upgrading database android

Background: SQLite is a very popular embedded database. It provides a refreshing SQL interface, a relatively small memory usage and high-speed response. Even more Happy, it is still free of charge, you can use it as much as you like. Many companies (such as Adobe, Apple, Google, Sun, and Symbian) and open-source projects (Mozilla, PHP, and Python) all assemble SQLite in the product. In Android, SQLite is in

There are two ways to access images in an Android database, one is to save the path to the image, and the other is to store the image in binary form (Sqlite3 supports BLOB data types). For the use of the two methods, as if the second method than the first method is more popular with programmers, they think, in many database languages, the processing of large segm

= new file (Dbdir); Dirfile.exists ()) dirfile.mkdirs ();//The database file is created successfully boolean isfilecreatesuccess = false;//Determines if the file exists and does not exist the file is created DBFile = new File (DbPath), if (!dbfile.exists ()) {try {isfilecreatesuccess = Dbfile.createnewfile ();//Create File} catch (IOException E ) {//TODO auto-generated CATch blocke.printstacktrace ();}} Elseisfilecreatesuccess = true;//Returns the

table * * public void AddData () { Contentvalues CV = new Contentvalues (); Cv.put (Table_num, Micount); Cv.put (table_data, "test database Data" + Micount); /* Insert Data * * Msqlitedatabase.insert (table_name, NULL, CV); micount++; Updataadapter (); } /* Delete the specified data from the table. public void DeleteData () { /* Delete Data * * Msqlitedatabase.execsql ("DELETE from" + table_name + "WHERE _id=" + integer.tostring (micount));

Android GreenDao database framework Learning (1), androidgreendao 1. GreenDao Overview: GreenDAO Is An ORM solution that helps Android Developers quickly map Java objects to SQLite database forms. GreenDAO features the highest operating efficiency and the lowest memory consumption. Official Website: http://greendao-orm

Note Here the most basic usage, the official website can understand the relevant introduction.1. Download Ormlite jarOn the download Android: Ormlite-android-4.48.jar and Ormlite-core-4.48.jar, put in your project's libs directory.2. Write The Bean class PackageCom.example.ormlite.bean;Importjava.util.Collection;ImportCom.j256.ormlite.field.DatabaseField;ImportCom.j256.ormlite.field.ForeignCollectionField;I

To manipulate the SQLite database on the Android real computer directly from the command line, you can do it directly through the ADB shell, but only if you have to get root privileges.In addition, the Android system is actually the Linux shell, this should be known, but under normal circumstances, in the/system/xbin/directory,There is no sqlite3 command, you nee

This article is original, if you need to repost, please indicate the author and source. Thank you! it's time to explain the database. Databases are also the core of the android storage solution. The SQLite database is used in the Android system. SQLite is a very lightweight data