按条件查询与删除数据-----HBase(伪分布)学习笔记

/*
* 删除RowKey所有行
* 非空判断√
*/

public static void deleteRows(String tablename,String RowKey){
HTable h=null;
HBaseAdmin ha=null;
Get get=new Get(Bytes.toBytes(RowKey));
try{
ha=new HBaseAdmin(config);
if(ha.tableExists(tablename)){
h=new HTable(config,tablename);
Delete d=new Delete(Bytes.toBytes(RowKey));
if(h.exists(get)){
h.delete(d);
System.out.println("删除成功");
}else{
System.out.println("滚犊子!!!");
}
}else{
System.out.println("表呢？你的表那！！");
}
}catch(Exception e){
e.printStackTrace();
}finally{
try {
h.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

/*
* 删除指定一行的数据
*
*/

public static void deleteRow(String tablename,String RowKey,String family,String qualifier){
HTable h=null;
try {
h=new HTable(config,tablename);
Delete d=new Delete(Bytes.toBytes(RowKey));
d.deleteColumn(Bytes.toBytes(family), Bytes.toBytes(qualifier));
h.delete(d);
System.out.println("删除成功!");
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
h.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

/*
* 按条件查询（应用filter）
*/

@SuppressWarnings("deprecation")
public static void GetByParam(String tablename,String Family,String qualifier,String value){
HTable h=null;
ResultScanner rs=null;
try {
h=new HTable(config,tablename);
Filter f=new SingleColumnValueFilter(Bytes.toBytes(Family),Bytes.toBytes(qualifier),CompareOp.EQUAL,Bytes.toBytes(value) );
Scan scan=new Scan();
scan.setFilter(f);
scan.addColumn(Bytes.toBytes(Family),Bytes.toBytes(qualifier));
rs=h.getScanner(scan);
System.out.println("行     列簇     列名     值             时间戳");
for (Result r : rs) {
for (KeyValue kv : r.raw()) {
System.out.println(kv.getRowOffset()+"    "+Family+"       "+qualifier+"    "+new String(kv.getValue())+"    "+ kv.getTimestamp());
}
}
} catch (IOException e) {
e.printStackTrace();
}finally{
try{
rs.close();
h.close();
}catch(Exception e){
e.printStackTrace();
}
}
}

/*
* 按条件查询value
* 参数：表名，行，列簇，列名
*/

public static void get(String tablename,String rowKey,String Family,String qualifier)throws Exception{
HConnection connection = HConnectionManager.createConnection(config);
HTableInterface table = connection.getTable(TableName.valueOf(tablename));
try {
System.out.println("开始获取------哔哔哔");
Get get=new Get(rowKey.getBytes());
get.addColumn(Family.getBytes(), qualifier.getBytes());
Result r=table.get(get);
for(KeyValue kv:r.raw())
{
System.out.println("您要查的值为"+new String(kv.getValue()));
}
} finally {
table.close();
connection.close();
}
}