sqlite tool for android

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.

The example in this article describes how the Android operation SQLite the database under the Assets folder. Share to everyone for your reference. Specifically as follows: Because this project needs to bring data, so put the data into a SQLite database file, then put the file under the Assets folder. The first plan is to copy the folder from the assets folder to

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

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

Android SQLite database BASICS (1 continued), androidsqlite Supplementary note, in the previous article, I have joined the following content, have not read the first article, you can directly read the first article can be (http://www.cnblogs.com/flylin/p/qq_980542577.html ). Read this article. Create a test class to test whether the Code mentioned in the previous article is correct: Add the following code

Creating a Database Android does not automatically provide a database. Using SQLite in an Android application, you must create your own database, and then create tables, indexes, and fill data. Android provides sqliteopenhelper to help you create a database, and you can easily create a database just by inheriting the

Yusong Momo introduces you to the database SQLite Of The World Of Game Development If the original Yusong Momo article is reprinted, please note: It is reprinted to my independent domain name blogYusong Momo program Research Institute, Original address: http://www.xuanyusong.com/archives/287 Database SQLite IntroductionThe four most classic operations of the database are addition, deletion, modification,

SQLite Operation class: Packagecom.example.administrator.myapplication;ImportAndroid.content.Context;Importandroid.database.sqlite.SQLiteDatabase;ImportAndroid.database.sqlite.SQLiteOpenHelper; Public classBookmarksqliteopenhelperextendssqliteopenhelper{ PublicBookmarksqliteopenhelper (context context, String name, Sqlitedatabase.cursorfactory factory,intversion) { Super(context,name,factory,version); } @Override Public voidonCreate (Sqlitedata

Android --- Toast tool class, a little lazy, Android --- toast tool class Package com. liunan. myfirstapp. util; import android. content. context; import android. widget. toast;/*** Toast

The SQLite date type is represented in a format different from the text, real, and integer types, corresponding to the following:TEXT: "Yyyy-mm-dd HH:MM:SS. SSS "REAL: stored in Julian date formatINTEGER: Saves the data value in Unix time, which is the number of seconds from 1970-01-01 00:00:00 through the current time.Select from where attend_time between datetime ('2012-08-1600:00:00') and datetime (' 2012-08-17 00:00:00'); select * from on_work

that is rounded to the specified length or precision.Character processing functionsLength (X) returns the number of characters for the given string expression.Lower (X) returns a character expression after converting the uppercase character data to lowercase characters.Upper (X) returns the character expression that converts the lowercase character data to uppercase.substr (x, y, z) returns part of an expression.Randstr ()QUOTE (A)A like (A, B) determines whether the given string matches the sp