Android关系型数据库应用——电话（短信）黑名单

1.打开数据库，创建数据表；

2.对数据进行crud（Create Read Update Delete）；

1.打开数据库，创建数据表；

           1.SQLiteOpenHelper

           2.SQLiteDatabase

                          .execSQL("create table blacknumber (_id integer primary key autoincrement, number varchar(20))");

2.对数据进行crud（Create Read Update Delete）；

           1.增：db.execSQL("insert into blacknumber (number) values(?)", new Object[]{number});

           2.删：db.execSQL("delete from blacknumber where number = ?", new Object[]{number});

           3.改：db.execSQL("update blacknumber set number = ? where number = ?", new Object[]{newnumber,oldnumber})

           4.查：Cursor cursor = db.rawQuery("select * from blacknumber where number =?", new String[]{number});

           5.查所有：Cursor cursor = db.rawQuery("select number from blacknumber", null);

1.打开数据库，创建数据表；

import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;public class BlackNumberDBOpenHelper extends SQLiteOpenHelper {public BlackNumberDBOpenHelper(Context context) {super(context, "blacknumber.db", null, 1);}/** * 数据库第一次被创建的时候 调用oncreate() * 初始化数据库表结构的操作 */@Overridepublic void onCreate(SQLiteDatabase db) {db.execSQL("create table blacknumber (_id integer primary key autoincrement, number varchar(20))");}/** * 数据库已经操作 并且 新的数据库的版本 大于 旧的数据库的版本 * 数据库的表结构信息的更新 */@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}}

2.对数据进行crud（Create Read Update Delete）；

public class BlackNumberDao {BlackNumberDBOpenHelper helper ;public BlackNumberDao(Context context) {helper = new BlackNumberDBOpenHelper(context);}/** * 添加一条黑名单号码 */public void add(String number){if(find(number)){return ;}SQLiteDatabase db  = helper.getWritableDatabase();if(db.isOpen()){db.execSQL("insert into blacknumber (number) values(?)", new Object[]{number});db.close();}}/** * 删除一条黑名单的数据 */public void delete(String number){SQLiteDatabase db  = helper.getWritableDatabase();if(db.isOpen()){db.execSQL("delete from blacknumber where number = ?", new Object[]{number});db.close();}}/** * 更改一条黑名单的号码 */public void update(String oldnumber,String newnumber){SQLiteDatabase db  = helper.getWritableDatabase();if(db.isOpen()){db.execSQL("update blacknumber set number = ? where number = ?", new Object[]{newnumber,oldnumber});db.close();}}/** * 查询一条黑名单号码 */public boolean find(String number){boolean result =false;SQLiteDatabase db  = helper.getReadableDatabase();if(db.isOpen()){Cursor cursor = db.rawQuery("select * from blacknumber where number =?", new String[]{number});if(cursor.moveToFirst()){result = true;}cursor.close();db.close();}return result;}/** * 查找全部黑名单号码 */public List<String> findAll(){List<String> numbers = new ArrayList<String>();SQLiteDatabase db  = helper.getReadableDatabase();if(db.isOpen()){Cursor cursor = db.rawQuery("select number from blacknumber", null);while (cursor.moveToNext()) {numbers.add( cursor.getString(0));}cursor.close();db.close();}return numbers;}}