HBASE API

package org.jumore.test;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HBaseConfiguration;

import org.apache.hadoop.hbase.HColumnDescriptor;

import org.apache.hadoop.hbase.HTableDescriptor;

import org.apache.hadoop.hbase.KeyValue;

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.util.Bytes;

public class HBaseTest {

// 声明静态配置

private static Configuration conf = null;

static {

conf = HBaseConfiguration.create();

conf.set("hbase.zookeeper.quorum", "192.168.1.141,192.168.1.143,192.168.1.145");

// conf.set("hbase.zookeeper.quorum", "192.168.23.31,192.168.23.33,192.168.23.34");

// conf.set("hbase.zookeeper.quorum", "172.18.203.113,172.18.203.114,172.18.203.115,172.18.203.116");

conf.set("hbase.zookeeper.property.clientPort", "2181");

}

//判断表是否存在

private static boolean isExist(String tableName) throws IOException {

HBaseAdmin hAdmin = new HBaseAdmin(conf);

return hAdmin.tableExists(tableName);

}

// 创建数据库表

public static void createTable(String tableName, String[] columnFamilys)

throws Exception {

// 新建一个数据库管理员

HBaseAdmin hAdmin = new HBaseAdmin(conf);

if (hAdmin.tableExists(tableName)) {

System.out.println("表 "+tableName+" 已存在！");

System.exit(0);

} else {

// 新建一个students表的描述

HTableDescriptor tableDesc = new HTableDescriptor(tableName);

// 在描述里添加列族

for (String columnFamily : columnFamilys) {

tableDesc.addFamily(new HColumnDescriptor(columnFamily));

}

// 根据配置好的描述建表

hAdmin.createTable(tableDesc);

System.out.println("创建表 "+tableName+" 成功!");

}

}

// 删除数据库表

public static void deleteTable(String tableName) throws Exception {

// 新建一个数据库管理员

HBaseAdmin hAdmin = new HBaseAdmin(conf);

if (hAdmin.tableExists(tableName)) {

// 关闭一个表

hAdmin.disableTable(tableName);

hAdmin.deleteTable(tableName);

System.out.println("删除表 "+tableName+" 成功！");

} else {

System.out.println("删除的表 "+tableName+" 不存在！");

System.exit(0);

}

}

// 添加一条数据

public static void addRow(String tableName, String row,

String columnFamily, String column, String value) throws Exception {

HTable table = new HTable(conf, tableName);

Put put = new Put(Bytes.toBytes(row));// 指定行

// 参数分别:列族、列、值

put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),

Bytes.toBytes(value));

table.put(put);

}

// 删除一条(行)数据

public static void delRow(String tableName, String row) throws Exception {

HTable table = new HTable(conf, tableName);

Delete del = new Delete(Bytes.toBytes(row));

table.delete(del);

}

// 删除多条数据

public static void delMultiRows(String tableName, String[] rows)

throws Exception {

HTable table = new HTable(conf, tableName);

List<Delete> delList = new ArrayList<Delete>();

for (String row : rows) {

Delete del = new Delete(Bytes.toBytes(row));

delList.add(del);

}

table.delete(delList);

}

// 获取一条数据

public static void getRow(String tableName, String row) throws Exception {

HTable table = new HTable(conf, tableName);

Get get = new Get(Bytes.toBytes(row));

Result result = table.get(get);

// 输出结果,raw方法返回所有keyvalue数组

for (KeyValue rowKV : result.raw()) {

System.out.print("行名:" + new String(rowKV.getRow()) + " ");

System.out.print("时间戳:" + rowKV.getTimestamp() + " ");

System.out.print("列族名:" + new String(rowKV.getFamily()) + " ");

System.out.print("列名:" + new String(rowKV.getQualifier()) + " ");

System.out.println("值:" + new String(rowKV.getValue()));

}

}

// 获取所有数据

public static void getAllRows(String tableName) throws Exception {

HTable table = new HTable(conf, tableName);

Scan scan = new Scan();

ResultScanner results = table.getScanner(scan);

// 输出结果

for (Result result : results) {

for (KeyValue rowKV : result.raw()) {

// System.out.print("行名:" + new String(rowKV.getRow()) + " ");

// System.out.print("时间戳:" + rowKV.getTimestamp() + " ");

// System.out.print("列族名:" + new String(rowKV.getFamily()) + " ");

// System.out

// .print("列名:" + new String(rowKV.getQualifier()) + " ");

// System.out.println("值:" + new String(rowKV.getValue()));

String putStr = "put " + "\""+tableName+"\"" + ", " + "\"" +new String(rowKV.getRow())+ "\"" + ", " + "\""+ new String(rowKV.getFamily()) + ":" + new String(rowKV.getQualifier()) + "\""+ ", "+ "\"" + new String(rowKV.getValue())+ "\"";

System.out.println(putStr);

}

}

}

// 主函数

// public static void main(String[] args) {

// try {

// String tableName = "huym:student";

// // 第一步：创建数据库表：“student”

// String[] columnFamilys = { "info", "course" };

// HBaseTest.createTable(tableName, columnFamilys);

// // 第二步：向数据表的添加数据

// // 添加第一行数据

// if (isExist(tableName)) {

// HBaseTest.addRow(tableName, "zpc", "info", "age", "20");

// HBaseTest.addRow(tableName, "zpc", "info", "sex", "boy");

// HBaseTest.addRow(tableName, "zpc", "course", "china", "97");

// HBaseTest.addRow(tableName, "zpc", "course", "math", "128");

// HBaseTest.addRow(tableName, "zpc", "course", "english", "85");

//

// HBaseTest.addRow(tableName, "niaopeng", "course", "english","99");

// // 第三步：获取一条数据

// System.out.println("**************获取一条(zpc)数据*************");

// HBaseTest.getRow(tableName, "zpc");

// // 第四步：获取所有数据

// System.out.println("**************获取所有数据***************");

// HBaseTest.getAllRows(tableName);

//

// // 第五步：删除一条数据

// System.out.println("************删除一条(zpc)数据************");

// HBaseTest.delRow(tableName, "zpc");

// HBaseTest.getAllRows(tableName);

// // 第六步：删除多条数据

// System.out.println("**************删除多条数据***************");

// String rows[] = new String[] { "qingqing","xiaoxue" };

// HBaseTest.delMultiRows(tableName, rows);

// HBaseTest.getAllRows(tableName);

// // 第七步：删除数据库

// System.out.println("***************删除数据库表**************");

// HBaseTest.deleteTable(tableName);

// System.out.println("表"+tableName+"存在吗？"+isExist(tableName));

// } else {

// System.out.println(tableName + "此数据库表不存在！");

// }

//

// } catch (Exception e) {

// e.printStackTrace();

// }

// }

public static void main(String[] args) {

try {

String tableName = "jmnx:transaction";

// 添加第一行数据

if (isExist(tableName)) {

// 第三步：获取一条数据

//System.out.println("**************获取一条(zpc)数据*************");

//HBaseTest.getRow(tableName, "platform");

// 第四步：获取所有数据

// System.out.println("**************获取所有数据***************");

HBaseTest.getAllRows(tableName);

} else {

System.out.println(tableName + "此数据库表不存在！");

}

} catch (Exception e) {

e.printStackTrace();

}

}

}