Fix bug #3443, better foreign key error messsages.

innobase/dict/dict0dict.c:
  Add 'add_newline' parameter to dict_print_info_on_foreign_key_in_create_format.
innobase/include/dict0dict.h:
  Add 'add_newline' parameter to dict_print_info_on_foreign_key_in_create_format.
innobase/include/os0file.h:
  Add os_file_read_string.
innobase/include/trx0trx.h:
  Add trx_set_detailed_error and trx_set_detailed_error_from_file functions
  and a detailed_error field to trx_struct.
innobase/include/ut0mem.h:
  Add ut_strlcpy.
innobase/os/os0file.c:
  Add os_file_read_string.
innobase/row/row0ins.c:
  Add row_ins_set_detailed function and call it when needed.
  
  Adapt to changes in dict_print_info_on_foreign_key_in_create_format.
innobase/trx/trx0trx.c:
  Add trx_set_detailed_error and trx_set_detailed_error_from_file.
  
  Clear trx->detailed_error in trx_create.
innobase/ut/ut0mem.c:
  Add ut_strlcpy.
mysql-test/r/innodb.result:
  Add new tests, adapt existing ones whose output was changed.
mysql-test/t/innodb.test:
  Add new tests, adapt existing ones whose output was changed.
sql/ha_innodb.cc:
  Add get_error_message.
  
  Clear trx->detailed_error in start_stmt and external_lock.
sql/ha_innodb.h:
  Add get_error_message.
sql/handler.cc:
  Add special case code in print_error for HA_ERR_ROW_IS_REFERENCED and
  HA_ERR_NO_REFERENCED_ROW.
  
  Change SETMSG to point to new error messages.
sql/share/errmsg.txt:
  Add ER_ROW_IS_REFERENCED_2 and ER_NO_REFERENCED_ROW_2.

1 files changed, 16 insertions, 0 deletions

diff --git a/sql/ha_innodb.cc b/sql/ha_innodb.cc
index 9e10873ad63..d66996f8029 100644
--- a/sql/ha_innodb.cc
+++ b/sql/ha_innodb.cc
@@ -6065,6 +6065,8 @@ ha_innobase::start_stmt(
 		}
 	}
 
+	trx->detailed_error[0] = '\0';
+
 	/* Set the MySQL flag to mark that there is an active transaction */
         if (trx->active_trans == 0) {
 
@@ -6138,6 +6140,8 @@ ha_innobase::external_lock(
 	if (lock_type != F_UNLCK) {
 		/* MySQL is setting a new table lock */
 
+		trx->detailed_error[0] = '\0';
+		
 		/* Set the MySQL flag to mark that there is an active
 		transaction */
                 if (trx->active_trans == 0) {
@@ -6941,6 +6945,18 @@ ha_innobase::reset_auto_increment(ulonglong value)
 	DBUG_RETURN(0);
 }
 
+/* See comment in handler.cc */
+bool
+ha_innobase::get_error_message(int error, String *buf)
+{
+	trx_t*	    trx = check_trx_exists(current_thd);
+
+	buf->copy(trx->detailed_error, strlen(trx->detailed_error),
+		system_charset_info);
+
+	return FALSE;
+}
+
 /***********************************************************************
 Compares two 'refs'. A 'ref' is the (internal) primary key value of the row.
 If there is no explicitly declared non-null unique key or a primary key, then