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  • mysql 假设存在id则设数据自添加1 ,不存在则加入。java月份计算比較

    </pre><pre name="code" class="sql">INSERT INTO invite_rejectlog_num (
    	player_id,
    	MONTH,
    	count,
    	last_modify_time
    	)
    	VALUES (#{playerId},#{month},#{count},#{lastModifyTime})
    	ON DUPLICATE KEY UPDATE count=count+1;


    须要唯一约束 id和月份



    ava月份计算比較

    Calendar calDelM = Calendar.getInstance();
    		calDelM.set(Calendar.MONTH, 0);
    		System.out.println(calDelM.get(Calendar.MONTH));
    		
    		calDelM.add(Calendar.MONTH, -1);
    		System.out.println(calDelM.get(Calendar.MONTH));
    
    		
    		
    		
    		// ix 遍历须要删除的月份
    		int isdel = calDelM.get(Calendar.MONTH);
    		int ix = 8;// 缓存最小月份
    
    		Calendar calDelM2 = Calendar.getInstance();
    		calDelM2.set(Calendar.MONTH, ix);
    		ix = calDelM2.get(Calendar.MONTH);
    
    	
    		// ix<isdel
    		Calendar calDelM3 = Calendar.getInstance();
    		calDelM3.set(Calendar.MONTH, calDelM.get(Calendar.MONTH));
    
    	
    
    		for (; calDelM2.compareTo(calDelM3) != -1;) {
    
    			System.out.println("================");
    			System.out.println("calDelM2:" + calDelM2.get(Calendar.MONTH) + "  "
    					+ "  calDelM:" + calDelM.get(Calendar.MONTH)+ "  calDelM3: " + calDelM3.get(Calendar.MONTH));
    			System.out.println(calDelM2.compareTo(calDelM3));
    
    			calDelM.add(Calendar.MONTH, -1);
    			isdel = calDelM.get(Calendar.MONTH);
    			calDelM3.set(Calendar.MONTH, calDelM.get(Calendar.MONTH));
    
    			System.out.println("del:" + isdel);
    			System.out.println("================");
    		}


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  • 原文地址:https://www.cnblogs.com/zfyouxi/p/5181077.html
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