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ha_connect.cc
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ha_connect.cc
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/* Copyright (C) Olivier Bertrand 2004 - 2017
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 02111-1301 USA */
/**
@file ha_connect.cc
@brief
The ha_connect engine is a stubbed storage engine that enables to create tables
based on external data. Principally they are based on plain files of many
different types, but also on collections of such files, collection of tables,
local or remote MySQL/MariaDB tables retrieved via MySQL API,
ODBC/JDBC tables retrieving data from other DBMS having an ODBC/JDBC server,
and even virtual tables.
@details
ha_connect will let you create/open/delete tables, the created table can be
done specifying an already existing file, the drop table command will just
suppress the table definition but not the eventual data file.
Indexes are not supported for all table types but data can be inserted,
updated or deleted.
You can enable the CONNECT storage engine in your build by doing the
following during your build process:<br> ./configure
--with-connect-storage-engine
You can install the CONNECT handler as all other storage handlers.
Once this is done, MySQL will let you create tables with:<br>
CREATE TABLE <table name> (...) ENGINE=CONNECT;
The example storage engine does not use table locks. It
implements an example "SHARE" that is inserted into a hash by table
name. This is not used yet.
Please read the object definition in ha_connect.h before reading the rest
of this file.
@note
This MariaDB CONNECT handler is currently an adaptation of the XDB handler
that was written for MySQL version 4.1.2-alpha. Its overall design should
be enhanced in the future to meet MariaDB requirements.
@note
It was written also from the Brian's ha_example handler and contains parts
of it that are there, such as table and system variables.
@note
When you create an CONNECT table, the MySQL Server creates a table .frm
(format) file in the database directory, using the table name as the file
name as is customary with MySQL.
For file based tables, if a file name is not specified, this is an inward
table. An empty file is made in the current data directory that you can
populate later like for other engine tables. This file modified on ALTER
and is deleted when dropping the table.
If a file name is specified, this in an outward table. The specified file
will be used as representing the table data and will not be modified or
deleted on command such as ALTER or DROP.
To get an idea of what occurs, here is an example select that would do
a scan of an entire table:
@code
ha-connect::open
ha_connect::store_lock
ha_connect::external_lock
ha_connect::info
ha_connect::rnd_init
ha_connect::extra
ENUM HA_EXTRA_CACHE Cache record in HA_rrnd()
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::rnd_next
ha_connect::extra
ENUM HA_EXTRA_NO_CACHE End caching of records (def)
ha_connect::external_lock
ha_connect::extra
ENUM HA_EXTRA_RESET Reset database to after open
@endcode
Here you see that the connect storage engine has 9 rows called before
rnd_next signals that it has reached the end of its data. Calls to
ha_connect::extra() are hints as to what will be occuring to the request.
Happy use!<br>
-Olivier
*/
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#define MYSQL_SERVER 1
#define DONT_DEFINE_VOID
#include "sql_class.h"
#include "create_options.h"
#include "mysql_com.h"
#include "field.h"
#include "sql_parse.h"
#include "sql_base.h"
#include <sys/stat.h>
#include "sql_partition.h"
#undef OFFSET
#define NOPARSE
#define NJDBC
#if defined(UNIX)
#include "osutil.h"
#endif // UNIX
#include "global.h"
#include "plgdbsem.h"
#include "xtable.h"
#include "tabext.h"
#if defined(ODBC_SUPPORT)
#include "odbccat.h"
#endif // ODBC_SUPPORT
#if defined(JDBC_SUPPORT)
#include "tabjdbc.h"
#include "jdbconn.h"
#endif // JDBC_SUPPORT
#include "tabmysql.h"
#include "filamdbf.h"
#include "tabxcl.h"
#include "tabfmt.h"
//#include "reldef.h"
#include "tabcol.h"
#include "xindex.h"
#if defined(__WIN__)
#include <io.h>
#include "tabwmi.h"
#endif // __WIN__
#include "connect.h"
#include "user_connect.h"
#include "ha_connect.h"
#include "myutil.h"
#include "preparse.h"
#include "inihandl.h"
#if defined(LIBXML2_SUPPORT)
#include "libdoc.h"
#endif // LIBXML2_SUPPORT
#include "taboccur.h"
#include "tabpivot.h"
#include "tabfix.h"
#define my_strupr(p) my_caseup_str(default_charset_info, (p));
#define my_strlwr(p) my_casedn_str(default_charset_info, (p));
#define my_stricmp(a,b) my_strcasecmp(default_charset_info, (a), (b))
/***********************************************************************/
/* Initialize the ha_connect static members. */
/***********************************************************************/
#define SZCONV 8192
#define SZWORK 67108864 // Default work area size 64M
#define SZWMIN 4194304 // Minimum work area size 4M
#define JSONMAX 10 // JSON Default max grp size
extern "C" {
char version[]= "Version 1.06.0001 April 17, 2017";
#if defined(__WIN__)
char compver[]= "Version 1.06.0001 " __DATE__ " " __TIME__;
char slash= '\\';
#else // !__WIN__
char slash= '/';
#endif // !__WIN__
} // extern "C"
#if defined(XMAP)
my_bool xmap= false;
#endif // XMAP
ulong ha_connect::num= 0;
#if defined(XMSG)
extern "C" {
char *msg_path;
} // extern "C"
#endif // XMSG
#if defined(JDBC_SUPPORT)
char *JvmPath;
char *ClassPath;
#endif // JDBC_SUPPORT
#if defined(__WIN__)
CRITICAL_SECTION parsec; // Used calling the Flex parser
#else // !__WIN__
pthread_mutex_t parmut = PTHREAD_MUTEX_INITIALIZER;
#endif // !__WIN__
/***********************************************************************/
/* Utility functions. */
/***********************************************************************/
PQRYRES OEMColumns(PGLOBAL g, PTOS topt, char *tab, char *db, bool info);
PQRYRES VirColumns(PGLOBAL g, bool info);
PQRYRES JSONColumns(PGLOBAL g, char *db, PTOS topt, bool info);
PQRYRES XMLColumns(PGLOBAL g, char *db, char *tab, PTOS topt, bool info);
int TranslateJDBCType(int stp, char *tn, int prec, int& len, char& v);
void PushWarning(PGLOBAL g, THD *thd, int level);
bool CheckSelf(PGLOBAL g, TABLE_SHARE *s, PCSZ host, PCSZ db,
PCSZ tab, PCSZ src, int port);
bool ZipLoadFile(PGLOBAL, PCSZ, PCSZ, PCSZ, bool, bool);
bool ExactInfo(void);
void mongo_init(bool);
USETEMP UseTemp(void);
int GetConvSize(void);
TYPCONV GetTypeConv(void);
uint GetJsonGrpSize(void);
char *GetJavaWrapper(void);
uint GetWorkSize(void);
void SetWorkSize(uint);
extern "C" const char *msglang(void);
static void PopUser(PCONNECT xp);
static PCONNECT GetUser(THD *thd, PCONNECT xp);
static PGLOBAL GetPlug(THD *thd, PCONNECT& lxp);
static handler *connect_create_handler(handlerton *hton,
TABLE_SHARE *table,
MEM_ROOT *mem_root);
static int connect_assisted_discovery(handlerton *hton, THD* thd,
TABLE_SHARE *table_s,
HA_CREATE_INFO *info);
/****************************************************************************/
/* Return str as a zero terminated string. */
