一、
几个主要 Hbase API 类和数据模型之间的对应关系:
1、 HBaseAdmin
关系: org.apache.hadoop.hbase.client.HBaseAdmin
作用:提供了一个接口来管理 HBase 数据库的表信息。它提供的方法包括:创建表,删 除表,列出表项,使表有效或无效,以及添加或删除表列族成员等。
2、 HBaseConfiguration
关系: org.apache.hadoop.hbase.HBaseConfiguration
作用:对 HBase 进行配置
3、 HTableDescriptor
关系: org.apache.hadoop.hbase.HTableDescriptor
作用:包含了表的名字极其对应表的列族
4、 HColumnDescriptor
关系: org.apache.hadoop.hbase.HColumnDescriptor
作用:维护着关于列族的信息,例如版本号,压缩设置等。它通常在创建表或者为表添 加列族的时候使用。列族被创建后不能直接修改,只能通过删除然后重新创建的方式。
列族被删除的时候,列族里面的数据也会同时被删除。
5、 HTable
关系: org.apache.hadoop.hbase.client.HTable
作用:可以用来和 HBase 表直接通信。此方法对于更新操作来说是非线程安全的。
6、 Put
关系: org.apache.hadoop.hbase.client.Put
作用:用来对单个行执行添加操作
7、 Get
关系: org.apache.hadoop.hbase.client.Get
作用:用来获取单个行的相关信息
8、 Result
关系: org.apache.hadoop.hbase.client.Result
作用:存储 Get 或者 Scan 操作后获取表的单行值。使用此类提供的方法可以直接获取值 或者各种 Map 结构( key-value 对)
二、具体增删改查 代码具体实现:
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package HbaseDome;
import java.util.List;
import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.Cell; 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.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.protobuf.generated.ZooKeeperProtos.Table; import org.apache.hadoop.hbase.util.Bytes;
public class Hbasedome implements HBaseDemoInterface{
static Configuration conf =null; private static final String ZKconnect="192.168.123.212:2181,192.168.123.213:2181,192.168.123.214:2181"; static{ conf=HBaseConfiguration.create(); conf.set("hbase.zookeeper.quorum", ZKconnect); } // static String tableName="student"; // static String[] family={"lie01","lie02"};
public static void main(String[] args) { Hbasedome a =new Hbasedome(); String tableName="student11"; String[] family={"lie01","lie02"}; try { HTableDescriptor htds =new HTableDescriptor(tableName); for(int z=0;z HColumnDescriptor h=new HColumnDescriptor(family[z]); htds.addFamily(h); } // a.descTable("table03"); // a.createTable(tableName, htds); // a.descTable("table03"); // a.getAllTables(); // a.createTable(tableName,family); // a.getResult("table03", "usr001"); // a.dropTable("user1"); // a.getAllTables(); // a.putData("table03", "usr005", "liezu01", "name", "liu"); // a.getResult("table03", "usr001"); // a.getResultScann("table03"); // a.getResultScann("table03","");
Result result = a.getResult("table03", "usr001"); System.out.println(result.toString()); List for (int i = 0; i < cells.size(); i++) { Cell cell = cells.get(i); System.out.println(cell.toString()); // printCell(cell); }
// List // for (int i = 0; i < list.size(); i++) { // KeyValue kv = list.get(i); // printKeyValye(kv); // } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }
} public static void printKeyValye(KeyValue kv) { System.out.println(Bytes.toString(kv.getRow()) + "\t" + Bytes.toString(kv.getFamily()) + "\t" + Bytes.toString(kv.getQualifier()) + "\t" + Bytes.toString(kv.getValue()) + "\t" + kv.getTimestamp()); } public static void printCell(Cell cell) { System.out.println(Bytes.toString(cell.getRow()) + "\t" + Bytes.toString(cell.getFamily()) + "\t" + Bytes.toString(cell.getQualifier()) + "\t" + Bytes.toString(cell.getValue()) + "\t" + cell.getTimestamp()); } //创建表 @Override public void createTable(String tableName, String[] family) throws Exception { HBaseAdmin admin=new HBaseAdmin(conf); HTableDescriptor desc =new HTableDescriptor(tableName);
for(int i=0;i desc.addFamily(new HColumnDescriptor(family[i])); System.out.println("11111111111"+family[i]); } if(admin.tableExists(tableName)){ System.out.println("表已经存在,别瞎输行吗"); // System.exit(0); }else{ admin.createTable(desc); System.out.println("表创建成功"); } }
//创建表 @Override public void createTable(String tableName, HTableDescriptor htds) throws Exception { HBaseAdmin admin=new HBaseAdmin(conf); boolean tableExists1 = admin.tableExists(Bytes.toBytes(tableName)); System.out.println(tableExists1 ? "表已存在" : "表不存在"); admin.createTable(htds); boolean tableExists = admin.tableExists(Bytes.toBytes(tableName)); System.out.println(tableExists ? "创建表成功" : "创建失败"); }
@Override public void descTable(String tableName) throws Exception { HBaseAdmin admin=new HBaseAdmin(conf); HTable table=new HTable(conf, tableName); HTableDescriptor desc =table.getTableDescriptor(); HColumnDescriptor[] columnFamilies = desc.getColumnFamilies();
for(HColumnDescriptor t:columnFamilies){ System.out.println(Bytes.toString(t.getName())); }
}
//// 这种方式是替换该表tableName的所有列簇 @Override public void modifyTable(String tableName) throws Exception { HBaseAdmin admin=new HBaseAdmin(conf); HTableDescriptor htd = new HTableDescriptor(TableName.valueOf(tableName)); htd.addFamily(new HColumnDescriptor(Bytes.toBytes("cf3"))); htd.addFamily(new HColumnDescriptor(Bytes.toBytes("cf2"))); admin.modifyTable(tableName, htd);
// 删除该表tableName当中的特定的列簇 // admin.deleteColumn(tableName, "cf3");
System.out.println("修改成功");
}
@Override public void getAllTables() throws Exception { HBaseAdmin admin =new HBaseAdmin(conf);
String[] tableNames = admin.getTableNames(); for(int i=0;i System.out.println(tableNames[i]); } }
//更新数据 插入数据 @Override public void putData(String tableName, String rowKey, String familyName, String columnName, String value) throws Exception { HTable htable=new HTable(conf, Bytes.toBytes(tableName)); Put put=new Put(Bytes.toBytes(rowKey)); put.add(Bytes.toBytes(familyName), Bytes.toBytes(columnName), Bytes.toBytes(value)); htable.put(put);
}
//为表添加数据 @Override public void addData(String tableName, String rowKey, String[] column1, String[] value1, String[] column2, String[] value2) throws Exception {
Put put=new Put(Bytes.toBytes(rowKey)); HTable htable=new HTable(conf, Bytes.toBytes(tableName)); HColumnDescriptor[] columnFamilies = htable.getTableDescriptor().getColumnFamilies(); for(int i=0;i<=columnFamilies.length;i++){ String nameAsString = columnFamilies[i].getNameAsString(); if(nameAsString.equals("lie01")){ for(int j=0;j put.add(Bytes.toBytes(nameAsString), Bytes.toBytes(column1[j]),Bytes.toBytes(value1[j])); } } if(nameAsString.equals("lie02")){ for(int j=0;j put.add(Bytes.toBytes(nameAsString), Bytes.toBytes(column2[j]),Bytes.toBytes(value2[j])); } }
} htable.put(put); System.out.println("addData ok!"); }
//根据rowkey 查询 @Override public Result getResult(String tableName, String rowKey) throws Exception { Get get=new Get(Bytes.toBytes(rowKey)); HTable htable=new HTable(conf, Bytes.toBytes(tableName)); Result result=htable.get(get); // for(KeyValue k:result.list()){ // System.out.println(Bytes.toString(k.getFamily())); // System.out.println(Bytes.toString(k.getQualifier())); // System.out.println(Bytes.toString(k.getValue())); // System.out.println(k.getTimestamp()); // } return result; }
//查询指定的某列 @Override public Result getResult(String tableName, String rowKey, String familyName, String columnName) throws Exception { Get get=new Get(Bytes.toBytes(rowKey)); HTable htable=new HTable(conf, Bytes.toBytes(tableName)); get.addColumn(Bytes.toBytes(familyName),Bytes.toBytes(columnName)); Result result=htable.get(get); for(KeyValue k:result.list()){ System.out.println(Bytes.toString(k.getFamily())); System.out.println(Bytes.toString(k.getQualifier())); System.out.println(Bytes.toString(k.getValue())); System.out.println(k.getTimestamp()); } return result; }
//遍历查询表 @Override public ResultScanner getResultScann(String tableName) throws Exception {
Scan scan=new Scan(); ResultScanner rs =null; HTable htable=new HTable(conf, tableName); try{ rs=htable.getScanner(scan); for(Result r: rs){ for(KeyValue kv:r.list()){
System.out.println(Bytes.toString(kv.getRow())); System.out.println(Bytes.toString(kv.getFamily())); System.out.println(Bytes.toString(kv.getQualifier())); System.out.println(Bytes.toString(kv.getValue())); System.out.println(kv.getTimestamp()); } } }finally{ rs.close(); } return rs; }
@Override public ResultScanner getResultScann(String tableName, Scan scan) throws Exception {
ResultScanner rs =null; HTable htable=new HTable(conf, tableName); try{ rs=htable.getScanner(scan); for(Result r: rs){ for(KeyValue kv:r.list()){
