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Playing with Neo4j ­-[:USING]­⇒ PHP

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Aldo will of social never so that users can be friends of of the universe they can follow each other right so like posts and share them you know this from Facebook with the but so I believe this relations becomes quite hard on the relational database that's something that's tricky because relational databases make it sometimes hard to build direction for
this we 1 probably you know graph database so what is a
graph database quite simple and all data stored in the graph and in this regard notes which have properties between the nodes we have relations and their relations can also properties the the quite simple tools to organize data but the build complex relations from
these social network example such a graph can look like this in the example where we have here are my notes and the relations between the nodes the some and orange and posts and they but this is an actual of the of the new for chair weapons face but more on this later some what is
the 48 In fact the is a
graph database it is highly scalable robust fully assume that stores state and graph yeah the way to the
features of the approaches you as I already said it's a based on the graph model it's fully reliable it's a scalable up to almost they got and other course component of for paralanguage used to iterate over the graphs store data and and the probably run a select queries and results also quite powerful REST interface the use of the come on the way to talk to me forgery is probably Charlie that's pitch period police RF interfaces ceiling so let's 1st
look at the web interface which is quite powerful like this
the so far I've personally affronted worriedly we have here but not on that the highlighted input line for a set of query the CEO of this site Caroline it's will follow and here is an example of an empty results and real results at 2 nodes only we also have a no labels near for example so every node can have label and can use of like a type but that's because your for chains Kemalist In fact we have no schema about that we can find nodes and we can apply the notes 2nd we also have different relationship types I should questions for and is that there are so many variables that you want to 1 of the cases all and so that is not recognizing of and you basically based on all 1 the question was that there there are some of a graph databases and what's the key points taking chain and there are all the graph databases for example at time being this becoming very popular a set of graph database based on C job there are some other special can I tend not list them all the the the main points that had to be a forgery is is if it is very well document will have a large community and that that is a very nice very language as a see later besides query language and the rest interface quite powerful so it's it's the graph databases in my opinion my personal opinion this is a graph database which best matches the needs we have when we are using a graph PHP OK let's have a look at the
size and query language probably most of you know where the standard query language use the United scale for example and that's quite different as a here on the 1st
slide the main features this human readable In get complex FIL In the 1st line with simple creates statement to create a node and then before I said something that labels and here are perceived as the label of the node uh I don't know must give a label of a node but I can can be more than 1 label so it's just for our organization of at the data which along the store and we know that is concentrate because like finally on the 4th line that we returned an old just created on the
web interface this is actually a screenshot that look like this that created 1 single node and here are the properties this is not special so let's create a
more nodes here same example now we create 3 different nodes all our person labeled nodes and for every you have an identifier and the scene In this example can be the area strain it's there can be no than 1 chart but this is for convenience and we return here in the last line all 3 nodes so this
will look like this with great renounced year with properties so maybe you're asking yourself what is what the
relations because we we want to create nodes but there are 2 relations 1 where you don't have foreign and all that stuff like from with book so this is simple you fraternity handles all
objects as well as the and handles all relations as objects these objects these relations are required most because and every relation object forced which is a pointer unknown annals of target which bonds and all the relations can have properties that's 1 of the the key features of the a graph database because I have to make an example you nodes media birds for 1 and I want to name that sentence when I refer 1 see that this property doesn't belong to doesn't belong to me and does not belong to 1 belongs to the relation that's about the relation properties I will show an example inside for help restoring nation properties but it later so let's see an
example when we have here a matched clause so this is a a selectins Democrat advantage and that we match the 1st person the and a 2nd person and they manual we created for those nodes so we match and you see here the identifiers are called an S and P for source and target but this can be an extremely already said and we find other creates statement and that that's exactly the case how I said it's human readable because this is a kind of ASCII art here show the relation between these 2 nodes so the relation goes from but in fact test which is the source the relation itself has high context and the target is TV or person so it turns the neurons and the relation itself there's a little like this and In this example the relations all channel properties but that means those tools notes FIL we can you ride more complexes in some more stuff there is wrong given the 1st line I I mean mental person and the 2nd line and where