在上一篇中大數(shù)據(jù)學習系列之二 ----- HBase環(huán)境搭建(單機) 中,成功搭建了Hadoop+HBase的環(huán)境,本文則主要講述使用Java 對HBase的一些操作。
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import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
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.Table;
import org.apache.hadoop.hbase.util.Bytes;
import com.alibaba.fastjson.JSONObject;
/**
*
* Title: HBaseUtil
* Description: HBase工具類
* Version:1.0.0
* @author pancm
* @date 2017年12月6日
*/
public class HBaseUtil {
/** hadoop 連接 */
private static Configuration conf = null;
/** hbase 連接 */
private static Connection con = null;
/** 會話 */
private static Admin admin = null;
private static String ip ="master";
private static String port ="2181";
private static String port1 ="9001";
// 初始化連接
static {
// 獲得配制文件對象
conf = HBaseConfiguration.create();
// 設(shè)置配置參數(shù)
conf.set("hbase.zookeeper.quorum", ip);
conf.set("hbase.zookeeper.property.clientPort", port);
//如果hbase是集群,這個必須加上
//這個ip和端口是在hadoop/mapred-site.xml配置文件配置的
conf.set("hbase.master", ip+":"+port1);
}
/**
* 獲取連接
*
* @return
*/
public synchronized static Connection getConnection() {
try {
if (null == con || con.isClosed()) {
// 獲得連接對象
con = ConnectionFactory.createConnection(conf);
}
} catch (IOException e) {
System.out.println("獲取連接失敗!");
e.printStackTrace();
}
return con;
}
/**
* 連接關(guān)閉
*/
public static void close() {
try {
if (admin != null) {
admin.close();
}
if (con != null) {
con.close();
}
} catch (IOException e) {
System.out.println("連接關(guān)閉失敗!");
e.printStackTrace();
}
}
/**
* 創(chuàng)建表
*
* @param tableName
* 表名
* @param columnFamily
* 列族
*/
public static void creatTable(String tableName, String[] columnFamily) {
if(null==tableName||tableName.length()==0){
return;
}
if(null==columnFamily||columnFamily.length==0){
return;
}
// 創(chuàng)建表名對象
TableName tn = TableName.valueOf(tableName);
// a.判斷數(shù)據(jù)庫是否存在
try {
// 獲取會話
admin = getConnection().getAdmin();
if (admin.tableExists(tn)) {
System.out.println(tableName + " 表存在,刪除表....");
// 先使表設(shè)置為不可編輯
admin.disableTable(tn);
// 刪除表
admin.deleteTable(tn);
System.out.println("表刪除成功.....");
}
// 創(chuàng)建表結(jié)構(gòu)對象
HTableDescriptor htd = new HTableDescriptor(tn);
for (String str : columnFamily) {
// 創(chuàng)建列族結(jié)構(gòu)對象
HColumnDescriptor hcd = new HColumnDescriptor(str);
htd.addFamily(hcd);
}
// 創(chuàng)建表
admin.createTable(htd);
System.out.println(tableName + " 表創(chuàng)建成功!");
} catch (IOException e) {
e.printStackTrace();
} finally {
close();
}
}
/**
* 數(shù)據(jù)單條插入或更新
*
* @param tableName
* 表名
* @param rowKey
* 行健 (主鍵)
* @param family
* 列族
* @param qualifier
* 列
* @param value
* 存入的值
* @return
*/
public static void insert(String tableName, String rowKey, String family,
String qualifier, String value) {
Table t = null;
try {
t = getConnection().getTable(TableName.valueOf(tableName));
Put put = new Put(Bytes.toBytes(rowKey));
put.addColumn(Bytes.toBytes(family), Bytes.toBytes(qualifier),
Bytes.toBytes(value));
t.put(put);
System.out.println(tableName + " 更新成功!");
} catch (IOException e) {
System.out.println(tableName + " 更新失敗!");
e.printStackTrace();
} finally {
close();
}
}
/**
* 數(shù)據(jù)批量插入或更新
*
* @param tableName
* 表名
* @param list
* hbase的數(shù)據(jù)
* @return
*/
public static void insertBatch(String tableName, List> list) {
if (null == tableName ||tableName.length()==0) {
return;
}
if( null == list || list.size() == 0){
return;
}
Table t = null;
Put put = null;
JSONObject json = null;
List puts = new ArrayList();
try {
