Implemented SP CONDITIONs and HANDLERs, with the extension of handling

MySQL error codes as well.
(No UNDO HANDLERs yet, and no SIGNAL or RESIGNAL.)
WL#850


Docs/sp-imp-spec.txt:
  Spec of CONDITIONs and HANDLERs (and updated some old stuff too).
Docs/sp-implemented.txt:
  Updated info about caching, CONDITIONs and HANDLERs.
include/mysqld_error.h:
  New error for undeclared CONDITION.
libmysqld/Makefile.am:
  New file: sp_rcontext.cc.
mysql-test/r/sp-error.result:
  New tests for CONDITIONs and HANDLERs.
mysql-test/r/sp.result:
  New tests for CONDITIONs and HANDLERs.
mysql-test/t/sp-error.test:
  New tests for CONDITIONs and HANDLERs.
mysql-test/t/sp.test:
  New tests for CONDITIONs and HANDLERs.
sql/Makefile.am:
  New file: sp_rcontext.cc.
sql/lex.h:
  New symbols for CONDITIONs, HANDLERs and CURSORs.
sql/mysqld.cc:
  Catch error if we have a handler for it.
sql/protocol.cc:
  Catch error if we have a handler for it.
sql/share/czech/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/danish/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/dutch/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/english/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/estonian/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/french/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/german/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/greek/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/hungarian/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/italian/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/japanese/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/korean/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/norwegian-ny/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/norwegian/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/polish/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/portuguese/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/romanian/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/russian/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/serbian/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/slovak/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/spanish/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/swedish/errmsg.txt:
  New error for undeclared CONDITION.
sql/share/ukrainian/errmsg.txt:
  New error for undeclared CONDITION.
sql/sp_head.cc:
  New HANDLER code.
sql/sp_head.h:
  New HANDLER code.
sql/sp_pcontext.cc:
  New CONDITION and HANDLER code.
sql/sp_pcontext.h:
  New CONDITION and HANDLER code.
sql/sp_rcontext.h:
  New CONDITION and HANDLER code.
sql/sql_yacc.yy:
  New CONDITION and HANDLER code.

1 files changed, 15 insertions, 5 deletions

diff --git a/Docs/sp-implemented.txt b/Docs/sp-implemented.txt
index 41e7c4b2923..5ce09ae3af4 100644
--- a/Docs/sp-implemented.txt
+++ b/Docs/sp-implemented.txt
@@ -1,4 +1,4 @@
-Stored Procedures implemented 2003-03-07:
+Stored Procedures implemented 2003-09-16:
 
 
 Summary of Not Yet Implemented:
@@ -7,13 +7,12 @@ Summary of Not Yet Implemented:
   - External languages
   - Access control
   - Routine characteristics (mostly used for external languages)
-  - Prepared SP caching; SPs are fetched and reparsed at each call
   - SQL-99 COMMIT (related to BEGIN/END)
   - DECLARE CURSOR ...
   - FOR-loops (as it requires cursors)
   - CASCADE/RESTRICT for ALTER and DROP
   - ALTER/DROP METHOD (as it implies User Defined Types)
-  - CONDITIONs, HANDLERs, SIGNAL and RESIGNAL (will probably not be implemented)
+  - SIGNAL and RESIGNAL, and UNDO handlers
 
 
 Summary of what's implemented:
@@ -24,7 +23,8 @@ Summary of what's implemented:
   - BEGIN/END, SET, CASE, IF, LOOP, WHILE, REPEAT, ITERATE, LEAVE
   - SELECT INTO local variables
   - "Non-query" FUNCTIONs only
-
+  - Prepared SP caching
+  - CONDITIONs and HANDLERs
 
 List of what's implemented:
 
@@ -75,7 +75,17 @@ List of what's implemented:
       query (unlike a PROCEDURE, which is called as a statement). The table
       locking scheme used makes it difficult to allow "subqueries" during
       FUNCTION invokation.
-
+    - SPs are cached, but with a separate cache for each thread (THD).
+      There are still quite a few non-reentrant constructs in the lexical
+      context which makes sharing prepared SPs impossible. And, even when
+      this is resolved, it's not necessarily the case that it will be faster
+      than a cache per thread. A global cache requires locks, which might
+      become a buttleneck. (It would save memory though.)
+    - CONDITIONs and HANDLERs are implemented, but not the SIGNAL and
+      RESIGNAL statements. (It's unclear if these can be implemented.)
+      The semantics of CONDITIONs is expanded to allow catching MySQL error
+      codes as well. UNDO handlers are not implemented (since we don't have
+      SQL-99 style transaction control yet).
 
 Closed questions: