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mysql_fdw.c
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/*-------------------------------------------------------------------------
*
* mysql_fdw.c
* Foreign-data wrapper for remote MySQL servers
*
* Portions Copyright (c) 2012-2014, PostgreSQL Global Development Group
* Portions Copyright (c) 2004-2022, EnterpriseDB Corporation.
*
* IDENTIFICATION
* mysql_fdw.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
/*
* Must be included before mysql.h as it has some conflicting definitions like
* list_length, etc.
*/
#include "mysql_fdw.h"
#include <dlfcn.h>
#include <errmsg.h>
#include <mysql.h>
#include <mysqld_error.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/reloptions.h"
#if PG_VERSION_NUM >= 120000
#include "access/table.h"
#endif
#include "commands/defrem.h"
#include "commands/explain.h"
#include "catalog/heap.h"
#include "foreign/fdwapi.h"
#include "miscadmin.h"
#include "mysql_query.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "nodes/nodes.h"
#if PG_VERSION_NUM >= 140000
#include "optimizer/appendinfo.h"
#endif
#include "optimizer/pathnode.h"
#include "optimizer/planmain.h"
#include "optimizer/paths.h"
#if PG_VERSION_NUM < 120000
#include "optimizer/var.h"
#else
#include "optimizer/optimizer.h"
#endif
#include "optimizer/cost.h"
#if (PG_VERSION_NUM >= 130010 && PG_VERSION_NUM < 140000) || \
(PG_VERSION_NUM >= 140007 && PG_VERSION_NUM < 150000) || \
(PG_VERSION_NUM >= 150002)
#include "optimizer/inherit.h"
#endif
#include "optimizer/clauses.h"
#include "optimizer/tlist.h"
#include "optimizer/restrictinfo.h"
#include "parser/parsetree.h"
#if PG_VERSION_NUM >= 160000
#include "parser/parse_relation.h"
#endif
#include "storage/ipc.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/syscache.h"
#include "utils/selfuncs.h"
#if PG_VERSION_NUM >= 140000
#include "executor/execAsync.h"
#include "optimizer/appendinfo.h"
#include "optimizer/prep.h"
#include "storage/latch.h"
#include "commands/defrem.h"
#endif
/* Declarations for dynamic loading */
PG_MODULE_MAGIC;
/* Default CPU cost to start up a foreign query. */
#define DEFAULT_FDW_STARTUP_COST 100.0
/* Default CPU cost to process 1 row (above and beyond cpu_tuple_cost). */
#define DEFAULT_FDW_TUPLE_COST 0.01
/* If no remote estimates, assume a sort costs 20% extra */
#define DEFAULT_FDW_SORT_MULTIPLIER 1.2
int ((mysql_options) (MYSQL * mysql, enum mysql_option option,
const void *arg));
int ((mysql_stmt_prepare) (MYSQL_STMT * stmt, const char *query,
unsigned long length));
int ((mysql_stmt_execute) (MYSQL_STMT * stmt));
int ((mysql_stmt_fetch) (MYSQL_STMT * stmt));
int ((mysql_query) (MYSQL * mysql, const char *q));
bool ((mysql_stmt_attr_set) (MYSQL_STMT * stmt,
enum enum_stmt_attr_type attr_type,
const void *attr));
bool ((mysql_stmt_close) (MYSQL_STMT * stmt));
bool ((mysql_stmt_reset) (MYSQL_STMT * stmt));
bool ((mysql_free_result) (MYSQL_RES * result));
bool ((mysql_stmt_bind_param) (MYSQL_STMT * stmt, MYSQL_BIND * bnd));
bool ((mysql_stmt_bind_result) (MYSQL_STMT * stmt, MYSQL_BIND * bnd));
MYSQL_STMT *((mysql_stmt_init) (MYSQL * mysql));
MYSQL_RES *((mysql_stmt_result_metadata) (MYSQL_STMT * stmt));
