mondoDB 常用query keywords

看了mongoDB的Java+Tutorial里用$gt 了标示greaterThan ，故想将所有可以使用的关键字找齐，搜寻mongoDB的java驱动jar包，发现如下2个类。

 

/**MongoDB keywords for various query operations**/
com.mongodb.QueryOperators

public class QueryOperators {
	public static final String GT = "$gt";
	public static final String GTE = "$gte";
	public static final String LT = "$lt";
	public static final String LTE = "$lte";
	public static final String NE = "$ne";
	public static final String IN = "$in";
	public static final String NIN = "$nin";
	public static final String MOD = "$mod";
	public static final String ALL = "$all";
	public static final String SIZE = "$size";
	public static final String EXISTS = "$exists";
	public static final String WHERE = "$where";
	public static final String NEAR = "$near";
}

 

   同时可以直接调用api来构造查询对象

/**
 * Utility for creating DBObject queries
 * 
 *
 */
com.mongodb.QueryBuilder