MyBatis-plus 通過 wrapper.and方法給sql添加額外的查詢條件

MyBatis-plus方法:

    public Children and(boolean condition, Consumer<Children> consumer) {
        return this.and(condition).addNestedCondition(condition, consumer);
    }

一、需求：如果用戶穿插了查詢參數，就給sql附加條件（當然，這個條件可以是復雜的條件），否則查詢不用帶上條件。

示例：

    @org.junit.Test
    public void test() {
        String name = "狗哥";
        QueryWrapper<Animal> wrapper = new QueryWrapper<>();
        wrapper.and(StringUtils.isNotBlank(name),item->item.apply(
                "FIND_IN_SET({0},name)",name));
        List<Animal> animalList = animalMapper.selectList(wrapper);
        log.info("總記錄：{}",animalList.size());
        animalList.forEach(System.out::println);
    }

一、需求：如果用戶穿插了查詢參數，就給sql附加條件（當然，這個條件可以是復雜的條件），否則查詢其他的條件。

    default Children and(Consumer<Param> consumer) {
        return this.and(true, consumer);
    }

    @org.junit.Test
    public void test() {
        String name = "";
        QueryWrapper<Animal> wrapper = new QueryWrapper<>();
        wrapper.and(item->item.apply(
                "FIND_IN_SET({0},name)",name).or().eq("name","貓哥"));
        List<Animal> animalList = animalMapper.selectList(wrapper);
        log.info("總記錄：{}",animalList.size());
        animalList.forEach(System.out::println);
    }

 wrapper.apply("(receipt_no Like '%"+incomeCollectionReceipt.getSearchValue()+"%' or customer Like '%"+incomeCollectionReceipt.getSearchValue()+"%' or matter Like '%"+incomeCollectionReceipt.getSearchValue()+"%' or bill_unit Like '%"+incomeCollectionReceipt.getSearchValue()+"%' or receipt_money Like '%"+incomeCollectionReceipt.getSearchValue()+"%' or item_name Like '%"+incomeCollectionReceipt.getSearchValue()+"%')");