System.out.println(Bytes.toString(kv.getRow())); System.out.println(Bytes.toString(kv.getFamily())); System.out.println(Bytes.toString(kv.getQualifier())); System.out.println(Bytes.toString(kv.getValue())); System.out.println(kv.getTimestamp()); } } }finally{ rs.close(); } return rs; }
//查询表中的某一列 @Override public Result getResultByColumn(String tableName, String rowKey, String familyName, String columnName) throws Exception {
HTable htable=new HTable(conf, tableName); Get get=new Get(Bytes.toBytes(rowKey)); get.addColumn(Bytes.toBytes(familyName),Bytes.toBytes(columnName)); Result result=htable.get(get); for(KeyValue kv: result.list()){
System.out.println(Bytes.toString(kv.getFamily())); System.out.println(Bytes.toString(kv.getQualifier())); System.out.println(Bytes.toString(kv.getValue())); System.out.println(kv.getTimestamp());
} return result; }
//查询某列数据的某个版本 @Override public Result getResultByVersion(String tableName, String rowKey, String familyName, String columnName, int versions) throws Exception {
HTable htable=new HTable(conf, tableName); Get get =new Get(Bytes.toBytes(rowKey)); get.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName)); get.setMaxVersions(versions); Result result=htable.get(get);
for(KeyValue kv: result.list()){
System.out.println(Bytes.toString(kv.getFamily())); System.out.println(Bytes.toString(kv.getQualifier())); System.out.println(Bytes.toString(kv.getValue())); System.out.println(kv.getTimestamp());
}
return result; }
//删除指定某列 @Override public void deleteColumn(String tableName, String rowKey, String falilyName, String columnName) throws Exception {
HTable htable=new HTable(conf, tableName); // Delete delete1=new Delete(Bytes.toBytes(rowKey)); Delete de =new Delete(Bytes.toBytes(rowKey)); de.deleteColumn(Bytes.toBytes(falilyName), Bytes.toBytes(columnName)); htable.delete(de); }
//删除指定的某个rowkey @Override public void deleteColumn(String tableName, String rowKey) throws Exception { HTable htable=new HTable(conf, tableName);
Delete de =new Delete(Bytes.toBytes(rowKey)); htable.delete(de);
}
//让该表失效 @Override public void disableTable(String tableName) throws Exception { HBaseAdmin admin=new HBaseAdmin(conf); admin.disableTable(tableName);
}
//删除表 @Override public void dropTable(String tableName) throws Exception {
HBaseAdmin admin=new HBaseAdmin(conf); admin.disableTable(tableName); admin.deleteTable(tableName);
}
} |
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package com.ghgj.hbase.test1610;
import java.io.IOException; import java.util.ArrayList; import java.util.Iterator; import java.util.List;
import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.Cell; 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.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 HBaseAPIDemo1610 implements HBaseDemoInterface {
private static final String ROWKEY = "p001"; private static final String ROWKEY2 = "p002"; private static final String FAMILY1 = "cf1"; private static final String FAMILY2 = "cf2"; private static final String KEY = "name"; private static final String VALUE = "huangbo";
private static final String TABLE_NAME = "person"; private static final String[] COLUMN_FAMILY = new String[] { FAMILY1, FAMILY2 };
static Configuration conf = null; static HBaseAdmin admin = null; static HTable table = null;
static { try { conf = HBaseConfiguration.create(); conf.set("hbase.zookeeper.quorum", "hadoop03:2181,hadoop04:2181,hadoop05:2181"); admin = new HBaseAdmin(conf); table = new HTable(conf, TABLE_NAME);
} catch (IOException e) { // e.printStackTrace(); System.out.println("报错"); } }
public static void main(String[] args) throws Exception { HBaseAPIDemo1610 hbase = new HBaseAPIDemo1610();
// 测试创建表 hbase.createTable(TABLE_NAME, COLUMN_FAMILY);
// 测试创建表 HTableDescriptor htd = new HTableDescriptor(TableName.valueOf(TABLE_NAME)); for (int i = 0; i < COLUMN_FAMILY.length; i++) { HColumnDescriptor cf1 = new HColumnDescriptor(COLUMN_FAMILY[i]); htd.addFamily(cf1); } hbase.createTable(TABLE_NAME, htd);
