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      src/main/java/com/njyunzhi/pet_identity/service/impl/TaCardNoServiceImpl.java

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src/main/java/com/njyunzhi/pet_identity/service/impl/TaCardNoServiceImpl.java 查看文件

@@ -85,6 +85,8 @@ public class TaCardNoServiceImpl extends ServiceImpl<TaCardNoMapper, TaCardNo> i
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     @Override
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     public String getFormatNo(String prefix, Integer num) {
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+        if (StringUtils.isEmpty(prefix) || num == null) return null;
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         int maxLen = 5;
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         return String.format("%s%s", prefix, StringUtils.lpad(num.toString(), "0", maxLen));
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     }