Question

我是cassandra的新bie，我想在列计数器系列中获取多个行键，就像MultigetSliceQuery一样。是否有可能??? 例如我的colunfamily定义是

create column family MyCounters 
with default_validation_class=CounterColumnType 
and comparator=UTF8Type;

和数据结构

RowKey:111111
=>name=like, value=2222
=>name=share, value=2542
=>name=comment, value=3532

RowKey:111112
=>name=like, value=2542
=>name=share, value=25524
=>name=comment, value=32

RowKey:111113
=>name=like, value=22
=>name=share, value=22
=>name=comment, value=32

RowKey:111114
=>name=like, value=22
=>name=share, value=542
=>name=comment, value=332

RowKey:111115
=>name=like, value=949
=>name=share, value=226
=>name=comment, value=342

现在我想使用multi getslice query获取所有行键。是否可以使用多重切片查询或任何其他查询来获取记录？

Answer 1

最后我得到了解决方案

MultigetSliceCounterQuery<String, String> query=HFactory.createMultigetSliceCounterQuery(keyspace, se, se);
query.setColumnFamily("MyCounters").setKeys(list).setRange(null, null, false, 3);
CounterRows<String,String> resultRows1 = query.execute().get();

for (CounterRow<String, String> row : resultRows1) {
    System.out.println("Row Key "+ row.getKey());
    for (HCounterColumn<String> col : row.getColumnSlice().getColumns())
        System.out.println("column Name "+col.getName()+"column value "+col.getValue());
    }
}

Answer 2

使用昆德拉。运行简单的JPQL以获得多个结果。

如何从Cassandra中的计数器列族获取多行键值。

2 个答案: