hbase基础java操作
package util;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellScanner;
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.NamespaceDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.TableNotFoundException;
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.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;
public class DBUtil {
public static Configuration configuration;
public static Connection connection;
public static Admin admin;
//**********连接操作**********
//建立链接
public static void getConnection() {
configuration = HBaseConfiguration.create();
configuration.set("hbase.rootdir", "hdfs://localhost:9000/hbase");
try {
connection = ConnectionFactory.createConnection(configuration);
admin = connection.getAdmin();
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
//关闭链接
public static void close() {
try {
if(admin!=null) {
admin.close();
}
if(null!=connection) {
connection.close();
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
//**********命名空间操作**********
//创建namespace
public static void createNamespace(String namespace) throws IOException {
getConnection();
NamespaceDescriptor nDescriptor = NamespaceDescriptor.create(namespace).build();
admin.createNamespace(nDescriptor);
close();
}
//查询所有的namespace
public static ArrayList<String> listNamespace() throws IOException {
getConnection();
NamespaceDescriptor[] namespaceDescriptors = admin.listNamespaceDescriptors();
ArrayList<String> list = new ArrayList<>();
for(NamespaceDescriptor nd:namespaceDescriptors) {
System.out.println(nd.getName());
list.add(nd.getName());
}
close();
return list;
}
//获取指定namespace中所有的表名
public static ArrayList<String> listTables(String namespace) throws IOException {
getConnection();
HTableDescriptor[] tables = admin.listTableDescriptorsByNamespace(namespace);
ArrayList<String> list = new ArrayList<>();
for(HTableDescriptor table:tables) {
// System.out.println(table.getNameAsString());
list.add(table.getTableName().getNameAsString());
}
close();
return list;
}
//删除namespace
public static boolean dropNamespace(String namespace) {
getConnection();
try {
admin.deleteNamespace(namespace);
close();
return true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
close();
return false;
}
}
//**********表操作**********
//创建表
public static void createTable(String tablename,String[] colFamily) throws IOException {
getConnection();
TableName tName = TableName.valueOf(tablename);
if(admin.tableExists(tName)) {
System.out.println("table exists");
}else {
HTableDescriptor hTableDescriptor = new HTableDescriptor(tName);
for(String str:colFamily) {
HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(str);
hTableDescriptor.addFamily(hColumnDescriptor);
}
admin.createTable(hTableDescriptor);
}
close();
}
//获取所有列族
public static ArrayList<String> listColFamilies(String tablename) throws TableNotFoundException, IOException{
getConnection();
HTableDescriptor tableDescriptor = admin.getTableDescriptor(TableName.valueOf(tablename));
HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();
ArrayList<String> list = new ArrayList<>();
for(HColumnDescriptor hcd:columnDescriptors) {
System.out.println(hcd.getNameAsString());
list.add(hcd.getNameAsString());
}
return list;
}
//删除列族
public static boolean deleteColFamily(String tablename,String colname) {
getConnection();
try {
admin.deleteColumn(TableName.valueOf(tablename), Bytes.toBytes(colname));
close();
return true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
close();
return false;
}
}
//删除表
@SuppressWarnings("finally")
public static boolean dropTable(String tablename) {
getConnection();
try {
HTableDescriptor descriptor = admin.getTableDescriptor(TableName.valueOf(tablename));
if(admin.tableExists(TableName.valueOf(tablename))) {
if(admin.isTableEnabled(TableName.valueOf(tablename))) {
admin.disableTable(TableName.valueOf(tablename));
}
admin.deleteTable(TableName.valueOf(tablename));
}
close();
return true;
} catch (TableNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
close();
return false;
}
}
//添加数据(表名，行健，列族，列名，值)/如果存在则修改
public static boolean insertData(String tablename,String rowkey,String colFamily,String col,String val){
getConnection();
Table table;
try {
table = connection.getTable(TableName.valueOf(tablename));
Put put = new Put(Bytes.toBytes(rowkey));
put.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(col), Bytes.toBytes(val));
table.put(put);
table.close();
close();
return true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