/****************************************************************************/
static char *strz(PGLOBAL g, LEX_STRING &ls)
{
char *str= (char*)PlugSubAlloc(g, NULL, ls.length + 1);
memcpy(str, ls.str, ls.length);
str[ls.length]= 0;
return str;
} // end of strz
/***********************************************************************/
/* CONNECT session variables definitions. */
/***********************************************************************/
// Tracing: 0 no, 1 yes, >1 more tracing
static MYSQL_THDVAR_INT(xtrace,
PLUGIN_VAR_RQCMDARG, "Console trace value.",
NULL, NULL, 0, 0, INT_MAX, 1);
// Getting exact info values
static MYSQL_THDVAR_BOOL(exact_info, PLUGIN_VAR_RQCMDARG,
"Getting exact info values",
NULL, NULL, 0);
/**
Temporary file usage:
no: Not using temporary file
auto: Using temporary file when needed
yes: Allways using temporary file
force: Force using temporary file (no MAP)
test: Reserved
*/
const char *usetemp_names[]=
{
"NO", "AUTO", "YES", "FORCE", "TEST", NullS
};
TYPELIB usetemp_typelib=
{
array_elements(usetemp_names) - 1, "usetemp_typelib",
usetemp_names, NULL
};
static MYSQL_THDVAR_ENUM(
use_tempfile, // name
PLUGIN_VAR_RQCMDARG, // opt
"Temporary file use.", // comment
NULL, // check
NULL, // update function
1, // def (AUTO)
&usetemp_typelib); // typelib
// Size used for g->Sarea_Size
static MYSQL_THDVAR_UINT(work_size,
PLUGIN_VAR_RQCMDARG,
"Size of the CONNECT work area.",
NULL, NULL, SZWORK, SZWMIN, UINT_MAX, 1);
// Size used when converting TEXT columns to VARCHAR
static MYSQL_THDVAR_INT(conv_size,
PLUGIN_VAR_RQCMDARG, // opt
"Size used when converting TEXT columns.",
NULL, NULL, SZCONV, 0, 65500, 1);
/**
Type conversion:
no: Unsupported types -> TYPE_ERROR
yes: TEXT -> VARCHAR
skip: skip unsupported type columns in Discovery
*/
const char *xconv_names[]=
{
"NO", "YES", "SKIP", NullS
};
TYPELIB xconv_typelib=
{
array_elements(xconv_names) - 1, "xconv_typelib",
xconv_names, NULL
};
static MYSQL_THDVAR_ENUM(
type_conv, // name
PLUGIN_VAR_RQCMDARG, // opt
"Unsupported types conversion.", // comment
NULL, // check
NULL, // update function
0, // def (no)
&xconv_typelib); // typelib
// Estimate max number of rows for JSON aggregate functions
static MYSQL_THDVAR_UINT(json_grp_size,
PLUGIN_VAR_RQCMDARG, // opt
"max number of rows for JSON aggregate functions.",
NULL, NULL, JSONMAX, 1, INT_MAX, 1);
#if defined(JDBC_SUPPORT)
// Default java wrapper to use with JDBC tables
static MYSQL_THDVAR_STR(java_wrapper,
PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_MEMALLOC,
"Java wrapper class name",
// check_class_path, update_class_path,
NULL, NULL, "wrappers/JdbcInterface");
#endif // JDBC_SUPPORT
#if defined(XMSG) || defined(NEWMSG)
const char *language_names[]=
{
"default", "english", "french", NullS
};
TYPELIB language_typelib=
{
array_elements(language_names) - 1, "language_typelib",
language_names, NULL
};
static MYSQL_THDVAR_ENUM(
msg_lang, // name
PLUGIN_VAR_RQCMDARG, // opt
"Message language", // comment
NULL, // check
NULL, // update
1, // def (ENGLISH)
&language_typelib); // typelib
#endif // XMSG || NEWMSG
/***********************************************************************/
/* The CONNECT handlerton object. */
/***********************************************************************/
handlerton *connect_hton= NULL;
/***********************************************************************/
/* Function to export session variable values to other source files. */
/***********************************************************************/
