条件查询 dao //根据搜索条件筛选数据 public List<User> GetUserBySearch(String userName, String sex) throws SQLException { String sql = "select * from User where 1=1 "; List<String> params = new ArrayList<String>(); if (userName != null &&
原查询 select sum(case when age<=16 then 1 else 0 end ) age1, sum(case when age>16 and age<=25 then 1 else 0 end ) age2, sum(case when age>25 and age<=35 then 1 else 0 end ) age3, sum(case when age>35 and age<=45 then 1 else 0 end ) age4
在Mybatis多条件查询中: 1.参数如果是多条件,则需要将将添加到Map集合中进行传入. 2.就是将其参数用有序数字进行代替. Mybatis单个String类型参数传递 mysql文如下,传入参数为‘parentCategoryId’,运行报错为:There is no getter for property named 'parentCategoryId' in 'class java.lang.String <select id="selectCategoryList"
------------吾亦无他,唯手熟尔,谦卑若愚,好学若饥------------- 实体类 public class Book { private Integer bookID; private String bookName; private String bookAuthor; private Integer bookPrice; public Book() { } public Integer getBookID() { return this.bookID; } public vo