HBase学习之路 HBase的API操作
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Eclipse环境搭建
具体的jar的引入方式可以参考http://www.cnblogs.com/qingyunzong/p/8623309.html
HBase API操作表和数据
1 import java.io.IOException; 2 import java.util.Date; 3 4 import org.apache.hadoop.conf.Configuration; 5 import org.apache.hadoop.hbase.HBaseConfiguration; 6 import org.apache.hadoop.hbase.HColumnDescriptor; 7 import org.apache.hadoop.hbase.HTableDescriptor; 8 import org.apache.hadoop.hbase.TableName; 9 import org.apache.hadoop.hbase.client.Admin; 10 import org.apache.hadoop.hbase.client.Connection; 11 import org.apache.hadoop.hbase.client.ConnectionFactory; 12 import org.apache.hadoop.hbase.client.Delete; 13 import org.apache.hadoop.hbase.client.Get; 14 import org.apache.hadoop.hbase.client.Put; 15 import org.apache.hadoop.hbase.client.Result; 16 import org.apache.hadoop.hbase.client.ResultScanner; 17 import org.apache.hadoop.hbase.client.Scan; 18 import org.apache.hadoop.hbase.client.Table; 19 20 import com.study.hbase.service.HBaseUtils; 21 22 public class HBaseUtilsImpl implements HBaseUtils { 23 24 private static final String ZK_CONNECT_KEY = "hbase.zookeeper.quorum"; 25 private static final String ZK_CONNECT_VALUE = "hadoop1:2181,hadoop2:2181,hadoop3:2181"; 26 27 private static Connection conn = null; 28 private static Admin admin = null; 29 30 public static void main(String[] args) throws Exception { 31 32 getConnection(); 33 getAdmin(); 34 35 HBaseUtilsImpl hbu = new HBaseUtilsImpl(); 36 37 38 //hbu.getAllTables(); 39 40 //hbu.descTable("people"); 41 42 //String[] infos = {"info","family"}; 43 //hbu.createTable("people", infos); 44 45 //String[] add = {"cs1","cs2"}; 46 //String[] remove = {"cf1","cf2"}; 47 48 //HColumnDescriptor hc = new HColumnDescriptor("sixsixsix"); 49 50 //hbu.modifyTable("stu",hc); 51 //hbu.getAllTables(); 52 53 54 hbu.putData("huoying", "rk001", "cs2", "name", "aobama",new Date().getTime()); 55 hbu.getAllTables(); 56 57 conn.close(); 58 } 59 60 // 获取连接 61 public static Connection getConnection() { 62 // 创建一个可以用来管理hbase配置信息的conf对象 63 Configuration conf = HBaseConfiguration.create(); 64 // 设置当前的程序去寻找的hbase在哪里 65 conf.set(ZK_CONNECT_KEY, ZK_CONNECT_VALUE); 66 try { 67 conn = ConnectionFactory.createConnection(conf); 68 } catch (IOException e) { 69 e.printStackTrace(); 70 } 71 return conn; 72 } 73 74 // 获取管理员对象 75 public static Admin getAdmin() { 76 try { 77 admin = conn.getAdmin(); 78 } catch (IOException e) { 79 e.printStackTrace(); 80 } 81 return admin; 82 } 83 84 // 查询所有表 85 @Override 86 public void getAllTables() throws Exception { 87 //获取列簇的描述信息 88 HTableDescriptor[] listTables = admin.listTables(); 89 for (HTableDescriptor listTable : listTables) { 90 //转化为表名 91 String tbName = listTable.getNameAsString(); 92 //获取列的描述信息 93 HColumnDescriptor[] columnFamilies = listTable.getColumnFamilies(); 94 System.out.println("tableName:"+tbName); 95 for(HColumnDescriptor columnFamilie : columnFamilies) { 96 //获取列簇的名字 97 String columnFamilyName = columnFamilie.getNameAsString(); 98 System.out.print("\\t"+"columnFamilyName:"+columnFamilyName); 99 } 100 System.out.println(); 101 } 102 103 } 104 105 // 创建表，传参，表名和列簇的名字 106 @Override 107 public void createTable(String tableName, String[] family) throws Exception { 108 109 TableName name = TableName.valueOf(tableName); 110 //判断表是否存在 111 if(admin.tableExists(name)) { 112 System.out.println("table已经存在！"); 113 }else { 114 //表的列簇示例 115 HTableDescriptor htd = new HTableDescriptor(name); 116 //向列簇中添加列的信息 117 for(String str : family) { 118 HColumnDescriptor hcd = new HColumnDescriptor(str); 119 htd.addFamily(hcd); 120 } 121 //创建表 122 admin.createTable(htd); 123 //判断表是否创建成功 124 if(admin.tableExists(name)) { 125 System.out.println("table创建成功"); 126 }else { 127 System.out.println("table创建失败"); 128 } 129 } 130 131 } 132 133 // 创建表，传参:封装好的多个列簇 134 @Override 135 public void createTable(HTableDescriptor htds) throws Exception { 136 //获得表的名字 137 String tbName = htds.getNameAsString(); 138 139 admin.createTable(htds); 140 } 141 142 // 创建表，传参，表名和封装好的多个列簇 143 @Override 144 public void createTable(String tableName, HTableDescriptor htds) throws Exception { 145 146 TableName name = TableName.valueOf(tableName); 147 148 if(admin.tableExists(name)) { 149 System.out.println("table已经存在！"); 150 }else { 151 admin.createTable(htds); 152 boolean flag = admin.tableExists(name); 153 System.out.println(flag ? "创建成功" : "创建失败"); 154 } 155 156 } 157 158 159 // 查看表的列簇属性 160 @Override 161 public void descTable(String tableName) throws Exception { 162 //转化为表名 163 TableName name = TableName.valueOf(tableName); 164 //判断表是否存在 165 if(admin.tableExists(name)) { 166 //获取表中列簇的描述信息 167 HTableDescriptor tableDescriptor = admin.getTableDescriptor(name); 168 //获取列簇中列的信息 169 HColumnDescriptor[] columnFamilies = tableDescriptor.getColumnFamilies(); 170 for(HColumnDescriptor columnFamily : columnFamilies) { 171 System.out.println(columnFamily); 172 } 173 174 }else { 175 System.out.println("table不存在"); 176 } 177 178 } 179 180 // 判断表存在不存在 181 @Override 182 public boolean existTable(String tableName) throws Exception { 183 TableName name = TableName.valueOf(tableName); 184 return admin.tableExists(name); 185 } 186 187 // disable表 188 @Override 189 public void disableTable(String tableName) throws Exception { 190 191 TableName name = TableName.valueOf(tableName); 192 193 if(admin.tableExists(name)) { 194 if(admin.isTableEnabled(name)) { 195 admin.disableTable(name); 196 }else { 197 System.out.println("table不是活动状态"); 198 } 199 }else { 200 System.out.println("table不存在"); 201 } 202 203 } 204 205 // drop表 206 @Override 207 public void dropTable(String tableName) throws Exception { 208 //转化为表名 209 TableName name = TableName.valueOf(tableName); 210 //判断表是否存在 211 if(admin.tableExists(name)) { 212 //判断表是否处于可用状态 213 boolean tableEnabled = admin.isTableEnabled(name); 214 215 if(tableEnabled) { 216 //使表变成不可用状态 217 admin.disableTable(name); 218 } 219 //删除表 220 admin.deleteTable(name); 221 //判断表是否存在 222 if(admin.tableExists(name)) { 223 System.out.println("删除失败"); 224 }else { 225 System.out.println("删除成功"); 226 } 227 228 }else { 229 System.out.println("table不存在"); 230 } 231 232 233 } 234 235 // 修改表(增加和删除) 236 @Override 237 public void modifyTable(String tableName) throws Exception { 238 //转化为表名 239 TableName name = TableName.valueOf(tableName); 240 //判断表是否存在 241 if(admin.tableExists(name)) { 242 //判断表是否可用状态 243 boolean tableEnabled = admin.isTableEnabled(name); 244 245 if(tableEnabled) { 246 //使表变成不可用 247 admin.disableTable(name); 248 } 249 //根据表名得到表 250 HTableDescriptor tableDescriptor = admin.getTableDescriptor(name); 251 //创建列簇结构对象 252 HColumnDescriptor columnFamily1 = new HColumnDescriptor("cf1".getBytes()); 253 HColumnDescriptor columnFamily2 = new HColumnDescriptor("cf2".getBytes()); 254 255 tableDescriptor.addFamily(columnFamily1); 256 tableDescriptor.addFamily(columnFamily2); 257 //替换该表所有的列簇 258 admin.modifyTable(name, tableDescriptor); 259 260 }else { 261 System.out.println("table不存在"); 262 } 263 } 264 265 // 修改表(增加和删除) 266 @Override 267 public void modifyTable(String tableName, String[] addColumn, String[] removeColumn) throws Exception { 268 //转化为表名 269 TableName name = TableName.valueOf(tableName); 270 //判断表是否存在 271 if(admin.tableExists(name)) { 272 //判断表是否可用状态 273 boolean tableEnabled = admin.isTableEnabled(name); 274 275 if(tableEnabled) { 276 //使表变成不可用 277 admin.disableTable(name); 278 } 279 //根据表名得到表 280 HTableDescriptor tableDescriptor = admin.getTableDescriptor(name); 281 //创建列簇结构对象，添加列 282 for(String add : addColumn) { 283 HColumnDescriptor addColumnDescriptor = new HColumnDescriptor(add); 284 tableDescriptor.addFamily(addColumnDescriptor); 285 } 286 //创建列簇结构对象，删除列 287 for(String remove : removeColumn) { 288 HColumnDescriptor removeColumnDescriptor = new HColumnDescriptor(remove); 289 tableDescriptor.removeFamily(removeColumnDescriptor.getName()); 290 } 291 292 