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如何使用数据工具更改最后一项的分隔符？

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如何使用数据工具更改最后一项的分隔符？

这是我正在努力解决的另外两个问题的后续问题：

有几件事我可以弄清楚，但我仍然在努力确定最后的分隔符并显示多个名称。

更新

通过彻底改变，datatool我能够得到它几乎完成。但在第二项之后，我还是得到了,\space不想要的东西。它对于一个条目运行顺利：

在此处输入图片描述

\NewDocumentCommand{\PIsList}{ m }{%
  \DTLforeach*{PI}{\id=ID}{%
    \expandafter\DTLifinlist\expandafter{\id}{#1}%
    {\DTLgetvalueforkey{\thePIname}{name}{PI}{ID}{\id}\thePIname\DTLiflastrow{}{,\space}}
    {}%
}}

完整的 MWE：

\documentclass{scrbook}

\usepackage{datatool,xspace}
% ===== people database setup =======
\makeatletter
\define@key{person}{name}{\DTLnewdbentry{\crcDB}{name}{#1}}
\define@key{person}{ID}{\DTLnewdbentry{\crcDB}{ID}{#1}}
\makeatother

% ===== project database setup
\makeatletter
\define@key{project}{ID}{\DTLnewdbentry{\crcDB}{ID}{#1}}
\define@key{project}{pi}{\DTLnewdbentry{\crcDB}{pi}{#1}}
\makeatother

% Load entries into databases
\NewDocumentCommand{\crcEntry}{ o m m }{%
  \def\crcDB{#2}%
  \DTLifdbexists{\crcDB}{}{\DTLnewdb{\crcDB}}%
  \DTLnewrow{\crcDB}%
  \IfNoValueTF{#1}{\setkeys{#2}{#3}}{\setkeys{#1}{#3}}%
}


\NewDocumentCommand{\PIsList}{ m }{%
  \DTLforeach*{PI}{\id=ID}{%
    \expandafter\DTLifinlist\expandafter{\id}{#1}%
    {\DTLgetvalueforkey{\thePIname}{name}{PI}{ID}{\id}\thePIname\DTLiflastrow{}{,\space}}
    {}%
}}


\NewDocumentCommand{\crcProPI}{ m }{%
   \DTLgetvalueforkey{\projectPIsList}{pi}{project}{ID}{#1}%
    \textbf{%
     #1\space%
      (\PIsList{\projectPIsList})}\xspace%
}
% in case someone misspelled the command
% this is just a fallback
\let\crcpropi\crcProPI



\begin{document}

\crcEntry[project]%<-- keyset
{project}%<-- databse
{%
  ID={A01},
  pi={person1,person2}
}
\crcEntry[project]%<-- keyset
{project}%<-- databse
{%
  ID={A02},
  pi={person3}
}

\crcEntry[person]{PI}{%
  ID = {person1},
  name={Perssonos},
}

\crcEntry[person]{PI}{%
  ID = {person2},
  name={Holgersson},
}

\crcEntry[person]{PI}{%
  ID = {person3},
  name={Ickstein},
}



\crcpropi{A01} % --> A01 (Perssonos, Holgersson)

\crcpropi{A02} % -> A02 (Ickstein)

\end{document}

答案1

看着https://tex.stackexchange.com/a/108731/98739我能够适应：

\newcommand*{\uniquePI}{}

\NewDocumentCommand{\PIsList}{ m }{%
  \DTLforeach*{PI}{\id=ID}{%
    \expandafter\DTLifinlist\expandafter{\id}{#1}%
    {\DTLgetvalueforkey{\thePIname}{name}{PI}{ID}{\id}%
    \ifdefempty{\uniquePI}%
    {\let\uniquePI\thePIname}% first element of list
    {% append to list
      \eappto\uniquePI{,\space\thePIname}%
    }}
    {}%
}\uniquePI}

在此处输入图片描述

使用-Syntax 可以获得相同的结果expl3（归功于gusbrs（参见评论）：

\ExplSyntaxOn
\NewDocumentCommand{\PIsList}{ m }
{
  \seq_clear:N \l_tmpa_seq
  \DTLforeach*{PI}{\id=ID}
  {
    \exp_args:Nx \DTLifinlist {\id}{#1}
    {
      \DTLgetvalueforkey{\thePIname}{name}{PI}{ID}{\id}
      \seq_put_left:NV \l_tmpa_seq \thePIname
    }
    {}
  }
  \seq_use:Nn \l_tmpa_seq { ,~ }
}
\ExplSyntaxOff

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