LambdaQueryWrapper 设置自定义排序

MybatisPlus版本

    com.baomidou    mybatis-plus-boot-starter    3.4.2    com.baomidou    mybatis-plus-extension    3.4.2

定义MybatisPlus工具类

import com.baomidou.mybatisplus.core.conditions.ISqlSegment;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;import com.baomidou.mybatisplus.core.metadata.OrderItem;import com.xnt.product.common.core.core.domain.OrderBy;import com.xnt.product.common.core.exception.CustomException;import java.util.List;import static com.baomidou.mybatisplus.core.enums.SqlKeyword.*;public class MybatisPlusUtil {        public static  void setOrderOne(LambdaQueryWrapper queryWrapper, String column, boolean asc) {        try {            ISqlSegment[] sqlSegments = {ORDER_BY, () -> column, asc ? ASC : DESC};            queryWrapper.getExpression().add(sqlSegments);        } catch (Exception e) {            e.printStackTrace();            throw new CustomException("设置排序出错：" + e.getMessage());        }    }        public static  void setOrder(LambdaQueryWrapper queryWrapper, OrderBy order) {        setOrderOne(queryWrapper, order.getColumn(), order.isAsc());    }        public static  void setOrder(LambdaQueryWrapper queryWrapper, List list) {        for (OrderBy order : list) {            setOrder(queryWrapper, order);        }    }        public static  void setOrderItem(LambdaQueryWrapper queryWrapper, OrderItem orderItem) {        setOrderOne(queryWrapper, orderItem.getColumn(), orderItem.isAsc());    }        public static  void setOrderItem(LambdaQueryWrapper queryWrapper, List list) {        for (OrderItem order : list) {            setOrderItem(queryWrapper, order);        }    }}

定义OrderBy实体类

@Datapublic class OrderBy {        @NotEmpty    private String column;        private boolean asc = true;        private boolean toUnder = false;    public String getColumn() {        return isToUnder() ? StrUtil.toUnderlineCase(column) : column;    }    public String getColumn(boolean toUnder) {        return toUnder ? StrUtil.toUnderlineCase(column) : column;    }        public OrderItem getOrderItem() {        return getOrderItem(isAsc(), isToUnder());    }        public OrderItem getOrderItem(boolean isAsc) {        return getOrderItem(isAsc, isToUnder());    }        public OrderItem getOrderItemToUnder(boolean isToUnder) {        return getOrderItem(isAsc(), isToUnder);    }        public OrderItem getOrderItem(String sort, boolean isToUnder) {        return getOrderItem(isAsc(), isToUnder);    }        public OrderItem getOrderItem(boolean isAsc, boolean isToUnder) {        String col = isToUnder ? StrUtil.toUnderlineCase(column) : column;        return OrderItemUtils.getOrder(col, isAsc);    }        public String getSql(){        return (isToUnder() ? StrUtil.toUnderlineCase(column) : column) + (this.isAsc()? " asc":" desc");    } }

使用自定义排序

1、获取前段参数

public List getOrderBys() {        String order = ServletUtils.getParameter(PageConstants.ORDER);        if (ObjectUtil.isEmpty(order)) {            return null;        }        List orderByList = new ArrayList<>();        if (JsonUtil.isTypeJSONArray(order)) {            orderByList.addAll(JsonUtil.toList(order, OrderBy.class));        } else {            orderByList.add(JsonUtil.parse(order, OrderBy.class));        }        return orderByList;    }

2、调用工具类

public List getList(SysOperLog operLog) {        LambdaQueryWrapper lambda = getLambda();           List list = getOrderItems();        if (ObjectUtils.isNotEmpty(list)) {            MybatisPlusUtil.setOrderItem(lambda, list);        } else {            lambda.orderByDesc(SysOperLog::getOperTime);        }        return super.list(lambda);    }

来源地址：https://blog.csdn.net/qq_43040552/article/details/129276021