These modifications are the result of

WL#2067 add features to mysqltest: "disable_error_abort" + "$mysql_errno"

$mysql_errno is a new builtin variable of mysqltest and contains the
return code of the last command send to the server.

"--disable_abort_on_error" switches the abort of mysqltest
after "unmasked" failing statements off.
"--enable_abort_on_error" switches the abort of mysqltest
after "unmasked" failing statements on. (default)

"Maskings" are
    !$<error number>  and  --error <error number>
in the line before the statement to be checked.

The benefit of the option "--disable_abort_on_error" is that
- all statements after the failing statement are executed
- a r/<test>.reject will be produced
- it is possible to write test cases, which perform
  code sequences depending on the return code of a single
  statement


client/mysqltest.c:
  Implementation of the features
  - "--disable_abort_on_error"/"--enable_abort_on_error" switch
  - "$mysql_errno" variable
mysql-test/r/mysqltest.result:
  test cases for the features added
mysql-test/t/mysqltest.test:
  updated results

client/mysqltest.c

@@ -243,6 +243,8 @@ VAR var_reg[10];
 HASH var_hash;
 my_bool disable_query_log=0, disable_result_log=0, disable_warnings=0;
 my_bool disable_info= 1;			/* By default off */
+/* default for disable_abort_on_error: false = abort on unmasked error */
+my_bool disable_abort_on_error= 0;
 
 struct connection cons[MAX_CONS];
 struct connection* cur_con, *next_con, *cons_end;
@@ -274,6 +276,7 @@ Q_ENABLE_WARNINGS, Q_DISABLE_WARNINGS,
 Q_ENABLE_INFO, Q_DISABLE_INFO,
 Q_ENABLE_METADATA, Q_DISABLE_METADATA,
 Q_EXEC, Q_DELIMITER,
+Q_DISABLE_ABORT_ON_ERROR, Q_ENABLE_ABORT_ON_ERROR,
 Q_DISPLAY_VERTICAL_RESULTS, Q_DISPLAY_HORIZONTAL_RESULTS,
 Q_QUERY_VERTICAL, Q_QUERY_HORIZONTAL,
 Q_START_TIMER, Q_END_TIMER,
@@ -352,6 +355,8 @@ const char *command_names[]=
   "disable_metadata",
   "exec",
   "delimiter",
+  "disable_abort_on_error",
+  "enable_abort_on_error",
   "vertical_results",
   "horizontal_results",
   "query_vertical",
@@ -1239,6 +1244,18 @@ int do_let(struct st_query* q)
   return var_set(var_name, var_name_end, var_val_start, q->end);
 }
 
+/* Store an integer (typically the returncode of the last SQL)  */
+/* statement in the mysqltest builtin variable $mysql_errno, by */
+/* simulating of a user statement "let $mysql_errno= <integer>" */
+int var_set_errno(int sql_errno )
+{
+  char var_name[] = "$mysql_errno", var_val[30];
+  sprintf(var_val, "%d", sql_errno);
+  /* On some odd systems, the return value from sprintf() isn't */
+  /* always the length of the string, so we use strlen()        */
+   return var_set(var_name, var_name + 12, var_val, var_val + strlen(var_val));
+}
+
 int do_rpl_probe(struct st_query* q __attribute__((unused)))
 {
   DBUG_ENTER("do_rpl_probe");
@@ -1996,7 +2013,7 @@ int read_query(struct st_query** q_ptr)
   memcpy((gptr) q->expected_errno, (gptr) global_expected_errno,
 	 sizeof(global_expected_errno));
   q->expected_errors= global_expected_errors;
-  q->abort_on_error= global_expected_errors == 0;
+  q->abort_on_error= (global_expected_errors == 0 && !disable_abort_on_error);
   bzero((gptr) global_expected_errno, sizeof(global_expected_errno));
   global_expected_errors=0;
   if (p[0] == '-' && p[1] == '-')
@@ -2642,6 +2659,10 @@ static int run_query_normal(MYSQL* mysql, struct st_query* q, int flags)
     dynstr_free(&ds_tmp);
   if (q->type == Q_EVAL)
     dynstr_free(&eval_query);
+  /* We save the return code (mysql_errno(mysql)) from the last call sent */
+  /* to the server into the mysqltest builtin variable $mysql_errno. This */
+  /* variable then can be used from the test case itself.                 */
+  var_set_errno(mysql_errno(mysql));
   DBUG_RETURN(error);
 }
 