int ((mysql_stmt_store_result) (MYSQL * mysql));
MYSQL_ROW((mysql_fetch_row) (MYSQL_RES * result));
MYSQL_FIELD *((mysql_fetch_field) (MYSQL_RES * result));
MYSQL_FIELD *((mysql_fetch_fields) (MYSQL_RES * result));
const char *((mysql_error) (MYSQL * mysql));
void ((mysql_close) (MYSQL * sock));
MYSQL_RES *((mysql_store_result) (MYSQL * mysql));
MYSQL *((mysql_init) (MYSQL * mysql));
bool ((mysql_ssl_set) (MYSQL * mysql, const char *key, const char *cert,
const char *ca, const char *capath,
const char *cipher));
MYSQL *((mysql_real_connect) (MYSQL * mysql, const char *host, const char *user,
const char *passwd, const char *db,
unsigned int port, const char *unix_socket,
unsigned long clientflag));
const char *((mysql_get_host_info) (MYSQL * mysql));
const char *((mysql_get_server_info) (MYSQL * mysql));
int ((mysql_get_proto_info) (MYSQL * mysql));
unsigned int ((mysql_stmt_errno) (MYSQL_STMT * stmt));
unsigned int ((mysql_errno) (MYSQL * mysql));
unsigned int ((mysql_num_fields) (MYSQL_RES * result));
unsigned int ((mysql_num_rows) (MYSQL_RES * result));
unsigned int ((mysql_warning_count) (MYSQL * mysql));
uint64_t ((mysql_stmt_affected_rows) (MYSQL_STMT * stmt));
void ((mysql_server_end) (void));
#define DEFAULTE_NUM_ROWS 1000
#define MYSQL_DEFAULT_QUERY_PARAM_MAX_LIMIT 65535
/*
* In PG 9.5.1 the number will be 90501,
* our version is 2.9.0 so number will be 20900
*/
#define CODE_VERSION 20900
#define MYSQL_CMD_CREATE 0
#define MYSQL_CMD_DROP 1
/* Struct for extra information passed to estimate_path_cost_size() */
typedef struct
{
PathTarget *target;
bool has_final_sort;
bool has_limit;
double limit_tuples;
int64 count_est;
int64 offset_est;
} MySQLFdwPathExtraData;
/*
* This enum describes what's kept in the fdw_private list for a ForeignPath.
* We store:
*
* 1) Boolean flag showing if the remote query has the final sort
* 2) Boolean flag showing if the remote query has the LIMIT clause
*/
enum FdwPathPrivateIndex
{
/* has-final-sort flag (as a Boolean node) */
FdwPathPrivateHasFinalSort,
/* has-limit flag (as a Boolean node) */
FdwPathPrivateHasLimit
};
/* Callback argument for ec_member_matches_foreign */
typedef struct
{
Expr *current; /* current expr, or NULL if not yet found */
List *already_used; /* expressions already dealt with */
} ec_member_foreign_arg;
/*
* Indexes of FDW-private information stored in fdw_private lists.
*
* These items are indexed with the enum mysqlFdwScanPrivateIndex, so an item
* can be fetched with list_nth(). For example, to get the SELECT statement:
* sql = strVal(list_nth(fdw_private, mysqlFdwScanPrivateSelectSql));
*/
enum mysqlFdwScanPrivateIndex
{
/* SQL statement to execute remotely (as a String node) */
mysqlFdwScanPrivateSelectSql,
/* Integer list of attribute numbers retrieved by the SELECT */
mysqlFdwScanPrivateRetrievedAttrs,
/*
* String describing join i.e. names of relations being joined and types
* of join, added when the scan is join
*/
mysqlFdwScanPrivateRelations,
/*
* List of Var node lists for constructing the whole-row references of
* base relations involved in pushed down join.
*/
mysqlFdwPrivateWholeRowLists,
/*
* Targetlist representing the result fetched from the foreign server if
* whole-row references are involved.
