Hbase CRUD Operations(Java API)

最新推荐文章于 2021-06-29 00:16:10 发布

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本文详细介绍了HBase中Put和Delete方法的使用方法及原子操作特性，包括构造方法、add()、delete()等关键API，并提供了实例代码帮助理解。

Put Method

void put(Put put)throws IOException

Put的构造方法

Put(byte[] row)
Put(byte[] row,RowLock rowLock)
Put(byte[] row,long ts)
Put(byte[] row,long ts,RowLock rowLock)

add()

Put add(byte[] family,byte[] qualifier,byte[] value)
Put add(byte[] family,byte[] qualifier,long ts,byte[]
value)
Put add(KeyValue kv)throws IOException

Each call to add() specifies exactly one column,or,in combination with an optional timestamp,one single cell.

原子操作

boolean checkAndPut(Bytes.toBytes("item"), Bytes.toBytes("happy"),
				Bytes.toBytes("live"), null, put1)

delete()

void delete(Delete delete)throws IOException

Delete(byte[] row)
Delete(byte[] row,long timestamp,RowLock rowLock)

原子操作

boolean checkAndDelete(byte[] row,byte[] family,byte[]
qualifier,byte[] value,Delete delete)throws IOException

Delete deleteFamily(byte[] family)
Delete deleteFamily(byte[] family,long timestamp)//the timestamp matches the same and all older versions of all columns
Delete deleteColumns(byte[] family,byte[] qualifier)
Delete deleteColumns(byte[] family,byte[] qualifier,long
timestamp)
Delete deleteColumn(byte[] family,byte[] qualifier)
Delete deleteColumn(byte[] family,byte[] qualifier,long
timestamp)
void setTimestamp(long timestamp)

get()

List<KeyValue> get(byte[] family,byte[] qualifier)

Map<byte[] ,List<KeyValue>>getFamilyMap()

Get addFamily(byte[] family)
Get addColumn(byte[] family,byte[] qualifier)
Get setTimeRange(long minStamp,long maxStamp)throws
IOException
Get setTimeStamp(long timestamp)
Get setMaxVersions()
Get setMaxVersions(int maxVersions)throws IOException

has()

boolean has(byte[]family,byte[] qualifier)
boolean has(byte[]family,byte[] qualifier,long ts)
boolean has(byte[]family,byte[] qualifier,byte[] value)
boolean has(byte[]family,byte[] qualifier,long ts,byte[] value)

Example

public class PutExample{
public static void main(String[] args)throws IOException
{
Configuration conf= HBaseConfiguration.create();//hbase-default.xml and hbase-site.xml
HTable table= newHTable(conf,"testtable");
Put put= new Put(Bytes.toBytes("row1"));
//org.apache.hadoop.hbase.util.Bytes
put.add(Bytes.toBytes("colfam1"),
Bytes.toBytes("qual1"),
Bytes.toBytes("val1"));
put.add(Bytes.toBytes("colfam1"),
Bytes.toBytes("qual2"),
Bytes.toBytes("val2"));
table.put(put);
}
}