android SQLite

Android数据存储模式   File、Network、SharedPreferences、SQLite
SharedPreferences：会以xml文件形式存储数据

   // interface SharedPreferences
	       this.getSharedPreferences(Sring fileName,int mode);//创建或获得以fileName命名的SharedPreferences
	       editor();//获得SharedPerference的编辑器
	       Type getType();//读取数据

   //interface SharedPreferences.Editor
	         putType(String key;Type value);//压入数据
		 remove(String key);//移除数据
		 clear();//清空数据
		 commit();//提交操作结果
		 apply();//提交操作结果

  SharedPreferences操作示例

    public class MyActivity extends Activity
	{	    
	    public void onCreate(Bundle saveInstanceState)
		{
		    super.onCfeate(saveInstanceState);
			setContentView(R.layout.myLayout);
			Button button=(Button)findViewById(R.id.button);
			button.setOnClickListener(new OnClickListener(){
			    public void click()
				{
				    SharedPreferences sp=this.getSharedPreferences("setting",Activity.MODE_PRIVATE);
					SharedPreference.Editor editor=sp.editor();
					editor.putString("userName","Jay");//压入数据
					editor.remove("userName");//移除数据
					editor.commit();//提交操作
					/*
					    sp.getString();//获取数据
					*/
				}
			});
			
		}
	}

SQLite:  

             SQLiteOpenHelper:抽象类，具有数据库的创建、开启和数据库版本管理的功能。继承该类的subClass需要继承父类的构造方法，

                                                 并implement abstract    onCreate(SQLiteDatabase db) 和 abstract onUpgrade() method.

//abstract SQLiteOpenHelper	          
        SQLiteOpenHelper( Contextcontext,Stringname,
                                        SQLiteDatabase.CursorFactory factory,
                                         int   version);
	 abstract onCreate(SQLiteDatabase db);//当数据库第一次加载时执行此方法
	 abstract onUpgrade( SQLiteDatabase db,int oldVersion,int  
                                           newVersion);//数据库版本管理
	  void Open(SQLiteDatabase db);//当数据库被打开后调用此方法
	  SQLiteDatabase getReadableDatabase();//获取只读数据库
	   SQLiteDatabase getWritableDatabase();//获取可写数据库
	   String getDatabaseName();//获取数据库名称	
	
//SQLiteDatabase
	       void execSql(String statement);
		long insert(  String tableName,String nullColumn ,
                                     ContentValues values);//Hash结构//ContentValues
		int delete(  String tableName,String whereClause,
                                  String [] whereArgs);
		int update( String tableName,ContentValues values,
                                  String whereClause,String[] whereArgs);
		Cursor query( String tableName,String columns,
                                       String whereClause,String[] whereArgs,
                                        String groupBy,String having,
                                        String orderBy,String limit());

//ContentValues
	      new ContentValues();
	      void put(String key,Type value);//压入数据

 //interface Cursor、SQLiteCursor游标
	    //关于位置的method
		    boolean isFirst();               boolean isLast();
		    boolean moveToNext();     boolean moveToPrevious();   
                    boolean moveToPosition();
          //获取数据
                    int getCount();
		     Bundle getExtras();
		     int getColumnIndex(String columnName);
		     Type getType(String columnIndex);   
//SQLiteQuery
//SQLiteQueryBuilder
//SQLiteStatement 

 SQLite示例：

    //创建SQLiteOpenHelper子类SubSQLiteOpenHelper
    SubSQLiteOpenHelper extends SQLiteOpenHelper
	{
	    private final int VERSION=1;
		//构造函数1
	    public SubSQLiteOpenHelper(Content content,String dbName,SQLiteDatabase.CursorFactory factory,
		                           int version)
		  {super( content, dbName, factory,version);}
		  
		//构造函数2，调用构造函数1
		public SubSQLiteOpenHelper(Content content,String dbName,int version)
		{SubSQLiteOpenHelper(content, dbName,null, version);}
		
		//构造函数3，调用构造函数2
		public SubSQLiteOpenHelper(Content content,String dbName)
		{SubSQLiteOpenHelper(content, dbName,null, VERSION);}

		//实现OnCteate函数
		public void OnCreate(SQLiteDatabase db)
		{
		   //your code here；
		   db.execSql("
		               create table tbUser(
					       userId int not null primary key auto_increment,
						   userName varchar(20) default null,
						   userPhone varchar(11) not null
		               )default charset=utf8;
		   ");
		}

		public void OnUpgrade(SQLiteDatabase db,String oldVersion,String newVersion)
		{
		    //your code here;
		}
	}
	
	//创建activity，DatabaseActivity
	public class DatabaseActivity extends Activity
	{
	    SubSQLiteOpenHelper dbHelper=new SubSQLiteDatabaseHelper(DatabaseActivity.this,"appDB");
		SQLiteDatabase db=null;
		
		Button buttInsert=(Button)findViewById(R.id.buttInsert);
		Button buttDelete=(Button)findViewById(R.id.buttDelete);
		Button buttUpdate=(Button)findViewById(R.id.buttUpdate);
		Button buttQuery=(Button)findViewById(R.id.buttQuery);
		
		public void OnCreate(Bundle saveInstanceState)
		{
		    super.Oncreate(saveInstanceState);
			
			//Insert
		    buttInsert.setOnClickListener(new OnClickListener(){
			    public void click()
				{
				    ContentValues values=new ContentValues();
				    db=dbHelper.getWritableDatabase();
					//db.execSql("sqlStatement");
					
					values.put("userName","Jay");
					values.put("userPhone","00000000001");
					db.Insert("tbUser",null,values);
					values.put("userName","Jasion");
					values.put("userPhone","00000000002");
					db.Insert("tbUser",null,values);
				}
			});
			
			//delete
			buttDelete.setOnClickListener(new OnClickListener(){
			    public void click()
				{
				    db=dbHelper.getWritableDatabase();
					//db.execSql("sqlStatement");
					db.delete("tbUser","id=?",new String[]{"2"});
				}
			    
			});
			
			//update
			buttUpdate.setOnClickListener(new OnClickListener(){
			    public void click()
				{
				    ContentValues values=new ContentValues();
					values.put("userName","Jay2");
				    db=dbHelper.getWritableDatabase();
					//db.execSql("sqlStatement");				
					db.update("tbUser",values,"userName=?",new String[]{"Jay"});
				}
			    
			});

			//query
			buttQuery.setOnClickListener(new OnClickListener(){
			    public void click()
				{
				    SQLiteCursor cursor=null;
					db=dbHelper.getReadableDatabase();
					cursor=db.query();
				}
			    
			});
			
		}				
	}