Question

朋友，

我正在尝试删除行，然后当我尝试从数据库中获取所有记录时我得到例外任何一个人指导我，我在做什么错误？

private static final String DATABASE_NAME = "example.db";
   private static final int DATABASE_VERSION = 1;
   private static final String TABLE_NAME = "table1";

   private Context context;
   private SQLiteDatabase db;

 public dbHelper(Context context) {
      this.context = context;
      OpenHelper openHelper = new OpenHelper(this.context);
      this.db = openHelper.getWritableDatabase();
      this.insertStmt = this.db.compileStatement(INSERT);
   }


    public List<String> selectAll() {
          List<String> list = new ArrayList<String>();
          Cursor cursor = this.db.query(TABLE_NAME, new String[] { "name" }, 
            null, null, null, null, "name desc");
          if (cursor.moveToFirst()) {
             do {
                list.add(cursor.getString(0));
             } while (cursor.moveToNext());
          }
          if (cursor != null && !cursor.isClosed()) {
             cursor.close();
          }
          return list;
       }

       public int DeleteName(String name)
       {
           int rowsEffected = this.db.delete(TABLE_NAME,"name=?", new String[] {name});
           this.db.close();
           return rowsEffected;
       }

任何帮助将不胜感激。

Answer 1

在调用selectAll（）之前你打开过db吗？你在删除方法中关闭了它。

无论如何，在使用它之前打开db并在工作完成后关闭它是一个好习惯。

行删除后的SQLite数据提取问题？

1 个答案: