为什么不能在多行执行 PSQL 元命令

Question

刚刚发现\COPY命令只能在一行执行，多次尝试答案的查询。这种方式对于编写长查询似乎很不友好。而且不容易找出原因。我不认为这是一个错误，那为什么。

Answer 1

从这里 psql 如果您要复制到文件：

Another way to obtain the same result as \copy ... to is to use the SQL COPY ... TO STDOUT command and terminate it with \g filename or \g |program. Unlike \copy, this method allows the command to span multiple lines; also, variable interpolation and backquote expansion can be used.

从文件中复制，借用pg_dump所做的：

CREATE TABLE csv_test (col1 integer, col2 integer);

cat csv_test.csv 

COPY 
  csv_test 
FROM 
 stdin WITH CSV;
"19","9"
"19","5"
"19","5"
"19","15"
"19","5"

\i ~/csv_test.csv 
COPY 5

select * from csv_test ;
 col1 | col2 
------+------
   19 |    9
   19 |    5
   19 |    5
   19 |   15
   19 |    5

为什么不能在多行执行 PSQL 元命令

Why PSQL meta command cannot be execute at mutliline

postgresql

psql