Nodejs operating HBase

First, make sure that the node. js and HBase environments are successfully built.

Insert data: You can use the put Method to insert data into a single column or multiple columns at the same time.

Example:

   1:  var hbase = require('hbase');

   2:  var client = hbase({

   3:      host:'localhost',

   4:      port:8090

   5:  });

   6:  var table = client.getTable('testPut');

   7:  table.create('cf',function(err,success){

   8:      this

   9:      .getRow('row3')

  10:      .put('cf:a','value1',function(err,success){

  11:          console.log('insert one column');

  12:          console.log(success);

  13:      });

  14:  });

  15:  var myTable = client.getTable('test');

  16:  myTable.create('cf',function(err,success){

  17:      this

  18:      .getRow('row2')

  19:      .put(['cf:a','cf:b','cf:c'],['a','b','c'],function(err,success){

  20:          console.log('insert multi columns');

  21:          console.log(success);

  22:      });

  23:  });

  24:  var cells = 

  25:  [{ column:'cf:a',timestamp:Date.now(),$: 'a'},

  26:   { column:'cf:b',timestamp:Date.now(),$: 'b'},

  27:   { column:'cf:c',timestamp:Date.now(),$: 'c'}

  28:  ];

  29:  myTable.create('cf',function(err,success){

  30:      this

  31:      .getRow('row1')

  32:      .put(cells,function(err,success){

  33:          console.log('insert multi columns user array');

  34:          console.log(success);

  35:      });

  36:  });

Display result:

Get data: You can use the get method to obtain data. You can obtain only one row and one column or multiple columns in one row at a time.

Example:

   1:  var hbase = require('hbase');

   2:  var client = hbase({

   3:      host:'localhost',

   4:      port:8090

   5:  });

   6:  var myRow = client.getTable('test').getRow('row1');

   7:  myRow.exists('cf',function(err,exists){

   8:      if(exists){

   9:          this.get('cf',function(err,values){

  10:              console.log('get column family');

  11:              console.log(values);

  12:          });

  13:      }

  14:  });

  15:  myRow.exists('cf:a',function(err,exists){

  16:      if(exists){

  17:          this.get('cf:a',function(err,value){

  18:              console.log('get column a');

  19:              console.log(value);

  20:          });

  21:      }

  22:  });

Display result:

Use the token to obtain data:

   1:  var hbase = require('hbase');

   2:  var scanner = hbase({host:'localhost',port:8090}).getScanner('test');

   3:  scanner.create({

   4:      batch:3

   5:  },function(err,success){

   6:      this.get(function(err,cells){

   7:          if(err){

   8:               console.log('err');

   9:          }

  10:          if(cells){

  11:              console.log(cells);

  12:          }else{

  13:              this.delete();

  14:          }

  15:      });

  16:  });

  17:   

Display result:

Delete data: Use the delete method.

 

   1:  var hbase = require('hbase');

   2:  var client = hbase({

   3:      host:'localhost',

   4:      port:8090

   5:  });

   6:  var table = client.getTable('test');

   7:  var row = table.getRow('row1');

   8:  row.delete(function(err,success){

   9:      if(success){

  10:          console.log('delete a row');

  11:      }

  12:  });

  13:  var row1 = table.getRow('row3');

  14:  row.delete('cf:b',function(err,success){

  15:      if(success){

  16:          console.log('delete a column');

  17:      }

  18:  });

  19:  row.delete(['cf:a','cf:c',],function(err,success){

  20:      if(success){

  21:          console.log('delete multi column');

  22:      }

  23:  });

After the deletion is successful, the log Content is displayed.