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JPA getSingleResult() or null
... inserts an Entity when it doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an exception if the
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Throw away local commits in Git
Due to some bad cherry-picking, my local Git repository is currently five commits ahead of the origin, and not in a good state. I want to get rid of all these commits and start over again.
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how to convert java string to Date object [duplicate]
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Combining two Series into a DataFrame in pandas
...e (non-consecutive) indices. How do I combine s1 and s2 to being two columns in a DataFrame and keep one of the indices as a third column?
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How to convert a string to lower or upper case in Ruby
How do I take a string and convert it to lower or upper case in Ruby?
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Do I need to close() both FileReader and BufferedReader?
I'm reading a local file using a BufferedReader wrapped around a FileReader:
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常用Git命令汇总 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...了一些常用的Git命令。
常用配置
system #系统级别
--global #用户全局
--local #单独一个项目
git config --global user.name "xxxx" #用户名
git config --global user.email "xxxx@xxx.com" #邮箱
git config --global core.editor vim #编辑器
git config --global ali...
How to disable an input type=text?
I want to disable writing in an input field of type text using JavaScript, if possible.
The input field is populated from a database; that is why I don't want the user to modify its value.
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Linux command to print directory structure in the form of a tree
Is there any linux command that I can call from a Bash script that will print the directory structure in the form of a tree, e.g.,
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How do you specify a byte literal in Java?
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