where statement that like known from the center of correlated this is only another another flavor which I know how I can notes on how we want do it and that's your choice when we want to show his seconds 2nd example match nodes 1st of all we creating and other nodes I will show a later come with company and this is my employer wants the will that business I for example to give 2 properties the we created and wise and directly after rules we create a relation between me and and return those notes and the relation look like this 1 as you see that new for a web interface that will color the company so you don't see that here for that that the but you see that there is another color because it's a different label on web C it's a company another person that's the remains yeah 1 over to relationship properties I also in and here's the example of the with the since property exactly what I said before I came here make a property inside the relations lessons of timestamp created so the 3rd time will be those 2
objects as before but the relations of the work that relation will have since properties this allows me to to get the more into detail and to work fine granular bed and then analyzes on my data sets so the we created a
graph that was all the magic behind graph databases and you for fertility etc. is it's it's not complex and that's not like it's not this Charlott thing as and you for charity my that might feel like you don't need to you don't need to go traveling to you the job service so and if it creates among the nodes and relations this example looks like this every personal had that works with relation to each other and all have a relation to the company once the so using this this requires a quite simple relation Nolde model I can build huge graphs which much data and to through various things questions so far the this thank you
very much you know of course so the question was if the direction of the and
of the relation of never younger is that it can happen but you can have such obligations on ignoring the direction if you want so if you have a bi-directional relations for example which works in the works that if you use but you can match the direction of the relations of on during this I say and you've achieved unsupported bi-directional relations so I really relation will have 1 direction but you can ignore the fetching of that's what also that we also have the same over all of of the he spent year that was what were what are on the same data set graph in that is often because they think that the began relation to the problem of finding on the software so there are some people this is something that I want to do but there are also that's so the question was that resonances between the both that works that was the the relation uh to each other and the works for relation and this is quite relevant data 1 1 part of the design and in this example it is redolent of course but it can be and the 2nd 1 I want to say that there are ways to to what not have data on the graph and there are some very powerful graph processing algorithms and doing doing such things but that I can't really go into it because that the slot the speaking the systems that small for it but that if you want coming from doesn't talk we can talk about it any other questions so far William of Paris yeah and that this is a this is an issue well not not condition is only because of had yeah that this is an
example of in a novel structure of after the web interface which makes those nice color graphs and you can click on the nodes and this opens this window when comparing other properties and is a border
around there's no this only means I click on animal and probably more right way there is such a property so that's that's only labor but this does not mean that any data are related stuff so
probably the long-awaited topic and using the rest just because we want to use new for change which people will PHP the the
rest against quite powerful as the web interfaces that covers almost all features but and not the question before we talk about the graph processing algorithms that and this is implemented but can overall so yeah infects all features are away will but which you probably shouldn't use that and it works out of the box so if you install for j and you will have the rest again the as you will see that that is based on the Jason it is fast and you have a transactional HDP and pine so you're able to manage transactions over the rest of the so what we want to do
with PHP it this call this from the actually 2 and . using curl the 1st of all a little
example just use mentioned planation people appear to be for example to create a note that weekends and that this Jason statement of the post messages as a post requests the transactional each P and bonds and that we right now our side statement and the property used in this makes it quite simple because of the daytime and the statement itself it's not in the same line and so the snakes view to generate chasing which other Ph.D. the response we get and will show us our data we entered I'm just just a little hands that this was that this was a kind of direct Montserrat so a transactional went the the nodes committed and transactions closed in 1 step it is also possible to open a transaction we create 5 notes with 30 relations and then come with the transaction yeah but we also connects to execute that such agrarian that which is a key feature of this whole chasing so what we have here a matched mary matching all matching in the eye and fetching relation and and so we are fetching all the nodes which are related to the node respondents will look like this we have here in the 1st line here we have the talent showing what we got so as we have you know notes property name and no property age and of course the type of the relation and we get to know what's and year so it's quite simple tool to to create data and so get the bachelor of about them and big overhead so that so
that was at about there's through the query language itself and if you're interested and you want to know more about and can will of more productive which a or or ask me so well
