getOne(new QueryWrapper<UserBase>().orderByDesc("create_time")) ; LOGGER.info("倒叙取值:{}",userBase1.getUserName()); Integer count = userBaseService.count() ; LOGGER.info("查询总数:{}",count); UserBase userBase2 = new UserBase() ; userBase2.setId(1); userBase2.setUserName("...
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public interface UserMapper extends BaseMapper<User> {@Results({@Result(column = "area_id", property = "areaId"),@Result(column = "area_id", property = "area",one = @One(select = "com.example.demo.mapper.AreaMapper.selectById"))})@Select("SELECT * FROM user WHERE id = #{id}")...
@Testpublic void queryWrapperOne() { QueryWrapper<User> queryWrapper = new QueryWrapper<>(); queryWrapper. isNull("name") .ge("age", 23) .isNotNull("email"); // 逻辑删除 int result = userMapper.delete(queryWrapper); System.out.println(result); // 最终的语句为:UPDATE user SET deleted=...
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这里需要注意的是使用selectOne时需要保证数据库中顶多查询出一条数据,否则就会报错nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2 ③ selectBatchIds ...
int len=strlen(one); for(int i=1;i<=len;i++) { cout.write(one,i); cout<<endl; } cout.write(one,len+8); } 注意,write()方法并不会在遇到空字符时自动停止打印字符。 进制转换(hex(),dec(),oct()) #include<bits/stdc++.h> ...
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that result will be the only item returned (not within an array). An array will still be returned if multiple results are found, however. To avoid ambiguities (in the case where it is necessary to distinguish between a result which is a failure and one which is an empty array), it is...
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