NoSQL Item Operations

Catalyst NoSQL items represent a collection of attributes that hold the data of a single data point, like records. Given below are the methods that you can use with an item and perform various operations on it.

Remove attributes from a constructed item

//public ZCNoSQLItem removeAttribute(String attrName) throws Exception;
item.removeAttribute("attribute name");

Get all the keys from the item being constructed

//public Iterable<Map.Entry>String, Object>> attributes();
item.attributes();

Check if the constructed item contains a specific attribute

//public boolean hasAttribute(String attrName);
item.hasAttribute("attribute name");

Getting the item as a map

//public Map asMap();
item.asMap();
//public Map<String, Object> getAllAttributesAsMap();
item.getAllAttributesAsMap();

Get the item as a JSON

//public String toJSON() throws Exception;
item.toJSON();

Get the count of the attributes in the constructed item

//public int numberOfAttributes();
item.numberOfAttributes();

ZCNoSQLAttribute

You can use the ZCNoSQLAttribute class to indicate the attributes upon which you perform the operations. To access the nested elements of a Map, you can separate the attributes using ‘,’ while using ZCNoSQLAttribute. To access a specific index of a list, you can denote it as “[<index>]”. This is demonstrated in the example below.

//public static ZCNoSQLAttribute getInstance(String ...pathElements) throws Exception;
//public ZCNoSQLAttribute(List<String> pathElements) throws Exception;
ZCNoSQLAttribute.getInstance("", …);
new ZCNoSQLAttribute("", …)

The datatypes supported by NoSQL can be denoted with the ZCNoSQLAttribute as follows:

ZCNoSQLValue

Objects of this class are used to indicate the value of attributes along with their data type, as shown below.

// public ZCNoSQLValue(DataType dataType, Object value) throws Exception;
//public static ZCNoSQLValue getInstance(DataType dataType, Object value) throws Exception;
new ZCNoSQLValue(<ZCNoSQLValue.DataType>, <Value>)
ZCNoSQLValue.getInstance(<ZCNoSQLValue.DataType>, <Value>)

ZCNoSQLResponseBean

This class contains the response of the SDK calls made to the server. This includes the following methods.

• getSize - Used to return the size of data read/write from or to the server.

//public int getSize();
responseBean.getSize();

• getStartKey - Used to return the start key for next set of data for pagination, if more data exists.

//public ZCNoSQLItem getStartKey();
responseBean.getStartKey();

• getResponseDataList - Returns the actual data. Based on the NOSQL_RETURN_VALUE, either the old or new data is returned in getNew_item() or getOld_Item() method.

//public List<Data> getResponseDataList();
responseBean.getResponseDataList().get(<index>).getNew_item();
responseBean.getResponseDataList().get(<index>).getOld_item();
responseBean.getResponseDataList().get(<index>).setStatus();