------------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 void setBookID(Integer bookID) { this.bookID = bookID; } public String getBookName() { return this.bookName; } public void setBookName(String bookName) { this.bookName = bookName; } public String getBookAuthor() { return this.bookAuthor; } public void setBookAuthor(String bookAuthor) { this.bookAuthor = bookAuthor; } public Integer getBookPrice() { return this.bookPrice; } public void setBookPrice(Integer bookPrice) { this.bookPrice = bookPrice; } }
接口中的方法
俩种形式,一种采用map,一种采用直接参数Index(索引的方式)来实现的多条件查询
//根据多条件查询map版 public List<Book> findtrueBookMap(Map<String,Object> map); //根据多条件查询index版 public List<Book> findtrueBookIndex(String bookName,Integer bookPrice);
小配置中
<!--多条件查询map版--> <select id="findtrueBookMap" resultType="Book"> select * from book WHERE bookName LIKE ‘%‘ #{bookName} ‘%‘ AND bookPrice>#{bookPrice} </select> <!--多条件查询Index版--> <select id="findtrueBookIndex" resultType="Book"> select * from book WHERE bookName LIKE ‘%‘ #{0} ‘%‘ AND bookPrice>#{1} </select>
测试类中
///多条件查询Index版 @Test public void t4selectmoreIndex(){ SqlSession session= MyBatisUtils.getSession(); IBookDAO mapper = session.getMapper(IBookDAO.class); List<Book> books = mapper.findtrueBookIndex("心",40); for (Book items:books) { System.out.println(items.getBookName()); } session.close(); } ///多条件查询map版 @Test public void t3selectmoreMap(){ SqlSession session= MyBatisUtils.getSession(); IBookDAO mapper = session.getMapper(IBookDAO.class); Map<String,Object> map=new HashMap<String,Object>(); map.put("bookName","心"); map.put("bookPrice",40); List<Book> books = mapper.findtrueBookMap(map); for (Book items:books) { System.out.println(items.getBookName()); } session.close(); }
这块要解释的真的没有些什么,先照猫画虎,会用,知道每出该填什么,入们后再去想其他,有些从字面意思就可以理解,有些则是就应该这么写,mybatis中独特的写法,就像java中的关键字,理解就好
原文地址:https://www.cnblogs.com/DawnCHENXI/p/8467542.html
时间: 2024-10-24 10:51:25