*/
mysqlFdwPrivateScanTList
};
/*
* Similarly, this enum describes what's kept in the fdw_private list for
* a ModifyTable node referencing a mysql_fdw foreign table. We store:
*
* 1) INSERT/UPDATE/DELETE statement text to be sent to the remote server
* 2) Integer list of target attribute numbers for INSERT/UPDATE
* (NIL for a DELETE)
* 3) Length till the end of VALUES clause for INSERT
* (-1 for a DELETE/UPDATE)
* 4) Boolean flag showing if the remote query has a RETURNING clause
* 5) Integer list of attribute numbers retrieved by RETURNING, if any
*/
enum FdwModifyPrivateIndex
{
/* SQL statement to execute remotely (as a String node) */
FdwModifyPrivateUpdateSql,
/* Integer list of target attribute numbers for INSERT/UPDATE */
FdwModifyPrivateTargetAttnums,
/* Length till the end of VALUES clause (as an integer Value node) */
FdwModifyPrivateValuesEndLen,
/* has-returning flag (as a Boolean node) */
FdwModifyPrivateHasReturning,
/* Integer list of attribute numbers retrieved by RETURNING */
FdwModifyPrivateRetrievedAttrs
};
/*
* Similarly, this enum describes what's kept in the fdw_private list for
* a ForeignScan node that modifies a foreign table directly. We store:
*
* 1) UPDATE/DELETE statement text to be sent to the remote server
* 2) Boolean flag showing if the remote query has a RETURNING clause
* 3) Integer list of attribute numbers retrieved by RETURNING, if any
* 4) Boolean flag showing if we set the command es_processed
*/
enum FdwDirectModifyPrivateIndex
{
/* SQL statement to execute remotely (as a String node) */
FdwDirectModifyPrivateUpdateSql,
/* has-returning flag (as a Boolean node) */
FdwDirectModifyPrivateHasReturning,
/* Integer list of attribute numbers retrieved by RETURNING */
FdwDirectModifyPrivateRetrievedAttrs,
/* set-processed flag (as a Boolean node) */
FdwDirectModifyPrivateSetProcessed
};
/*
* Struct for path_value custom type
*/
typedef struct PathValue
{
int32 vl_len_; /* length of path_value type */
char *path;
char *value;
bool is_text_value;
} PathValue;
extern PGDLLEXPORT void _PG_init(void);
extern Datum mysql_fdw_handler(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(mysql_fdw_handler);
PG_FUNCTION_INFO_V1(mysql_fdw_version);
/* In out function for path_value type */
PG_FUNCTION_INFO_V1(path_value_in);
PG_FUNCTION_INFO_V1(path_value_out);
/*
* FDW callback routines
*/
static void mysqlExplainForeignScan(ForeignScanState *node, ExplainState *es);
static void mysqlExplainForeignModify(ModifyTableState *mtstate,
ResultRelInfo *rinfo,
List *fdw_private,
int subplan_index,
ExplainState *es);
static void mysqlBeginForeignScan(ForeignScanState *node, int eflags);
static TupleTableSlot *mysqlIterateForeignScan(ForeignScanState *node);
static void mysqlReScanForeignScan(ForeignScanState *node);
static void mysqlEndForeignScan(ForeignScanState *node);
static List *mysqlPlanForeignModify(PlannerInfo *root, ModifyTable *plan,
Index resultRelation, int subplan_index);
static void mysqlBeginForeignModify(ModifyTableState *mtstate,
ResultRelInfo *resultRelInfo,
List *fdw_private, int subplan_index,
int eflags);
static TupleTableSlot **mysql_execute_foreign_insert(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot **slots,
TupleTableSlot **planSlot,
int *numSlots);
static TupleTableSlot *mysqlExecForeignInsert(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
#if PG_VERSION_NUM >= 140000
static TupleTableSlot **mysqlExecForeignBatchInsert(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot **slots,
TupleTableSlot **planSlots,
int *numSlots);
static int mysqlGetForeignModifyBatchSize(ResultRelInfo *resultRelInfo);
