android sqlite database tutorial

. imageView);} private class ButtonOnClickListener implements View. onClickListener {public void onClick (View v) {if (isDownload) {new Thread () {public void run () {mBitmap = getBitmap ("http://s12.sinaimg.cn/mid Dle/4b181bd0gbf6cb07c2a1b 690 "); handler. sendEmptyMessage (DOWNLOAD_FINISH );}}. start () ;}if (isSave) {DBservice service = new DBservice (MainActivity. this); Photo photo = new Photo (1, mBitmap); service. save (photo, photoByte); isLoadFromDB = true; isSave = false; mButton. set

Refer to Android Development Authority Guide1 SQLite tool SQLite database browsersqlite expert extends sionalsqlite extends sqlitespy 2 sqliteopenhelperoncreate (sqlitedatabase dB) // check the database file name. this method is called if the

); } @Override Public voidonCreate (Sqlitedatabase db) {//automatically create tables when using the database for the first timeDb.execsql (Create_table_sql); } @Override Public voidOnupgrade (Sqlitedatabase db,intOldversion,intnewversion) {System.out.println ("--------OnUpdate called--------" + oldversion + "--->" +newversion); }} Public classResultactivityextendsActivity {Listlist; @Override Public voidonCreate (Bundle savedinstancestate) {Super. On

*@paramoldversion old version number *@paramnewversion new version number*/@Override Public voidOnupgrade (Sqlitedatabase db,intOldversion,intnewversion) { }}The creation of an Android database is an object that needs to be created to createCreate a database class object in the Activity classCreate a good data object to manipulate the data. The difference bet

If you want to use the database in Android, using SQLite is a very good choice because it is an Android built-in database that provides a lot of support.The use of the database is nothing more than a crud, that is, "Create,read,up

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 previou

= Helper.getreadabledatabase ();cursor cursor = db.rawquery ("Select *from person", NULL);arraylistwhile (Cursor.movetonext ()){int id = cursor.getint (cursor.getcolumnindex ("id"));String name = cursor.getstring (Cursor.getcolumnindex ("name"));String number = cursor. GetString (Cursor.getcolumnindex ("number"));person person = new person (ID, name, number);List.add (person);}return list;}}ThingsOpen ThingsDb.begintransaction ();Try{Mark Things executed successfullyDb.settransactionsuccessful

getreadabledatabase directly to get the database Sqlitedatabase object. Here is how to voluntarily choose to have an SD card, there is an SD card, not stored in memory.Public Dbopenhelper (Context context) {//define ConstructorsSuper (context, DBNAME, null,version);//Overriding the constructor of a base class}This constructor is changed to the endPublic Dbopenhelper (Context context,string name) {//define ConstructorsSuper (context, name, null,versio

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 intervie

-rav1.0g.imgadb shell flash_image recovery/sdcard/recovery-rav1.0g.img reboot　　　　　　re-mount file system: ADB remountRestart your phone: adb reboot　　　　Manipulating databases with ADB directivesLearn about SQLite data types first　　　　　　　　　　　　　　　　　　Perform ADB shell operations into your Android operating systemExecute the following command: Sqlite3 settings.db　　　　　　　　　　　Get help:.　　　　　　　　　　　Create a tableAdd da

/* 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 conveni

Android programmers must master the sqlite database connection Table query Basic Principles of SQL query: two cases are introduced. 1. Single Table query: filter the records in the table based on the WHERE condition to form an intermediate table (this intermediate table is invisible to users ); then SELECT the corresponding Column Based on the SELECT column to re

More content Welcome to my personal website: www.qingshuimonk.com viewSQLite is a lightweight relational database that currently supports five types of null,integer,real (floating point), text (string literal), BLOB (binary text).The created database file is located in the/data/data/package-name/databases directory.Files can be accessed through the File Explorer in Eclipse.Steps for the

(1);//gets the value of the 2nd column, starting with the index of the first column 0MyPwd = cursor.getstring (2);//gets the value of the 3rd column } if((User.gettext (). toString (). Equals (name)) (Pwd.gettext (). toString (). Equals (MyPwd))) {Toast.maketext ( This, "User authentication succeeded", Toast.length_short). Show (); Intent mainactivity=NewIntent (); Mainactivity. SetClass ( This, Mainactivity.class); This. StartActivity (mainactivity); Finish ();//Exit

OK, now let's take a look at some basic things about using SQLite database in Android.对于大多数app而言对数据库的要求很简单，无非CURD，仅此而已。而我个人比较喜欢将所要使用的相应数据 表封装成javabean再进行操作，这样会显得逻辑比较清晰。First, we write an entity:Package wenyue.justdoit.entity; Public classTododata {PrivateString Todotadkname;Private intId Public int getId() {returnID;} Public void setId(intID) { This. id = ID;}

(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

In recent projects to implement Android reading SQLite database files, here first to do an English-Chinese dictionary example. The main is to input English into the database query the corresponding Chinese meaning, the answer output. The database uses Sqlite3.The implementat

The Android database is written through a transaction at every write, so the consequence is that the speed of writing is super slow, one is near 100ms, then thousands of, no more than two minutes.To speed up, you have to put all the INSERT statements in one transaction, so the speed is greatly increased. Db.begintransaction ();//Start Transaction try { String

1. 2. This demo demonstrates how to use the android SQLite database and bind data to the listview. 3. demonstrate two ways to use databases, including transaction processing. 4. My platform is 2.2. You can run the project after getting it to eclipse, but pay attention to version matching. 5. this demo is suitable for beginners who are learning

When Qt for Android calls the SQLite database,How do I attach an existing database to an APK? Directly in your project in the root directory of the Android source code to create a new folder assets, the d