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crebas.cpp
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C/C++ Source or Header
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1999-01-13
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7KB
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218 lines
/* Copyright (C) 1979-1996 TcX AB & Monty Program KB & Detron HB
This software is distributed with NO WARRANTY OF ANY KIND. No author or
distributor accepts any responsibility for the consequences of using it, or
for whether it serves any particular purpose or works at all, unless he or
she says so in writing. Refer to the Free Public License (the "License")
for full details.
Every copy of this file must include a copy of the License, normally in a
plain ASCII text file named PUBLIC. The License grants you the right to
copy, modify and redistribute this file, but only under certain conditions
described in the License. Among other things, the License requires that
the copyright notice and this notice be preserved on all copies. */
/* Makes a database from a form-file */
#include "mysql_priv.h"
#ifndef NO_HASH
#include <hashdb.h>
#endif
#include <heap.h>
#include <nisam.h>
#include <merge.h>
/* Functions in this file */
#ifndef NO_HASH
static int NEAR_F cre_hash(char *name,TABLE *form);
#endif
static int NEAR_F cre_isam(char *name,TABLE *form,uint options);
/* Initiates form-file and calls apropriate database-creator */
/* Returns 1 if something got wrong */
int cre_database(my_string name)
{
int error;
TABLE form;
DBUG_ENTER("cre_database");
error=0; // Keep lint happy
if (openfrm(name,"",0,(uint) (READ_ALL+GET_NAME_OF_INDEXFILE),&form))
DBUG_RETURN(1);
switch (form.db_type)
{
#ifndef NO_HASH
case DB_TYPE_HASH: error=cre_hash(name,&form); break;
#endif
#ifndef NO_HEAP
case DB_TYPE_HEAP:
{ /* Remove old database */
char buff[FN_REFLEN];
error=heap_create(fn_format(buff,name,"","",1+2));
break;
}
#endif
case DB_TYPE_ISAM:
error=cre_isam(name,&form, form.db_create_options);
break;
case DB_TYPE_MRG_ISAM:
#ifndef NO_MERGE
{
char buff[FN_REFLEN];
error=mrg_create(fn_format(buff,name,"","",2+4+16),0);
break;
}
#endif
default: break; /* impossible */
}
VOID(closefrm(&form));
if (error)
my_error(ER_CANT_CREATE_TABLE,MYF(ME_BELL+ME_WAITTANG),name,my_errno);
DBUG_RETURN(error != 0);
} /* cre_database */
/* makes a hash-database */
#ifndef NO_HASH
static int NEAR_F cre_hash(my_string name, register TABLE *form)
{
register uint i,j;
char buff[FN_REFLEN];
KEY *pos;
H_KEYDEF keydef[MAX_KEY];
DBUG_ENTER("cre_hash");
pos=form->key_info;
for (i=0; i < form->keys ; i++, pos++)
{
keydef[i].hk_flag= pos->dupp_key ? 0 : HA_NOSAME;
for (j=0 ; (int7) j < pos->key_parts ; j++)
{
uint flag=pos->key_part[j].key_type;
if (!f_is_packed(flag) && f_packtype(flag) == (int) FIELD_TYPE_DECIMAL &&
!(flag & FIELDFLAG_BINARY))
keydef[i].hk_keyseg[j].key_type= (int) HA_KEYTYPE_TEXT;
else
keydef[i].hk_keyseg[j].key_type= (int) HA_KEYTYPE_BINARY;
keydef[i].hk_keyseg[j].start= pos->key_part[j].offset;
keydef[i].hk_keyseg[j].length= pos->key_part[j].length;
}
keydef[i].hk_keyseg[j].key_type= 0;
}
