you can store it as json, and retrieve it as json in array format.
Store it as a JSON field in MySQL, Laravel encode and decode them when you retrieve and save them respectively
in your migration
$table->json('field_name');
then in the model
protected $json = ['field_name'];
then whenever you access the field, laravel will convert it to an array for you, you don't have to call any explicit methods.
Doc - https://laravel.com/docs/5.7/eloquent-mutators#attribute-casting
// the final array all the post codes are collected.
$postCodes = [];
foreach (Model::pluck('postcodes') as $stringCodes)
foreach (explode(',', $stringCodes) as $postCode) $postCodes[] = $postCode;
Can someone help me convert this query so that my result set is in different format?
$sessions = new Session();
$results = $sessions->where('session_status', $status)->where('application_period_id', (int) ApplicationPeriod::all()->last()->id)->get()->pluck('speaker_id');
$speakers = Speaker::whereIn('id', $results)
->with('session.audiancesession.audiances')
->with('session.subjectsession.subjects')
->with(['session' =>
function ($query) use($status) {
$query->where('session_status', '=', $status);
}])->orderBy('last_name')->get();
This is requested via Ajax(axios)... Now this is how result is formatted:
Obj->data(array of objects)->[0]->name
->address
->session(array of objects)
->[0]->time
->fee
My issue is that my session parameter is array and there can only ever be (1) so I don't need to to be an array and I would like to have object (json) instead.
Thank you!
You might have more success if you change your client-side code to work with an array of sessions each session having its speaker, that means your original query would be like
$sessions = Sessions::with([
'speaker', 'audiancesession.audiances', 'subjectsession.subjects'
])->where('application_period_id', (int) ApplicationPeriod::orderBy('id','DESC')->first())->get();
Note the order by -> first in the ApplicationPeriod makes it so you don't have to get all application periods from the database to memory.
Then your client side should handle an array of sessions.
You can transform the above slightly using to get a similar result to what you need:
$speakers = $sessions->map(function ($session) {
$speaker = collect($session->speaker->toArray());
$speaker->put('session', collect($session->toArray())->except('speaker'));
return $speaker;
})->orderBy('last_name','DESC');
Though I wouldn't guarantee the result here as I've not tested it on your (complex looking) data.
I need an sql select statement to retrieve 04:30 and test.zip from this string:
{"TIME":"04:30","DATE":"11\/25\/2013","FILENAME":["test.zip"]}
use this \[(.*?)\]
it return value between [ and ]
and for 04:30 use TIME":(.*?),
it return value after "TIME":
Can't you just decode it and use PHP? (assuming you can't change the way it's stored in the db)
<?php
$str = '{"TIME":"04:30","DATE":"11/25/2013","FILENAME":["test.zip"]}';
$o = json_decode($str);
$time = $o->TIME;
$file = $o->FILENAME[0];
var_dump($time); //"04:30"
var_dump($file); //"test.zip"
Regex replaces etc in MySQL require a UDF (user-defined function) mysql-udf-regexp
If none of the above are viable solutions (change DB structure, do it with PHP, use a MySQL UDF), you'll need to get creative. It would require a known, static format of that string, but you could replace some parts and substring others. For example:
SELECT SUBSTRING(REPLACE(`column_name`,'{"TIME":"',''),1,5) AS `time` FROM `table_name`
File is more complex, this example assuming only one filename in the array
SELECT REPLACE(SUBSTRING(`column_name`,LOCATE('"FILENAME":["',`column_name`)+13),'"]}','') AS `file` FROM `table_name`
Those two field selections get 04:30 and test.zip respectively (you can of course use those functions in the same statement, rather than separately like I have, by comma separating them)
try {
$q = $conn->prepare("DESCRIBE delete_subscriber");
$q->execute();
$tableFieldDS = $q->fetchAll(PDO::FETCH_COLUMN);
}
This code is to fetch the column name , so i am wondering are there any similar function i can use to get an array of the column data type? Thank you.