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HBbaseUtils(HBbase shell的java代码实现)
package com.yuhui.gd.hadoop.hbase;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.Set;
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.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 HBaseUtil {
// 声明静态配置 HBaseConfiguration
static Configuration config = HBaseConfiguration.create();
static {
config.set("hbase.zookeeper.quorum", "hd204,hd205,hd206");
}
// 创建一张表，通过HBaseAdmin HTableDecriptor来创建
public static void create(String tableName, String[] columnFamilys)
throws Exception {
HBaseAdmin admin = new HBaseAdmin(config);
if (admin.tableExists(tableName)) {
System.err.println("表名为: " + tableName + " 已经存在！");
System.exit(0);
} else {
HTableDescriptor tableDescriptor = new HTableDescriptor(tableName);
for (String columnFamily : columnFamilys) {
HColumnDescriptor columnDescriptor = new HColumnDescriptor(
columnFamily);
tableDescriptor.addFamily(columnDescriptor);
}
admin.createTable(tableDescriptor);
System.out.println("Create table Success!");
}
}
// 添加一条数据，通过HTable Put为已经存在的表来添加数据
public static void put(String tableName, String row, String columnFamily,
String columnQualifer, String data) throws Exception {
HTable table = new HTable(config, tableName);
Put put = new Put(Bytes.toBytes(row));
put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(columnQualifer),
Bytes.toBytes(data));
table.put(put);
System.out.println("put ‘" + row + "‘ , ‘" + columnFamily + ":"
+ columnQualifer + "‘,‘" + data + "‘");
}
// 根据表名，行键值查询一行记录
public static void get(String tableName, String row) throws Exception {
HTable table = new HTable(config, tableName);
Get get = new Get(Bytes.toBytes(row));
Result result = table.get(get);
NavigableMap<byte[], NavigableMap<byte[], byte[]>> map = result.getNoVersionMap();
Set<Entry<byte[], NavigableMap<byte[], byte[]>>> set = map.entrySet();
System.out.println("ROW\t\tCOLUMN:CELL");
for (Entry<byte[], NavigableMap<byte[], byte[]>> entry : set) {
String familyName = new String(entry.getKey());
NavigableMap<byte[], byte[]> nmap = entry.getValue();
Set<Entry<byte[], byte[]>> valueSet = nmap.entrySet();
for (Entry<byte[], byte[]> column : valueSet) {
String columnName = new String(column.getKey());
String columnValue = http://www.mamicode.com/new String(column.getValue());
System.out.println(row + "\t\t" + familyName + ":" + columnName
+ "\t" + columnValue);
}
}
}
// 根据表名，查询全表(不包含版本信息---版本时间戳)
public static void get(String tableName) throws Exception {
HTable table = new HTable(config, tableName);
ResultScanner scanner = table.getScanner(new Scan());
Iterator<Result> itr = scanner.iterator();
System.out.println("ROW\t\t\tCOLUMN:CELL");
while (itr.hasNext()) {
Result result = itr.next();
String rowValue = http://www.mamicode.com/new String(result.getRow());
String tabCount = rowValue.length() >= 8 ? "\t" : "\t\t";
NavigableMap<byte[], NavigableMap<byte[], byte[]>> map = result.getNoVersionMap();
for (Entry<byte[], NavigableMap<byte[], byte[]>> entry : map.entrySet()) {
String family = new String(entry.getKey());
NavigableMap<byte[], byte[]> navigableMap = entry.getValue();
Set<Map.Entry<byte[], byte[]>> set = navigableMap.entrySet();
for (Entry<byte[], byte[]> en : set) {
System.out.println(rowValue + tabCount + "\t" + family
+ ":" + new String(en.getKey()) + "\t" + new String(en.getValue()));
}
}
}
}
// 根据表名，查询全表(包含版本信息---版本时间戳)
public static void get(String tableName, boolean containsTimeStamp)
throws Exception {
if (!containsTimeStamp) {
get(tableName);
} else {
HTable table = new HTable(config, tableName);
Scan scan = new Scan();
ResultScanner resultScanner = table.getScanner(scan);
Iterator<Result> resultItr = resultScanner.iterator();
System.out.println("ROW\t\t\tCOLUMN:CELL");
while (resultItr.hasNext()) {
Result result = resultItr.next();
String rowValue = http://www.mamicode.com/new String(result.getRow());
String tabCount = rowValue.length() >= 8 ? "\t" : "\t\t";
NavigableMap<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>> map = result.getMap();
Set<Map.Entry<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>>> set = map.entrySet();
for (Entry<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>> entry : set) {
String familyName = new String(entry.getKey());
NavigableMap<byte[], NavigableMap<Long, byte[]>> columnMap = entry.getValue();
Set<Map.Entry<byte[], NavigableMap<Long, byte[]>>> columnSet = columnMap.entrySet();
for (Entry<byte[], NavigableMap<Long, byte[]>> ent : columnSet) {
String columnName = new String(ent.getKey());
NavigableMap<Long, byte[]> valueMap = ent.getValue();
Set<Map.Entry<Long, byte[]>> valueSet = valueMap.entrySet();
for (Entry<Long, byte[]> e : valueSet) {
Long timeStamp = e.getKey();
String columnValue = http://www.mamicode.com/new String(e.getValue());
System.out.println(rowValue + tabCount+ "\tcolumn=" + familyName + ":"+ columnName + "\ttimestamp="
+ String.valueOf(timeStamp) + "\tvalue="http://www.mamicode.com/+ columnValue);
}
}
}
}
}
}
// 删除表中某一行
public static void deleteRow(String tableName, String row, String family,
Long timestamp) throws Exception {
HTable table = new HTable(config, tableName);
Delete delete = new Delete(Bytes.toBytes(row));
if (null == timestamp) {
table.delete(delete.deleteFamily(Bytes.toBytes(family)));
} else {
table.delete(delete.deleteFamily(Bytes.toBytes(family),timestamp.longValue()));
}
}
// 删除表中某一行的某个字段
public static void deleteColumn(String tableName, String row,
String family, String column, Long timestamp) throws Exception {
HTable table = new HTable(config, tableName);
Delete delete = new Delete(Bytes.toBytes(row));
if (null == timestamp) {
table.delete(delete.deleteColumn(Bytes.toBytes(family),Bytes.toBytes(column)));
} else {
table.delete(delete.deleteColumn(Bytes.toBytes(family),
Bytes.toBytes(column), timestamp.longValue()));
}
}
// 删除某个表
public static boolean deleteTable(String tableName) throws Exception {
HBaseAdmin admin = new HBaseAdmin(config);
if (admin.tableExists(tableName)) {
admin.disableTable(tableName);
admin.deleteTable(tableName);
return true;
}
return false;
}
public static void main(String[] args) throws Exception {
get("heroes", "1");
}
}
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