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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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11
src/bin/psql/help.c
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@ -337,7 +337,7 @@ helpVariables(unsigned short int pager)
* Windows builds currently print one more line than non-Windows builds.
* Using the larger number is fine.
*/
output = PageOutput(147, pager ? &(pset.popt.topt) : NULL);
output = PageOutput(156, pager ? &(pset.popt.topt) : NULL);
fprintf(output, _("List of specially treated variables\n\n"));
@ -360,6 +360,8 @@ helpVariables(unsigned short int pager)
" if set to \"noexec\", just show them without execution\n"));
fprintf(output, _(" ENCODING\n"
" current client character set encoding\n"));
fprintf(output, _(" ERROR\n"
" true if last query failed, else false\n"));
fprintf(output, _(" FETCH_COUNT\n"
" the number of result rows to fetch and display at a time (0 = unlimited)\n"));
fprintf(output, _(" HISTCONTROL\n"
@ -374,6 +376,9 @@ helpVariables(unsigned short int pager)
" number of EOFs needed to terminate an interactive session\n"));
fprintf(output, _(" LASTOID\n"
" value of the last affected OID\n"));
fprintf(output, _(" LAST_ERROR_MESSAGE\n"
" LAST_ERROR_SQLSTATE\n"
" message and SQLSTATE of last error, or empty string and \"00000\" if none\n"));
fprintf(output, _(" ON_ERROR_ROLLBACK\n"
" if set, an error doesn't stop a transaction (uses implicit savepoints)\n"));
fprintf(output, _(" ON_ERROR_STOP\n"
@ -388,6 +393,8 @@ helpVariables(unsigned short int pager)
" specifies the prompt used during COPY ... FROM STDIN\n"));
fprintf(output, _(" QUIET\n"
" run quietly (same as -q option)\n"));
fprintf(output, _(" ROW_COUNT\n"
" number of rows returned or affected by last query, or 0\n"));
fprintf(output, _(" SERVER_VERSION_NAME\n"
" SERVER_VERSION_NUM\n"
" server's version (in short string or numeric format)\n"));
@ -397,6 +404,8 @@ helpVariables(unsigned short int pager)
" if set, end of line terminates SQL commands (same as -S option)\n"));
fprintf(output, _(" SINGLESTEP\n"
" single-step mode (same as -s option)\n"));
fprintf(output, _(" SQLSTATE\n"
" SQLSTATE of last query, or \"00000\" if no error\n"));
fprintf(output, _(" USER\n"
" the currently connected database user\n"));
fprintf(output, _(" VERBOSITY\n"