package com.snglw.basic;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.coprocessor.AggregationClient;
import org.apache.hadoop.hbase.client.coprocessor.LongColumnInterpreter;
import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.hadoop.hbase.filter.FilterList.Operator;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;
import com.snglw.util.ConnectInit;
public class BasicOperator {
ConnectInit ci = new ConnectInit();
Configuration conf = ci.getConfiguration();
/*建表与删表*/
public void createTable(){
String tableName = "user";
HTableDescriptor htd = new HTableDescriptor(TableName.valueOf(tableName));
HColumnDescriptor hcd = new HColumnDescriptor("info");
htd.addFamily(hcd);
HBaseAdmin admin = null;
try
{
admin = new HBaseAdmin(conf);
if (admin.tableExists(tableName)){
admin.disableTable(tableName);
admin.deleteTable(tableName);
}else{
admin.createTable(htd);
System.out.println("Table Created!");
}
}catch(IOException e){
e.printStackTrace();
}
finally{
if(admin != null){
try{
admin.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
}
/*修改表（注意：修改表或者列时，只有表的Enabled属性为false时才能生效）*/
public void modifyTable(){
//指定表名
String tableName = "user";
//指定列族名
byte[] familyName = Bytes.toBytes("education");
HBaseAdmin admin = null;
try{
//实例化HBaseAdmin对象
admin = new HBaseAdmin(conf);
//获取表描述信息对象
HTableDescriptor htd = admin.getTableDescriptor(Bytes.toBytes(tableName));
//修改前，判断表是否有指定列族
if(!htd.hasFamily(familyName)){
//创建列描述信息
HColumnDescriptor hcd = new HColumnDescriptor(familyName);
htd.addFamily(hcd);
//修改表前，需要disable表，使其下线
admin.disableTable(tableName);
//提交modifyTable请求
admin.modifyTable(tableName, htd);
//修改完成之后，使表上线
admin.enableTable(tableName);
}
}catch(IOException e){
e.printStackTrace();
}finally{
if(admin != null){
try {
admin.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/*插入数据*/
public void put(){
//指定表名
String tableName = "user";
//指定列族名
byte[] familyName = Bytes.toBytes("info");
//指定列名
byte[][] qualifiers = {Bytes.toBytes("name"),Bytes.toBytes("gender"),
Bytes.toBytes("age"),Bytes.toBytes("address")};
HTable table = null;
try{
//实例化一个HTable对象
table = new HTable(conf,tableName);
List puts = new ArrayList();
//实例化一个Put对象
Put put = new Put(Bytes.toBytes("012005000201"));
put.addImmutable(familyName, qualifiers[0],Bytes.toBytes("张三"));
put.addImmutable(familyName, qualifiers[1],Bytes.toBytes("男"));
put.addImmutable(familyName, qualifiers[2],Bytes.toBytes(new Long(19)));
put.addImmutable(familyName, qualifiers[3],Bytes.toBytes("广东省深圳市"));
puts.add(put);
put = new Put(Bytes.toBytes("012005000202"));
put.addImmutable(familyName, qualifiers[0],Bytes.toBytes("李"));
put.addImmutable(familyName, qualifiers[1],Bytes.toBytes("女"));
put.addImmutable(familyName, qualifiers[2],Bytes.toBytes(new Long(23)));
put.addImmutable(familyName, qualifiers[3],Bytes.toBytes("山西省大同市"));
puts.add(put);
put = new Put(Bytes.toBytes("012005000203"));
put.addImmutable(familyName, qualifiers[0],Bytes.toBytes("王"));
put.addImmutable(familyName, qualifiers[1],Bytes.toBytes("男"));
put.addImmutable(familyName, qualifiers[2],Bytes.toBytes(new Long(26)));
put.addImmutable(familyName, qualifiers[3],Bytes.toBytes("浙江省宁波市"));
puts.add(put);
//提交put数据请求
table.put(puts);
}catch(IOException e){
e.printStackTrace();
}finally{
if(table != null){
try{
//关闭HTable对象
table.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
}
/*删除数据*/
public void delete(){
String tableName = "user";
//指定rowKey值,即编号为012005000201
byte[] rowKey = Bytes.toBytes("012005000201");
HTable table = null;
try{
table = new HTable(conf,tableName);
Delete delete = new Delete(rowKey);
//提交一次delete数据请求
table.delete(delete);
}catch(IOException e){
e.printStackTrace();
}finally{
if(table != null){
try {
table.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/*使用Get读取数据*/
public void get(){
String tableName = "user";
//指定列族名
byte[] familyName = Bytes.toBytes("info");
//指定列名
byte[][] qualifier = {Bytes.toBytes("name"),Bytes.toBytes("address")};
//指定rowKey值
byte[] rowKey = Bytes.toBytes("012005000202");
HTable table = null;
try{
table = new HTable(conf,tableName);
//实例化get对象
Get get = new Get(rowKey);
//设置列族和列名
get.addColumn(familyName,qualifier[0]);
get.addColumn(familyName,qualifier[1]);
//提交请求
Result result = table.get(get);
for(Cell cell:result.rawCells()){
System.out.println(Bytes.toString(CellUtil.cloneRow(cell))
+ ":" + Bytes.toString(CellUtil.cloneFamily(cell))
+ ":" + Bytes.toString(CellUtil.cloneQualifier(cell))
+ ":" + Bytes.toString(CellUtil.cloneValue(cell)));
}
}catch(IOException e){
e.printStackTrace();
}finally{
if(table != null){
try {
table.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/*使用scan读取数据*/
public void scan(){
String tableName = "webPage";
HTable table = null;
try{
table = new HTable(conf,tableName);
Scan scan = new Scan();
scan.addColumn(Bytes.toBytes("webPageInfo"),Bytes.toBytes("doc"));
//设置缓存大小
scan.setCaching(5000);
scan.setBatch(2);
//实例化一个ResultScanner对象
ResultScanner rScanner = null;
//提交请求
rScanner = table.getScanner(scan);
for(Result r = rScanner.next();r != null;r = rScanner.next()){
for(Cell cell:r.rawCells()){
System.out.println(Bytes.toString(CellUtil.cloneRow(cell))
+ ":" + Bytes.toString(CellUtil.cloneFamily(cell))
+ ":" + Bytes.toString(CellUtil.cloneQualifier(cell))
+ ":" + Bytes.toString(CellUtil.cloneValue(cell)));
}
}
}catch(IOException e){
e.printStackTrace();
}finally{
if(table != null){
try {
table.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/*使用过滤器*/
public void singleColumnValueFilter(){
String tableName = "user";
HTable table = null;
try{
table = new HTable(conf,tableName);
//实例化一个Scan对象
Scan scan = new Scan();
scan.addColumn(Bytes.toBytes("info"),Bytes.toBytes("name"));
//设置过滤条件
SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes("info"),Bytes.toBytes("name"),
CompareOp.EQUAL,Bytes.toBytes("王"));
scan.setFilter(filter);
//实例化ResultScanner对象
ResultScanner rScanner = null;
rScanner = table.getScanner(scan);
for(Result r = rScanner.next();r != null;r = rScanner.next()){
for(Cell cell:r.rawCells()){
System.out.println(Bytes.toString(CellUtil.cloneRow(cell))
+ ":" + Bytes.toString(CellUtil.cloneFamily(cell))
+ ":" + Bytes.toString(CellUtil.cloneQualifier(cell))
+ ":" + Bytes.toString(CellUtil.cloneValue(cell)));
}
}
}catch(IOException e){
e.printStackTrace();
}finally{
if(table != null){
try {
table.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/*使用FilterList过滤器*/
public void filterList(){
String tableName = "user";
HTable table = null;
try{
table = new HTable(conf,tableName);
//实例化一个Scan对象
Scan scan = new Scan();
scan.addColumn(Bytes.toBytes("info"),Bytes.toBytes("name"));
//实例化FilterList对象,里各个filter的是"and"关系
FilterList list = new FilterList(Operator.MUST_PASS_ALL);
//设置过滤条件（age>20的数据）
list.addFilter(new SingleColumnValueFilter(Bytes.toBytes("info"),Bytes.toBytes("age"),
CompareOp.GREATER_OR_EQUAL,Bytes.toBytes(new Long(20))));
//获取age<=29的数据
list.addFilter(new SingleColumnValueFilter(Bytes.toBytes("info"),Bytes.toBytes("age"),
CompareOp.GREATER_OR_EQUAL,Bytes.toBytes(new Long(29))));
scan.setFilter(list);
//实例化ResultScanner对象
ResultScanner rScanner = null;
rScanner = table.getScanner(scan);
for(Result r = rScanner.next();r != null;r = rScanner.next()){
for(Cell cell:r.rawCells()){
System.out.println(Bytes.toString(CellUtil.cloneRow(cell))
+ ":" + Bytes.toString(CellUtil.cloneFamily(cell))
+ ":" + Bytes.toString(CellUtil.cloneQualifier(cell))
+ ":" + Bytes.toString(CellUtil.cloneValue(cell)));
}
}
}catch(IOException e){
e.printStackTrace();
}finally{
if(table != null){
try {
table.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/*聚合函数Aggregate*/
public void aggregate(){
//指定表名
byte[] tableName = Bytes.toBytes("user");
//指定列族名
byte[] family = Bytes.toBytes("info");
AggregationClient aggregationClient = new AggregationClient(conf);
//实例化scan对象
Scan scan = new Scan();
scan.addFamily(family);
scan.addColumn(family,Bytes.toBytes("age"));
try{
//获取行数
long rowCount = aggregationClient.rowCount(TableName.valueOf(tableName),null,scan);
System.out.println("row count is "+rowCount);
//获取最大值
long max = aggregationClient.max(TableName.valueOf(tableName),new LongColumnInterpreter(),scan);
System.out.println("max number is "+max);
//获取最小值
long min = aggregationClient.min(TableName.valueOf(tableName),new LongColumnInterpreter(),scan);
System.out.println("min number is "+min);
}catch(Throwable e){
e.printStackTrace();
}
}
public static void main(String[] args){
BasicOperator bo = new BasicOperator();
bo.aggregate();
}
}
本文标题：HBase基础操作，包括表的增删改查过滤等
本文URL：
http://bzwzjz.com/article/igcppc.html
