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

     private static final String CREATE_CONTACTS = "create table contact ("
             + "id integer primary key autoincrement, "
             + "name text, "
             + "number text )";

     public MyDatabaseHelper(Context context, String name, CursorFactory factory, int version) {
         super(context, name, factory, version);
     }

     @Override
     public void onCreate(SQLiteDatabase db) {
         db.execSQL(CREATE_CONTACTS);
     }

2.查询 根据searchName查询表单

     private void searchContact(String searchName) {
         db = dbHelper.getReadableDatabase();
         //Cursor cursor = db.query("contact", new String[] {"name"}, "name = ?", new String[] {searchName}, null, null, null);
         Cursor cursor = db.rawQuery("select * from contact where name = ?", new String[] {searchName});
         if(cursor.moveToFirst()) {
             //String name = cursor.getString(cursor.getColumnIndex("name"));
             String number = cursor.getString(cursor.getColumnIndex("number"));
             tv_name.setText(searchName);
             tv_number.setText(number);
             tel = "tel:" + number;
         }else {
             tv_name.setText("404! Not Found");
             tv_number.setText("10086");
             tel = "tel:10086";
         }
         cursor.close();
         db.close();
     }

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。

转载请注明出处：http://www.cnblogs.com/michaelwong/p/4128299.html