extern "C" int GetTraceValue(void)
{return connect_hton ? THDVAR(current_thd, xtrace) : 0;}
bool ExactInfo(void) {return THDVAR(current_thd, exact_info);}
USETEMP UseTemp(void) {return (USETEMP)THDVAR(current_thd, use_tempfile);}
int GetConvSize(void) {return THDVAR(current_thd, conv_size);}
TYPCONV GetTypeConv(void) {return (TYPCONV)THDVAR(current_thd, type_conv);}
uint GetJsonGrpSize(void)
{return connect_hton ? THDVAR(current_thd, json_grp_size) : 10;}
uint GetWorkSize(void) {return THDVAR(current_thd, work_size);}
void SetWorkSize(uint)
{
// Changing the session variable value seems to be impossible here
// and should be done in a check function
push_warning(current_thd, Sql_condition::WARN_LEVEL_WARN, 0,
"Work size too big, try setting a smaller value");
} // end of SetWorkSize
#if defined(XMSG) || defined(NEWMSG)
extern "C" const char *msglang(void)
{
return language_names[THDVAR(current_thd, msg_lang)];
} // end of msglang
#else // !XMSG && !NEWMSG
#if defined(JDBC_SUPPORT)
char *GetJavaWrapper(void)
{return connect_hton ? THDVAR(current_thd, java_wrapper) : (char*)"wrappers/JdbcInterface";}
#endif // JDBC_SUPPORT
extern "C" const char *msglang(void)
{
#if defined(FRENCH)
return "french";
#else // DEFAULT
return "english";
#endif // DEFAULT
} // end of msglang
#endif // !XMSG && !NEWMSG
#if 0
/***********************************************************************/
/* Global variables update functions. */
/***********************************************************************/
static void update_connect_zconv(MYSQL_THD thd,
struct st_mysql_sys_var *var,
void *var_ptr, const void *save)
{
zconv= *(int *)var_ptr= *(int *)save;
} // end of update_connect_zconv
static void update_connect_xconv(MYSQL_THD thd,
struct st_mysql_sys_var *var,
void *var_ptr, const void *save)
{
xconv= (int)(*(ulong *)var_ptr= *(ulong *)save);
} // end of update_connect_xconv
#if defined(XMAP)
static void update_connect_xmap(MYSQL_THD thd,
struct st_mysql_sys_var *var,
void *var_ptr, const void *save)
{
xmap= (my_bool)(*(my_bool *)var_ptr= *(my_bool *)save);
} // end of update_connect_xmap
#endif // XMAP
#endif // 0
#if 0 // (was XMSG) Unuseful because not called for default value
static void update_msg_path(MYSQL_THD thd,
struct st_mysql_sys_var *var,
void *var_ptr, const void *save)
{
char *value= *(char**)save;
char *old= *(char**)var_ptr;
if (value)
*(char**)var_ptr= my_strdup(value, MYF(0));
else
*(char**)var_ptr= 0;
my_free(old);
} // end of update_msg_path
static int check_msg_path (MYSQL_THD thd, struct st_mysql_sys_var *var,
void *save, struct st_mysql_value *value)
{
const char *path;
char buff[512];
int len= sizeof(buff);
path= value->val_str(value, buff, &len);
if (path && *path != '*') {
/* Save a pointer to the name in the
'file_format_name_map' constant array. */
*(char**)save= my_strdup(path, MYF(0));
return(0);
} else {
push_warning_printf(thd,
Sql_condition::WARN_LEVEL_WARN,
ER_WRONG_ARGUMENTS,
"CONNECT: invalid message path");
} // endif path
*(char**)save= NULL;
return(1);
} // end of check_msg_path
#endif // 0
/**
CREATE TABLE option list (table options)
These can be specified in the CREATE TABLE:
CREATE TABLE ( ... ) {...here...}
*/
ha_create_table_option connect_table_option_list[]=
{
HA_TOPTION_STRING("TABLE_TYPE", type),
HA_TOPTION_STRING("FILE_NAME", filename),
HA_TOPTION_STRING("XFILE_NAME", optname),
//HA_TOPTION_STRING("CONNECT_STRING", connect),
HA_TOPTION_STRING("TABNAME", tabname),
HA_TOPTION_STRING("TABLE_LIST", tablist),
HA_TOPTION_STRING("DBNAME", dbname),