static void mysqlExecForeignTruncate(List *rels,
DropBehavior behavior,
bool restart_seqs);
#endif
#if PG_VERSION_NUM >= 140000
static void mysqlAddForeignUpdateTargets(PlannerInfo *root,
Index rtindex,
RangeTblEntry *target_rte,
Relation target_relation);
#else
static void mysqlAddForeignUpdateTargets(Query *parsetree,
RangeTblEntry *target_rte,
Relation target_relation);
#endif
static TupleTableSlot *mysqlExecForeignUpdate(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static TupleTableSlot *mysqlExecForeignDelete(EState *estate,
ResultRelInfo *resultRelInfo,
TupleTableSlot *slot,
TupleTableSlot *planSlot);
static void mysqlEndForeignModify(EState *estate,
ResultRelInfo *resultRelInfo);
static bool mysqlPlanDirectModify(PlannerInfo *root,
ModifyTable *plan,
Index resultRelation,
int subplan_index);
static void mysqlBeginDirectModify(ForeignScanState *node, int eflags);
static TupleTableSlot *mysqlIterateDirectModify(ForeignScanState *node);
static void mysqlEndDirectModify(ForeignScanState *node);
static void mysqlExplainDirectModify(ForeignScanState *node,
struct ExplainState *es);
static void mysqlGetForeignRelSize(PlannerInfo *root, RelOptInfo *baserel,
Oid foreigntableid);
static void mysqlGetForeignPaths(PlannerInfo *root, RelOptInfo *baserel,
Oid foreigntableid);
static bool mysqlAnalyzeForeignTable(Relation relation,
AcquireSampleRowsFunc *func,
BlockNumber *totalpages);
#if PG_VERSION_NUM >= 90500
static ForeignScan *mysqlGetForeignPlan(PlannerInfo *root,
RelOptInfo *foreignrel,
Oid foreigntableid,
ForeignPath *best_path, List *tlist,
List *scan_clauses, Plan *outer_plan);
#else
static ForeignScan *mysqlGetForeignPlan(PlannerInfo *root,
RelOptInfo *foreignrel,
Oid foreigntableid,
ForeignPath *best_path, List *tlist,
List *scan_clauses);
#endif
static void mysqlEstimateCosts(PlannerInfo *root, RelOptInfo *baserel,
Cost *startup_cost, Cost *total_cost,
Oid foreigntableid);
#if PG_VERSION_NUM >= 90500
static List *mysqlImportForeignSchema(ImportForeignSchemaStmt *stmt,
Oid serverOid);
#endif
static void mysqlGetForeignJoinPaths(PlannerInfo *root,
RelOptInfo *joinrel,
RelOptInfo *outerrel,
RelOptInfo *innerrel,
JoinType jointype,
JoinPathExtraData *extra);
#if PG_VERSION_NUM >= 110000
static void mysqlBeginForeignInsert(ModifyTableState *mtstate,
ResultRelInfo *resultRelInfo);
static void mysqlEndForeignInsert(EState *estate,
ResultRelInfo *resultRelInfo);
#endif
static void mysqlGetForeignUpperPaths(PlannerInfo *root,
UpperRelationKind stage,
RelOptInfo *input_rel,
RelOptInfo *output_rel,
void *extra);
static List *mysql_adjust_whole_row_ref(PlannerInfo *root,
List *scan_var_list,
List **whole_row_lists,
Bitmapset *relids);
static List *mysql_build_scan_list_for_baserel(Oid relid, Index varno,
Bitmapset *attrs_used,
List **retrieved_attrs);
static void mysql_build_whole_row_constr_info(MySQLFdwExecState * festate,
TupleDesc tupdesc,
Bitmapset *relids,
int max_relid,
List *whole_row_lists,
List *scan_tlist,
List *fdw_scan_tlist);
static HeapTuple mysql_get_tuple_with_whole_row(MySQLFdwExecState * festate,
Datum *values, bool *nulls);
static HeapTuple mysql_form_whole_row(MySQLWRState * wr_state, Datum *values,
bool *nulls);
/*
* Helper functions
*/
bool mysql_load_library(void);
static void mysql_fdw_exit(int code, Datum arg);
static bool mysql_is_column_unique(Oid foreigntableid, Oid userid);
static void estimate_path_cost_size(PlannerInfo *root,
RelOptInfo *foreignrel,
List *param_join_conds,
List *pathkeys,
MySQLFdwPathExtraData * fpextra,
double *p_rows, int *p_width,
Cost *p_startup_cost, Cost *p_total_cost);
static void get_remote_estimate(const char *sql,
