mondoDB 常用query keywords
看了mongoDB的Java+Tutorial里用$gt 了标示greaterThan ，故想将所有可以使用的关键字找齐，搜寻mongoDB的java驱动jar包，发现如下2个类。/**MongoDB keywords for various query operations**/com.mongodb.QueryOperatorspublic class QueryOperators {public static final String GT = "$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
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