queryWrapper.eq("name","张三"); List<User> userList = userMapper.selectList(queryWrapper); 生成的 SQL: SELECT*FROMuserWHEREname='张三'; (2) 范围查询 查询age在 20 到 30 之间的用户: queryWrapper.between("age",20,30); List<User> userList = userMapper.selectList(queryWrapper); 生成的 SQL...
QueryWrapper<User> queryWrapper =newQueryWrapper<>(); queryWrapper.like("name","J");// 查询姓名中包含 J 的用户 List<User> users = userMapper.selectList(queryWrapper); 3.3 范围查询(between) QueryWrapper<User> queryWrapper =newQueryWrapper<>(); queryWrapper.between("age",18,30);// 查询年龄在 ...
创建一个QueryWrapper对象: QueryWrapper<User> queryWrapper = new QueryWrapper<>(); 复制代码 添加查询条件: queryWrapper.eq("name", "John"); // 添加等于条件 queryWrapper.ne("age", 25); // 添加不等于条件 queryWrapper.gt("age", 18); // 添加大于条件 queryWrapper.lt("age", 30); // 添加...
QueryWrapper<User>queryWrapper=newQueryWrapper<>(); queryWrapper.eq("name","张三"); queryWrapper.eq("age",28); queryWrapper.eq("last_name",null); // 这样也可以 // queryWrapper.eq("name", "张三").eq("age", 28).eq("last_name", null); List<User>users=userMapper.selectList(queryWrapper...
isNull 字段 为空 queryWrapper.isNull("user_name");//user_name is null isNotNull 字段 不为空 queryWrapper.isNotNull("user_name");//user_name is not null in 字段in (v0,v1,...) queryWrapper.in("user_name", {"张三","李四","王五"}); // user_name in ("张三","李四","王五"...
QueryWrapper<User>queryWrapper=newQueryWrapper<>(); queryWrapper.ne("name", "张三"); List<User>userList=userMapper.selectList(queryWrapper); AI代码助手复制代码 gt gt方法用于构建大于条件,即column > value。 QueryWrapper<User>queryWrapper=newQueryWrapper<>(); ...
// 查询男性用户QueryWrapper<User> wrapper = new QueryWrapper<>();List<String> sexList = Arrays.asList("男");wrapper.in("sex", sexList);List<User> users = userMapper.selectList(wrapper); 以上就是 MyBatis-Plus 中常见的 QueryWrapper 操作。通过灵活地调用不同方法,我们可以方便地完成各种条件查...
和mybatis-plus非常类似，除了LamdaWrapper外还提供了普通QueryWrapper的写法，改造上面的代码：public void getOrderSimple() { List<OrderDto> list = orderMapper.selectJoinList(OrderDto.class, new MPJQueryWrapper<Order>() .selectAll(Order.class) .select("t2.unit_price","t2.name as produ...
和mybatis-plus非常类似，除了LamdaWrapper外还提供了普通QueryWrapper的写法，改造上面的代码：public void ...
QueryWrapper<Train>trainQueryWrapper=newQueryWrapper<>();trainQueryWrapper.eq("company_id",users.getCompanyId()).eq("status",TrainResult.STATUS_EXIST).ge("end_time",System.currentTimeMillis());//trainList为空不报错List<Train>trainList=trainMapper.selectList(trainQueryWrapper); ...