// 查看表属性 hbase.descTable(TABLE_NAME);
// 查询所有的表 hbase.getAllTables();
// 测试修改表 hbase.modifyTable(TABLE_NAME);
// 插入数据 hbase.putData(TABLE_NAME, ROWKEY, FAMILY1, KEY, VALUE);
// 测试插入一堆数据 String[] column1 = new String[] { "name1", "age", "province" }; String[] value1 = new String[] { "huangbo", "33", "xinjiang" }; String[] column2 = new String[] { "gender" }; String[] value2 = new String[] { "male" }; hbase.addData(TABLE_NAME, ROWKEY2, column1, value1, column2, value2);
// 通过rowkey查询数据 Result result = hbase.getResult(TABLE_NAME, ROWKEY2); System.out.println(result.toString()); List for (int i = 0; i < list.size(); i++) { KeyValue kv = list.get(i); printKeyValye(kv); }
// 通过rowkey, family, province查询数据 Result result1 = hbase.getResult(TABLE_NAME, ROWKEY2, FAMILY1, "province"); List for (int i = 0; i < cells.size(); i++) { Cell cell = cells.get(i); printCell(cell); }
// 扫描全表数据 ResultScanner resultScann = hbase.getResultScann(TABLE_NAME); printResultScanner(resultScann);
/*Iterator while(iterator.hasNext()){ Result next = iterator.next(); }*/
// 通过scan扫描全表数据,scan中可以加入一些过滤条件 Scan scan = new Scan(); scan.setStartRow(Bytes.toBytes("user")); scan.setStopRow(Bytes.toBytes("zk002")); scan.setTimeRange(1488252774189l, 1488252774191l); ResultScanner resultScann1 = hbase.getResultScann(TABLE_NAME, scan); printResultScanner(resultScann1);
// 两种方式查询最大版本数的hbase数据 Result resultByVersion = hbase.getResultByVersion(TABLE_NAME, ROWKEY, FAMILY1, "name", 3); printResult(resultByVersion); System.out.println("-------------------"); ResultScanner rs = hbase.getResultByVersion(ROWKEY, FAMILY1, "name", 3); printResultScanner(rs);
// 删除表 hbase.dropTable(TABLE_NAME); }
public static void printResultScanner(ResultScanner resultScann) { for (Result result : resultScann) { printResult(result); } }
public static void printResult(Result result) { List for (int i = 0; i < cells.size(); i++) { Cell cell = cells.get(i); printCell(cell); } }
public static void printCell(Cell cell) { System.out.println(Bytes.toString(cell.getRow()) + "\t" + Bytes.toString(cell.getFamily()) + "\t" + Bytes.toString(cell.getQualifier()) + "\t" + Bytes.toString(cell.getValue()) + "\t" + cell.getTimestamp()); }
public static void printKeyValye(KeyValue kv) { System.out.println(Bytes.toString(kv.getRow()) + "\t" + Bytes.toString(kv.getFamily()) + "\t" + Bytes.toString(kv.getQualifier()) + "\t" + Bytes.toString(kv.getValue()) + "\t" + kv.getTimestamp()); }
// create 'tablename','cf1','cf2' @Override public void createTable(String tableName, String[] family) throws Exception { HTableDescriptor htd = new HTableDescriptor(TableName.valueOf(tableName)); for (int i = 0; i < family.length; i++) { HColumnDescriptor cf1 = new HColumnDescriptor(family[i]); htd.addFamily(cf1); } admin.createTable(htd); boolean tableExists = admin.tableExists(Bytes.toBytes(tableName)); System.out.println(tableExists ? "创建表成功" : "创建失败"); }
@Override public void createTable(String tableName, HTableDescriptor htd) throws Exception { admin.createTable(htd); boolean tableExists = admin.tableExists(Bytes.toBytes(tableName)); System.out.println(tableExists ? "创建表成功" : "创建失败"); }
// desc 'person' @Override public void descTable(String tableName) throws Exception { HTableDescriptor tableDescriptor = table.getTableDescriptor(); HColumnDescriptor[] columnFamilies = tableDescriptor.getColumnFamilies(); for (HColumnDescriptor hcd : columnFamilies) { // System.out.println(hcd.toString()+"\t"); System.out.println(Bytes.toString(hcd.getName())); } }
@Override public void modifyTable(String tableName) throws Exception { // 这种方式是替换该表tableName的所有列簇 HTableDescriptor htd = new HTableDescriptor(TableName.valueOf(tableName)); htd.addFamily(new HColumnDescriptor(Bytes.toBytes("cf3"))); htd.addFamily(new HColumnDescriptor(Bytes.toBytes("cf2"))); admin.modifyTable(tableName, htd);
// 删除该表tableName当中的特定的列簇 // admin.deleteColumn(tableName, "cf3");
