请帮我看个函数出错的问题

hmchzb19

这个函数定义如下： 我是从这一篇blog 上看来的：https://blog.interlinked.org/tutorials/postgresql.html

1. create or replace function jmember (j json, key text )
   
2. RETURNS text
   
3. LANGUAGE plv8
   
4. IMMUTABLE
   
5. AS $function$
   
6.   var ej = JSON.parse(j);
   
7.   if (typeof ej != 'object')
   
8.         return NULL;
   
9.   return JSON.stringify(ej[key]);
   
10. $function$;

复制代码

The jmember function allows us to parse and read the JSON string and returns the member identified by key:

select jmember(data, 'title') from jsontest;     jmember----------------- "right"(1 row)

Andrew also shows how to build an index to speed up access times in his post.

这个函数我不能成功执行 报错如下：

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• postgres=# select jmember(data, 'title') from jsontest;
  
• ERROR: SyntaxError: Unexpected token o
• DETAIL: undefined() LINE 0: [object Object