MYSQL * conn,
double *rows,
int *width,
Cost *startup_cost,
Cost *total_cost);
static void adjust_foreign_grouping_path_cost(PlannerInfo *root,
List *pathkeys,
double retrieved_rows,
double width,
double limit_tuples,
Cost *p_startup_cost,
Cost *p_run_cost);
static List *get_useful_pathkeys_for_relation(PlannerInfo *root,
RelOptInfo *rel);
static List *get_useful_ecs_for_relation(PlannerInfo *root, RelOptInfo *rel);
static void prepare_query_params(PlanState *node,
List *fdw_exprs,
int numParams,
FmgrInfo **param_flinfo,
List **param_exprs,
const char ***param_values,
Oid **param_types);
static void process_query_params(ExprContext *econtext,
FmgrInfo *param_flinfo,
List *param_exprs,
const char **param_values,
MYSQL_BIND * *mysql_bind_buf,
Oid *param_types);
static void bind_stmt_params_and_exec(ForeignScanState *node);
static void execute_dml_stmt(ForeignScanState *node);
void *mysql_dll_handle = NULL;
static int wait_timeout = WAIT_TIMEOUT;
static int interactive_timeout = INTERACTIVE_TIMEOUT;
#if (PG_VERSION_NUM >= 130010 && PG_VERSION_NUM < 140000) || \
(PG_VERSION_NUM >= 140007 && PG_VERSION_NUM < 150000) || \
(PG_VERSION_NUM >= 150002)
static List *getUpdateTargetAttrs(PlannerInfo *root, Index resultRelation);
#else
static List *getUpdateTargetAttrs(RangeTblEntry *rte);
#endif
static bool foreign_join_ok(PlannerInfo *root, RelOptInfo *joinrel,
JoinType jointype, RelOptInfo *outerrel, RelOptInfo *innerrel,
JoinPathExtraData *extra);
static void add_paths_with_pathkeys_for_rel(PlannerInfo *root, RelOptInfo *rel,
Path *epq_path);
static void add_foreign_grouping_paths(PlannerInfo *root,
RelOptInfo *input_rel,
RelOptInfo *grouped_rel,
GroupPathExtraData *extra);
static void add_foreign_ordered_paths(PlannerInfo *root,
RelOptInfo *input_rel,
RelOptInfo *ordered_rel);
static void add_foreign_final_paths(PlannerInfo *root,
RelOptInfo *input_rel,
RelOptInfo *final_rel,
FinalPathExtraData *extra);
static void apply_server_options(MySQLFdwRelationInfo * fpinfo);
static void apply_table_options(MySQLFdwRelationInfo * fpinfo);
static void merge_fdw_options(MySQLFdwRelationInfo * fpinfo,
const MySQLFdwRelationInfo * fpinfo_o,
const MySQLFdwRelationInfo * fpinfo_i);
static bool ec_member_matches_foreign(PlannerInfo *root, RelOptInfo *rel,
EquivalenceClass *ec, EquivalenceMember *em,
void *arg);
#if PG_VERSION_NUM >= 140000
static int get_batch_size_option(Relation rel);
static char *mysql_remove_backtick_quotes(char *s1);
#endif
static void mysql_close_stmt_handler(MYSQL * conn, MYSQL_STMT *stmt);
/*
* mysql_load_library function dynamically load the mysql's library
* libmysqlclient.so. The only reason to load the library using dlopen
* is that, mysql and postgres both have function with same name like
* "list_delete", "list_delete" and "list_free" which cause compiler
* error "duplicate function name" and erroneously linking with a function.
* This port of the code is used to avoid the compiler error.
*
* #define list_delete mysql_list_delete
* #include <mysql.h>
* #undef list_delete
*
* But system crashed on function mysql_stmt_close function because
* mysql_stmt_close internally calling "list_delete" function which
* wrongly binds to postgres' "list_delete" function.
*
* The dlopen function provides a parameter "RTLD_DEEPBIND" which
* solved the binding issue.
*
* RTLD_DEEPBIND:
* Place the lookup scope of the symbols in this library ahead of the
* global scope. This means that a self-contained library will use its
* own symbols in preference to global symbols with the same name contained
* in libraries that have already been loaded.
