Question

我在我的android数据库中使用此查询：

  public String getauthWithid() {
    String query = new String( "select login from table_inscri where ID = 1" );
    Cursor result = bdd.rawQuery( query, null );
    return result.toString();}

但是当我调用此方法时，它会返回android.database.sqlite.SQliteCursor@

那么当id = 1时如何选择列？

Answer 1

编辑：正如格雷厄姆指出的那样，你将不得不关闭光标。所以使用下面的代码

result.moveToFirst();
String auth = result.getString(result.getColumnIndex(COLUMN_NAME));
result.close();
return auth;

Answer 2

这是正确的做法。为了防止错误。

public String getauthWithid() {
   String query = new String( "select login from table_inscri where ID = 1" );
   Cursor result = bdd.rawQuery( query, null );

   String returnString = ""; // Your default if none is found

  if(result.moveToFirst())
  {
    returnString = result.getString(result.getColumnIndex("login"));
  }
  result.close();

  return returnString;
}

Answer 3

使用它应该从数据集的列中获取数据。

if (result != false) 
{
    result.moveToFirst(); // moves the cursor to the first record        
    do 
    {
        result.getString(0); // gets the data in that record
        // process string here 
        // - such as add to an arrayList and then return the list after the loop
    } 
    while (result.moveToNext()); 
    // return list here
}

Answer 4

Cursor cursor = db.rawQuery("select login from table_inscri where ID='" + 1
            + "'", null);

Answer 5

进入你的sqlite shell：

$ sqlite3 path/to/db.sqlite3

一旦进入，只需点击sqlite> .schema

你会得到一切。

如何从SQlite表中选择列？

5 个答案: