表格存储服务 CloudTable-修改表:代码样例

时间：2023-11-01 16:16:51

代码样例

public void testModifyTable() {   LOG .info("Entering testModifyTable.");  // Specify the column family name.  byte[] familyName = Bytes.toBytes("education");  Admin admin = null;  try {    // Instantiate an Admin object.    admin = conn.getAdmin();    // Obtain the table descriptor.    HTableDescriptor htd = admin.getTableDescriptor(tableName);    // Check whether the column family is specified before modification.    if (!htd.hasFamily(familyName)) {      // Create the column descriptor.      HColumnDescriptor hcd = new HColumnDescriptor(familyName);      htd.addFamily(hcd);      // Disable the table to get the table offline before modifying      // the table.      admin.disableTable(tableName);      // Submit a modifyTable request.      admin.modifyTable(tableName, htd);  //注[1]      // Enable the table to get the table online after modifying the      // table.      admin.enableTable(tableName);    }    LOG.info("Modify table successfully.");  } catch (IOException e) {    LOG.error("Modify table failed " ,e);  } finally {    if (admin != null) {      try {        // Close the Admin object.        admin.close();      } catch (IOException e) {        LOG.error("Close admin failed " ,e);      }    }  }  LOG.info("Exiting testModifyTable.");}

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