Question

我有

之类的字符串

NSMutableParagraphStyle *ParagraphStyle = [[NSMutableParagraphStyle alloc] init];
    ParagraphStyle.alignment = NSTextAlignmentJustified;
    ParagraphStyle.firstLineHeadIndent = 0.001;
    ParagraphStyle.lineSpacing = 5.0;
   NSAttributedString *attStr = [[NSAttributedString alloc] initWithString:labeltext attributes:@{NSParagraphStyleAttributeName:ParagraphStyle}];
self.labelDetails.AttributedText = attStr;

当我想按此顺序排序时：

70x100 CM
70x140 CM
70x70 CM
72x120 CM
70x130x70 CM
70x75x70 CM
72x72 CM

这是我的代码：

70x70 CM
70x75x70 CM
70x100 CM
70x130x70 CM
70x140 CM
72x72 CM
72x120 CM

有什么想法吗？

Answer 1

草莓的答案的一个小模式。这会将'cm'更改为一系列x0，以确保排序顺序总是有3个维度

SELECT *
FROM eaov
ORDER BY CAST(SUBSTRING_INDEX(REPLACE(eaov.value, ' CM', 'x0x0x0'), 'x', 1) as UNSIGNED INTEGER),
        CAST(SUBSTRING_INDEX(SUBSTRING_INDEX(REPLACE(eaov.value, ' CM', 'x0x0x0'), 'x', 2), 'x', -1) as UNSIGNED INTEGER),
        CAST(SUBSTRING_INDEX(SUBSTRING_INDEX(REPLACE(eaov.value, ' CM', 'x0x0x0'), 'x', 2), 'x', -1) as UNSIGNED INTEGER)

表现不是它的强项。

Answer 2

我并不是认真地提倡这个解决方案 - 而是作为一项临时措施（并且很容易适应规范化设计的目的）......

SELECT * FROM my_table
  ORDER 
     BY substring_index(string,'x',1) + 0 
      , substring_index(substring_index(string,'x',-1),' ',1) + 0

用字母排序数字字符串

2 个答案: