Java 获取行 HBase 的特定列族中的列
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Get Columns in a specific Column Family for a row HBase
提问by Mahdi
I'm writing a application that shows data in a specific table in HBase by JSP. I want to get all columns in a specific column family for a row.
我正在编写一个应用程序，通过 JSP 显示 HBase 中特定表中的数据。我想为一行获取特定列族中的所有列。
is there any way for do this?
有没有办法做到这一点？
采纳答案by Mahdi
public String[] getColumnsInColumnFamily(Result r, String ColumnFamily)
{
NavigableMap<byte[], byte[]> familyMap = r.getFamilyMap(Bytes.toBytes(ColumnFamily));
String[] Quantifers = new String[familyMap.size()];
int counter = 0;
for(byte[] bQunitifer : familyMap.keySet())
{
Quantifers[counter++] = Bytes.toString(bQunitifer);
}
return Quantifers;
}
Result r is as a desirable row.
结果 r 是理想的行。
回答by Arnon Rotem-Gal-Oz
If you are just interested in a single family you can set the scanner to fetch only that family
如果您只对一个家庭感兴趣，您可以将扫描仪设置为仅获取该家庭
Scan scan = new Scan(Bytes.toBytes(startKey),Bytes.toBytes(endKey);
scan.addFamily(Bytes.toBytes(familyName));
