private static final String ENQUIRYSHOPPINGCART_INFO_SQL = "select IFNULL((select e.id from ap_products.enquiryshoppingcart e where e.enquiry_order_id=?),0)";
通过id查询为空时，返回0
mysql 查询为空处理
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转载自dj111111.iteye.com/blog/2089822
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