and let's get to their usage in PHP so we will
or we can use of course we can write by hand but there are there are some libraries which make is easy the first one this and your for Cheney PHP by that kind of call wrapper Congress in the face next the quite simple to work tool manage those statements an
example of an implementation you wouldn't hold alter loading by composer or you can do priority whatever you want and we associated clients the ball or and what we don't western saying that such a plan and then will we can hear paths every array of configuration I would know configuration will connect to local host 74 cents for this is very for Chairman's before the on the other end of story on class and
we can call fund name nodes and that will return a no object we that can create property is usually like this and column that safe so the properties the art system can know that and the notes that 2 which of the with than we can for example you get the idea of structured queries which is assigned by the for j the
OK maybe this is a bit too low-level so and what you would know that that doctrinal every so and we can use them then the approach a database of lying here we can use my SQL that's that's this is a library is called the higher Morrison you trade PHP or 300 0 chance for object graph member yeah this is the dark right to style the emperor for j graph databases so it implements a plan elements that you can use annotations to map the entities as well as you probably know it from so sold let's have a look at this 1st
we want to map an entity using those annotations for
example we created and then the object of user then we have to give an idea and tag with the annotation which this there will be and also mapping ID assigned by for change and so we have a 2nd property of full name which we and the fate of the property and we say that so we go to the next so let's have a look
at that those annotations 1st we have the and
innovation from that using this the I have to use this on every class I want to define isn't the object so actually I can't specify reported for at last as I can doctrine through and I can assign the labels for new for J is the same as the work as we did before and that that can so as I already said something about the optimal individually so let's have a look at the property annotation maybe you have some properties in my object which I don't want to have in my my graph which I only use local for example playing passport so I really properties every class number and papers Bojan properties will be sent to the graph optionally I can give a formant the budget and if I the given no form of will be but we have index annotations kind of special can it only works when the property annotation I have to go out and to go back to New for chain itself you know for today has Lucene search index natively so it supports and it supports fast searching and if you if I want to have this property indexed in the search index so if I want to match this this name or search by have taggers an index that last but not least I had those and many-to-one and many-to-many relations which in which only means that in this domain actor in another on the object which is link your can specify relation Maine you're actually all works for me get the example from before and demanding too many relation works exactly like this except that's the variable is an array instead of a single object questions from
limitations let's make an example of that not started yet was so that the group many of you
ladies and 1 of the things that the world of the that is that the I the question was it was and how to add the relation properties and this a year and there is quite simple and the library doesn't support relation property CIA so when the regular working and that gets around the but the problem is fact this that that that that drifts away from the apart from common specification and we have no way we 1 wanting to go with doctrinal or if of wanting go to new which what's there are some people were to then OK so let's the story
and you know at other questions OK that's on on the property
database and 1st of all we have to associate an entity manager like we have to do doctrine this is quite simple we the poetry and this a new class and miniature and provides all the set so we have give but that's in fact we you're wanting to move this over the BSC container or something so I switched the sensation of the being miniature it is well-documented that if you're if you're interested yeah the 2nd line and we have to get the recalling Party objects for our ranking In this case and the user now we can find for except now for example the user content we have no those that magic functions as it is in doctrinal so you can use every functional Signed 1 by and the property and the work there was a question I think no OK so when we fetched for not the 1st not now when we create user chain yeah so with in a new user that set the full names and called the function that follow while fall is that is many-to-one relations and then here we pass the object so if you if we persist in this change in person object Colin miniature flesh and both of those Nolde's entities nodes the well the sentenced to 1 year for and this relation between those 2 will end up 1 with the power follows the yeah on
next step that we want to fetch an interview from the graph for doing this we
can also do like before we get you natural and the repository for the the call find 1 by full name or we and call found by country it would have few countries that the may maybe have seen that we In confined by refined 1 by so the call sign 1 by there will only be 1 object the called signed by it will be an area of objects of all objects matching the and this year we can call sign by directly providing a really will then well the criteria for example would status and the know and we will also have returned the collection of objects
question like the extraction and every other of modernity and persistent API because of that we can use the events for example
