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by brian
clean slate |
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/* Copyright (C) 2000-2003, 2005 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Remove all rows from a MyISAM table */
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/* This clears the status information and truncates files */
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#include "myisamdef.h" |
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int mi_delete_all_rows(MI_INFO *info) |
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{
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uint i; |
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MYISAM_SHARE *share=info->s; |
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MI_STATE_INFO *state=&share->state; |
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DBUG_ENTER("mi_delete_all_rows"); |
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if (share->options & HA_OPTION_READ_ONLY_DATA) |
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{
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DBUG_RETURN(my_errno=EACCES); |
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}
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if (_mi_readinfo(info,F_WRLCK,1)) |
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DBUG_RETURN(my_errno); |
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if (_mi_mark_file_changed(info)) |
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goto err; |
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info->state->records=info->state->del=state->split=0; |
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state->dellink = HA_OFFSET_ERROR; |
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state->sortkey= (ushort) ~0; |
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info->state->key_file_length=share->base.keystart; |
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info->state->data_file_length=0; |
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info->state->empty=info->state->key_empty=0; |
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info->state->checksum=0; |
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for (i=share->base.max_key_block_length/MI_MIN_KEY_BLOCK_LENGTH ; i-- ; ) |
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state->key_del[i]= HA_OFFSET_ERROR; |
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for (i=0 ; i < share->base.keys ; i++) |
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state->key_root[i]= HA_OFFSET_ERROR; |
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myisam_log_command(MI_LOG_DELETE_ALL,info,(uchar*) 0,0,0); |
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/*
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If we are using delayed keys or if the user has done changes to the tables
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since it was locked then there may be key blocks in the key cache
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*/
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flush_key_blocks(share->key_cache, share->kfile, FLUSH_IGNORE_CHANGED); |
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#ifdef HAVE_MMAP
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if (share->file_map) |
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_mi_unmap_file(info); |
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#endif
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30
by Brian Aker
Large file and ftruncate() support |
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if (ftruncate(info->dfile, 0) || ftruncate(share->kfile, share->base.keystart)) |
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1
by brian
clean slate |
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goto err; |
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VOID(_mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE)); |
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#ifdef HAVE_MMAP
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/* Map again */
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if (share->file_map) |
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mi_dynmap_file(info, (my_off_t) 0); |
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#endif
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DBUG_RETURN(0); |
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err: |
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{
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int save_errno=my_errno; |
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VOID(_mi_writeinfo(info,WRITEINFO_UPDATE_KEYFILE)); |
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info->update|=HA_STATE_WRITTEN; /* Buffer changed */ |
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DBUG_RETURN(my_errno=save_errno); |
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}
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} /* mi_delete */ |