HA_TOPTION_STRING("SEP_CHAR", separator),
HA_TOPTION_STRING("QCHAR", qchar),
HA_TOPTION_STRING("MODULE", module),
HA_TOPTION_STRING("SUBTYPE", subtype),
HA_TOPTION_STRING("CATFUNC", catfunc),
HA_TOPTION_STRING("SRCDEF", srcdef),
HA_TOPTION_STRING("COLIST", colist),
HA_TOPTION_STRING("OPTION_LIST", oplist),
HA_TOPTION_STRING("DATA_CHARSET", data_charset),
HA_TOPTION_NUMBER("LRECL", lrecl, 0, 0, INT_MAX32, 1),
HA_TOPTION_NUMBER("BLOCK_SIZE", elements, 0, 0, INT_MAX32, 1),
//HA_TOPTION_NUMBER("ESTIMATE", estimate, 0, 0, INT_MAX32, 1),
HA_TOPTION_NUMBER("MULTIPLE", multiple, 0, 0, 3, 1),
HA_TOPTION_NUMBER("HEADER", header, 0, 0, 3, 1),
HA_TOPTION_NUMBER("QUOTED", quoted, (ulonglong) -1, 0, 3, 1),
HA_TOPTION_NUMBER("ENDING", ending, (ulonglong) -1, 0, INT_MAX32, 1),
HA_TOPTION_NUMBER("COMPRESS", compressed, 0, 0, 2, 1),
HA_TOPTION_BOOL("MAPPED", mapped, 0),
HA_TOPTION_BOOL("HUGE", huge, 0),
HA_TOPTION_BOOL("SPLIT", split, 0),
HA_TOPTION_BOOL("READONLY", readonly, 0),
HA_TOPTION_BOOL("SEPINDEX", sepindex, 0),
HA_TOPTION_BOOL("ZIPPED", zipped, 0),
HA_TOPTION_END
};
/**
CREATE TABLE option list (field options)
These can be specified in the CREATE TABLE per field:
CREATE TABLE ( field ... {...here...}, ... )
*/
ha_create_table_option connect_field_option_list[]=
{
HA_FOPTION_NUMBER("FLAG", offset, (ulonglong) -1, 0, INT_MAX32, 1),
HA_FOPTION_NUMBER("MAX_DIST", freq, 0, 0, INT_MAX32, 1), // BLK_INDX
HA_FOPTION_NUMBER("FIELD_LENGTH", fldlen, 0, 0, INT_MAX32, 1),
HA_FOPTION_STRING("DATE_FORMAT", dateformat),
HA_FOPTION_STRING("FIELD_FORMAT", fieldformat),
HA_FOPTION_STRING("SPECIAL", special),
HA_FOPTION_ENUM("DISTRIB", opt, "scattered,clustered,sorted", 0),
HA_FOPTION_END
};
/*
CREATE TABLE option list (index options)
These can be specified in the CREATE TABLE per index:
CREATE TABLE ( field ..., .., INDEX .... *here*, ... )
*/
ha_create_table_option connect_index_option_list[]=
{
HA_IOPTION_BOOL("DYNAM", dynamic, 0),
HA_IOPTION_BOOL("MAPPED", mapped, 0),
HA_IOPTION_END
};
/***********************************************************************/
/* Push G->Message as a MySQL warning. */
/***********************************************************************/
bool PushWarning(PGLOBAL g, PTDB tdbp, int level)
{
PHC phc;
THD *thd;
MYCAT *cat= (MYCAT*)tdbp->GetDef()->GetCat();
if (!cat || !(phc= cat->GetHandler()) || !phc->GetTable() ||
!(thd= (phc->GetTable())->in_use))
return true;
PushWarning(g, thd, level);
return false;
} // end of PushWarning
void PushWarning(PGLOBAL g, THD *thd, int level)
{
if (thd) {
Sql_condition::enum_warning_level wlvl;
wlvl= (Sql_condition::enum_warning_level)level;
push_warning(thd, wlvl, 0, g->Message);
} else
htrc("%s\n", g->Message);
} // end of PushWarning
#ifdef HAVE_PSI_INTERFACE
static PSI_mutex_key con_key_mutex_CONNECT_SHARE_mutex;
static PSI_mutex_info all_connect_mutexes[]=
{
{ &con_key_mutex_CONNECT_SHARE_mutex, "CONNECT_SHARE::mutex", 0}
};
static void init_connect_psi_keys()
{
const char* category= "connect";
int count;
if (PSI_server == NULL)
return;
count= array_elements(all_connect_mutexes);
PSI_server->register_mutex(category, all_connect_mutexes, count);
}
#else
static void init_connect_psi_keys() {}
#endif
DllExport LPCSTR PlugSetPath(LPSTR to, LPCSTR name, LPCSTR dir)
{
const char *res= PlugSetPath(to, mysql_data_home, name, dir);
return res;
}
/**
@brief
If frm_error() is called then we will use this to determine
the file extensions that exist for the storage engine. This is also
used by the default rename_table and delete_table method in
handler.cc.