@@ -3395,6 +3416,11 @@ int main(int argc, char **argv)
 
   init_var_hash(&cur_con->mysql);
 
+  /* Initialize $mysql_errno with -1, so we can                  */
+  /* - distinguish it from valid values ( >= 0 )   and           */
+  /* - detect if there was never a command sent to the server    */
+  var_set_errno(-1);
+
   while (!read_query(&q))
   {
     int current_line_inc = 1, processed = 0;
@@ -3414,6 +3440,8 @@ int main(int argc, char **argv)
       case Q_DISABLE_RPL_PARSE:  do_disable_rpl_parse(q); break;
       case Q_ENABLE_QUERY_LOG:	 disable_query_log=0; break;
       case Q_DISABLE_QUERY_LOG:  disable_query_log=1; break;
+      case Q_ENABLE_ABORT_ON_ERROR:  disable_abort_on_error=0; break;
+      case Q_DISABLE_ABORT_ON_ERROR: disable_abort_on_error=1; break;
       case Q_ENABLE_RESULT_LOG:  disable_result_log=0; break;
       case Q_DISABLE_RESULT_LOG: disable_result_log=1; break;
       case Q_ENABLE_WARNINGS:    disable_warnings=0; break;

mysql-test/r/mysqltest.result

+select -1 as "before_use_test" ;
+before_use_test
+-1
 select otto from (select 1 as otto) as t1;
 otto
 1
@@ -21,3 +24,128 @@ select friedrich from (select 1 as otto) as t1;
 ERROR 42S22: Unknown column 'friedrich' in 'field list'
 select friedrich from (select 1 as otto) as t1;
 ERROR 42S22: Unknown column 'friedrich' in 'field list'
+select otto from (select 1 as otto) as t1;
+otto
+1
+select 0 as "after_successful_stmt_errno" ;
+after_successful_stmt_errno
+0
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select 1064 as "after_wrong_syntax_errno" ;
+after_wrong_syntax_errno
+1064
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select 1064 as "after_let_var_equal_value" ;
+after_let_var_equal_value
+1064
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+set @my_var= 'abc' ;
+select 0 as "after_set_var_equal_value" ;
+after_set_var_equal_value
+0
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select 1064 as "after_disable_warnings_command" ;
+after_disable_warnings_command
+1064
+drop table if exists t1 ;
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+drop table if exists t1 ;
+select 0 as "after_disable_warnings" ;
+after_disable_warnings
+0
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select 3 from t1 ;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 1146 as "after_minus_masked" ;
+after_minus_masked
+1146
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select 3 from t1 ;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 1146 as "after_!_masked" ;
+after_!_masked
+1146
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select -1 as "after_let_errno_equal_value" ;
+after_let_errno_equal_value
+-1
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+prepare stmt from "select 3 from t1" ;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 1146 as "after_failing_prepare" ;
+after_failing_prepare
+1146
+create table t1 ( f1 char(10));
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+prepare stmt from "select 3 from t1" ;
+select 0 as "after_successful_prepare" ;
+after_successful_prepare
+0
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+execute stmt;
+3
+select 0 as "after_successful_execute" ;
+after_successful_execute
+0
+drop table t1;
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+execute stmt;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 1146 as "after_failing_execute" ;
+after_failing_execute
+1146
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+execute __stmt_;
+ERROR HY000: Unknown prepared statement handler (__stmt_) given to EXECUTE
+select 1243 as "after_failing_execute" ;
+after_failing_execute
+1243
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+deallocate prepare stmt;
+select 0 as "after_successful_deallocate" ;
+after_successful_deallocate
+0
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+deallocate prepare __stmt_;
+ERROR HY000: Unknown prepared statement handler (__stmt_) given to DEALLOCATE PREPARE
+select 1243 as "after_failing_deallocate" ;
+after_failing_deallocate
+1243
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select 1064 as "after_--disable_abort_on_error" ;
+after_--disable_abort_on_error
+1064
+select 3 from t1 ;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 3 from t1 ;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 3 from t1 ;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 1146 as "after_!errno_masked_error" ;
+after_!errno_masked_error
+1146
+garbage ;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'garbage' at line 1
+select 1064 as "after_--enable_abort_on_error" ;
+after_--enable_abort_on_error
+1064
+select 3 from t1 ;
+ERROR 42S02: Table 'test.t1' doesn't exist
+select 3 from t1 ;
+ERROR 42S02: Table 'test.t1' doesn't exist