System.out.println("修改成功"); }
// list @Override public void getAllTables() throws Exception { TableName[] listTableNames = admin.listTableNames(); for (TableName tn : listTableNames) { System.out.println(tn.toString()); } }
// put 'tablename','rowkey','familyname:key','value' @Override public void putData(String tableName, String rowKey, String familyName, String columnName, String value) throws Exception { // HTable table = new HTable(conf, tableName); Put put = new Put(Bytes.toBytes(rowKey)); put.add(Bytes.toBytes(familyName), Bytes.toBytes(columnName), Bytes.toBytes(value)); table.put(put); System.out.println("插入成功"); }
/** * @param tableName * 表名 * @param rowKey * rowkey * @param column1 * 第一个列簇的key数组 * @param value1 * 第一个列簇的value数组,key数组和value数组长度必须一样 * @param column2 * 第二列簇的key数组 * @param value2 * 第二个列簇的values数组, 同上同理 * @throws Exception */ @Override public void addData(String tableName, String rowKey, String[] column1, String[] value1, String[] column2, String[] value2) throws Exception { List
for (int i = 0; i < column1.length; i++) { Put put = new Put(Bytes.toBytes(rowKey)); put.add(Bytes.toBytes(FAMILY1), Bytes.toBytes(column1[i]), Bytes.toBytes(value1[i])); puts.add(put); }
for (int i = 0; i < column2.length; i++) { Put put = new Put(Bytes.toBytes(rowKey)); put.add(Bytes.toBytes(FAMILY2), Bytes.toBytes(column2[i]), Bytes.toBytes(value2[i])); puts.add(put); }
table.put(puts); System.out.println("插入一堆数据成功"); }
// get 'tablename','rowkey' @Override public Result getResult(String tableName, String rowKey) throws Exception { Get get = new Get(Bytes.toBytes(rowKey)); Result result = table.get(get); return result; }
@Override public Result getResult(String tableName, String rowKey, String familyName, String columnName) throws Exception { Get get = new Get(Bytes.toBytes(rowKey)); get.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName)); Result result = table.get(get); return result; }
@Override public ResultScanner getResultScann(String tableName) throws Exception { Scan scan = new Scan(); ResultScanner scanner = table.getScanner(scan); // ResultScanner scanner = table.getScanner(Bytes.toBytes(FAMILY2)); // ResultScanner scanner = table.getScanner(Bytes.toBytes(FAMILY1), // Bytes.toBytes("name1")); return scanner; }
@Override public ResultScanner getResultScann(String tableName, Scan scan) throws Exception { return table.getScanner(scan); }
@Override public Result getResultByColumn(String tableName, String rowKey, String familyName, String columnName) throws Exception { return null; }
// get 'person','p001',{COLUMNS => 'cf1:name', VERSIONS => 3} @Override public Result getResultByVersion(String tableName, String rowKey, String familyName, String columnName, int versions) throws Exception { Get get = new Get(Bytes.toBytes(rowKey)); get.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName)); get.setMaxVersions(versions); Result result = table.get(get); return result; }
public ResultScanner getResultByVersion(String rowKey, String familyName, String columnName, int versions) throws Exception { Scan scan = new Scan(Bytes.toBytes(rowKey), Bytes.toBytes(rowKey)); scan.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName)); scan.setMaxVersions(versions); ResultScanner scanner = table.getScanner(scan); return scanner; }
@Override public void deleteColumn(String tableName, String rowKey, String falilyName, String columnName) throws Exception {
}
@Override public void deleteColumn(String tableName, String rowKey) throws Exception {
}
@Override public void disableTable(String tableName) throws Exception { admin.disableTable(tableName); }
@Override public void dropTable(String tableName) throws Exception { try { admin.deleteTable(tableName); } catch (Exception e) { // e.printStackTrace(); disableTable(tableName); admin.deleteTable(tableName); System.out.println("ssssssss"); } finally { boolean tableExists = admin.tableExists(Bytes.toBytes(tableName)); System.out.println(tableExists ? "删除失败" : "删除成功"); } } } |