For engines that have two file name extentions (separate meta/index file
and data file), the order of elements is relevant. First element of engine
file name extentions array should be meta/index file extention. Second
element - data file extention. This order is assumed by
prepare_for_repair() when REPAIR TABLE ... USE_FRM is issued.
@see
rename_table method in handler.cc and
delete_table method in handler.cc
*/
static const char *ha_connect_exts[]= {
".dos", ".fix", ".csv", ".bin", ".fmt", ".dbf", ".xml", ".json", ".ini",
".vec", ".dnx", ".fnx", ".bnx", ".vnx", ".dbx", ".dop", ".fop", ".bop",
".vop", NULL};
/**
@brief
Plugin initialization
*/
static int connect_init_func(void *p)
{
DBUG_ENTER("connect_init_func");
// added from Sergei mail
#if 0 // (defined(LINUX))
Dl_info dl_info;
if (dladdr(&connect_hton, &dl_info))
{
if (dlopen(dl_info.dli_fname, RTLD_NOLOAD | RTLD_NOW | RTLD_GLOBAL) == 0)
{
sql_print_information("CONNECT: dlopen() failed, OEM table type is not supported");
sql_print_information("CONNECT: %s", dlerror());
}
}
else
{
sql_print_information("CONNECT: dladdr() failed, OEM table type is not supported");
sql_print_information("CONNECT: %s", dlerror());
}
#endif // 0 (LINUX)
#if defined(__WIN__)
sql_print_information("CONNECT: %s", compver);
InitializeCriticalSection((LPCRITICAL_SECTION)&parsec);
#else // !__WIN__
sql_print_information("CONNECT: %s", version);
#endif // !__WIN__
#if defined(LIBXML2_SUPPORT)
XmlInitParserLib();
#endif // LIBXML2_SUPPORT
init_connect_psi_keys();
connect_hton= (handlerton *)p;
connect_hton->state= SHOW_OPTION_YES;
connect_hton->create= connect_create_handler;
connect_hton->flags= HTON_TEMPORARY_NOT_SUPPORTED;
connect_hton->table_options= connect_table_option_list;
connect_hton->field_options= connect_field_option_list;
connect_hton->index_options= connect_index_option_list;
connect_hton->tablefile_extensions= ha_connect_exts;
connect_hton->discover_table_structure= connect_assisted_discovery;
if (trace)
sql_print_information("connect_init: hton=%p", p);
DTVAL::SetTimeShift(); // Initialize time zone shift once for all
BINCOL::SetEndian(); // Initialize host endian setting
#if defined(JDBC_SUPPORT)
JDBConn::SetJVM();
#endif // JDBC_SUPPORT
DBUG_RETURN(0);
} // end of connect_init_func
/**
@brief
Plugin clean up
*/
static int connect_done_func(void *)
{
int error= 0;
PCONNECT pc, pn;
DBUG_ENTER("connect_done_func");
#ifdef LIBXML2_SUPPORT
XmlCleanupParserLib();
#endif // LIBXML2_SUPPORT
#ifdef JDBC_SUPPORT
JDBConn::ResetJVM();
#endif // JDBC_SUPPORT
#if defined(__WIN__)
DeleteCriticalSection((LPCRITICAL_SECTION)&parsec);
#else // !__WIN__
PROFILE_End();
#endif // !__WIN__
for (pc= user_connect::to_users; pc; pc= pn) {
if (pc->g)
PlugCleanup(pc->g, true);
pn= pc->next;
delete pc;
} // endfor pc
connect_hton= NULL;
DBUG_RETURN(error);
} // end of connect_done_func
/**
@brief
Example of simple lock controls. The "share" it creates is a
structure we will pass to each CONNECT handler. Do you have to have
one of these? Well, you have pieces that are used for locking, and
they are needed to function.