close();
return false;
}
}
//删除数据(表名，行健)
public static boolean deleteData(String tablename,String rowkey){
getConnection();
Table table;
try {
table = connection.getTable(TableName.valueOf(tablename));
Delete delete = new Delete(Bytes.toBytes(rowkey));
table.delete(delete);
table.close();
close();
return true;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
close();
return false;
}
}
//浏览数据
public static void getData(String tablename,String rowkey,String colFamily,String col) throws IOException {
getConnection();
Table table = connection.getTable(TableName.valueOf(tablename));
Get get = new Get(Bytes.toBytes(rowkey));
get.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(col));
Result result = table.get(get);
System.out.println(new String(result.getValue(colFamily.getBytes(), col==null?null:col.getBytes())));
table.close();
close();
}
//扫描数据
public static Iterator<Result> scan(String tablename) {
getConnection();
try {
Table table = connection.getTable(TableName.valueOf(tablename));
Scan scan = new Scan();
// scan.setStartRow(Bytes.toBytes(startRow));
// scan.setStopRow(Bytes.toBytes(endrow));
ResultScanner scanner = table.getScanner(scan);
Iterator<Result> iterator = scanner.iterator();
return iterator;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
//**********显示内容**********
//显示scan
public static Iterator<Result> showScan(Table table,Scan scan) {
ResultScanner scanner;
try {
scanner = table.getScanner(scan);
Iterator<Result> iterator = scanner.iterator();
return iterator;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
//显示result
public static void showResult(Result result) {
CellScanner cellScanner = result.cellScanner();
try {
while(cellScanner.advance()) {
Cell cell = cellScanner.current();
String rowkey = new String(CellUtil.cloneRow(cell));
String colFamily = new String(CellUtil.cloneFamily(cell));
String qualifier = new String(CellUtil.cloneQualifier(cell));
String value = new String(CellUtil.cloneValue(cell));
System.out.println(rowkey+":"+colFamily+"."+qualifier+"="+value);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//迭代器result
public static void showIterResult(Iterator<Result> iterator) {
while(iterator.hasNext()) {
Result result = iterator.next();
showResult(result);
}
}
//**********过滤器**********
//创建单列值过滤器
public static SingleColumnValueFilter singleColumnValueFilter(String family,String qualifier,CompareFilter.CompareOp compareOp,String value,boolean isNull) {
SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes(family), Bytes.toBytes(qualifier), compareOp, Bytes.toBytes(value));
filter.setFilterIfMissing(isNull);
return filter;
}
//过滤器链
public static Iterator<Result> filterList(String tablename,String type,SingleColumnValueFilter[] lists) {
FilterList filterList = null;
if(type.equals("and")) {
filterList = new FilterList(FilterList.Operator.MUST_PASS_ALL);
}else if(type.equals("or")){
filterList = new FilterList(FilterList.Operator.MUST_PASS_ONE);
}
for(SingleColumnValueFilter filter:lists) {
filterList.addFilter(filter);
}
Scan scan = new Scan();
scan.setFilter(filterList);
getConnection();
try {
Table table = connection.getTable(TableName.valueOf(tablename));
return showScan(table, scan);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
public static void main(String[] args) throws IOException {
String[] colFamily = new String[] {"score","age"};
String tablename = "people";
createTable(tablename,colFamily);
insertData(tablename, "001", "score", "english", "60");
insertData(tablename, "001", "score", "math", "90");
insertData(tablename, "001", "age", "now", "20");
insertData(tablename, "001", "age", "last", "19");
getData(tablename, "001", "score", "english");
insertData(tablename, "001", "score", "english", "90");
getData(tablename, "001", "score", "english");
deleteData(tablename, "001", "score", "english");
createNamespace("zdm");
dropNamespace("ns3");
listNamespace();
listTables("default");
deleteColFamily("people", "age");
listColFamilies("people");
dropTable("people");
listTables("default");
SingleColumnValueFilter s1 = singleColumnValueFilter("score", "math",CompareFilter.CompareOp.GREATER , "20", true);
SingleColumnValueFilter s2 = singleColumnValueFilter("age", "",CompareFilter.CompareOp.EQUAL , "70", true);
SingleColumnValueFilter[] filters = new SingleColumnValueFilter[] {s1,s2};
showIterResult(filterList("people", "and", filters));
}
}
package util;
import java.io.IOException;import java.util.ArrayList;import java.util.Iterator;
