package com.javaer.mongo; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.Date; import java.util.regex.Pattern; import org.bson.types.ObjectId; import com.mongodb.BasicDBObject; import com.mongodb.BasicDBObjectBuilder; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.DBRef; import com.mongodb.Mongo; public class JavaTypes {  /**   * @param args   * @throws UnknownHostException   */  public static void main(String[] args) throws UnknownHostException {   //基础ID，自动增加  结构类似503991d90364b431cdc798e2   ObjectId id = new ObjectId();   System.out.println(id);    id = new ObjectId();    System.out.println(id);    //5039924c0364f4a124555e42   // 5039924c0364f4a124555e43  连续使用，自动增加，否则随机生成    Mongo m = new Mongo();    DB db = m.getDB("yuexiaosheng");    DBCollection coll = db.getCollection("mycollection");      //使用标准库的正则表达式，可以搜索数据里记录。类似mysql中条件 where title like '%name%'    Pattern john = Pattern.compile(".*?jack*.?",Pattern.CASE_INSENSITIVE);    BasicDBObject query = new BasicDBObject("title", john);    DBCursor cursor = coll.find(query);    try {              while(cursor.hasNext()) {                  System.out.println(cursor.next());              }          } finally {              cursor.close();          }    //mongodb中的时间类型    Date now = new Date();    BasicDBObject time = new BasicDBObject("ts", now);    coll.save(time);   //插入的记录 { "_id" : ObjectId("503993b20364129f6625d349"), "ts" : ISODate("2012-08-26T03:10:42.146Z") }    //mongodb中的数组结构。    ArrayList x = new ArrayList();    x.add(1);    x.add(2);    x.add(new BasicDBObject("foo", "bar"));    x.add(4);    BasicDBObject doc = new BasicDBObject("x", x);    coll.save(doc);    //插入的记录  { "_id" : ObjectId("503994500364bf9957b271a6"), "x" : [ 1, 2, { "foo" : "bar" }, 4 ] }      //存储mongodb的数据结构数据到数据库里    DBRef addressRef = new DBRef(db, "foo.bar", id);    DBObject address = addressRef.fetch();    DBObject person = BasicDBObjectBuilder.start()        .add("name", "Fred")        .add("address", addressRef)        .get();    coll.save(person);    //插入的数据记录    //{ "_id" : ObjectId("503995390364fcf1b54905b2"), "name" : "Fred", "address" : { "$ref" : "foo.bar", "$id" : ObjectId("503995390364fcf1b54905af") } }    DBObject fred = coll.findOne();    DBRef addressObj = (DBRef)fred.get("address");    System.out.println(addressObj);    // { "$ref" : "foo.bar", "$id" : "5039965c03648efcd6281311  } }