hbase基本操作源码
package homework; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Scanner; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.Cell; 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.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.Delete; 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.util.Bytes; public class Test_Two { public static Configuration configuration; public static Connection connection; public static Admin admin; //建立连接 public static void init(){ configuration = HBaseConfiguration.create(); configuration.set("hbase.rootdir","hdfs://localhost:8020/hbase"); try{ connection = ConnectionFactory.createConnection(configuration); admin = connection.getAdmin(); }catch (IOException e){ e.printStackTrace(); } } //关闭连接 public static void close(){ try{ if(admin != null){ admin.close(); } if(null != connection){ connection.close(); } }catch (IOException e){ e.printStackTrace(); } } public static void createTable(String tableName,String[] fields) throws IOException { init(); TableName tablename = TableName.valueOf(tableName); if(admin.tableExists(tablename)){ System.out.println("表已存在,将执行删除原表,重建新表!"); admin.disableTable(tablename); admin.deleteTable(tablename);//删除原来的表 } HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName)); for(String str:fields){ HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(str); hTableDescriptor.addFamily(hColumnDescriptor); } admin.createTable(hTableDescriptor); System.out.println("表已创建成功"); close(); } /** * 向表 tableName、行 row(用 S_Name 表示)和字符串数组 fields 指定的单元格中 * 添加对应的数据 values。 * 其中,fields 中每个元素如果对应的列族下还有相应的列限定符的话, * 用“columnFamily:column”表示。 * 例如,同时向“Math”、“Computer Science”、“English”三列添加成绩时, * 字符串数组 fields 为{“Score:Math”, ”Score:Computer Science”, ”Score:English”}, * 数组values 存储这三门课的成绩。 */ public static void addRecord(String tableName,String rowKey,String []fields,String [] values) throws IOException { init(); Table table = connection.getTable(TableName.valueOf(tableName)); for (int i = 0; i < fields.length; i++) { Put put = new Put(rowKey.getBytes()); String [] cols = fields[i].split(":"); if(cols.length==1) { put.addColumn(cols[0].getBytes(), "".getBytes(), values[i].getBytes());//因为当输入的是单列族,split仅读出一个字符字符串,即cols仅有一个元素 } else { put.addColumn(cols[0].getBytes(), cols[1].getBytes(), values[i].getBytes()); } table.put(put); } table.close(); close(); } /** * 根据表名查找表信息 */ public static void getData(String tableName)throws IOException{ init(); Table table = connection.getTable(TableName.valueOf(tableName)); Scan scan = new Scan(); ResultScanner scanner = table.getScanner(scan); for(Result result:scanner) { showCell((result)); } close(); } /** * 格式化输出 * @param result */ public static void showCell(Result result){ Cell[] cells = result.rawCells(); for(Cell cell:cells){ System.out.println("RowName(行键):"+new String(CellUtil.cloneRow(cell))+" "); System.out.println("Timetamp(时间戳):"+cell.getTimestamp()+" "); System.out.println("column Family(列簇):"+new String(CellUtil.cloneFamily(cell))+" "); System.out.println("column Name(列名):"+new String(CellUtil.cloneQualifier(cell))+" "); System.out.println("value:(值)"+new String(CellUtil.cloneValue(cell))+" "); System.out.println(); } } /** * 浏览表 tableName 某一列的数据,如果某一行记录中该列数据不存在,则返回 null。 * 要求当参数 column 为某一列族名称时,如果底下有若干个列限定符,则要列出每个列限定符代表的列的数据; * 当参数 column 为某一列具体名称(例如“Score:Math”)时,只需要列出该列的数据。 * @param tableName * @param column * @throws IOException */ public static void scanColumn (String tableName,String column) throws IOException { init(); Table table = connection.getTable(TableName.valueOf(tableName)); Scan scan = new Scan(); String [] cols = column.split(":"); if(cols.length==1) { scan.addFamily(Bytes.toBytes(column)); } else { scan.addColumn(Bytes.toBytes(cols[0]),Bytes.toBytes(cols[1])); } ResultScanner scanner = table.getScanner(scan); for (Result result = scanner.next(); result !=null;result = scanner.next()) { showCell(result); } table.close(); close(); } /** * 修改表 tableName,行 row(可以用学生姓名 S_Name 表示),列 column 指定的单元格的数据。 * @throws IOException */ public static void modifyData(String tableName,String rowKey,String column,String value) throws IOException { init(); Table table = connection.getTable(TableName.valueOf(tableName)); Put put = new Put(rowKey.getBytes()); String [] cols = column.split(":"); if(cols.length==1) { put.addColumn(column.getBytes(),"".getBytes() , value.getBytes());//qualifier:列族下的列名 } else { put.addColumn(cols[0].getBytes(),cols[1].getBytes() , value.getBytes());//qualifier:列族下的列名 } table.put(put); table.close(); close(); } /** * 删除表 tableName 中 row 指定的行的记录。 * @throws IOException */ public static void deleteRow(String tableName,String rowKey) throws IOException { init(); Table table = connection.getTable(TableName.valueOf(tableName)); Delete delete = new Delete(rowKey.getBytes()); table.delete(delete); table.close(); close(); } /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub Test_Two test_Two = new Test_Two(); boolean flag =true; while(flag) { System.out.println("------------------------------------------------提供以下功能----------------------------------------------"); System.out.println(" 1- createTable(创建表 ,提供表名、列族名) "); System.out.println(" 2-addRecord (向已知表名、行键、列簇的表添加值) "); System.out.println(" 3- ScanColumn(浏览表 某一列的数据) "); System.out.println(" 4- modifyData(修改某表 某行,某一列,指定的单元格的数据) "); System.out.println(" 5- deleteRow(删除 某表 某行的记录) "); System.out.println("------------------------------------------------------------------------------------------------------------------"); Scanner scan = new Scanner(System.in); String choose1=scan.nextLine(); switch (choose1) { case "1": { System.out.println("请输入要创建的表名"); String tableName=scan.nextLine(); System.out.println("请输入要创建的表的列族个数"); int Num=scan.nextInt(); String [] fields = new String[Num]; System.out.println("请输入要创建的表的列族"); /* Scanner scanner = new Scanner(System.in); scanner.next 如不是全局,即会记得上一次输出。相同地址读入值时*/ for(int i=0;i< fields.length;i++) { /*BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); fields[i] = in.readLine();*/ /*fields[i]=scan.next(); 因为之前没有输入过,所以可以读入新值*/ scan = new Scanner(System.in); fields[i]=scan.nextLine(); } System.out.println("正在执行创建表的操作"); test_Two.createTable(tableName,fields); break; } case "2": { System.out.println("请输入要添加数据的表名"); String tableName=scan.nextLine(); System.out.println("请输入要添加数据的表的行键"); String rowKey=scan.nextLine(); System.out.println("请输入要添加数据的表的列的个数"); int num =scan.nextInt(); String fields[]=new String[num]; System.out.println("请输入要添加数据的表的列信息 共"+num+"条信息"); for(int i=0;i< fields.length;i++) { BufferedReader in3= new BufferedReader(new InputStreamReader(System.in)); fields[i] = in3.readLine(); /*fields[i]=scan.next(); 因为之前没有输入过,所以可以读入新值*/ } System.out.println("请输入要添加的数据信息 共"+num+"条信息"); String values[]=new String[num]; for(int i=0;i< values.length;i++) { BufferedReader in2 = new BufferedReader(new InputStreamReader(System.in)); values[i] = in2.readLine(); } System.out.println("原表信息"); test_Two.getData(tableName); System.out.println("正在执行向表中添加数据的操作........\n"); test_Two.addRecord(tableName, rowKey, fields, values); System.out.println("\n添加后的表的信息........"); test_Two.getData(tableName); break; } case "3": { System.out.println("请输入要查看数据的表名"); String tableName=scan.nextLine(); System.out.println("请输入要查看数据的列名"); String column=scan.nextLine(); System.out.println("查看的信息如下:........\n"); test_Two.scanColumn(tableName, column); break; } case "4": { System.out.println("请输入要修改数据的表名"); String tableName=scan.nextLine(); System.out.println("请输入要修改数据的表的行键"); String rowKey=scan.nextLine(); System.out.println("请输入要修改数据的列名"); String column=scan.nextLine(); System.out.println("请输入要修改的数据信息 "); String value=scan.nextLine(); System.out.println("原表信息如下:........\n"); test_Two.getData(tableName); System.out.println("正在执行向表中修改数据的操作........\n"); test_Two.modifyData(tableName, rowKey, column, value); System.out.println("\n修改后的信息如下:........\n"); test_Two.getData(tableName); break; } case "5": { System.out.println("请输入要删除指定行的表名"); String tableName=scan.nextLine(); System.out.println("请输入要删除指定行的行键"); String rowKey=scan.nextLine(); System.out.println("原表信息如下:........\n"); test_Two.getData(tableName); System.out.println("正在执行向表中删除数据的操作........\n"); test_Two.deleteRow(tableName, rowKey); System.out.println("\n删除后的信息如下:........\n"); test_Two.getData(tableName); break; } default: { System.out.println(" 你的操作有误 !!! "); break; } } System.out.println(" 你要继续操作吗? 是-true 否-false "); flag=scan.nextBoolean(); } System.out.println(" 程序已退出! "); } }