lambda.eq(实体类::get实体类字段, 入参) .orderByAsc(实体类::get实体类字段) .select(实体类::get实体类字段, 实体类::get实体类字段); 3.LambdaUpdateWrapper写法 LambdaUpdateWrapper<实体类> lambda = Wrappers.lambdaUpdate(实体类.class); lambda.set(实体类::getName,"张三") .eq(实体类::getId,...
orderByAsc(R... columns); // 等价于 ORDER BY 字段, ... ASC, 例: orderByAsc("id", "name") ---> order by id ASC,name ASC orderByDesc(R... columns); // 等价于 ORDER BY 字段, ... DESC, 例: orderByDesc("id", "name") ---> order by id DESC,name DESC having(String ...
private MapqueryWeight() { QueryWrapperwrapper = new QueryWrapper<>(); wrapper.lambda().likeRight(TagWeight::getTagType, "101109"); Listlist = tagWeightService.list(wrapper); if (CollectionUtils.isEmpty(list)) { return Maps.newHashMap(); return list.stream().collect(Collectors.toMap(TagWeigh...
private Cache cache; private ParameterMap parameterMap; private List<ResultMap> resultMaps; private boolean flushCacheRequired; private boolean useCache; private boolean resultOrdered; private SqlCommandType sqlCommandType; private KeyGenerator keyGenerator; private String[] keyProperties; private String[] keyCo...
return Maps.newHashMap(); return list.stream().collect(Collectors.toMap(TagWeight::getTagType, TagWeight::getWeight)); 4、【空值比较:(isNull、isNotNull)】 isNull(R column); // 等价于 IS NULL,例: isNull("name") ---> name is null isNotNull(R column); // 等价于 IS NOT NULL,...
mybatis-plus: map-underscore-to-camel-case: true 1. 2. 代码生成器 生成: po mapper类 xml 通用service AR controller(只生成框架) 模板引擎的模板 使用:Controller、mapper类、entity、service生成位置cn.juh.generated // 包配置 setPackageInfo(new PackageConfig() //各种dao、service、mapper类包名 .set...
在MyBatis-Plus 的 IService 接口中,this.getBaseMapper()方法是用于获取当前 Service 对应的 Mapper 对象。这个 Mapper 对象提供了对数据库表的 CRUD(创建、读取、更新、删除)操作方法,包括例如 selectPage、insert、update、delete 等。 在该代码中,this.getBaseMapper().selectPage(page, queryWrapper)表示通过当前 ...
public void selectByWrapperAllEq() { QueryWrapper<User> queryWrapper = new QueryWrapper<>(); Map<String, Object> params = new HashMap<>(); params.put("name", "小明"); params.put("age", null); **queryWrapper.allEq(params,false)**; // false代表忽略值为null的字段,即不参与where条件 Lis...
`update_time` DATETIME(0) NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间', `deleted_flag` BIGINT(0) NOT NULL DEFAULT 0 COMMENT '0:未删除 其他:已删除', PRIMARY KEY (`id`) USING BTREE, UNIQUE KEY `index_user_name_deleted_flag`(`user_name`, `deleted_flag...
return true; },Map.of(User::getId, 1, User::getName, "老王")).eq(User::getAge, null); userMapper.selectList(lambdaQueryWrapper1); ** 上述代码为参考官方示例 **//日志记录 org.example.springboot3.mybatisplus.service.UserService$$Lambda$1596/0x00000008014a60f8@290ca9d6,老王 ...