HBase JDBC连接
JDBC连接HBase
1.pom.xml中的依赖
junit
junit
3.8.1
test
org.apache.hbase
hbase-client
1.1.3
guava
com.google.guava
com.google.guava
guava
15.0
Java代码
package cn.com.tengen.hbase;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.Set;
import org.apache.commons.io.IOUtils;
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.TableName;
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.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;
/**
* JDBC 连接 Hbase测试
*
* @author lucky
*
*/
public class HBaseJDBCTest {
/**
* 列族
*/
private static final String FAMILY_NAMES = "a,b,c,d,e,f";
/**
* 表名
*/
private static final String TABLE_NAME = "bigTab";
/**
* 连接对象
*/
private static Connection conn;
/**
* Hbase集群地址，多个地址用“,”分开
*/
private static final String HOSTS = "quickstart.cloudera";
static {
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", HOSTS);
try {
conn = ConnectionFactory.createConnection(conf);
createTable(TABLE_NAME, FAMILY_NAMES);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 创建表
*
* @param tableName
* 表名
* @param familyNames
* 列族，多个列族用“,”分开
* @throws IOException
*/
private static void createTable(String tableName, String familyNames) throws IOException {
Admin admin = null;
TableName tn = TableName.valueOf(tableName);
admin = conn.getAdmin();
if (!admin.tableExists(tn)) {
HTableDescriptor descriptor = new HTableDescriptor(tn);
for (String familyName : familyNames.split(",")) {
descriptor.addFamily(new HColumnDescriptor(familyName));
}
admin.createTable(descriptor);
System.out.println("创建表：" + tableName);
}
}
/**
* 删除表
*
* @param tableName
* 表名
* @throws IOException
*/
private static void dropTable(String tableName) throws IOException {
Admin admin = null;
try {
TableName tn = TableName.valueOf(tableName);
admin = conn.getAdmin();
if (admin.tableExists(tn)) {
admin.disableTable(tn);
admin.deleteTable(tn);
System.out.println("删除表：" + tableName);
}
} finally {
IOUtils.closeQuietly(admin);
}
}
/**
* 添加数据
*
* @param tableName
* 表名
* @param rowKey
* 行号
* @param datas
* 数据
* @throws IOException
*/
private static void add(String tableName, String rowKey, List datas) throws IOException {
Table table = conn.getTable(TableName.valueOf(tableName));
try {
Put list = new Put(rowKey.getBytes());
for (String[] data : datas) {
list.addColumn(data[0].getBytes(), data[1].getBytes(), data[2].getBytes());
}
table.put(list);
} finally {
if (table != null) {
IOUtils.closeQuietly(table);
}
}
}
/**
* 查看所有数据
*
* @param tableName
* @throws IOException
*/
private static void scan(String tableName) throws IOException {
Table table = conn.getTable(TableName.valueOf(tableName));
try {
ResultScanner rs = table.getScanner(new Scan());
for (Result r : rs) {
NavigableMap>> map = r.getMap();
Set>>> set = map.entrySet();
for (Entry>> entry : set) {
Set>> entrySet = entry.getValue().entrySet();
for (Entry> entry2 : entrySet) {
System.out.print(new String(r.getRow()));
System.out.print("t");
System.out.print(new String(entry.getKey()));
System.out.print(":");
System.out.print(new String(entry2.getKey()));
System.out.print(" => ");
System.out.println(new String(entry2.getValue().firstEntry().getValue()));
}
}
}
} finally {
if (table != null) {
IOUtils.closeQuietly(table);
}
}
}
/**
* 根据rowKey查询
*
* @param tableName
* @param rowKey
* @throws IOException
*/
private static void scanByrowKey(String tableName, String rowKey) throws IOException {
Table table = conn.getTable(TableName.valueOf(tableName));
try {
Result r = table.get(new Get(rowKey.getBytes()));
NavigableMap>> map = r.getMap();
Set>>> set = map.entrySet();
for (Entry>> entry : set) {
Set>> entrySet = entry.getValue().entrySet();
for (Entry> entry2 : entrySet) {
System.out.print(new String(r.getRow()));
System.out.print("t");
System.out.print(new String(entry.getKey()));
System.out.print(":");
System.out.print(new String(entry2.getKey()));
System.out.print(" => ");
System.out.println(new String(entry2.getValue().firstEntry().getValue()));
}
}
} finally {
if (table != null) {
IOUtils.closeQuietly(table);
}
}
}
public static void main(String[] args) throws IOException {
List list = new ArrayList();
list.add("a, a1, www1".split(","));
list.add("a, a2, www2".split(","));
list.add("a, a3, www3".split(","));
list.add("a, a4, www4".split(","));
list.add("b, a1, www5".split(","));
list.add("b, a2, www6".split(","));
list.add("b, a3, www7".split(","));
list.add("b, a4, www8".split(","));
list.add("c, a5, www9".split(","));
list.add("c, a6, www10".split(","));
list.add("c, a1, www11".split(","));
list.add("c, a2, www12".split(","));
list.add("d, a3, www13".split(","));
list.add("e, a4, www14".split(","));
list.add("f, a5, www15".split(","));
add(TABLE_NAME, "100001", list);
list = new ArrayList();
list.add("a, a1, vvv1".split(","));
list.add("a, a2, vvv2".split(","));
list.add("a, a3, vvv3".split(","));
list.add("a, a4, vvv4".split(","));
list.add("b, a1, vvv5".split(","));
list.add("b, a2, vvv6".split(","));
list.add("b, a3, vvv7".split(","));
list.add("b, a4, vvv8".split(","));
list.add("c, a5, vvv9".split(","));
list.add("c, a6, vvv10".split(","));
list.add("c, a1, vvv11".split(","));
list.add("c, a2, vvv12".split(","));
list.add("d, a3, vvv13".split(","));
list.add("e, a4, vvv14".split(","));
list.add("f, a5, vvv15".split(","));
add(TABLE_NAME, "100002", list);
scan(TABLE_NAME);
System.out.println();
scanByrowKey(TABLE_NAME, "100002");
dropTable(TABLE_NAME);
}
}
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