admin.modifyTable(name, tableDescriptor); 293 294 295 }else { 296 System.out.println("table不存在"); 297 } 298 299 } 300 301 @Override 302 public void modifyTable(String tableName, HColumnDescriptor hcds) throws Exception { 303 //转化为表名 304 TableName name = TableName.valueOf(tableName); 305 //根据表名得到表 306 HTableDescriptor tableDescriptor = admin.getTableDescriptor(name); 307 //获取表中所有的列簇信息 308 HColumnDescriptor[] columnFamilies = tableDescriptor.getColumnFamilies(); 309 310 boolean flag = false; 311 //判断参数中传入的列簇是否已经在表中存在 312 for(HColumnDescriptor columnFamily : columnFamilies) { 313 if(columnFamily.equals(hcds)) { 314 flag = true; 315 } 316 } 317 //存在提示，不存在直接添加该列簇信息 318 if(flag) { 319 System.out.println("该列簇已经存在"); 320 }else { 321 tableDescriptor.addFamily(hcds); 322 admin.modifyTable(name, tableDescriptor); 323 } 324 325 } 326 327 328 /**添加数据 329 *tableName: 表明 330 *rowKey: 行键 331 *familyName:列簇 332 *columnName:列名 333 *value: 值 334 */ 335 @Override 336 public void putData(String tableName, String rowKey, String familyName, String columnName, String value) 337 throws Exception { 338 //转化为表名 339 TableName name = TableName.valueOf(tableName); 340 //添加数据之前先判断表是否存在，不存在的话先创建表 341 if(admin.tableExists(name)) { 342 343 }else { 344 //根据表明创建表结构 345 HTableDescriptor tableDescriptor = new HTableDescriptor(name); 346 //定义列簇的名字 347 HColumnDescriptor columnFamilyName = new HColumnDescriptor(familyName); 348 tableDescriptor.addFamily(columnFamilyName); 349 admin.createTable(tableDescriptor); 350 351 } 352 353 Table table = conn.getTable(name); 354 Put put = new Put(rowKey.getBytes()); 355 356 put.addColumn(familyName.getBytes(), columnName.getBytes(), value.getBytes()); 357 table.put(put); 358 359 } 360 361 @Override 362 public void putData(String tableName, String rowKey, String familyName, String columnName, String value, 363 long timestamp) throws Exception { 364 365 // 转化为表名 366 TableName name = TableName.valueOf(tableName); 367 // 添加数据之前先判断表是否存在，不存在的话先创建表 368 if (admin.tableExists(name)) { 369 370 } else { 371 // 根据表明创建表结构 372 HTableDescriptor tableDescriptor = new HTableDescriptor(name); 373 // 定义列簇的名字 374 HColumnDescriptor columnFamilyName = new HColumnDescriptor(familyName); 375 tableDescriptor.addFamily(columnFamilyName); 376 admin.createTable(tableDescriptor); 377 378 } 379 380 Table table = conn.getTable(name); 381 Put put = new Put(rowKey.getBytes()); 382 383 //put.addColumn(familyName.getBytes(), columnName.getBytes(), value.getBytes()); 384 put.addImmutable(familyName.getBytes(), columnName.getBytes(), timestamp, value.getBytes()); 385 table.put(put); 386 387 } 388 389 390 // 根据rowkey查询数据 391 @Override 392 public Result getResult(String tableName, String rowKey) throws Exception { 393 394 Result result; 395 TableName name = TableName.valueOf(tableName); 396 if(admin.tableExists(name)) { 397 Table table = conn.getTable(name); 398 Get get = new Get(rowKey.getBytes()); 399 result = table.get(get); 400 401 }else { 402 result = null; 403 } 404 405 return result; 406 } 407 408 // 根据rowkey查询数据 409 @Override 410 public Result getResult(String tableName, String rowKey, String familyName) throws Exception { 411 Result result; 412 TableName name = TableName.valueOf(tableName); 413 if(admin.tableExists(name)) { 414 Table table = conn.getTable(name); 415 Get get = new Get(rowKey.getBytes()); 416 get.addFamily(familyName.getBytes()); 417 result = table.get(get); 418 419 }else { 420 result = null; 421 } 422 423 return result; 424 } 425 426 // 根据rowkey查询数据 427 @Override 428 public Result getResult(String tableName, String rowKey, String familyName, String columnName) throws Exception { 429 430 Result result; 431 TableName name = TableName.valueOf(tableName); 432 if(admin.tableExists(name)) { 433 Table table = conn.getTable(name); 434 Get get = new Get(rowKey.getBytes()); 435 get.addColumn(familyName.getBytes(), columnName.getBytes()); 436 result = table.get(get); 437 以上是关于HBase学习之路 HBase的API操作的主要内容，如果未能解决你的问题，请参考以下文章