mysql-test/t/mysqltest.test

@@ -5,6 +5,15 @@
 #
 # ============================================================================
 
+# ----------------------------------------------------------------------------
+# $mysql_errno contains the return code of the last command
+# send to the server.
+# ----------------------------------------------------------------------------
+# get $mysql_errno before the first statement
+#     $mysql_errno should be -1
+eval select $mysql_errno as "before_use_test" ;
+
+
 # ----------------------------------------------------------------------------
 # Positive case(statement)
 # ----------------------------------------------------------------------------
@@ -76,3 +85,213 @@ select friedrich from (select 1 as otto) as t1;
 #--error S00000
 #select friedrich from (select 1 as otto) as t1;
 
+
+# ----------------------------------------------------------------------------
+# test cases for $mysql_errno
+#
+# $mysql_errno is a builtin variable of mysqltest and contains the return code
+# of the last command send to the server.
+#
+#      The following test cases often initialize $mysql_errno to 1064 by 
+#      a command with wrong syntax.
+#      Example: !$1064      To prevent the abort after the error.
+#               garbage ;
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# 1. check mysql_errno = 0 after successful statement
+# ----------------------------------------------------------------------------
+select otto from (select 1 as otto) as t1;
+eval select $mysql_errno as "after_successful_stmt_errno" ;
+
+#----------------------------------------------------------------------------
+# 2. check mysql_errno = 1064 after statement with wrong syntax
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+eval select $mysql_errno as "after_wrong_syntax_errno" ;
+
+# ----------------------------------------------------------------------------
+# 3. check if let $my_var= 'abc' ; affects $mysql_errno
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+let $my_var= 'abc' ;
+eval select $mysql_errno as "after_let_var_equal_value" ;
+
+# ----------------------------------------------------------------------------
+# 4. check if set @my_var= 'abc' ; affects $mysql_errno
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+set @my_var= 'abc' ;
+eval select $mysql_errno as "after_set_var_equal_value" ;
+
+# ----------------------------------------------------------------------------
+# 5. check if the setting of --disable-warnings itself affects $mysql_errno
+#    (May be --<whatever> modifies $mysql_errno.)
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+--disable_warnings
+eval select $mysql_errno as "after_disable_warnings_command" ;
+
+# ----------------------------------------------------------------------------
+# 6. check if --disable-warnings + command with warning affects the errno
+#    stored within $mysql_errno
+#    (May be disabled warnings affect $mysql_errno.)
+# ----------------------------------------------------------------------------
+drop table if exists t1 ;
+!$1064
+garbage ;
+drop table if exists t1 ;
+eval select $mysql_errno as "after_disable_warnings" ;
+--enable_warnings
+
+# ----------------------------------------------------------------------------
+# 7. check if masked errors affect $mysql_errno
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+--error 1146
+select 3 from t1 ;
+eval select $mysql_errno as "after_minus_masked" ;
+!$1064
+garbage ;
+!$1146
+select 3 from t1 ;
+eval select $mysql_errno as "after_!_masked" ;
+
+# ----------------------------------------------------------------------------
+# 8. Will manipulations of $mysql_errno be possible and visible ?
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+let $mysql_errno= -1;
+eval select $mysql_errno as "after_let_errno_equal_value" ;
