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/* Copyright (C) 2003 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#if defined(__WIN__) || defined(_WIN32) || defined(_WIN64)
#include <my_global.h>
#include <m_ctype.h>
#endif
#include <myx_util_public_interface.h>
#include <myx_qb_library.h>
// needed from my_global.h, cant include it because of conflicts
#ifdef __GNUC__
typedef char pchar; /* Mixed prototypes can take char */
typedef char puchar; /* Mixed prototypes can take char */
typedef char pbool; /* Mixed prototypes can take char */
typedef short pshort; /* Mixed prototypes can take short int */
typedef float pfloat; /* Mixed prototypes can take float */
#endif
/*
* functions
*/
int myx_get_qb_public_interface_version()
{
return libmysqlqb_PUBLIC_INTERFACE_VERSION;
}
static const char *explain_fields[]= {
"id", // 0
"select_type", // 1
"table", // 2
"type", // 3
"possible_keys", // 4
"key", // 5
"key_len", // 6
"ref", // 7
"rows", // 8
"Extra" // 9
};
MYX_EXPLAIN_RESULT *myx_query_explain(MYSQL *mysql, const char *query)
{
MYX_EXPLAIN_RESULT *result= NULL;
MYSQL_RES *res;
MYSQL_ROW row;
char *tmp= g_strdup_printf("EXPLAIN %s", query);
if (myx_mysql_query(mysql, tmp) < 0)
{
g_free(tmp);
return NULL;
}
g_free(tmp);
if ((res= mysql_store_result(mysql)) != NULL)
{
unsigned int i= 0;
unsigned int num_fields = mysql_num_fields(res);
MYSQL_FIELD * fields= mysql_fetch_fields(res);
int fi[10];
build_field_subst(explain_fields,explain_fields+sizeof(explain_fields)/sizeof(char*),
fields,fields+num_fields,fi);
result= g_malloc(sizeof(MYX_EXPLAIN_RESULT));
result->rows_num= mysql_num_rows(res);
result->rows= g_malloc(sizeof(MYX_EXPLAIN_ROW)*(gulong)result->rows_num);
while ((row= mysql_fetch_row(res)) != NULL)
{
MYX_EXPLAIN_ROW *expl= result->rows+i++;
#define GET_STR_FIELD(n) fi[n]==-1 ? NULL : g_strdup(row[fi[n]]?row[fi[n]]:"")
expl->id= GET_STR_FIELD(0);
expl->select_type= GET_STR_FIELD(1);
expl->table= GET_STR_FIELD(2);
expl->join_type= GET_STR_FIELD(3);
expl->possible_keys= fi[4]>=0 && row[fi[4]] ?g_strsplit(row[fi[4]], ",", -1):NULL;
expl->possible_keys_num= 0;
if (expl->possible_keys)
while (expl->possible_keys[expl->possible_keys_num])
expl->possible_keys_num++;
expl->key= GET_STR_FIELD(5);
expl->key_len= GET_STR_FIELD(6);
expl->ref= GET_STR_FIELD(7);
expl->rows= GET_STR_FIELD(8);
expl->extra= GET_STR_FIELD(9);
#undef GET_STR_FIELD
}
}
return result;
}
int myx_free_explain_result(MYX_EXPLAIN_RESULT *res)
{
unsigned int i;
for (i= 0; i < res->rows_num; i++)
{
g_free(res->rows[i].id);
g_free(res->rows[i].select_type);
g_free(res->rows[i].table);
g_free(res->rows[i].join_type);
if (res->rows[i].possible_keys)
g_strfreev(res->rows[i].possible_keys);
g_free(res->rows[i].key);
g_free(res->rows[i].key_len);
g_free(res->rows[i].ref);
g_free(res->rows[i].rows);
g_free(res->rows[i].extra);
}
g_free(res->rows);
g_free(res);
return 0;
}
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