创建数据库并使用

1.创建数据库类继承SQLiteOpenHelper，在重写的onCreate()方法中调用 db.execSQL(CREATE_BOOK)sql语句创建数据库，名称为Book。

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public static final String CREATE_BOOK = "create table Book ("
            + "phone integer primary key , "
            + " username text , "
            + "images BLOB ,"
            + "password text )";
    public static final String CREATE_ADDRESS = "create table Address ("
            + "number text , "
            + "name text )";
    private Context mContext;
    public MyDatabaseHelper(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
        mContext = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_BOOK);
        db.execSQL(CREATE_ADDRESS);
        Toast.makeText(mContext, "Create succeeded", Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {

    }
}

2.在活动中使用SQLiteDatabase进行增删改查

      MyDatabaseHelper dbHelper_address = new MyDatabaseHelper(getActivity(), "BookStore.db", null, 1);
      SQLiteDatabase db_address = dbHelper_address.getWritableDatabase();
      db_address.execSQL("delete from Address where name = ?", new String[]{name1});;//删除
      
      db_address.execSQL("insert into Address (number, name) values( ? , ?)",
                    new String[]{number, name});//增加
      
      Cursor cursorsearch = db_address.rawQuery("select * from Address where name like '%"+search+"%'" , null);
                            while (cursorsearch.moveToNext()) {
                                @SuppressLint("Range") String sname = cursorsearch.getString(cursorsearch.getColumnIndex("name"));
                                @SuppressLint("Range") String snumber = cursorsearch.getString(cursorsearch.getColumnIndex("number"));
                                Address_item_bean searchInfo = new Address_item_bean(sname, snumber);
                                list2.add(searchInfo);  }
                            cursorsearch.close();//查询