Implement MySQL framework to support consistent read views in

cursors. This should fix Bug#11813 when InnoDB part is in 
(tested with a draft patch).
The idea of the patch is that if a storage engine supports
consistent read views, we open one when open a cursor,
set is as the active view when fetch from the cursor, and close
together with cursor close.

3 files changed, 39 insertions, 30 deletions

diff --git a/sql/examples/ha_archive.cc b/sql/examples/ha_archive.cc
index e5c35ae019d..fd47b45ce52 100644
--- a/sql/examples/ha_archive.cc
+++ b/sql/examples/ha_archive.cc
@@ -140,16 +140,19 @@ static handlerton archive_hton = {
   "archive",
   0,       /* slot */
   0,       /* savepoint size. */
-  0,       /* close_connection */
-  0,       /* savepoint */
-  0,       /* rollback to savepoint */
-  0,       /* releas savepoint */
-  0,       /* commit */
-  0,       /* rollback */
-  0,       /* prepare */
-  0,       /* recover */
-  0,       /* commit_by_xid */
-  0,       /* rollback_by_xid */
+  NULL,    /* close_connection */
+  NULL,    /* savepoint */
+  NULL,    /* rollback to savepoint */
+  NULL,    /* releas savepoint */
+  NULL,    /* commit */
+  NULL,    /* rollback */
+  NULL,    /* prepare */
+  NULL,    /* recover */
+  NULL,    /* commit_by_xid */
+  NULL,    /* rollback_by_xid */
+  NULL,    /* create_cursor_read_view */
+  NULL,    /* set_cursor_read_view */
+  NULL,    /* close_cursor_read_view */
   HTON_NO_FLAGS
 };
 
diff --git a/sql/examples/ha_example.cc b/sql/examples/ha_example.cc
index 2818c176cd3..a7e193b9730 100644
--- a/sql/examples/ha_example.cc
+++ b/sql/examples/ha_example.cc
@@ -77,16 +77,19 @@ static handlerton example_hton= {
   "CSV",
   0,       /* slot */
   0,       /* savepoint size. */
-  0,       /* close_connection */
-  0,       /* savepoint */
-  0,       /* rollback to savepoint */
-  0,       /* release savepoint */
-  0,       /* commit */
-  0,       /* rollback */
-  0,       /* prepare */
-  0,       /* recover */
-  0,       /* commit_by_xid */
-  0,       /* rollback_by_xid */
+  NULL,    /* close_connection */
+  NULL,    /* savepoint */
+  NULL,    /* rollback to savepoint */
+  NULL,    /* release savepoint */
+  NULL,    /* commit */
+  NULL,    /* rollback */
+  NULL,    /* prepare */
+  NULL,    /* recover */
+  NULL,    /* commit_by_xid */
+  NULL,    /* rollback_by_xid */
+  NULL,    /* create_cursor_read_view */
+  NULL,    /* set_cursor_read_view */
+  NULL,    /* close_cursor_read_view */
   HTON_NO_FLAGS
 };
 
diff --git a/sql/examples/ha_tina.cc b/sql/examples/ha_tina.cc
index 9c774c1f75c..1e2751f3016 100644
--- a/sql/examples/ha_tina.cc
+++ b/sql/examples/ha_tina.cc
@@ -58,16 +58,19 @@ static handlerton tina_hton= {
   "CSV",
   0,       /* slot */
   0,       /* savepoint size. */
-  0,       /* close_connection */
-  0,       /* savepoint */
-  0,       /* rollback to savepoint */
-  0,       /* release savepoint */
-  0,       /* commit */
-  0,       /* rollback */
-  0,       /* prepare */
-  0,       /* recover */
-  0,       /* commit_by_xid */
-  0,       /* rollback_by_xid */
+  NULL,    /* close_connection */
+  NULL,    /* savepoint */
+  NULL,    /* rollback to savepoint */
+  NULL,    /* release savepoint */
+  NULL,    /* commit */
+  NULL,    /* rollback */
+  NULL,    /* prepare */
+  NULL,    /* recover */
+  NULL,    /* commit_by_xid */
+  NULL,    /* rollback_by_xid */
+  NULL,    /* create_cursor_read_view */
+  NULL,    /* set_cursor_read_view */
+  NULL,    /* close_cursor_read_view */
   HTON_NO_FLAGS
 };