*/
CONNECT_SHARE *ha_connect::get_share()
{
CONNECT_SHARE *tmp_share;
lock_shared_ha_data();
if (!(tmp_share= static_cast<CONNECT_SHARE*>(get_ha_share_ptr()))) {
tmp_share= new CONNECT_SHARE;
if (!tmp_share)
goto err;
mysql_mutex_init(con_key_mutex_CONNECT_SHARE_mutex,
&tmp_share->mutex, MY_MUTEX_INIT_FAST);
set_ha_share_ptr(static_cast<Handler_share*>(tmp_share));
} // endif tmp_share
err:
unlock_shared_ha_data();
return tmp_share;
} // end of get_share
static handler* connect_create_handler(handlerton *hton,
TABLE_SHARE *table,
MEM_ROOT *mem_root)
{
handler *h= new (mem_root) ha_connect(hton, table);
if (trace)
htrc("New CONNECT %p, table: %.*s\n", h,
table ? table->table_name.length : 6,
table ? table->table_name.str : "<null>");
return h;
} // end of connect_create_handler
/****************************************************************************/
/* ha_connect constructor. */
/****************************************************************************/
ha_connect::ha_connect(handlerton *hton, TABLE_SHARE *table_arg)
:handler(hton, table_arg)
{
hnum= ++num;
xp= (table) ? GetUser(ha_thd(), NULL) : NULL;
if (xp)
xp->SetHandler(this);
#if defined(__WIN__)
datapath= ".\\";
#else // !__WIN__
datapath= "./";
#endif // !__WIN__
tdbp= NULL;
sdvalin1= sdvalin2= sdvalin3= sdvalin4= NULL;
sdvalout= NULL;
xmod= MODE_ANY;
istable= false;
memset(partname, 0, sizeof(partname));
bzero((char*) &xinfo, sizeof(XINFO));
valid_info= false;
valid_query_id= 0;
creat_query_id= (table && table->in_use) ? table->in_use->query_id : 0;
stop= false;
alter= false;
mrr= false;
nox= true;
abort= false;
indexing= -1;
locked= 0;
part_id= NULL;
data_file_name= NULL;
index_file_name= NULL;
enable_activate_all_index= 0;
int_table_flags= (HA_NO_TRANSACTIONS | HA_NO_PREFIX_CHAR_KEYS);
ref_length= sizeof(int);
share= NULL;
tshp= NULL;
} // end of ha_connect constructor
/****************************************************************************/
/* ha_connect destructor. */
/****************************************************************************/
ha_connect::~ha_connect(void)
{
if (trace)
htrc("Delete CONNECT %p, table: %.*s, xp=%p count=%d\n", this,
table ? table->s->table_name.length : 6,
table ? table->s->table_name.str : "<null>",
xp, xp ? xp->count : 0);
PopUser(xp);
} // end of ha_connect destructor
/****************************************************************************/
/* Check whether this user can be removed. */
/****************************************************************************/
static void PopUser(PCONNECT xp)
{
if (xp) {
xp->count--;
if (!xp->count) {
PCONNECT p;
for (p= user_connect::to_users; p; p= p->next)
if (p == xp)
break;
if (p) {
if (p->next)
p->next->previous= p->previous;
if (p->previous)
p->previous->next= p->next;
else
user_connect::to_users= p->next;
} // endif p
PlugCleanup(xp->g, true);
delete xp;
} // endif count
} // endif xp
} // end of PopUser
/****************************************************************************/
/* Get a pointer to the user of this handler. */
/****************************************************************************/
static PCONNECT GetUser(THD *thd, PCONNECT xp)