DBUG_RETURN(h_create(fn_format(buff,name,"","",2+4+16),i,
keydef,form->reclength,form->max_records,form->reloc,
0));
} /* cre_hash */
#endif
/* makes a new-isam-database */
static int NEAR_F cre_isam(my_string name, register TABLE *form, uint options)
{
int error;
uint i,j,recpos,minpos,fieldpos,temp_length,length;
enum ha_base_keytype type;
char buff[FN_REFLEN];
KEY *pos;
N_KEYDEF keydef[MAX_KEY];
N_RECINFO *recinfo,*recinfo_pos;
DBUG_ENTER("cre_isam");
type=HA_KEYTYPE_BINARY; // Keep compiler happy
if (!(recinfo= (N_RECINFO*) my_malloc((form->fields*2+3)*sizeof(N_RECINFO),
MYF(MY_WME))))
DBUG_RETURN(1);
pos=form->key_info;
for (i=0; i < form->keys ; i++, pos++)
{
keydef[i].base.flag= (pos->dupp_key ? 0 : HA_NOSAME);
for (j=0 ; (int7) j < pos->key_parts ; j++)
{
keydef[i].seg[j].base.flag=pos->key_part[j].key_part_flag;
Field *field=pos->key_part[j].field;
type=field->key_type();
if ((options & HA_OPTION_PACK_KEYS) && pos->key_part[j].length > 8 &&
(type == HA_KEYTYPE_TEXT ||
type == HA_KEYTYPE_NUM ||
(type == HA_KEYTYPE_BINARY && !field->zero_pack())))
{
if (j == 0)
keydef[i].base.flag|=HA_PACK_KEY;
if (!(field->flags & ZEROFILL_FLAG) &&
(field->type() == FIELD_TYPE_STRING ||
field->type() == FIELD_TYPE_VAR_STRING ||
(pos->key_part[j].length - ((Field_num*) field)->decimals)
>= 4))
keydef[i].seg[j].base.flag|=HA_SPACE_PACK;
}
keydef[i].seg[j].base.type=(int) type;
keydef[i].seg[j].base.start= pos->key_part[j].offset;
keydef[i].seg[j].base.length= pos->key_part[j].length;
}
keydef[i].seg[j].base.type=(int) HA_KEYTYPE_END; /* End of key-parts */
}
recpos=0; recinfo_pos=recinfo;
while (recpos < (uint) form->reclength)
{
Field **field,*found=0;
minpos=form->reclength; length=0;
for (field=form->field ; *field ; field++)
{
if ((fieldpos=(*field)->offset()) >= recpos &&
fieldpos <= minpos)
{
if (!(temp_length= (*field)->pack_length()))
continue; /* Skipp null-fields */
if (! found || fieldpos < minpos ||
(fieldpos == minpos && temp_length < length))
{
minpos=fieldpos; found= *field; length=temp_length;
}
}
}
DBUG_PRINT("loop",("found: %lx recpos: %d minpos: %d length: %d",
found,recpos,minpos,length));
if (recpos != minpos)
{ // Not used space
recinfo_pos->base.type=(int) FIELD_NORMAL;
recinfo_pos++->base.length= (uint16) (minpos-recpos);
}
if (! found)
break;
if (found->flags & BLOB_FLAG)
recinfo_pos->base.type= (int) FIELD_BLOB;
else if (!(options & HA_OPTION_PACK_RECORD))
recinfo_pos->base.type= (int) FIELD_NORMAL;
else if (found->zero_pack())
recinfo_pos->base.type= (int) FIELD_SKIPP_ZERO;
else
recinfo_pos->base.type= (int) ((length <= 3 ||
(found->flags & ZEROFILL_FLAG)) ?
FIELD_NORMAL :
found->type() == FIELD_TYPE_STRING ||
found->type() == FIELD_TYPE_VAR_STRING ?
FIELD_SKIPP_ENDSPACE :
FIELD_SKIPP_PRESPACE);
recinfo_pos++ ->base.length=(uint16) length;
recpos=minpos+length;
DBUG_PRINT("loop",("length: %d type: %d",
recinfo_pos[-1].base.length,recinfo_pos[-1].base.type));
}
recinfo_pos->base.type= (int) FIELD_LAST; /* End of fieldinfo */
error=ni_create(fn_format(buff,name,"","",2+4+16),form->keys,keydef,
recinfo,form->max_records,form->reloc,0,0,0L);
my_free((gptr) recinfo,MYF(0));
DBUG_RETURN(error);
}