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Add psql variables to track success/failure of SQL queries.

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This patch adds ERROR, SQLSTATE, and ROW_COUNT, which are updated after
every query, as well as LAST_ERROR_MESSAGE and LAST_ERROR_SQLSTATE,
which are updated only when a query fails.  The expected usage of these
is for scripting.

Fabien Coelho, reviewed by Pavel Stehule

Discussion: https://postgr.es/m/alpine.DEB.2.20.1704042158020.12290@lancre
This commit is contained in:
Tom Lane
2017-09-12 19:27:48 -04:00
parent 6e7baa3227
commit 69835bc898
6 changed files with 324 additions and 1 deletions
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64
src/test/regress/sql/psql.sql
View File

@@ -606,3 +606,67 @@ UNION SELECT 5
ORDER BY 1;
\r
\p
-- tests for special result variables
-- working query, 2 rows selected
SELECT 1 AS stuff UNION SELECT 2;
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
-- syntax error
SELECT 1 UNION;
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
\echo 'last error message:' :LAST_ERROR_MESSAGE
\echo 'last error code:' :LAST_ERROR_SQLSTATE
-- empty query
;
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
-- must have kept previous values
\echo 'last error message:' :LAST_ERROR_MESSAGE
\echo 'last error code:' :LAST_ERROR_SQLSTATE
-- other query error
DROP TABLE this_table_does_not_exist;
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
\echo 'last error message:' :LAST_ERROR_MESSAGE
\echo 'last error code:' :LAST_ERROR_SQLSTATE
-- working \gdesc
SELECT 3 AS three, 4 AS four \gdesc
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
-- \gdesc with an error
SELECT 4 AS \gdesc
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
\echo 'last error message:' :LAST_ERROR_MESSAGE
\echo 'last error code:' :LAST_ERROR_SQLSTATE
-- check row count for a cursor-fetched query
\set FETCH_COUNT 10
select unique2 from tenk1 limit 19;
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
-- cursor-fetched query with an error
select 1/unique1 from tenk1;
\echo 'error:' :ERROR
\echo 'error code:' :SQLSTATE
\echo 'number of rows:' :ROW_COUNT
\echo 'last error message:' :LAST_ERROR_MESSAGE
\echo 'last error code:' :LAST_ERROR_SQLSTATE
\unset FETCH_COUNT