SQLite database for four ways to store Android data

Test.java:

/** * This example solves the problem: * Core issue: Create a Database object through the Sqliteopenhelper class * operation of database objects through database object * 1.SQL statement Operation SQLite Database * 2. Google provides API to SQLite database operation * 3. SQLite operations on Transactions */import Com.ghsy.createsqlitedb.db.myopenhelper;import Android.content.contentvalues;import Android.database.cursor;import Android.database.sqlite.sqlitedatabase;import Android.test.AndroidTestCase;public Class Test extends Androidtestcase {myopenhelper oh; Sqlitedatabase db;public void Test () {//Create a Myopenhelper object//Modify the version number here, the upgrade method is executed--upgrade method adds a column Myopenhelper Oh = New Myopenhelper (GetContext (), "people.db", NULL, 3);//If the database does not exist, first create the database, then open the database, if it already exists, directly open sqlitedatabase db = Oh.getwritabledatabase ();d b.close ();} Test framework Initialization Complete/** * This method was called before a test is executed */@Overrideprotected void SetUp () throws Exception {//T ODO auto-generated Method Stubsuper.setup (); oh = new Myopenhelper (GetContext (), "people.db", NULL, 3);d B = oh.getwritable Database ();} ===========sql Statement mode operation SQLite database ================================public void Insert () {DB.execsql ("INSERT into person (name, phone, money) VALUES (?,?,?)", new object[] {"Daming", "18666", 6000});d B.execsql ("Inser T into person (name, phone, money) VALUES (?,?,?) ", new object[] {" Small red "," 18666 ", 6000});d B.execsql (" INSERT into person (NA Me, phone, money) VALUES (?,?,?) ", new object[] {" Scarlet "," 18666 ", 6000});} public void Delete () {db.execsql ("delete from person where name =?", new object[] {"Daming"}); public void Update () {db.execsql ("update person Set money = 10000 WHERE name =?", new object[] {"Xiaoming"}); public void query () {///cursor, which holds the data returned by the query, gets the same method as the resultset height cursor c = db.rawquery ("SELECT * from person", new string[] {}); whi Le (C.movetonext ()) {String name = c.getstring (C.getcolumnindex ("name")); String phone = c.getstring (C.getcolumnindex ("Phone")); SYSTEM.OUT.PRINTLN (name + ";" + Phone);}} ============== Google provides API to SQLite database operation ======================/** * Api-insert data to table */public void Insertapi () { Contentvalues CV = new Contentvalues () cv.put ("Name", "Twilight"); Cv.put ("Phone"), 15666); Cv.put ("Money", 630); Long id = db.insert ("person", NULL, CV); SYSTEM.OUT.PRINTLN (ID);} /** * api-delete data from Table * * @return The number of rows affected */public int Deleteapi () {int affectednum = DB.D Elete ("Person", "name=", new string[] {"Little Red"}); return affectednum;} /** * api-update */public void Updateapi () {contentvalues contentvalues = new Contentvalues (); Contentvalues.put ("Name", " Contentvalues.put ("Money", "ten");//return the number of rows affecteddb.update ("person", contentvalues, "Name=?", New string[] {"Scarlet"});} public void Queryapi () {CURSOR cursor = db.query (' person ', new string[] {"Phone", "money"},null, NULL, NULL, NULL, NULL) ; while (Cursor.movetonext ()) {String phone = cursor.getstring (Cursor.getcolumnindex ("Phone")); String money = cursor.getstring (Cursor.getcolumnindex ("money")); SYSTEM.OUT.PRINTLN (Phone + "# #" + Money);}}   ===============sqlite operation of the transaction =====================/** * Bank transfer operation */public Void Transation () {db.begintransaction (); try {//name for Twilight users to the small red transfer contentvalues contentvalues=new contentvalues ();   Contentvalues.put ("Money", 1000);   Db.update ("Person", contentvalues, "Name=", New string[]{"Twilight"});   Contentvalues contentvalues2=new contentvalues ();   Contentvalues2.put ("Money", 1100);   Db.update ("Person", ContentValues2, "Name=", New string[]{"Little Red"});   All statements are executed, and if there is no exception, the token db.settransactionsuccessful () that sets the transaction success is executed. Finally {//checks the identity of the transaction and, if the Settransactionsuccessful () method setting flag is not called, rolls back the transaction.       Otherwise commits the transaction.   Db.endtransaction (); }}}

Myopenhelper.java

**sqliteopenhelper: * A helper class to manage database creation and version management. * Therefore, Sqliteopenhelper is the operation of the library itself. To manipulate data in a library, you need to use the method of the library object. */import Android.content.context;import Android.database.sqlite.sqlitedatabase;import Android.database.sqlite.sqlitedatabase.cursorfactory;import Android.database.sqlite.sqliteopenhelper;public Class Myopenhelper extends Sqliteopenhelper {//name: Database file name//factory: Cursor Factory//version: version, must be greater than or equal to 1public myopenhelper ( Context context, String name, Cursorfactory factory, int version) {Super (context, name, Factory, version);//TODO Auto-gen Erated Constructor stub}//Database is created when you call @overridepublic void OnCreate (Sqlitedatabase db) {//Create a person table Db.execsql ("Create Table person (_id Integer primary key autoincrement, name Char (TEN), Phone char (20)) "); System.out.println ("OnCreate called");} Database upgrade calls @overridepublic void Onupgrade (sqlitedatabase db, int oldversion, int newversion) {//TODO auto-generated Metho D stubSystem.out.println ("Onupgrade called");d B.execsql ("ALTER TABLE person Add Money char (20) ");}}