+
+# ----------------------------------------------------------------------------
+# 9. How affect actions on prepared statements $mysql_errno ?
+# ----------------------------------------------------------------------------
+# failing prepare
+!$1064
+garbage ;
+!$1146
+prepare stmt from "select 3 from t1" ;
+eval select $mysql_errno as "after_failing_prepare" ;
+create table t1 ( f1 char(10));
+
+# successful prepare
+!$1064
+garbage ;
+prepare stmt from "select 3 from t1" ;
+eval select $mysql_errno as "after_successful_prepare" ;
+
+# successful execute
+!$1064
+garbage ;
+execute stmt;
+eval select $mysql_errno as "after_successful_execute" ;
+
+# failing execute (table dropped)
+drop table t1;
+!$1064
+garbage ;
+!$1146
+execute stmt;
+eval select $mysql_errno as "after_failing_execute" ;
+
+# failing execute (unknown statement)
+!$1064
+garbage ;
+!$1243
+execute __stmt_;
+eval select $mysql_errno as "after_failing_execute" ;
+
+# successful deallocate
+!$1064
+garbage ;
+deallocate prepare stmt;
+eval select $mysql_errno as "after_successful_deallocate" ;
+
+# failing deallocate ( statement handle does not exist )
+!$1064
+garbage ;
+!$1243
+deallocate prepare __stmt_;
+eval select $mysql_errno as "after_failing_deallocate" ;
+
+
+# ----------------------------------------------------------------------------
+# test cases for "--disable_abort_on_error"
+#
+# "--disable_abort_on_error" switches the abort of mysqltest
+# after "unmasked" failing statements off.
+#
+# The default is "--enable_abort_on_error".
+#
+# "Maskings" are
+#   !$<error number>  and  --error <error number>
+# in the line before the failing statement.
+#
+# There are some additional test case for $mysql_errno
+# because "--disable_abort_on_error" enables a new situation.
+# Example: "unmasked" statement fails + analysis of $mysql_errno
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# 1. Switch the abort on error off and check the effect on $mysql_errno
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+--disable_abort_on_error
+eval select $mysql_errno as "after_--disable_abort_on_error" ;
+
+# ----------------------------------------------------------------------------
+# 2. "unmasked" failing statement should not cause an abort
+# ----------------------------------------------------------------------------
+select 3 from t1 ;
+
+# ----------------------------------------------------------------------------
+# 3. masked failing statements
+# ----------------------------------------------------------------------------
+# expected error = response
+--error 1146
+select 3 from t1 ;
+!$1146
+select 3 from t1 ;
+eval select $mysql_errno as "after_!errno_masked_error" ;
+# expected error <> response
+# --error 1000
+# select 3 from t1 ;
+# !$1000
+# select 3 from t1 ;
+
+# ----------------------------------------------------------------------------
+# 4. Switch the abort on error on and check the effect on $mysql_errno
+# ----------------------------------------------------------------------------
+!$1064
+garbage ;
+--enable_abort_on_error
+eval select $mysql_errno as "after_--enable_abort_on_error" ;
+
+# ----------------------------------------------------------------------------
+# 5. masked failing statements
+# ----------------------------------------------------------------------------
+# expected error = response
+--error 1146
+select 3 from t1 ;
+!$1146
+select 3 from t1 ;
+
+# ----------------------------------------------------------------------------
+# 6. check that the old default behaviour is not changed
+# Please remove the '#' to get the abort on error
+# ----------------------------------------------------------------------------
+#--error 1064
+#select 3 from t1 ;
+#
+#!$1064
+#select 3 from t1 ;
+#
+#select 3 from t1 ;