summaryrefslogtreecommitdiffstats
path: root/storage/myisammrg/myrg_rnext.c
diff options
context:
space:
mode:
Diffstat (limited to 'storage/myisammrg/myrg_rnext.c')
-rw-r--r--storage/myisammrg/myrg_rnext.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/storage/myisammrg/myrg_rnext.c b/storage/myisammrg/myrg_rnext.c
new file mode 100644
index 00000000..8b35e40f
--- /dev/null
+++ b/storage/myisammrg/myrg_rnext.c
@@ -0,0 +1,53 @@
+/* Copyright (c) 2000-2003, 2005-2007 MySQL AB
+ Use is subject to license terms
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#include "myrg_def.h"
+
+ /*
+ Read next row with the same key as previous read
+ */
+
+int myrg_rnext(MYRG_INFO *info, uchar *buf, int inx)
+{
+ int err;
+ MI_INFO *mi;
+
+ if (!info->current_table)
+ return (HA_ERR_KEY_NOT_FOUND);
+
+ /* at first, do rnext for the table found before */
+ if ((err=mi_rnext(info->current_table->table,NULL,inx)))
+ {
+ if (err == HA_ERR_END_OF_FILE)
+ {
+ queue_remove_top(&(info->by_key));
+ if (!info->by_key.elements)
+ return HA_ERR_END_OF_FILE;
+ }
+ else
+ return err;
+ }
+ else
+ {
+ /* Found here, adding to queue */
+ queue_top(&(info->by_key))=(uchar *)(info->current_table);
+ queue_replace_top(&(info->by_key));
+ }
+
+ /* now, mymerge's read_next is as simple as one queue_top */
+ mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
+ return _myrg_mi_read_record(mi,buf);
+}