java 基于取模实现分表获取表名

	
	public static String getSplitTableName(String tableName, Object splitKeyVal, Integer subTableCount) {
		if(splitKeyVal == null){
			throw new RuntimeException("splitKeyVal is null.tableName:" +tableName);
		}

		long hashVal = splitKeyVal.toString().hashCode();

		// 斐波那契（Fibonacci）散列
		hashVal = ( hashVal * 2654435769L ) >> 28;

		// 避免hashVal超出 MAX_VALUE = 0x7fffffff时变为负数,取绝对值
		hashVal = Math.abs(hashVal) % subTableCount;
		String hashTableName = tableName + "_" + hashVal;
		if (logger.isDebugEnabled()) {
			logger.debug("used hash mod algorithm. build {}'s subtable name: {}. ", tableName, hashTableName);
		}
		return hashTableName;
	}