实际开发中可以利用javaAPI去操作控制Hbase
【准备】
1：开启集群，一次开启（zookeeper，hdfs，hbase）
2：创建项目，导入jar
3：代码实现
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.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.HTableInterface;
import org.apache.hadoop.hbase.client.HTablePool;
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;
import org.junit.Before;
import org.junit.Test;
public class HbaseDemo {
private Configuration conf = null;
@Before
public void init(){
conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "hadoop2004:2181,hadoop2005:2181,hadoop2006:2181");
}
@Test
public void testPut() throws Exception{
HTable table = new HTable(conf, "tab_dog");
Put put = new Put(Bytes.toBytes("rk0001"));
put.add(Bytes.toBytes("info"),Bytes.toBytes("name"),Bytes.toBytes("旺财"));
put.add(Bytes.toBytes("info"),Bytes.toBytes("age"),Bytes.toBytes("3"));
put.add(Bytes.toBytes("info"),Bytes.toBytes("sex"),Bytes.toBytes("boy"));
table.put(put);
table.close();
}
@Test
public void testPutAll() throws Exception{
HTable table = new HTable(conf, "tab_dog");
List<Put> puts = new ArrayList<Put>(10000);
for(int i=0 ; i<1000000; i++){
Put put = new Put(Bytes.toBytes("rk"+i));
put.add(Bytes.toBytes("info"), Bytes.toBytes("sal"), Bytes.toBytes(""+i));
puts.add(put);
//这里防止数据量过大，内存溢出，所以10000条就插入一次，分批插入
if(i % 10000 == 0){
table.put(puts);
puts = new ArrayList<Put>(10000);
}
}
table.put(puts);
table.close();
}
@Test
public void testGet() throws Exception{
//HTablePool pool = new HTablePool(conf, 10);
//HTable table = (HTable) pool.getTable("user");
HTable table = new HTable(conf, "tab_dog");
Get get = new Get(Bytes.toBytes("rk0001"));
//get.addColumn(Bytes.toBytes("info"), Bytes.toBytes("name"));
get.setMaxVersions(5);
Result result = table.get(get);
//result.getValue(family, qualifier)
for(KeyValue kv: result.list()){
String family = new String(kv.getFamily());
String qualifier = new String(kv.getQualifier());
String value = new String(kv.getValue());
System.out.println(family + " " + qualifier + " : "+ value);
}
table.close();
}
@Test
public void testScan() throws Exception{
HTablePool pool = new HTablePool(conf,1000);
HTableInterface table = pool.getTable("user");
Scan scan = new Scan(Bytes.toBytes("rk0001"),Bytes.toBytes("rk0002"));
scan.addFamily(Bytes.toBytes("info"));
ResultScanner scanner = table.getScanner(scan);
for(Result r : scanner){
byte[] name = r.getValue(Bytes.toBytes("info"), Bytes.toBytes("name"));
byte[] age = r.getValue(Bytes.toBytes("info"), Bytes.toBytes("age"));
byte[] sex = r.getValue(Bytes.toBytes("info"), Bytes.toBytes("sex"));
System.out.println(new String(name) + " : " + new String(age) + " : " + new String(sex));
}
pool.close();
}
@Test
public void testDel() throws Exception{
HTable table = new HTable(conf,"tab_dog");
Delete del = new Delete(Bytes.toBytes("rk0001"));
del.deleteColumn(Bytes.toBytes("info"), Bytes.toBytes("name"));
table.delete(del);
table.close();
}
@Test
public void testDrop() throws Exception{
HBaseAdmin admin = new HBaseAdmin(conf);
admin.disableTable("tab_dog");
admin.deleteTable("tab_dog");
admin.close();
}
@Test
public void testCreate() throws Exception {
//设置操作用户（建表要有用户，谁建的）
HBaseAdmin admin = new HBaseAdmin(conf);
//创建表信息（表名）
HTableDescriptor desc = new HTableDescriptor(TableName.valueOf("tab_dog"));
//创建列族
HColumnDescriptor cd = new HColumnDescriptor("info");
cd.setMaxVersions(10);
//添加列族
desc.addFamily(cd);
//创建表
admin.createTable(desc);
admin.close();
}
}
2016-12-23_175418.png
/*
* 创建一个students表,并进行相关操作
*/
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 HBaseJavaAPI {
// 声明静态配置
private static Configuration conf = null;
static {
conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "192.168.6.91");
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()));
}
}
}
// 主函数
public static void main(String[] args) {
try {
String tableName = "student";
// 第一步：创建数据库表：“student”
String[] columnFamilys = { "info", "course" };
HBaseJavaAPI.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)) {
HBaseJavaAPI.addRow(tableName, "zpc", "info", "age", "20");
HBaseJavaAPI.addRow(tableName, "zpc", "info", "sex", "boy");
HBaseJavaAPI.addRow(tableName, "zpc", "course", "china", "97");
HBaseJavaAPI.addRow(tableName, "zpc", "course", "math", "128");
HBaseJavaAPI.addRow(tableName, "zpc", "course", "english", "85");
// 添加第二行数据
HBaseJavaAPI.addRow(tableName, "henjun", "info", "age", "19");
HBaseJavaAPI.addRow(tableName, "<span style="font-family: Arial, Helvetica, sans-serif;">henjun</span>", "info", "sex", "boy");
HBaseJavaAPI.addRow(tableName, "henjun", "course", "china","90");
HBaseJavaAPI.addRow(tableName, "henjun", "course", "math","120");
HBaseJavaAPI.addRow(tableName, "henjun", "course", "english","90");
// 添加第三行数据
HBaseJavaAPI.addRow(tableName, "niaopeng", "info", "age", "18");
HBaseJavaAPI.addRow(tableName, "<span style="font-family: Arial, Helvetica, sans-serif;">niaopeng</span>", "info", "sex","girl");
HBaseJavaAPI.addRow(tableName, "niaopeng", "course", "china","100");
HBaseJavaAPI.addRow(tableName, "niaopeng", "course", "math","100");
HBaseJavaAPI.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*************");
HBaseJavaAPI.getRow(tableName, "zpc");
// 第四步：获取所有数据
System.out.println("**************获取所有数据***************");
HBaseJavaAPI.getAllRows(tableName);
// 第五步：删除一条数据
System.out.println("************删除一条(zpc)数据************");
HBaseJavaAPI.delRow(tableName, "zpc");
HBaseJavaAPI.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" };
HBaseJavaAPI.delMultiRows(tableName, rows);
HBaseJavaAPI.getAllRows(tableName);
// 第七步：删除数据库
System.out.println("***************删除数据库表**************");
HBaseJavaAPI.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();
}
}
}