*/
bool
mysql_load_library(void)
{
#if defined(__APPLE__) || defined(__FreeBSD__)
/*
* Mac OS/BSD does not support RTLD_DEEPBIND, but it still works without
* the RTLD_DEEPBIND
*/
mysql_dll_handle = dlopen(_MYSQL_LIBNAME, RTLD_LAZY);
#else
mysql_dll_handle = dlopen(_MYSQL_LIBNAME, RTLD_LAZY | RTLD_DEEPBIND);
#endif
if (mysql_dll_handle == NULL)
return false;
_mysql_stmt_bind_param = dlsym(mysql_dll_handle, "mysql_stmt_bind_param");
_mysql_stmt_bind_result = dlsym(mysql_dll_handle, "mysql_stmt_bind_result");
_mysql_stmt_init = dlsym(mysql_dll_handle, "mysql_stmt_init");
_mysql_stmt_prepare = dlsym(mysql_dll_handle, "mysql_stmt_prepare");
_mysql_stmt_execute = dlsym(mysql_dll_handle, "mysql_stmt_execute");
_mysql_stmt_fetch = dlsym(mysql_dll_handle, "mysql_stmt_fetch");
_mysql_query = dlsym(mysql_dll_handle, "mysql_query");
_mysql_stmt_result_metadata = dlsym(mysql_dll_handle, "mysql_stmt_result_metadata");
_mysql_stmt_store_result = dlsym(mysql_dll_handle, "mysql_stmt_store_result");
_mysql_fetch_row = dlsym(mysql_dll_handle, "mysql_fetch_row");
_mysql_fetch_field = dlsym(mysql_dll_handle, "mysql_fetch_field");
_mysql_fetch_fields = dlsym(mysql_dll_handle, "mysql_fetch_fields");
_mysql_stmt_close = dlsym(mysql_dll_handle, "mysql_stmt_close");
_mysql_stmt_reset = dlsym(mysql_dll_handle, "mysql_stmt_reset");
_mysql_free_result = dlsym(mysql_dll_handle, "mysql_free_result");
_mysql_error = dlsym(mysql_dll_handle, "mysql_error");
_mysql_options = dlsym(mysql_dll_handle, "mysql_options");
_mysql_ssl_set = dlsym(mysql_dll_handle, "mysql_ssl_set");
_mysql_real_connect = dlsym(mysql_dll_handle, "mysql_real_connect");
_mysql_close = dlsym(mysql_dll_handle, "mysql_close");
_mysql_init = dlsym(mysql_dll_handle, "mysql_init");
_mysql_stmt_attr_set = dlsym(mysql_dll_handle, "mysql_stmt_attr_set");
_mysql_store_result = dlsym(mysql_dll_handle, "mysql_store_result");
_mysql_stmt_errno = dlsym(mysql_dll_handle, "mysql_stmt_errno");
_mysql_errno = dlsym(mysql_dll_handle, "mysql_errno");
_mysql_num_fields = dlsym(mysql_dll_handle, "mysql_num_fields");
_mysql_num_rows = dlsym(mysql_dll_handle, "mysql_num_rows");
_mysql_get_host_info = dlsym(mysql_dll_handle, "mysql_get_host_info");
_mysql_get_server_info = dlsym(mysql_dll_handle, "mysql_get_server_info");
_mysql_get_proto_info = dlsym(mysql_dll_handle, "mysql_get_proto_info");
_mysql_warning_count = dlsym(mysql_dll_handle, "mysql_warning_count");
_mysql_stmt_affected_rows = dlsym(mysql_dll_handle, "mysql_stmt_affected_rows");
_mysql_server_end = dlsym(mysql_dll_handle, "mysql_server_end");
if (_mysql_stmt_bind_param == NULL ||
_mysql_stmt_bind_result == NULL ||
_mysql_stmt_init == NULL ||
_mysql_stmt_prepare == NULL ||
_mysql_stmt_execute == NULL ||
_mysql_stmt_fetch == NULL ||
_mysql_query == NULL ||
_mysql_stmt_result_metadata == NULL ||
_mysql_stmt_store_result == NULL ||
_mysql_fetch_row == NULL ||
_mysql_fetch_field == NULL ||
_mysql_fetch_fields == NULL ||
_mysql_stmt_close == NULL ||
_mysql_stmt_reset == NULL ||
_mysql_free_result == NULL ||
_mysql_error == NULL ||
_mysql_options == NULL ||
_mysql_ssl_set == NULL ||
_mysql_real_connect == NULL ||
_mysql_close == NULL ||
_mysql_init == NULL ||
_mysql_stmt_attr_set == NULL ||
_mysql_store_result == NULL ||
_mysql_stmt_errno == NULL ||
_mysql_errno == NULL ||
_mysql_num_fields == NULL ||
_mysql_num_rows == NULL ||
_mysql_get_host_info == NULL ||
_mysql_get_server_info == NULL ||
_mysql_get_proto_info == NULL ||
_mysql_warning_count == NULL ||
_mysql_stmt_affected_rows == NULL ||
_mysql_server_end == NULL)
return false;
return true;
}
/*
* Library load-time initialization, sets on_proc_exit() callback for
* backend shutdown.