t = getConnection().getTable(TableName.valueOf(tableName));
for (int i = 0, j = list.size(); i < j; i++) {
json = (JSONObject) list.get(i);
put = new Put(Bytes.toBytes(json.getString("rowKey")));
put.addColumn(Bytes.toBytes(json.getString("family")),
Bytes.toBytes(json.getString("qualifier")),
Bytes.toBytes(json.getString("value")));
puts.add(put);
}
t.put(puts);
System.out.println(tableName + " 更新成功!");
} catch (IOException e) {
System.out.println(tableName + " 更新失敗!");
e.printStackTrace();
} finally {
close();
}
}
/**
* 數(shù)據(jù)刪除
* @param tableName 表名
* @param rowKey 行健
* @return
*/
public static void delete(String tableName, String rowKey) {
delete(tableName,rowKey,"","");
}
/**
* 數(shù)據(jù)刪除
* @param tableName 表名
* @param rowKey 行健
* @param family 列族
* @return
*/
public static void delete(String tableName, String rowKey, String family) {
delete(tableName,rowKey,family,"");
}
/**
* 數(shù)據(jù)刪除
* @param tableName 表名
* @param rowKey 行健
* @param family 列族
* @param qualifier 列
* @return
*/
public static void delete(String tableName, String rowKey, String family,
String qualifier) {
if (null == tableName ||tableName.length()==0) {
return;
}
if( null == rowKey || rowKey.length() == 0){
return;
}
Table t = null;
try {
t = getConnection().getTable(TableName.valueOf(tableName));
Delete del = new Delete(Bytes.toBytes(rowKey));
// 如果列族不為空
if (null != family && family.length() > 0) {
// 如果列不為空
if (null != qualifier && qualifier.length() > 0) {
del.addColumn(Bytes.toBytes(family),
Bytes.toBytes(qualifier));
} else {
del.addFamily(Bytes.toBytes(family));
}
}
t.delete(del);
} catch (IOException e) {
System.out.println("刪除失敗!");
e.printStackTrace();
} finally {
close();
}
}
/**
* 查詢該表中的所有數(shù)據(jù)
*
* @param tableName
* 表名
*/
public static void select(String tableName) {
if(null==tableName||tableName.length()==0){
return;
}
Table t = null;
List
import java.util.ArrayList;
import java.util.List;
import com.alibaba.fastjson.JSONObject;
/**
*
* Title: hbaseTest
* Description: HBase 相關(guān)測試
* Version:1.0.0
* @author pancm
* @date 2017年11月23日
*/
public class hbaseTest {
public static void main(String[] args) {
test();
}
/**
* 一些測試
*/
private static void test() {
String tableName1="t_student",tableName2="t_student_info";
String []columnFamily1={"st1","st2"};
String []columnFamily2={"stf1","stf2"};
HBaseUtil.creatTable(tableName1, columnFamily1);
HBaseUtil.creatTable(tableName2, columnFamily2);
HBaseUtil.insert(tableName1, "1001", columnFamily1[0], "name", "zhangsan");
HBaseUtil.insert(tableName1, "1002", columnFamily1[0], "name", "lisi");
HBaseUtil.insert(tableName1, "1001", columnFamily1[1], "age", "18");
HBaseUtil.insert(tableName1, "1002", columnFamily1[1], "age", "20");
HBaseUtil.insert(tableName2, "1001", columnFamily2[0], "phone", "123456");
HBaseUtil.insert(tableName2, "1002", columnFamily2[0], "phone", "234567");
HBaseUtil.insert(tableName2, "1001", columnFamily2[1], "mail", "123@163.com");
HBaseUtil.insert(tableName2, "1002", columnFamily2[1], "mail", "234@163.com");
HBaseUtil.select(tableName1); //查詢該表所有數(shù)據(jù)
HBaseUtil.select(tableName1, "1001"); //根據(jù)表名和行健查詢
HBaseUtil.select(tableName2, "1002",columnFamily2[0]); //根據(jù)表名、行健和列族查詢
HBaseUtil.select(tableName2, "1002",columnFamily2[1],"mail"); //根據(jù)表名、行健、列族、和列查詢
HBaseUtil.select(tableName1, "1002"); //根據(jù)表名和行健查詢
HBaseUtil.delete(tableName1, "1002", columnFamily1[0]);//刪除數(shù)據(jù)
HBaseUtil.select(tableName1, "1002"); //根據(jù)表名和行健查詢
}
}
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