Couldn't read row 0, col -1 from CursorWindow

java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. 

Make sure the Cursor is initialized correctly before accessing data from it. 

 

SQLiteDatabase  学习过程中，使用query() 查询表单数据时，遇到Couldn't read row 0, col -1 from CursorWindow错误。

排除建表字段错误、拼写错误、query()输入字段错误。当我使用rawQuery()方法取代query()方法，问题就解决了。

 

代码如下：

1.建表 MyDatabaseHelper

 1     private static final String CREATE_CONTACTS = "create table contact ("

 2             + "id integer primary key autoincrement, "

 3             + "name text, "

 4             + "number text )";

 5 

 6     public MyDatabaseHelper(Context context, String name, CursorFactory factory, int version) {

 7         super(context, name, factory, version);

 8     }

 9 

10     @Override

11     public void onCreate(SQLiteDatabase db) {

12         db.execSQL(CREATE_CONTACTS);        

13     }

2. 查询 根据searchName查询表单

 1     private void searchContact(String searchName) {

 2         db = dbHelper.getReadableDatabase();

 3         //Cursor cursor = db.query("contact", new String[] {"name"}, "name = ?", new String[] {searchName}, null, null, null); 

 4         Cursor cursor = db.rawQuery("select * from contact where name = ?", new String[] {searchName});

 5         if(cursor.moveToFirst()) {

 6             //String name = cursor.getString(cursor.getColumnIndex("name"));

 7             String number = cursor.getString(cursor.getColumnIndex("number"));

 8             tv_name.setText(searchName);

 9             tv_number.setText(number);

10             tel = "tel:" + number;

11         }else {

12             tv_name.setText("404! Not Found");

13             tv_number.setText("10086");

14             tel = "tel:10086";

15         }

16         cursor.close();

17         db.close();

18     }

1.当使用query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy)

String name = cursor.getString(cursor.getColumnIndex("name")) 

用这句代码检验 可以获得到name,证明cursor正确指向所要查询数据。

String number = cursor.getString(cursor.getColumnIndex("number"))

但这句代码就会报Couldn't read row 0, col -1 from CursorWindow。

getColumnIndex("number") 返回值竟然是-1，百思不得其解！

 

2.使用rawQuery(String sql, String[] selectionArgs)

name和number字段都可以准确获得，问题完美解决。

 

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