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I have a table in my database. I am using jdbc to use this database. I want to update a particular data by subtracting it to some value.
Suppose a student with name xyz is there. Currently his marks in a subject is 50. I want to delete it by 10, then what would be the syntax? I am new to SQL.
More or less:
update students
set mark = mark - 10
where name = 'xyz'
Can't give a better answer than that, as your question is very limited in useful and concrete information. I'm sure you'll figure it out.
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I want to parse a pdf which is having a table. But, couldn't find any library(in java) which could read a pdf in a format in which it appears.
Basically, the existing libraries read a table just as a string without preserving the format. So, what is the best way to parse it and get the list of key value pairs in java?
Pdf screenshot sample
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In a recent interview with Amazon I have been rejected because I could not tell the advantage and disadvantage of making model and Entity classes different and same.
I have always created Model and Entity class same.
Can anybody help me on that with an example? Interviewer said you are making strong binding of UI+DB if you are keeping it same.
It's true by making same class for Entity and Model you are tightly binding UI and DB, simple example of why should avoid is -> most of the time, we modify response like adding DTO, modifying format of date and so on. which could impact your database calls (DTO layer).you can read more here
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Is there a way in Java to create a List implementation that has a timeout/eviction policy for items contained in the list? Something along the lines of:
List<SomeObject> myList = new TimeoutList<>(10, TimeUnit.SECONDS);
so that items entered into the list will be automatically evicted after the given time. I know about the Guava Cache, but a cache is a Map and will not maintain the order of the items entered.
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Where I can find a reference to which all data types come under certain media types?
For example, #Consumes(MediaType.APPLICATION_FORM_URLENCODED) can consume a String or MultivaluedMap in Java.
I would like to such reference. Any help is appreciated.
I found the answer for my own question. I am just putting it out here so that in future if anyone needs to refer can refer to it :
On the following oracle webpage refer to the table mentioned in section 'Using Entity Providers to Map HTTP Response and Request Entity Bodies'
https://docs.oracle.com/cd/E19798-01/821-1841/6nmq2cp22/index.html
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I want to compare the 2 images(images of people)and want a result that these are of same person or not(By Face recognization).I have to do this for millions of images so I cannot do it manually .Is there any api for android that can be used in my app.
You could use Camera.Face or FaceDetector.Face class. Take parameters of face on both photos and compare their parameters using e.g. eyesDistance(). If those parameters quite the same -> its the same person.