Tablestore:Batch read data

Notes

A single batch read operation supports reading up to 100 rows of data.

Prerequisites

Initialize a Tablestore client

Method

batchGetRow: function batchGetRow(params, callback)

Examples

The following sample code reads two rows with primary key values row1 and row2 from the test_table table.

var table = {
    // Set the table name
    tableName: 'test_table',
    primaryKey: [
        // Add primary key information for row 1
        [{ 'id': 'row1' }],
        // Add primary key information for row 2
        [{ 'id': 'row2' }]
    ]
};
var params = {
    tables: [
        table
    ]
}

// Call the batchGetRow method to perform a batch data query
client.batchGetRow(params, function (err, data) {
    if (err) {
        console.log('Batch get row failed with error: ', err);
        return;
    }

    // Process the response
    console.log('* RequestId: ', data.RequestId);
    console.log('* Rows Data: ');
    data.tables.forEach(function (rows) {
        rows.forEach(function (row) {
            if (row.isOk) {
                console.log('Succeeded Row:', row.tableName, JSON.stringify(row.primaryKey), JSON.stringify(row.attributes));
            } else {
                console.log('Failed Row:', row.tableName, row.errorMessage);
            }
        });
    });
});

Use the following sample code as a reference when setting parameters for batch data reads.

• Read data from multiple tables. Batch read supports reading data from multiple tables in a single request. You can specify query conditions for each table.

  var table1 = {
      tableName: 'orders_small',
      primaryKey: [
          [{ 'order_id': '90fb478c-1360-11f0-a34d-00163e30a2a9' }]
      ]
  };
  
  var params = {
      tables: [
          table,
          table1
      ]
  };

• Set a data version range. Only data within the specified range is returned.

  // Set the version range to the past 24 hours from the current time
  table.timeRange = {
      startTime: (Date.now() - 86400 * 1000).toString(),
      endTime: Date.now().toString()
  }

• Specify attribute columns to read.

  table.columnsToGet = ['col2']

References

Range read data