转的：

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AND:

public void testAnd(){  
    //agender='female' AND age > 27    
    DBObject queryCondition = new BasicDBObject();  
    queryCondition.put("agender", "female");  
    queryCondition.put("age", new BasicDBObject("$gt", 27));  
    DBCursor dbCursor = coll.find(queryCondition);  
    assertEquals(1, dbCursor.size());  
    assertEquals("Jane", dbCursor.next().get("username"));  
}  

?

OR:

public void testOrSingleField(){  
    DBObject queryCondition = new BasicDBObject();        
    //age<15 OR age>27  
    queryCondition = new BasicDBObject();  
    BasicDBList values = new BasicDBList();  
    values.add(new BasicDBObject("age", new BasicDBObject("$gt", 27)));  
    values.add(new BasicDBObject("age", new BasicDBObject("$lt", 15)));  
    queryCondition.put("$or", values);  
      
    DBCursor dbCursor = coll.find(queryCondition);  
    assertEquals(3, dbCursor.size());  
    assertEquals("tom", dbCursor.next().get("username"));  
}  

?

OR:

public void testOrMultiFields(){  
    DBObject queryCondition = new BasicDBObject();        
    //agender=female OR age<=23  
    queryCondition = new BasicDBObject();  
    BasicDBList values = new BasicDBList();  
    values.add(new BasicDBObject("agender", "female"));  
    values.add(new BasicDBObject("age", new BasicDBObject("$lte", 23)));  
    queryCondition.put("$or", values);  
      
    DBCursor dbCursor = coll.find(queryCondition);  
    assertEquals(4, dbCursor.size());  
    assertEquals("Jim", dbCursor.next().get("username"));  
}

?

IN:

public void testIn(){  
    DBObject queryCondition = new BasicDBObject();        
    //age in [13, 47]  
    queryCondition = new BasicDBObject();  
    BasicDBList values = new BasicDBList();  
    values.add(13);  
    values.add(47);  
    queryCondition.put("age", new BasicDBObject("$in", values));  
      
    DBCursor dbCursor = coll.find(queryCondition);  
    assertEquals(2, dbCursor.size());  
    assertEquals("tom", dbCursor.next().get("username"));  
}  

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