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Improve PL/Tcl errorCode facility by providing decoded name for SQLSTATE.

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We don't really want to encourage people to write numeric SQLSTATEs in
programs; that's unreadable and error-prone.  Copy plpgsql's infrastructure
for converting between SQLSTATEs and exception names shown in Appendix A,
and modify examples in tests and documentation to do it that way.
This commit is contained in:
Tom Lane
2016-03-25 16:54:52 -04:00
parent fb8d2a7f57
commit cd37bb7859
9 changed files with 118 additions and 13 deletions
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10
doc/src/sgml/pltcl.sgml
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@ -813,14 +813,16 @@ CREATE EVENT TRIGGER tcl_a_snitch ON ddl_command_start EXECUTE PROCEDURE tclsnit
word is <literal>POSTGRES</literal>, the second word is the Postgres
version number, and additional words are field name/value pairs
providing detailed information about the error.
Fields <varname>message</> and <varname>SQLSTATE</> (the error code
shown in <xref linkend="errcodes-appendix">) are always supplied.
Fields <varname>SQLSTATE</>, <varname>condition</>,
and <varname>message</> are always supplied
(the first two represent the error code and condition name as shown
in <xref linkend="errcodes-appendix">).
Fields that may be present include
<varname>detail</>, <varname>hint</>, <varname>context</>,
<varname>schema</>, <varname>table</>, <varname>column</>,
<varname>datatype</>, <varname>constraint</>,
<varname>statement</>, <varname>cursor_position</>,
<varname>filename</>, <varname>lineno</> and
<varname>filename</>, <varname>lineno</>, and
<varname>funcname</>.
</para>
@ -832,7 +834,7 @@ CREATE EVENT TRIGGER tcl_a_snitch ON ddl_command_start EXECUTE PROCEDURE tclsnit
if {[catch { spi_exec $sql_command }]} {
if {[lindex $::errorCode 0] == "POSTGRES"} {
array set errorArray $::errorCode
if {$errorArray(SQLSTATE) == "42P01"} { # UNDEFINED_TABLE
if {$errorArray(condition) == "undefined_table"} {
# deal with missing table
} else {
# deal with some other type of SQL error