[置顶] Android SQLiteDatabase 数据库操作（建立数据表，增删改查操作）

public class BlackNumberDBHelper extends SQLiteOpenHelper {

private static SQLiteOpenHelper mInstance;

private final static String name = "xxx.db";

public static SQLiteOpenHelper getInstance(Context context){
if(mInstance == null){
mInstance = new BlackNumberDBHelper(context, name, null, 1);
}
return mInstance;
}

private BlackNumberDBHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
// TODO Auto-generated constructor stub
}

@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("create table xxx(_id integer primary key autoincrement,xx_1 text)");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub

}

}

public class Dao {

private SQLiteOpenHelper mOpenHelper;

public BlackNumberDao(Context context) {
// TODO Auto-generated constructor stub
mOpenHelper = BlackNumberDBHelper.getInstance(context);
}

//添加数据信息
public void add(String xx_1){
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
if(db.isOpen()){
ContentValues values = new ContentValues();
values.put("xx_1", xx_1);
db.insert("xxx", "_id", values);
db.close();
}
}

//判断号码是否是数据信息
public boolean isBlackNumber(String xx_1){
boolean isExist = false;
SQLiteDatabase db = mOpenHelper.getReadableDatabase();
if(db.isOpen()){
Cursor c = db.query("xxx", null, " xx_1= ? ", new String[]{xx_1}, null, null, null);
if(c.moveToFirst()){
isExist = true;
}
c.close();
db.close();
}
return isExist;
}

//删除数据信息
public void delete(String xx_1){
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
if(db.isOpen()){
db.delete("xxx", " xx_1= ? ", new String[]{xx_1});
db.close();
}
}

//更新数据信息
public void update(int id,String xx_1){
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
if(db.isOpen()){
ContentValues values = new ContentValues();
values.put("xx_1", xx_1);
db.update("xxx", values, " _id = ? ", new String[]{id+""});
db.close();
}
}
//得到所有的数据记录
public List<String> findAll(){
List<String> xx_1= new ArrayList<String>();
SQLiteDatabase db = mOpenHelper.getReadableDatabase();
if(db.isOpen()){
Cursor c = db.query("xxx", new String[]{"xx_1"}, null, null, null, null, null);
while(c.moveToNext()){
String xx= c.getString(0);
xx_1.add(xxx);
}
c.close();
db.close();
}
return xx_1;
}

}