MybatisPlus根据特定条件批量更新指定字段

先上代码

    private boolean updateBatchByQueryWrapper(Collection<Route> entityList, Function<Route, QueryWrapper> queryWrapperFunction) {
        String sqlStatement = this.getSqlStatement(SqlMethod.UPDATE);
        System.out.println("sqlStatement = " + sqlStatement);
        return this.executeBatch(entityList, DEFAULT_BATCH_SIZE, (sqlSession, entity) -> {
            MapperMethod.ParamMap param = new MapperMethod.ParamMap();
            param.put(Constants.ENTITY, entity);
            param.put(Constants.WRAPPER, queryWrapperFunction.apply(entity));
            System.out.println("sqlStatement = " + sqlStatement);
            sqlSession.update(sqlStatement, param);
        });
    }

    @Override
    public void test() {
        Route route = new Route();
        route.setParentIndexes("1,2,3");
        route.setProductId(955);
        route.setId(378);
        Route route2 = new Route();
        route2.setParentIndexes("1,2");
        route2.setId(379);

        List<Route> list = new ArrayList<>(2);
        list.add(route);list.add(route2);
        this.updateBatchByQueryWrapper(list,route3->new QueryWrapper<>().eq("id",route3.getId()));
    }

乍一看看感觉没问题，但是如果Route bean中有

@TableField(updateStrategy = FieldStrategy.IGNORED)

那么null值，直接更新了，这明显就出bug了，但是又不能取消，因为确实有场景要用。

查了相关资料，可用  on duplicate  也可以用 foreach 并开启&allowMultiQueries=true ，也可以自定义 SQL注入器扩展

结合老项目实际情况。选择foreach 上代码

    <update id="updateBatch" parameterType="java.util.List">
        <foreach collection="list" item="item" index="index" open="" close="" separator=";">
            update route
            <set>
                parent_indexes=#{item.parentIndexes}
            </set>
            where id = ${item.id}
        </foreach>
    </update>

 结果