android - 遍历来自 Sqlite-query 的行

Question

我有一个表格布局，我想用数据库查询的结果填充它。我使用全选，查询返回四行数据。

我使用此代码来填充表格行内的 TextView。

Cursor c = null;
c = dh.getAlternative2();
startManagingCursor(c);
// the desired columns to be bound
String[] columns = new String[] {DataHelper.KEY_ALT};
// the XML defined views which the data will be bound to
int[] to = new int[] { R.id.name_entry};

SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, 
         R.layout.list_example_entry, c, columns, to);
this.setListAdapter(mAdapter);

我希望能够将 KEY_ALT 的四个不同值分开，并选择它们的去向。我希望他们填充四个不同的 TextView，而不是上面示例中的一个。

如何遍历生成的光标？

score 111 · Accepted Answer

Cursor数据库查询返回的对象位于第一个条目之前，因此迭代可以简化为：

while (cursor.moveToNext()) {
    // Extract data.
}

参考来自SQLiteDatabase。

score 82 · Accepted Answer

您可以使用下面的代码来遍历光标并将它们存储在字符串数组中，然后可以在四个文本视图中设置它们

String array[] = new String[cursor.getCount()];
i = 0;

cursor.moveToFirst();
while (!cursor.isAfterLast()) {
    array[i] = cursor.getString(0);
    i++;
    cursor.moveToNext();
}

score 29 · Accepted Answer

for (boolean hasItem = cursor.moveToFirst(); hasItem; hasItem = cursor.moveToNext()) {
    // use cursor to work with current item
}

score 20 · Accepted Answer

可以通过以下方式进行迭代：

Cursor cur = sampleDB.rawQuery("SELECT * FROM " + Constants.TABLE_NAME, null);
ArrayList temp = new ArrayList();
if (cur != null) {
    if (cur.moveToFirst()) {
        do {
            temp.add(cur.getString(cur.getColumnIndex("Title"))); // "Title" is the field name(column) of the Table                 
        } while (cur.moveToNext());
    }
}

score 4 · Accepted Answer

找到了一种非常简单的方法来遍历游标

for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()){


    // access the curosr
    DatabaseUtils.dumpCurrentRowToString(cursor);
    final long id = cursor.getLong(cursor.getColumnIndex(BaseColumns._ID));


}

score 3 · Accepted Answer

我同意 chiranjib，我的代码如下：

if(cursor != null && cursor.getCount() > 0){
  cursor.moveToFirst();
  do{
    //do logic with cursor.
  }while(cursor.moveToNext());
}

score 0 · Accepted Answer

public void SQLfunction() {
    SQLiteDatabase db = getReadableDatabase();
    SQLiteQueryBuilder qb = new SQLiteQueryBuilder();

    String[] sqlSelect = {"column1","column2" ...};
    String sqlTable = "TableName";
    String selection = "column1= ?"; //optional
    String[] selectionArgs = {Value}; //optional

    qb.setTables(sqlTable);
    final Cursor c = qb.query(db, sqlSelect, selection, selectionArgs, null, null, null);

   if(c !=null && c.moveToFirst()){
        do {
           //do operations
           // example : abcField.setText(c.getString(c.getColumnIndex("ColumnName")))

          }
        while (c.moveToNext());
    }


}

注意：要使用 SQLiteQueryBuilder() 您需要添加

在你的成绩文件中编译'com.readystatesoftware.sqliteasset:sqliteassethelper:+'

android - 遍历来自 Sqlite-query 的行

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