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SQLite:"ALTER TABLE `game` ADD UNIQUE(`name`)" Error in SQLite
(1 answer)
Closed 8 years ago.
I have an existing database and I'd like to add the UNIQUE flag to one of the columns to prevent duplicates. What exactly would be the command to put in the onUpgrade section to achieve this?
Regretfully SQLite has very basic support for alter table - you can only either rename the table or add a column - see here.
However you can use similar approach to the one we use for renaming a column.
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Prepopulated database - Android application
(4 answers)
Closed 5 years ago.
I have done a lot of research about the SQLite database, and have already created a SQLite custom helper that extended SQLiteOpenHelper. However, I don't understand where to actually create the database and fill it out. I am trying to have the database be created immediately; I have all the information that needs to be inserted. In other words, no user input is required to fill it out.
Is the best practice to create an individual java class or activity that fills out the database, that can then be accessed by the activities?
Thanks - did a lot of research on creating the database and helper, just having trouble understanding this.
I am trying to have the database be created immediately; I have all the information that needs to be inserted.
Create the SQLite database on your development machine. Package it in assets/ and use SQLiteAssetHelper to ship it with your app. Then, you can query from that data (e.g., to display it to the user).
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Read Only Database Connection with Hibernate
(3 answers)
Closed 6 years ago.
How can I make my database completely read-only for Hibernate? I don't want Hibernate to be able to change neither table definitions (e.g. create/delete/update tables) nor data in tables. Is there some setting in percictence.xml that makes connection read-only?
Hibernate only does what's asked of it - if you set hibernate.hbm2ddl to auto | update | create | create-drop it will try to modify the DB schema. If you run an insert, it will try to insert data. If you want the DB to be protected against it, assign read-only permissions to the DB user that Hibernate is configured to use.
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How to print a JTable object in the Java application
(3 answers)
Closed 6 years ago.
I have a JTable in my application which I need to print. The printed page should contain only the table and some text above and below the table. So I ask what is easiest way to do this?
Do I need to create some kind of document, and then import the table in document and add the text, and then print the document?
well you have to go row by row and print it out
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How to show/hide a column at runtime?
(8 answers)
Closed 5 years ago.
I am using ireport to design jasper reports. I want to have a report that can be dynamically generated based on user input. Means columns can be added/removed based on user input.
The one solution I know is to design the report that contains all the columns, Then based on the user input, Using "Print When Expression" can hide the column, But the empty column will still be there. Is there any way to remove the columns completely without leaving empty space in ireport.
JasperDesign is used to modify the template object (JasperReport) from within the code at runtime. I guess this might fit in your case.
Also check this SO question
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Closed 11 years ago.
Possible Duplicate:
How are Software License Keys generated?
How do software programs verify the product key offline? Is there already a list of possible keys in the db, or does the program decode the input key in some way? If the latter, how is the decoding done?
Well, there are multitudes of algorithms that can be used to encode/decode product keys (using matricies etc.), but one of the more common methods is by use of a program called Keygen. For more information on Keygen, check out this link.