android sqlite tutorial

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 database. From the perspective of

SQLite Introduction SQLite is a very popular embedded database. It supports the SQL language and has good performance only with a small amount of memory. In addition, it is open-source and can be used by anyone. Many open-source projects (Mozilla, PHP, Python) Use SQLite. SQLite consists of the following components

= context.getsharedpreferences (file_name, context.mode_private); Sharedpreferences.editor Editor = Sp.edit (); Editor.remove (key); Editor.commit (); }/*** Returns all key-value pairs */public static mapfile_name, context.mode_private); map/*** Delete all data */public static void Clear (context context) {Sharedpreferences sp = context.getsharedpreferences (file_name, context.mode_private); Sharedpreferences.editor Editor = Sp.edit (); Editor.clear

I took notes after reading instructor Xiao Bu's "SQLite Quick Start video tutorial ". Lecture 1 What is SQLite?Why?How to get it? How to install?How to manage it?How to Use Perl to access SQLite data;How to use C or C ++;SQL features not supported by SQLite; Self-contained

Android SQLite Store Custom objectsThe data types that can be stored in the SQLite database are null, INTEGER, REAL (floating point), TEXT, BOOL, all five data types. In Android development, the general practice in which we store data is that the properties of the database are the member variables of the class, such as

You can use the Eclipse plugin Ddms to view it in Android, or you can use the ADB tool in the Android Toolkit. The SQLite database in the Android project is located in the/data/data/ project package /databases.Use DDMS to export the SQLite database.1, first open the

SQLite is a lightweight relational database built into Android that is fast and resource-intensive, and typically requires only hundreds of K of memory, making it ideal for use on mobile devices.SQLite not only supports standard SQL syntax, but also adheres to the acid transactions of the database, so if you have other database bases, you'll get started quickly. Unlike other databases,

SQLite, is a lightweight database, is widely used in a lot of embedded products, because the use of very little resources, two of the operation of the way almost and we contact the database is not much, even only hundreds of k he will naturally be favored by the demand, Let's talk about how to read and write to him in such a lightweight database.Before making a selection of contacts appear if a phone more than 2000 contacts, inserting into the databas

Android SQLite database use example, androidsqlite For a brief introduction, mainstream mobile devices such as Android and iPhone all use SQLite as the storage engine for complex data. When we develop applications for mobile devices, we may need to use SQLite to store a larg

I,SQLite Introduction On the Android platform, an embedded relational database-SQLite is integrated. sqlite3 supports null, integer, real (floating point number), text (string text), and blob (binary object) data types, although it supports only five types, sqlite3 actually accepts data types such as varchar (N), char (N), decimal (P, S, it is only converted

As an Android preset database module, it is necessary to have a deep understanding of SQLite and find some optimization directions. Here, we have tested and analyzed the performance and memory of SQLite, compared the execution performance and memory usage of different operations, and roughly listed it here as a summary. 1. Basic Architecture First, let's take a

Last time I introduced you to the basic information and usage process of SQLite. I believe my friends have some knowledge about SQLite. Today, I will share with you how to use SQLite in Android. Currently, mainstream mobile devices such as Android and iPhone all use

You can use the Eclipse plugin Ddms to view it in Android, or you can use the ADB tool in the Android Toolkit. The SQLite database in the Android project is located in the/data/data/ project package /databases.Use DDMS to export the SQLite database.1, first open the

Original address: http://www.cnblogs.com/wangmars/p/3914090.htmlSQLite, is a lightweight database, is widely used in a lot of embedded products, because the use of very little resources, two of the operation of the way almost and we contact the database is not much, even only hundreds of k he will naturally be favored by the demand, Let's talk about how to read and write to him in such a lightweight database.Before making a selection of contacts appear if a phone more than 2000 contacts, inserti

When an application is installed in Android, we generate a lot of data in the process of using the app, and the app has its own data, so how do we store the data?How data is storedThere are 5 ways to store your Android data: 1. Sharedpreferences Storage Data sharedpreferences data storage, also known as XML storage.This is the data stored under the "data/data/Package name/share_prefs" path to the XML file.

://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical"Tools:context=". Mainactivity " > EditTextAndroid:id= "@+id/name"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:hint= "Enter Name" /> EditTextAndroid:id= "@+id/age"Android:layout_width= "Match_parent"Android:layout_height= "W

As a database module for Android presets, an in-depth understanding of sqlite is necessary to find some direction of optimization. The performance and memory of SQLite are tested and analyzed, and the performance and memory consumption of different operations are compared, which is a summary in this case.1. Basic ArchitectureFirst look at the main architecture of

I recently started learning Android programming and wrote a small project myself. One requirement is to initialize an SQLite database from a file. That is, I have a file containing a lot of SQL statements. I want my android program to execute this SQL statement and initialize the database when it is started for the first time. However, this SQL statement will not

();//contentvalues CV = new Contentvalues ();//Cv.put ("name", "Shangsan");//Cv.put ("Sex", "male");////dbwriter.insert (table, nullcolumnhack, values);// Sqlitedatabase dbraed = Db.getreadabledatabase ();//cursor c = dbraed.query (table, columns, selection, Selectionargs, GroupBy, having, by-and-by);Cursor C = Dbraed.query ("User",NULL,"Name=?",Newstring[]{"Zhangsan"},NULL,NULL,NULL); while(C.movetonext ()) {String name = c.getstring (C.getcolumnindex ("Name")); String sex = c.getstring (

ObjectiveSQLite is a lightweight small database, although relatively small, but relatively perfect function, some common database basic functions also have, in the current embedded system using the database is much more, because it occupies little system resources. Android system is no exception, is also using SQLite, in this section to learn how to use the database in Andorid to store data, and for