Product name fuzzy search:

Process analysis ：

 

  Interface development ：

  Fuzzy query

sql：（productMapper）

/**
 *  Fuzzy search for product information based on keywords 
 * @param keyword
 * @param start
 * @param limit
 * @return
 */
public List<ProductVO> selectProductByKeyword(@Param("kw") String keyword,
                                                 @Param("start") int start,
                                                 @Param("limit") int limit);

The mapping file ：

<select id="selectProductByKeyword" resultMap="ProductVOMap2">
    select product_id,
           product_name,
           category_id,
           root_category_id,
           sold_num,
           product_status,
           content,
           create_time,
           update_time
    from product
    where product_name like #{kw}
    limit #{start},#{limit}
</select>

service Realization ：

public R searchProduct(String kw,int pageNum,int limit);

@Override
public R searchProduct(String kw, int pageNum, int limit) {
    //1. Query search results 
    kw = "%"+kw+"%";
    int start = (pageNum - 1)*limit;
    List<ProductVO> productVOS = productMapper.selectProductByKeyword(kw, start, limit);

    //2. Total number of records queried 
    Example example = new Example(Product.class);
    Example.Criteria criteria = example.createCriteria();
    criteria.andLike("productName",kw);
    int count = productMapper.selectCountByExample(example);

    //3. Calculate the total number of records 
    int pageCount = count%limit==0? count/limit:count/limit+1;

    //4. encapsulation , Return the data 
    PageHelper<ProductVO> pageHelper = new PageHelper<>(count,pageCount,productVOS);
    R r = new R(ResStatus.OK,"success",pageHelper);
    return r;
}

controller Realization ：

// Query commodity interface by keyword 
@GetMapping("/listbykeyword")
public R searchProducts(String keyword,int pageNum,int pageSize){
    return productService.searchProduct(keyword, pageNum, pageSize);
}

  Query the brand of the corresponding product according to the keyword ：

sql：

  Database implementation ：productMapper:

/**
 *  Query the brand list of related products according to the search keywords 
 * @param kw
 * @return
 */
public List<String> selectBrandByKeyword(String kw);

  The mapping file ：

<select id="selectBrandByKeyword" resultSets="java.util.List" resultType="String">
    select Distinct brand
    from product_params
    where product_id in (
        select product_id
        from product
        where product_name like #{kw}
    )
</select>

service Realization ：

public R listBrandsByKeyword(String kw);

@Override
public R listBrandsByKeyword(String kw) {
    kw = "%"+kw+"%";
    List<String> strings = productMapper.selectBrandByKeyword(kw);
    return new R(ResStatus.OK,"success",strings);
}

controller Realization ：

// Query the commodity brand interface according to keywords 
@GetMapping("/listbrandsByKeyword")
public R getBrandsByKeyword(String keyword){
    return productService.listBrandsByKeyword(keyword);
}