SQLite应用

SQLiteOpenHelper类

public class PersonSQLiteOpenHelper extends SQLiteOpenHelper {	public final static String LOGTAG       = "PersonSQLiteOpenHelper";	public final static String DB_NAME      = "person.db";	public final static String TABLE_NAME   = "contract";	public final static int VERSION         = 1;	public final static String COL_NAME     = "name";	public final static String COL_ADDR     = "addr";	public final static String TABLE_CREATE = "create table if not exists " + TABLE_NAME + "("			+ "id integer PRimary key autoincrement not null,"			+ COL_NAME + " text not null, "			+ COL_ADDR + " text not null"			+ ")";	public PersonSQLiteOpenHelper(Context context) {		this(context, DB_NAME, null, VERSION);	}	public PersonSQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {		super(context, name, factory, version);	}	@Override	public void onCreate(SQLiteDatabase db) {		db.execSQL(TABLE_CREATE);	}	@Override	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {		Log.i(LOGTAG, "onUpgrade");	}}
SQLiteDatabase类
1、打开数据库调用SQLiteOpenHelper的getWritableDatabase或getReadableDatabse方法。也可以使用SQLiteDatabase的openDatabase或者openOrCreateDatabse方法。2、数据库操作查询，query或rawQuery。增加，insert。删除，delete。修改，update。
public List<Person> query() {	List<Person> list = new ArrayList<Person>();	Cursor cursor = getReadableDatabase().query(TABLE_NAME,		new String[]{COL_NAME, COL_ADDR}, null, null, null, null, null);	while (cursor.moveToNext()) {		Person person = new Person();		person.name = cursor.getString(cursor.getColumnIndex(COL_NAME));		person.addr = cursor.getString(cursor.getColumnIndex(COL_ADDR));		list.add(person);	}	cursor.close();	return list;}public void add(String name, String addr) {	ContentValues values = new ContentValues();	values.put(COL_NAME, name);	values.put(COL_ADDR, addr);	getWritableDatabase().insert(TABLE_NAME, null, values);}public void delete(String name) {	getWritableDatabase().delete(TABLE_NAME, COL_NAME + "=?", new String[]{name});}public void modify(String name, String addr) {	ContentValues values = new ContentValues();	values.put(COL_NAME, name);	values.put(COL_ADDR, addr);	getWritableDatabase().update(TABLE_NAME, values, COL_NAME + "=?", new String[]{name});}