import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.hbase.Cell;import org.apache.hadoop.hbase.CellScanner;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.NamespaceDescriptor;import org.apache.hadoop.hbase.TableName;import org.apache.hadoop.hbase.TableNotFoundException;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.filter.CompareFilter;import org.apache.hadoop.hbase.filter.FilterList;import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;import org.apache.hadoop.hbase.util.Bytes;
public class DBUtil {public static Configuration configuration;public static Connection connection;public static Admin admin;//**********连接操作**********//建立链接public static void getConnection() {configuration = HBaseConfiguration.create();configuration.set("hbase.rootdir", "hdfs://localhost:9000/hbase");try {connection = ConnectionFactory.createConnection(configuration);admin = connection.getAdmin();}catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}//关闭链接public static void close() {try {if(admin!=null) {admin.close();}if(null!=connection) {connection.close();}} catch (Exception e) {// TODO: handle exceptione.printStackTrace();}}
//**********命名空间操作**********//创建namespacepublic static void createNamespace(String namespace) throws IOException {getConnection();NamespaceDescriptor nDescriptor = NamespaceDescriptor.create(namespace).build();admin.createNamespace(nDescriptor);close();}//查询所有的namespacepublic static ArrayList<String> listNamespace() throws IOException {getConnection();NamespaceDescriptor[] namespaceDescriptors = admin.listNamespaceDescriptors();ArrayList<String> list = new ArrayList<>();for(NamespaceDescriptor nd:namespaceDescriptors) {System.out.println(nd.getName());list.add(nd.getName());}close();return list;}//获取指定namespace中所有的表名public static ArrayList<String> listTables(String namespace) throws IOException {getConnection();HTableDescriptor[] tables = admin.listTableDescriptorsByNamespace(namespace);ArrayList<String> list = new ArrayList<>();for(HTableDescriptor table:tables) {//System.out.println(table.getNameAsString());list.add(table.getTableName().getNameAsString());}close();return list;}//删除namespacepublic static boolean dropNamespace(String namespace) {getConnection();try {admin.deleteNamespace(namespace);close();return true;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();close();return false;}}//**********表操作**********//创建表public static void createTable(String tablename,String[] colFamily) throws IOException {getConnection();TableName tName = TableName.valueOf(tablename);if(admin.tableExists(tName)) {System.out.println("table exists");}else {HTableDescriptor hTableDescriptor = new HTableDescriptor(tName);for(String str:colFamily) {HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(str);hTableDescriptor.addFamily(hColumnDescriptor);}admin.createTable(hTableDescriptor);}close();}//获取所有列族public static ArrayList<String> listColFamilies(String tablename) throws TableNotFoundException, IOException{getConnection();HTableDescriptor tableDescriptor = admin.getTableDescriptor(TableName.valueOf(tablename));HColumnDescriptor[] columnDescriptors = tableDescriptor.getColumnFamilies();ArrayList<String> list = new ArrayList<>();for(HColumnDescriptor hcd:columnDescriptors) {System.out.println(hcd.getNameAsString());list.add(hcd.getNameAsString());}return list;}//删除列族public static boolean deleteColFamily(String tablename,String colname) {getConnection();try {admin.deleteColumn(TableName.valueOf(tablename), Bytes.toBytes(colname));close();return true;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();close();return false;}}//删除表@SuppressWarnings("finally")public static boolean dropTable(String tablename) {getConnection();try {HTableDescriptor descriptor = admin.getTableDescriptor(TableName.valueOf(tablename));if(admin.tableExists(TableName.valueOf(tablename))) {if(admin.isTableEnabled(TableName.valueOf(tablename))) {admin.disableTable(TableName.valueOf(tablename));}admin.deleteTable(TableName.valueOf(tablename));}close();return true;} catch (TableNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally {close();return false;}}//添加数据(表名，行健，列族，列名，值)/如果存在则修改public static boolean insertData(String tablename,String rowkey,String colFamily,String col,String val){getConnection();Table table;try {table = connection.getTable(TableName.valueOf(tablename));Put put = new Put(Bytes.toBytes(rowkey));put.