Couch DB Java Integration : Couchdb4j

Sandeep Patel

Mar. 01, 13 · Interview

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COUCHDB4J API is library for accessing Documents from couch database.

This Library is downloaded from the link:-

http://code.google.com/p/couchdb4j/downloads/list

In this Demo , "Using FUTON Web Interface a student database is created and 4 student documents are created.The java program is written for accessing these documents and displaying the details in console output".

The Student Database in Futon looks like,

This library has some dependencies to these libraries,

commons-httpclient-3.1.jar, commons-beanutils.jar,
commons-codec-1.3.jar, commons-collections.jar,
commons-lang.jar,commons-logging-1.1.jar,
json-lib-2.0-jdk15.jar, ezmorph-1.0.3.jar

The Project Structure,showing all the dependencies jar libraries in the CLASSPATH,

The Java code is CouchDBTest.java is,

package com.sandeep.couchdb.util;
 
import java.util.List;
import com.fourspaces.couchdb.Database;
import com.fourspaces.couchdb.Document;
import com.fourspaces.couchdb.Session;
import com.fourspaces.couchdb.ViewResults;
 
public class CouchDBTest {
 
 /*These are the keys of student document in couch db*/
 public static final String STUDENT_KEY_NAME ="name";
  
 public static final String STUDENT_KEY_MARKS ="marks";
  
 public static final String STUDENT_KEY_ROLL="roll";
  
 public static final String STUDENT_KEY_CONTACT ="contact";
  
 public static void main(String[] args){
   
  /*Creating a session with couch db running in 5984 port*/
  Session studentDbSession = new Session("localhost",5984);
   
  /*Selecting the student database from list of couch database*/
  Database studentCouchDb = studentDbSession.getDatabase("student");
   
  /*Fetching all Student Document to ViewResult object*/
  ViewResults couchViewResults = studentCouchDb.getAllDocuments();
   
  /*Retieving all document as result to a List*/
  List<Document> studentDocuments = couchViewResults.getResults();
   
   
  for(Document couchDocument: studentDocuments){
    
   String id = couchDocument.getJSONObject().getString("id");
    
   Document studentRow = studentCouchDb.getDocument(id);
    
   System.out.println("__________START OF DOCUMENT("+studentRow.get("_id")+")_________");
    
   if(studentRow.containsKey(STUDENT_KEY_NAME)){
     
    System.out.println("NAME : "+studentRow.get(STUDENT_KEY_NAME));
     
   }
   if(studentRow.containsKey(STUDENT_KEY_MARKS)){
     
    System.out.println("MARK : "+studentRow.get(STUDENT_KEY_MARKS));
     
   }
    
   if(studentRow.containsKey(STUDENT_KEY_ROLL)){
     
    System.out.println("ROLL : "+studentRow.get(STUDENT_KEY_ROLL));
     
   }
   if(studentRow.containsKey(STUDENT_KEY_CONTACT)){
     
    System.out.println("CONTACT : "+studentRow.get(STUDENT_KEY_CONTACT));
     
   }
    
  }
 }
}

ViewResults(com.fourspaces.couchdb.ViewResults) is the class which stores all the document.The debug point screenshot,
- Couch db stores the data in Document format (com.fourspaces.couchdb.Document) package.

The output:-

     

 __________START OF DOCUMENT(326e49164d9b414a6c1ce2c8a802d175)_________
NAME : sandeep
MARK : 75
ROLL : 4
CONTACT : +91-1234567890
__________START OF DOCUMENT(326e49164d9b414a6c1ce2c8a802d28e)_________
NAME : sumanta
MARK : 80
ROLL : 3
__________START OF DOCUMENT(326e49164d9b414a6c1ce2c8a802dda1)_________
NAME : sangeeta
MARK : 95
ROLL : 7
__________START OF DOCUMENT(326e49164d9b414a6c1ce2c8a802f200)_________
NAME : Surabhi
MARK : 73
ROLL : 7

The output screenshot in java console,

Demo Code:-

Download link for demo code

Java (programming language) Integration

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Couch DB Java Integration : Couchdb4j

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