android sqlite tutorial

The SQLite database is a built-in database of Android, small and powerful enough to work with most SQL statements, while SQLite databases are just files. Although SQLite is a bit much, but not as powerful as the PC-side MySQL, and the Android system is not allowed to operate

The database used in Android is an open source database SQLite database, the following is the main detailed introduction of the use of SQLite:An Introduction to SQLitewhen we write database applications, we need to consider the problem: because the software we develop may be installed on many users ' phones, if the application uses SQLite database, we must create

Originally did not want to write this blog, but see the internet on the Android database operation of the blog is very detailed, for beginners like me to understand the basic operation of SQLite is a certain difficulty, so I refer to some blog posts on the Internet, and I personally groped over, Hope to write a blog record of the most basic operation of SQLite, b

Android sqlite database Okay. Now let's take a look at some basic operations on using the sqlite database in android. For most apps, the database requirements are simple, nothing more than CURD. I personally prefer to encapsulate the corresponding data tables to be used into a javabean for further operations, which mak

Read a lot of other people wrote the Android SQLite data operation code, are floating clouds, blind! It is not easy to understand, I think I write well, and the Android project is also used, so in the blog park to save and share a bit!A Sqlitehelper class is an automatic overload of adding and deleting functions, and the other is a class of its own definition, us

This week to develop the function of data synchronization, but the first thing to solve is the issue of SQLite database upgrade, about the database upgrade has a lot of aspects involved, perhaps you are new added functionality, so new table, perhaps you have added some fields for some tables, perhaps you are refactoring the data model and structure, regardless of how to upgrade, The original data must not be lost if the user's normal upgrade is to be

(index); Is the data that gets the specified subscript index to int type; int id = cursor.getint (cursor.getcolumnindex ("id")) ; String named = cursor.getstring (Cursor.getcolumnindex ("name")); String number = cursor.getstring (Cursor.getcolumnindex ("number"));//Instantiate query result data Object person = new person (ID, named, number);} Close the database connection, release the Resource Db.close ();//Return the data result object return person; /** * Update a data based on name * * @para

Sharedpreferences is only suitable for storing relatively simple data and key-value pairs, supporting different data typesFile storage key value pairs are not, no format processing, storing simple binary or text dataSQLite can handle data that is large in size and complex in structure.Manage SQLite Sqlitehelper: Abstract class, you need to create your own helper class to inherit it, and rewrite OnCreate and Onupgrade,There are also two instance method

There was no such table on the search page for the project today.The first reaction is to find the error place, debug, check whether the statement is correct, but has not found the problem, finally clean project, uninstall the program,Reinstall after the OK, I from an English website to find a solution to this problem a few ways Uninstalling app Cleaning Cache/data Changing database version number Forcing to copy the database even if it already existed Links: http://peter.grman.

1 in the Android Studio project, right-click the new Assets folder in the Gradle folder. Import the built SQLite database into it.2 in the main activity to determine whether the app is the first time to start the call the following method:/** Check if the app is first launched */private int checkfirstactivate () { /* Set Database transfer status */ int setsqlitedatabase_state = 0; /* Check to see i