postgresql - 检查 unix shell 脚本中 psql 命令的返回状态

Question

我正在使用 psql 命令连接 postgreSQL 数据库并发出查询。谁能告诉我如何在 shell 脚本中检查已执行查询的返回状态。

我已经使用 echo $? 命令来检查状态，但它总是返回零。

感谢您的帮助。

Answer 1

psql 返回码 is documented as :

EXIT STATUS
psql returns 0 to the shell if it finished normally, 1 if a fatal error of its own occurs (e.g. out of memory, file not found), 2 if the connection to the server went bad and the session was not interactive, and 3 if an error occurred in a script and the variable ON_ERROR_STOP was set.

您可能只想使用 ON_ERROR_STOP。

测试失败并报告给 shell:

$ psql -d test -v "ON_ERROR_STOP=1" <<EOF
select error;
select 'OK';
EOF

ERROR:  column "error" does not exist
LINE 1: select error;

$ echo $?
3

失败被忽略且未报告给 shell:

$ psql -d test  <<EOF
select error;
select 'OK';
EOF
ERROR:  column "error" does not exist
LINE 1: select error;
               ^
 ?column? 
----------
 OK
(1 row)

$ echo $?
0