*/
void
_PG_init(void)
{
if (!mysql_load_library())
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to load the mysql query: \n%s", dlerror()),
errhint("Export LD_LIBRARY_PATH to locate the library.")));
DefineCustomIntVariable("mysql_fdw.wait_timeout",
"Server-side wait_timeout",
"Set the maximum wait_timeout"
"use to set the MySQL session timeout",
&wait_timeout,
WAIT_TIMEOUT,
0,
INT_MAX,
PGC_USERSET,
0,
NULL,
NULL,
NULL);
DefineCustomIntVariable("mysql_fdw.interactive_timeout",
"Server-side interactive timeout",
"Set the maximum interactive timeout"
"use to set the MySQL session timeout",
&interactive_timeout,
INTERACTIVE_TIMEOUT,
0,
INT_MAX,
PGC_USERSET,
0,
NULL,
NULL,
NULL);
on_proc_exit(&mysql_fdw_exit, PointerGetDatum(NULL));
}
/*
* mysql_fdw_exit
* Exit callback function.
*/
static void
mysql_fdw_exit(int code, Datum arg)
{
mysql_cleanup_connection();
/*
* No longer to use the mysql client library,
* clean up and free resources used by the library.
*/
mysql_server_end();
}
/*
* Foreign-data wrapper handler function: return
* a struct with pointers to my callback routines.
*/
Datum
mysql_fdw_handler(PG_FUNCTION_ARGS)
{
FdwRoutine *fdwroutine = makeNode(FdwRoutine);
/* Functions for scanning foreign tables */
fdwroutine->GetForeignRelSize = mysqlGetForeignRelSize;
fdwroutine->GetForeignPaths = mysqlGetForeignPaths;
fdwroutine->GetForeignPlan = mysqlGetForeignPlan;
fdwroutine->BeginForeignScan = mysqlBeginForeignScan;
fdwroutine->IterateForeignScan = mysqlIterateForeignScan;
fdwroutine->ReScanForeignScan = mysqlReScanForeignScan;
fdwroutine->EndForeignScan = mysqlEndForeignScan;
/* Functions for updating foreign tables */
fdwroutine->AddForeignUpdateTargets = mysqlAddForeignUpdateTargets;
fdwroutine->PlanForeignModify = mysqlPlanForeignModify;
fdwroutine->BeginForeignModify = mysqlBeginForeignModify;
fdwroutine->ExecForeignInsert = mysqlExecForeignInsert;
#if PG_VERSION_NUM >= 140000
fdwroutine->ExecForeignBatchInsert = mysqlExecForeignBatchInsert;
fdwroutine->GetForeignModifyBatchSize = mysqlGetForeignModifyBatchSize;
#endif
fdwroutine->ExecForeignUpdate = mysqlExecForeignUpdate;
fdwroutine->ExecForeignDelete = mysqlExecForeignDelete;
fdwroutine->EndForeignModify = mysqlEndForeignModify;
/* suport for Direct Modification */
fdwroutine->PlanDirectModify = mysqlPlanDirectModify;
fdwroutine->BeginDirectModify = mysqlBeginDirectModify;
fdwroutine->IterateDirectModify = mysqlIterateDirectModify;
fdwroutine->EndDirectModify = mysqlEndDirectModify;
/* Support functions for EXPLAIN */
fdwroutine->ExplainForeignScan = mysqlExplainForeignScan;
fdwroutine->ExplainDirectModify = mysqlExplainDirectModify;
fdwroutine->ExplainForeignModify = mysqlExplainForeignModify;
#if PG_VERSION_NUM >= 140000
/* Support function for TRUNCATE */
fdwroutine->ExecForeignTruncate = mysqlExecForeignTruncate;
#endif
/* Support functions for ANALYZE */
fdwroutine->AnalyzeForeignTable = mysqlAnalyzeForeignTable;
/* Support functions for IMPORT FOREIGN SCHEMA */
#if PG_VERSION_NUM >= 90500
fdwroutine->ImportForeignSchema = mysqlImportForeignSchema;
#endif
#if PG_VERSION_NUM >= 110000
/* Partition routing and/or COPY from */
fdwroutine->BeginForeignInsert = mysqlBeginForeignInsert;
fdwroutine->EndForeignInsert = mysqlEndForeignInsert;
#endif
/* Support functions for join push-down */
fdwroutine->GetForeignJoinPaths = mysqlGetForeignJoinPaths;
/* Support functions for upper relation push-down */
fdwroutine->GetForeignUpperPaths = mysqlGetForeignUpperPaths;
PG_RETURN_POINTER(fdwroutine);
}
/*
* mysqlBeginForeignScan
* Initiate access to the database
*/
static void
mysqlBeginForeignScan(ForeignScanState *node, int eflags)
{
TupleTableSlot *tupleSlot = node->ss.ss_ScanTupleSlot;
TupleDesc tupleDescriptor = tupleSlot->tts_tupleDescriptor;
MYSQL *conn;
RangeTblEntry *rte;
MySQLFdwExecState *festate;
EState *estate = node->ss.ps.state;
ForeignScan *fsplan = (ForeignScan *) node->ss.ps.plan;
mysql_opt *options;
ListCell *lc;
int atindex = 0;
unsigned long type = (unsigned long) CURSOR_TYPE_READ_ONLY;
Oid userid;
ForeignServer *server;
UserMapping *user;
ForeignTable *table;
StringInfoData set_sql;
int numParams;
int rtindex;
List *fdw_private = fsplan->fdw_private;
/*
* Do nothing in EXPLAIN (no ANALYZE) case. node->fdw_state stays NULL.
