upgrading database android

Android SQLite database, androidsqlite I. Introduction to SQLite Google provides SQLite,He is outstanding in data storage, management, maintenance, and other aspects,The function is also very powerful. Ii. Features of SQLite 1. lightweightTo use SQLite, you only need to bring a dynamic library to enjoy all its functions,And the size of the dynamic library is smaller.2. IndependenceThe core engine of the SQL

Reference: http://www.helloandroid.com/tutorials/connecting-mysql-database Use PHP as an intermediary to connect android to a remote database. PHP code: Mysql_connect ("host", "username", "password "); Mysql_select_db ("leledata "); $ Q = mysql_query ("select * from people where birthyear> '". $ _ request ['Year']. "'");While ($ e = mysql_fetch_assoc ($ q )) $

This article mainly introduces how to view the data in the SQLite database and the common commands of Sqlite3 in the development of Android.1. Original View SQLite data methodEclipse Menu Window-open Perspective-ddms into Ddms view. Then, in file Explorer view, expand Path/data/data/package_name/databases/, save the DB file pull from device to your computer, and then use Navicat, Sqlitespy or other software

halfway through.Next, configure the Litepal.xmlCreate a new Litepal.xml file in the project's assets directoryConfigured as followsWhere dbname is the name of the database, version is the database and is used for database upgradeList is a mapping function, Com.test.model is the package nameReader is the table nameConfiguring the Androidmanifest.xml FileI underst

1. What is LiteormLiteorm is a small, powerful, 1 time times faster than the system with the database operation performance of the Android ORM Framework class Library, the developer of a line of code to implement the database additions and deletions to the operation, as well as the persistence of entity relationships and automatic mapping. 2. GitHub AddressHttps:

Description: a database transaction is a sequence of database operations that are executed as a whole. Atomicity of transactions: The sequence of database operations contained in the transaction is either executed in full or not executed in full. When all statements are executed, the transaction changes the database to

Use the existing SQLite database in the Android Program In the previous contact project, the pre-stored data in the database needs to be displayed after the application is installed. In this case, you need to import the existing database contact. db. This is also an interview question. How can this problem be achieved?

Android under the first way to delete and change the database1. Create an object for the helper class, call the Getreadabledatabase method, and return a Sqlitedatebase object2. Use Sqlitedatebase object Call Execsql () to do additions and deletions, call rawquery method to do the query. Features: Additions and deletions without a return value, you cannot determine whether the SQL statement was executed successfully. SQL statements written manually, ea

This article mainly records how to determine the existence of tables in the database in Android Sqlitedatabase and the basic operation of testing the Sqlitedatabase database. For a detailed description of SQLite, you can view the reproduced Android data storage--sqlite use detailedExample :androidmanifest.xml--did not

. (rounded).OK, the design of the database is this way, to finish this feeling in fact the design of the database is not difficult, as long as they can analyze the focus of what is done in the good.The app's core data is actually a record, which includes category, time, time, and so on field values.However, it is not possible to design only one table, because designing a table is not conducive to querying a

(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

/* Everyone knows that it will be very tiring to write a blog. Hope = reprint please indicate the source: http://blog.csdn.net/ta893115871 Please do not pity your mouse, (* ^__ ^ *) Xi ...... */ As we all know, databases are very important. Almost all the software on the market needs to use databases. In Android, the database is SQLite, which is small and convenient, occupies less space and is easy to opera

The Android system is moreIosSystem's biggest shortcomings, I believe we all know, is the system security problem. This blog will show a wave“Black Tech". Read user sms Android app can read the SMS on the user's mobile phone, I believe it is not something new, such as we received the SMS verification code, some apps will be able to automatically get and fill in the verification code, save us to manu

1. IndexSimply put, the index is like a book directory, catalogs can quickly find the number of pages, the database index can help to quickly find data, instead of full-table scan, the appropriate index can greatly improve the efficiency of database query.(1). AdvantagesThe speed of database retrieval is greatly accelerated, including single table query, table qu

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

(Dbdir); if (!dirfile.exists ()) dirfile.mkdirs (); Whether the database file was created successfully boolean isfilecreatesuccess = false; Infers whether the file exists, does not exist, creates the file DBFile = new files (dbPath); if (!dbfile.exists ()) {try {isfilecreatesuccess = Dbfile.cre Atenewfile ();//Create File} catch (IOException e) {//TODO auto-generate

When it comes to Android applications, the database is inevitably used. But when we deploy the app's apk to the real machine, the database that has been created and the data inside it cannot be installed on the real machine with the APK.(PS: This blog has overcome a problem with a small game written in my previous blog.) Also able to read the

Recently I am looking at the source code of the Android platform. Next I will summarize the relationship between sqlitedatabase and its underlying sqllite database. How does the upper-layer sqlitedatabase call the underlying SQLite database operation. Sqlitedatabase is a class used by the android framework layer to en

Reprint Please specify source: http://blog.csdn.net/guolin_blog/article/details/40614197In the previous article, we have learned all the usage of the Litepal query operation, and it is clear that Litepal has provided us with a very powerful query API that makes it extremely easy to complete various types of queries. However, in the SQL statement, there is a kind of query is special, is the aggregate function query, it is not the same as the traditional query is the table of some columns of the d

I am in the undergraduate graduation stage, graduation design to do an Android platform, for Java or small white I do have a bit of difficulty, but in the process is still a lot of harvest, now hope to put themselves in the process encountered in the various problems and friends to share, the gods do not like to spray, because the graduation design to do six months, So the next series is almost half a year to write, I try to persist.Let's get started!