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MDEV-7331 - information_schema.user_variables

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Sergey Vojtovich
2016-02-24 14:31:43 +04:00
parent d30ae14c24
commit 90c9641a8a
8 changed files with 243 additions and 1 deletions
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139
plugin/user_variables/user_variables.cc Normal file
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/* Copyright (C) 2016 MariaDB Foundation and Sergey Vojtovich
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#define MYSQL_SERVER
#include <sql_class.h>
#include <table.h>
#include <sql_show.h>
static const LEX_CSTRING result_types[]=
{
STRING_WITH_LEN("VARCHAR"),
STRING_WITH_LEN("DOUBLE"),
STRING_WITH_LEN("INT"),
STRING_WITH_LEN("<IMPOSSIBLE1>"), // ROW_RESULT
STRING_WITH_LEN("DECIMAL"),
STRING_WITH_LEN("<IMPOSSIBLE2>") // TIME_RESULT
};
static const LEX_CSTRING unsigned_result_types[]=
{
STRING_WITH_LEN("<IMPOSSIBLE3>"), // UNSIGNED STRING_RESULT
STRING_WITH_LEN("DOUBLE UNSIGNED"),
STRING_WITH_LEN("INT UNSIGNED"),
STRING_WITH_LEN("<IMPOSSIBLE4>"), // UNSIGNED ROW_RESULT
STRING_WITH_LEN("DECIMAL UNSIGNED"),
STRING_WITH_LEN("<IMPOSSIBLE5>") // UNSIGNED TIME_RESULT
};
static ST_FIELD_INFO user_variables_fields_info[] =
{
{ "VARIABLE_NAME", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, "Variable_name", 0 },
{ "VARIABLE_VALUE", 2048, MYSQL_TYPE_STRING, 0, MY_I_S_MAYBE_NULL, "Value", 0 },
{ "VARIABLE_TYPE", NAME_CHAR_LEN, MYSQL_TYPE_STRING, 0, 0, 0, 0 },
{ "CHARACTER_SET_NAME", MY_CS_NAME_SIZE, MYSQL_TYPE_STRING, 0,
MY_I_S_MAYBE_NULL, 0, 0 },
{ 0, 0, MYSQL_TYPE_NULL, 0, 0, 0, 0 }
};
static int user_variables_fill(THD *thd, TABLE_LIST *tables, COND *cond)
{
ulong i;
TABLE *table= tables->table;
Field **field= table->field;
String buff;
bool is_null;
for (i= 0; i < thd->user_vars.records; i++)
{
user_var_entry *var= (user_var_entry*) my_hash_element(&thd->user_vars, i);
field[0]->store(var->name.str, var->name.length, system_charset_info);
if (var->val_str(&is_null, &buff, NOT_FIXED_DEC))
{
field[1]->store(buff.ptr(), buff.length(), buff.charset());
field[1]->set_notnull();
}
else if (is_null)
field[1]->set_null();
else
return 1;
const LEX_CSTRING *tmp= var->unsigned_flag ?
&unsigned_result_types[var->type] :
&result_types[var->type];
field[2]->store(tmp->str, tmp->length, system_charset_info);
if (var->charset())
{
field[3]->store(var->charset()->csname, strlen(var->charset()->csname),
system_charset_info);
field[3]->set_notnull();
}
else
field[3]->set_null();
if (schema_table_store_record(thd, table))
return 1;
}
return 0;
}
int user_variables_reset(void)
{
THD *thd= current_thd;
if (thd)
my_hash_reset(&thd->user_vars);
return 0;
}
static int user_variables_init(void *p)
{
ST_SCHEMA_TABLE *is= (ST_SCHEMA_TABLE *) p;
is->fields_info= user_variables_fields_info;
is->fill_table= user_variables_fill;
is->reset_table= user_variables_reset;
return 0;
}
static struct st_mysql_information_schema user_variables_descriptor=
{ MYSQL_INFORMATION_SCHEMA_INTERFACE_VERSION };
maria_declare_plugin(user_variables)
{
MYSQL_INFORMATION_SCHEMA_PLUGIN,
&user_variables_descriptor,
"user_variables",
"Sergey Vojtovich",
"User-defined variables",
PLUGIN_LICENSE_GPL,
user_variables_init,
NULL,
0x0100,
NULL,
NULL,
"1.0",
MariaDB_PLUGIN_MATURITY_ALPHA
}
maria_declare_plugin_end;