Spring Boot中引入HBase数据库
使用HBase API对数据库的基本操作，包括创建表、查找表数据等。
1、HBase配置
pom.xml
<!-- Apache HBase Client -->
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>2.0.1</version>
</dependency>
application.properties
HBase.nodes=10.xx.xx.43
HBase.maxsize=500000
HBaseConfig.java
@Configuration
public class HBaseConfig {
//HBase相关配置
@Value("${HBase.nodes}")
private String nodes;
@Value("${HBase.maxsize}")
private String maxsize;
@Bean
public HBaseService getHbaseService(){
org.apache.hadoop.conf.Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum",nodes );
conf.set("hbase.client.keyvalue.maxsize",maxsize);
return new HBaseService(conf);
}
}
2、业务模拟
HBaseService.java
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import .....
/**
* HBase数据库基本操作
*/
public class HBaseService {
private Logger log = LoggerFactory.getLogger(HBaseService.class);
// The administrative API for HBase
// Admin can be used to create, drop, list, enable and disable and
// otherwise modify tables,
// as well as perform other administrative operations.
private Admin admin = null;
private Connection connection = null;
public HBaseService(Configuration conf) {
try {
connection = ConnectionFactory.createConnection(conf);
admin = connection.getAdmin();
} catch (IOException e) {
log.error("获取HBase连接失败");
}
}
/**
* 创建表
* create , {NAME => , VERSIONS => }
* shell command: create ‘user’, ‘cf1’
*/
public boolean creatTable(String tableName, List<String> columnFamily) {
try {
//列族 column family
List<ColumnFamilyDescriptor> cfDesc = new ArrayList<>(columnFamily.size());
columnFamily.forEach(cf -> {
cfDesc.add(ColumnFamilyDescriptorBuilder.newBuilder(
Bytes.toBytes(cf)).build());
});
//表 table
TableDescriptor tableDesc = TableDescriptorBuilder
.newBuilder(TableName.valueOf(tableName))
.setColumnFamilies(cfDesc).build();
if (admin.tableExists(TableName.valueOf(tableName))) {
log.debug("table Exists!");
} else {
admin.createTable(tableDesc);
log.debug("create table Success!");
}
} catch (IOException e) {
log.error(MessageFormat.format("创建表{0}失败", tableName), e);
return false;
} finally {
close(admin, null, null);
}
return true;
}
/**
* 查询库中所有表的表名
* shell command: list
*/
public List<String> getAllTableNames() {
List<String> result = new ArrayList<>();
try {
TableName[] tableNames = admin.listTableNames();
for (TableName tableName : tableNames) {
result.add(tableName.getNameAsString());
}
} catch (IOException e) {
log.error("获取所有表的表名失败", e);
} finally {
close(admin, null, null);
}
return result;
}
/**
* 遍历查询指定表中的所有数据
* shell command: scan 'user'
*/
public Map<String, Map<String, String>> getResultScanner(String tableName) {
Scan scan = new Scan();
return this.queryData(tableName, scan);
}
/**
* 通过表名以及过滤条件查询数据
*/
private Map<String, Map<String, String>> queryData(String tableName,
Scan scan) {
// 3、测试
HBaseTest.java
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class HBaseTest {
@Autowired
private HBaseService hbaseService;
/**
* 测试删除、创建表
*/
@Test
public void testCreateTable() {
// 创建表
hbaseService.creatTable("test_base", Arrays.asList("f", "back"));
// 插入三条数据
hbaseService.putData("test_base", "66804_000001", "f", new String[] {
"project_id", "varName", "coefs", "pvalues", "tvalues",
"create_time" }, new String[] { "40866", "mob_3", "0.9416",
"0.0000", "12.2293", "null" });
hbaseService.putData("test_base", "66804_000002", "f", new String[] {
"project_id", "varName", "coefs", "pvalues", "tvalues",
"create_time" }, new String[] { "40866", "idno_prov", "0.9317",
"0.0000", "9.8679", "null" });
hbaseService.putData("test_base", "66804_000003", "f", new String[] {
"project_id", "varName", "coefs", "pvalues", "tvalues",
"create_time" }, new String[] { "40866", "education", "0.8984",
"0.0000", "25.5649", "null" });
// 查询数据
// 1. 根据rowKey查询
Map<String, String> result1 = hbaseService.getRowData("test_base",
"66804_000001");
System.out.println("+++++++++++根据rowKey查询+++++++++++");
result1.forEach((k, value) -> {
System.out.println(k + "---" + value);
});
System.out.println();
// 2. 遍历查询
Map<String, Map<String, String>> result2 = hbaseService
.getResultScanner("test_base");
System.out.println("+++++++++++遍历查询+++++++++++");
result2.forEach((k, value) -> {
System.out.println(k + "---" + value);
});
}
}
shell命令行查看表：
eclipse运行结果：
参考资料：https://www.zifangsky.cn/1286.html
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