[英]How to get all rows from Oracle NoSQL table?
如何使用Java中的TableAPI從Oracle NoSQL表中獲取所有行? 我可以通過主鍵值獲取記錄。 例:
TableAPI tableH = kvstore.getTableAPI();
Table myTable = tableH.getTable("myTable");
PrimaryKey key = myTable.createPrimaryKey();
key.put("item", "Hat");
List<Row> myRows = null;
try {
myRows = tableH.multiGet(key, null, null);
} catch (ConsistencyException ce) {
} catch (RequestTimeoutException re) {
}
for (Row theRow: myRows) {
String itemType = theRow.get("item").asString().get();
}
System.out.println(itemType);
但是我無法獲得主鍵值。
要修改您的示例,您可以通過為表使用空的PrimaryKey並使用TableAPI.tableIterator()方法之一來獲取所有行。 關於示例的注釋TableAPI.getTable()將執行遠程調用,因此應該隱藏並重用Table句柄。
TableAPI tableH = kvstore.getTableAPI();
/*
* get the Table, but be careful about doing this frequently,
* as it performs a remote call.
*/
Table myTable = tableH.getTable("myTable");
PrimaryKey key = myTable.createPrimaryKey();
try {
/* create and use an iterator on the Row value */
TableIterator<Row> rowIter = tableH.tableIterator(key, null, null);
while (rowIter.hasNext()) {
Row row = rowIter.next();
/* do something */
}
/*
* Or...
* create and use an iterator on the PrimaryKey values.
* This is much faster than fetching the data as well if
* you only need fields in the primary key.
*/
TableIterator<PrimaryKey> keyIter =
tableH.tableKeysIterator(key, null, null);
while (keyIter.hasNext()) {
PrimaryKey key = rowIter.next();
/* do something */
}
} catch (FaultException fe) {
}
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