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(col), Bytes.toBytes(val));table.put(put);table.close();close();return true;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();close();return false;}}//删除数据(表名，行健)public static boolean deleteData(String tablename,String rowkey){getConnection();Table table;try {table = connection.getTable(TableName.valueOf(tablename));Delete delete = new Delete(Bytes.toBytes(rowkey));table.delete(delete);table.close();close();return true;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();close();return false;}}//浏览数据public static void getData(String tablename,String rowkey,String colFamily,String col) throws IOException {getConnection();Table table = connection.getTable(TableName.valueOf(tablename));Get get = new Get(Bytes.toBytes(rowkey));get.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(col));Result result = table.get(get);System.out.println(new String(result.getValue(colFamily.getBytes(), col==null?null:col.getBytes())));table.close();close();}//扫描数据public static Iterator<Result> scan(String tablename) {getConnection();try {Table table = connection.getTable(TableName.valueOf(tablename));Scan scan = new Scan();//scan.setStartRow(Bytes.toBytes(startRow));//scan.setStopRow(Bytes.toBytes(endrow));ResultScanner scanner = table.getScanner(scan);Iterator<Result> iterator = scanner.iterator();return iterator;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();return null;}}//**********显示内容**********//显示scanpublic static Iterator<Result> showScan(Table table,Scan scan) {ResultScanner scanner;try {scanner = table.getScanner(scan);Iterator<Result> iterator = scanner.iterator();return iterator;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();return null;}}//显示resultpublic static void showResult(Result result) {CellScanner cellScanner = result.cellScanner();try {while(cellScanner.advance()) {Cell cell = cellScanner.current();String rowkey = new String(CellUtil.cloneRow(cell));String colFamily = new String(CellUtil.cloneFamily(cell));String qualifier = new String(CellUtil.cloneQualifier(cell));String value = new String(CellUtil.cloneValue(cell));System.out.println(rowkey+":"+colFamily+"."+qualifier+"="+value);}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}//迭代器resultpublic static void showIterResult(Iterator<Result> iterator) {while(iterator.hasNext()) {Result result = iterator.next();showResult(result);}}//**********过滤器**********//创建单列值过滤器public static SingleColumnValueFilter singleColumnValueFilter(String family,String qualifier,CompareFilter.CompareOp compareOp,String value,boolean isNull) {SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes(family), Bytes.toBytes(qualifier), compareOp, Bytes.toBytes(value));filter.setFilterIfMissing(isNull);return filter;}//过滤器链public static Iterator<Result> filterList(String tablename,String type,SingleColumnValueFilter[] lists) {FilterList filterList = null;if(type.equals("and")) {filterList = new FilterList(FilterList.Operator.MUST_PASS_ALL);}else if(type.equals("or")){filterList = new FilterList(FilterList.Operator.MUST_PASS_ONE);}for(SingleColumnValueFilter filter:lists) {filterList.addFilter(filter);}Scan scan = new Scan();scan.setFilter(filterList);getConnection();try {Table table = connection.getTable(TableName.valueOf(tablename));return showScan(table, scan);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();return null;}}public static void main(String[] args) throws IOException {//String[] colFamily = new String[] {"score","age"};//String tablename = "people";//createTable(tablename,colFamily);//insertData(tablename, "001", "score", "english", "60");//insertData(tablename, "001", "score", "math", "90");//insertData(tablename, "001", "age", "now", "20");//insertData(tablename, "001", "age", "last", "19");//getData(tablename, "001", "score", "english");//insertData(tablename, "001", "score", "english", "90");//getData(tablename, "001", "score", "english");//deleteData(tablename, "001", "score", "english");//createNamespace("zdm");//dropNamespace("ns3");//listNamespace();//listTables("default");//deleteColFamily("people", "age");//listColFamilies("people");//dropTable("people");//listTables("default");SingleColumnValueFilter s1 = singleColumnValueFilter("score", "math",CompareFilter.CompareOp.GREATER , "20", true);SingleColumnValueFilter s2 = singleColumnValueFilter("age", "",CompareFilter.CompareOp.EQUAL , "70", true);SingleColumnValueFilter[] filters = new SingleColumnValueFilter[] {s1,s2};showIterResult(filterList("people", "and", filters));}}
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