{
if (!thd)
return NULL;
if (xp && thd == xp->thdp)
return xp;
for (xp= user_connect::to_users; xp; xp= xp->next)
if (thd == xp->thdp)
break;
if (!xp) {
xp= new user_connect(thd);
if (xp->user_init()) {
delete xp;
xp= NULL;
} // endif user_init
} else
xp->count++;
return xp;
} // end of GetUser
/****************************************************************************/
/* Get the global pointer of the user of this handler. */
/****************************************************************************/
static PGLOBAL GetPlug(THD *thd, PCONNECT& lxp)
{
lxp= GetUser(thd, lxp);
return (lxp) ? lxp->g : NULL;
} // end of GetPlug
/****************************************************************************/
/* Get the implied table type. */
/****************************************************************************/
TABTYPE ha_connect::GetRealType(PTOS pos)
{
TABTYPE type;
if (pos || (pos= GetTableOptionStruct())) {
type= GetTypeID(pos->type);
if (type == TAB_UNDEF)
type= pos->srcdef ? TAB_MYSQL : pos->tabname ? TAB_PRX : TAB_DOS;
} else
type= TAB_UNDEF;
return type;
} // end of GetRealType
/** @brief
The name of the index type that will be used for display.
Don't implement this method unless you really have indexes.
*/
const char *ha_connect::index_type(uint inx)
{
switch (GetIndexType(GetRealType())) {
case 1:
if (table_share)
return (GetIndexOption(&table_share->key_info[inx], "Dynamic"))
? "KINDEX" : "XINDEX";
else
return "XINDEX";
case 2: return "REMOTE";
case 3: return "VIRTUAL";
} // endswitch
return "Unknown";
} // end of index_type
/** @brief
This is a bitmap of flags that indicates how the storage engine
implements indexes. The current index flags are documented in
handler.h. If you do not implement indexes, just return zero here.
@details
part is the key part to check. First key part is 0.
If all_parts is set, MySQL wants to know the flags for the combined
index, up to and including 'part'.
*/
//ong ha_connect::index_flags(uint inx, uint part, bool all_parts) const
ulong ha_connect::index_flags(uint, uint, bool) const
{
ulong flags= HA_READ_NEXT | HA_READ_RANGE |
HA_KEYREAD_ONLY | HA_KEY_SCAN_NOT_ROR;
ha_connect *hp= (ha_connect*)this;
PTOS pos= hp->GetTableOptionStruct();
if (pos) {
TABTYPE type= hp->GetRealType(pos);
switch (GetIndexType(type)) {
case 1: flags|= (HA_READ_ORDER | HA_READ_PREV); break;
case 2: flags|= HA_READ_AFTER_KEY; break;
} // endswitch
} // endif pos
return flags;
} // end of index_flags
/** @brief
This is a list of flags that indicate what functionality the storage
engine implements. The current table flags are documented in handler.h
*/
ulonglong ha_connect::table_flags() const
{
ulonglong flags= HA_CAN_VIRTUAL_COLUMNS | HA_REC_NOT_IN_SEQ |
HA_NO_AUTO_INCREMENT | HA_NO_PREFIX_CHAR_KEYS |
HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
HA_PARTIAL_COLUMN_READ | HA_FILE_BASED |
// HA_NULL_IN_KEY | not implemented yet
// HA_FAST_KEY_READ | causes error when sorting (???)
HA_NO_TRANSACTIONS | HA_DUPLICATE_KEY_NOT_IN_ORDER |
HA_NO_BLOBS | HA_MUST_USE_TABLE_CONDITION_PUSHDOWN;
ha_connect *hp= (ha_connect*)this;
PTOS pos= hp->GetTableOptionStruct();