we can derive a simple class called preprocessed listen and implement function named preprocess the system and and that we can do Walras stuff here for example call another API way something on the entity itself the that that's that's all we need for our man what we can do we have create and manager and the preprocessed we create before when have injected into the event and after we have a set the event mentions in the end the miniature this looks quite complex but was needed and modelling framework you will do this using the dependency injection that doesn't make sense to this manually
no this is the list of available events follows events accepting state and execute the Proceedings executing post statements execute our from from the from cover so done the whole event and from the whole event management system about from got prime so we'll you can go to the doctor and documentation if you want to know anything about
so let's let's go to the parts the site for queries because this is what the the what the graph database makes a graph database
you can take the set of we we had before and the and manager we can call function creates I'm wearing after that we started know nodes that for example the personal challenge and a given identifier to the laughter we can build a match queries and this can be complex it have to be complex and so we can say OK charming follows and you know and we time similar interests and every other node which follows the followed by no old and we can go further and take those as in their interests from near and far another match to all fellows and color tension match so at the end we will so match which is the result of quite complex I've rarely and return we also have limited and finally we call a gap lists which will be area of objects so that was the that's the and that's what we can do well with the graph what this quite complex with a relational database because yeah regarding production this is a quite simple query can be much more complex but it's remains readable and so on and we're
almost at the end of the summer final parts of the personal but and there are some
drawbacks as we already got from the questions on wheelchair and library I will not recommended for very large datasets because this whole and connecting is kind of overhead so if you have a billion nodes that huge data that's probably want to use the can probably don't want to use a the entity mapping and it also doesn't support streaming so is that you will fire cost to the REST API returning to much they will get the memory exhaustion and it's also not the future complete yet not the as you heard before it does not support their relationship properties in nature and thus support the graph traversals of because and to do this we have to go to trial API and it's probably the PHP and you for taking people are a few so regarding the alpha-chain PHP that's that will be nice to win things will be used to work with these 2 because we have for today is the most common graph databases and PHP is probably the most common scripting language for the Web of this will both is widely used in bold have a big community and also PHP there are other great assistance liver libraries from which we can learn so using new near-vertical PHP together will be created
that's we we have to join forces structural contribute if you want the go to get out new oxygen this is organization which contains the most PHP PU stuff on bundles continue for change of PHP check and well it can't you 4 there are 2 questions left the the so the question was about the commercial non-commercial and you trailers and that's a good question I personally work with the 3 lessons of the of j in a commercial license and you have classes set which allows you to have manufacturing instances and if you need that that big if you need an production you probably want this and you also have paid support when you don't have to be open source license yet that are exactly the effects on I maybe there are more differences but there I must say that I have to consult the and therefore J documentation don't know that all the differences between those lessons Western of the of the of the rest of and the question was if there are no libraries to render the new for chain data and graphs young there's you have what kind tricky and never take a has change itself has a has a quite powerful rendering of the a graphic rendering of the nodes and relationships and saw India the big guys screenshots there are also some cholestrol libraries doing this way I can only but there are some yeah what questions yeah and
I thank you the unit vector from alignment the the slides will be online soon and speak about thank you the
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Metadaten

Formale Metadaten

Titel Playing with Neo4j ­-[:USING]­⇒ PHP
Serientitel FrOSCon 2014
Teil 15
Anzahl der Teile 59
Autor Neff, Frank
Lizenz CC-Namensnennung - keine kommerzielle Nutzung 2.0 Deutschland:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen und nicht-kommerziellen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen.
DOI 10.5446/19640
Herausgeber Free and Open Source software Conference (FrOSCon) e.V.
Erscheinungsjahr 2014
Sprache Englisch

Inhaltliche Metadaten

Fachgebiet Informatik
Abstract Playing with Neo4j ­-[:USING]­⇒ PHP Relations, relations everywhere. They can be difficult and maybe slow to represent in SQL. So why not to use a graph? Neo4j is a highly scalable and robust graph database, which fits your complex relation needs. In this talk, I will give an introduction into the graph concept, Neo4j, the Cypher Query Language and an integration in PHP. There are already some good PHP libraries for graph processing. I'll also show some examples and benchmarks using my favourite lib that is based on the Doctrine Common API. ······························ Speaker: Frank Neff Event: FrOSCon 2014 by the Free and Open Source Software Conference (FrOSCon) e.V.
Schlagwörter Free and Open Source Software Conference
FrOSCon14

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