database - 将 postgres 表导出到 csv 错误

Question

我正在尝试将我所有的 postrgres 表导出到单独的 csv 文件中，因为我正在使用以下函数

CREATE OR REPLACE FUNCTION db_to_csv(path text)
  RETURNS void AS
$BODY$
declare
  tables RECORD;
  statement TEXT;
begin
  FOR tables IN 
    SELECT (table_schema || '.' || table_name) AS schema_table
    FROM information_schema.tables t INNER JOIN information_schema.schemata s 
    ON s.schema_name = t.table_schema 
    WHERE t.table_schema NOT IN ('pg_catalog', 'information_schema', 'configuration')
    ORDER BY schema_table
  LOOP
    statement := 'COPY ' || tables.schema_table || ' TO ''' || path || '/' || tables.schema_table || '.csv' ||''' DELIMITER '';'' CSV HEADER';
    EXECUTE statement;
  END LOOP;
  return;  
end;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION db_to_csv(text)
  OWNER TO postgres;

但是当我调用这个函数时，我无法打开文件“/home/user/Documents/public.tablename.csv”进行写入:权限被拒绝

我尝试使用

复制单个表

COPY activities TO '/home/user/Documents/foldername/conversions/tablename.csv' DELIMITER ',' CSV HEADER;

它给了我以下错误

ERROR:  could not open file "/home/user/Documents/foldername/conversions/tablename.csv" for writing: Permission denied


********** Error **********

 ERROR:  could not open file "/home/user/Documents/foldername/conversions/tablename.csv" for writing: Permission denied
SQL state: 42501

关于如何解决这个问题的任何建议。

Answer 1

创建一个每个用户都可以访问的文件夹。然后对那里的文件运行 COPY 命令。 COPY 仅适用于 postgres 用户有权访问的目录

sudo mkdir /media/export
sudo chmod 777 /media/export

COPY activities TO '/media/export/activities.csv' DELIMITER ',' CSV HEADER;