Required tools/system libraries:
- gcc
- Java >= 1.6
- EJDB C library libtcejdb (from sources or as debian packages)
(A) Installing directly from sources
git clone https://github.com/Softmotions/ejdb-java.git
cd ./ejdb-java
./configure --with-jdk=<path to JDK> --prefix=<installation prefix>
make
sudo make install
package org.ejdb.sample1;
import org.ejdb.bson.BSONObject;
import org.ejdb.driver.EJDB;
import org.ejdb.driver.EJDBCollection;
import org.ejdb.driver.EJDBQueryBuilder;
import org.ejdb.driver.EJDBResultSet;
import java.util.Calendar;
import java.util.Date;
/**
* @author Tyutyunkov Vyacheslav (tve@softmotions.com)
* @version $Id$
*/
public class Main {
public static void main(String[] args) {
EJDB ejdb = new EJDB();
try {
// Used modes:
// - read
// - write
// - create db if not exists
// - truncate existing db
ejdb.open("zoo", EJDB.JBOREADER | EJDB.JBOWRITER | EJDB.JBOCREAT | EJDB.JBOTRUNC);
BSONObject parrot1 = new BSONObject("name", "Grenny")
.append("type", "African Grey")
.append("male", true)
.append("age", 1)
.append("birthhdate", new Date())
.append("likes", new String[]{"green color", "night", "toys"})
.append("extra1", null);
Calendar calendar = Calendar.getInstance();
calendar.set(2013, 1, 1, 0, 0, 1);
BSONObject parrot2 = new BSONObject();
parrot2.put("name", "Bounty");
parrot2.put("type", "Cockatoo");
parrot2.put("male", false);
parrot2.put("age", 15);
parrot2.put("birthdate", calendar.getTime());
parrot2.put("likes", new String[]{"sugar cane"});
parrot2.put("extra1", null);
System.out.println("parrot1 =\n\t\t" + parrot1);
System.out.println("parrot2 =\n\t\t" + parrot2);
EJDBCollection parrots = ejdb.getCollection("parrots");
// saving
parrots.save(parrot1);
parrots.save(parrot2);
EJDBQueryBuilder qb;
EJDBResultSet rs;
// Below two equivalent queries:
// Q1
qb = new EJDBQueryBuilder();
qb.field("likes", "toys")
.orderBy().asc("name").desc("age");
rs = parrots.createQuery(qb).find();
System.out.println();
System.out.println("Results (Q1): " + rs.length());
for (BSONObject r : rs) {
System.out.println("\t" + r);
}
rs.close();
// Q2
qb = new EJDBQueryBuilder();
qb.field("likes").eq("toys")
.orderBy().add("name", true).add("age", false);
rs = parrots.createQuery(qb).find();
System.out.println();
System.out.println("Results (Q2): " + rs.length());
for (BSONObject r : rs) {
System.out.println("\t" + r);
}
// Second way to iterate
System.out.println();
System.out.println("Results (Q2): " + rs.length());
for (int i = 0; i < rs.length(); ++i) {
System.out.println("\t" + i + " => " + rs.get(i));
}
rs.close();
} finally {
if (ejdb.isOpen()) {
ejdb.close();
}
}
}
}