JAVA 後臺拼接分頁查詢SQL 

/**
	 * 拼接分頁查詢sql<br/>
	 * ORACLE,SQLSERVER,DB2,DM通用
	 * 
	 * @param field
	 * @param from
	 * @param page
	 * @param size
	 * @param orderBy
	 * @return
	 */
	public static String joinPageQuerySql(final String field, final String from, final String page, final String size,
			final String orderBy) {
		int pageNum = 1;// 頁數從1開始計數
		int sizeNum = SystemConstant.PAGE_SIZE;
		if (StringUtils.isNotBlank(page)) {
			pageNum = Integer.parseInt(page);
			if (pageNum < 1) {
				pageNum = 1;
			}
		}
		if (StringUtils.isNotBlank(size)) {
			sizeNum = Integer.parseInt(size);
			if (sizeNum < 0) {
				sizeNum = SystemConstant.PAGE_SIZE;
			}
		}
		StringBuilder buff = new StringBuilder("SELECT ");
		buff.append(field);
		buff.append(" FROM (SELECT ROW_NUMBER() OVER (ORDER BY ");
		buff.append(StringUtils.isNotBlank(orderBy) ? orderBy : field);
		buff.append(") AS RN,PAGE1.* FROM(");
		buff.append(from);
		buff.append(") PAGE1 ) PAGE2 WHERE RN <= ");
		buff.append(pageNum * sizeNum);
		buff.append(" AND RN > ");
		buff.append((pageNum - 1) * sizeNum);
		return buff.toString();
	}
	
	/**
	 * 示例
	 * @param args
	 */
	public static void main(String[] args) {
		String page = "1";
		String size = "15";
		String field = "USERID,USERNAME,SEX,EMAIL";
		String from = "SELECT USERID, USERNAME, SEX, EMAIL FROM SYS_USER ";
		String orderBy = "USERNAME";
		String sql = joinPageQuerySql(field, from.toString(), page, size, orderBy);
		System.out.println(sql);
	}