*/
if (eflags & EXEC_FLAG_EXPLAIN_ONLY)
return;
/*
* We'll save private state in node->fdw_state.
*/
festate = (MySQLFdwExecState *) palloc0(sizeof(MySQLFdwExecState));
node->fdw_state = (void *) festate;
/*
* If whole-row references are involved in pushed down join extract the
* information required to construct those.
*/
if (list_length(fdw_private) >= mysqlFdwPrivateScanTList)
{
List *whole_row_lists = list_nth(fdw_private,
mysqlFdwPrivateWholeRowLists);
List *scan_tlist = list_nth(fdw_private,
mysqlFdwPrivateScanTList);
TupleDesc scan_tupdesc = ExecTypeFromTL(scan_tlist);
mysql_build_whole_row_constr_info(festate, tupleDescriptor,
#if PG_VERSION_NUM < 160000
fsplan->fs_relids,
#else
fsplan->fs_base_relids,
#endif
list_length(node->ss.ps.state->es_range_table),
whole_row_lists, scan_tlist,
fsplan->fdw_scan_tlist);
/* Change tuple descriptor to match the result from foreign server. */
tupleDescriptor = scan_tupdesc;
}
/*
* Identify which user to do the remote access as. This should match what
* ExecCheckRTEPerms() does.
*/
if (fsplan->scan.scanrelid > 0)
rtindex = fsplan->scan.scanrelid;
else
#if PG_VERSION_NUM < 160000
rtindex = bms_next_member(fsplan->fs_relids, -1);
#else
rtindex = bms_next_member(fsplan->fs_base_relids, -1);
#endif
rte = exec_rt_fetch(rtindex, estate);
#if PG_VERSION_NUM < 160000
userid = rte->checkAsUser ? rte->checkAsUser : GetUserId();
#else
userid = OidIsValid(fsplan->checkAsUser) ? fsplan->checkAsUser : GetUserId();
#endif
/* Get info about foreign table. */
table = GetForeignTable(rte->relid);
server = GetForeignServer(table->serverid);
user = GetUserMapping(userid, server->serverid);
/* Fetch the options */
options = mysql_get_options(rte->relid, true);
/*
* Get the already connected connection, otherwise connect and get the
* connection handle.
*/
conn = mysql_get_connection(server, user, options);
/* Stash away the state info we have already */
festate->query = strVal(list_nth(fsplan->fdw_private,
mysqlFdwScanPrivateSelectSql));
festate->retrieved_attrs = list_nth(fsplan->fdw_private,
mysqlFdwScanPrivateRetrievedAttrs);
festate->conn = conn;
festate->query_executed = false;
festate->attinmeta = TupleDescGetAttInMetadata(tupleDescriptor);
/* Prepare for output conversion of parameters used in remote query. */
numParams = list_length(fsplan->fdw_exprs);
festate->numParams = numParams;
if (numParams > 0)
prepare_query_params((PlanState *) node,
fsplan->fdw_exprs,
numParams,
&festate->param_flinfo,
&festate->param_exprs,
&festate->param_values,
&festate->param_types);
/* Build the SET query */
initStringInfo(&set_sql);
if (wait_timeout > 0)
{
/* Set the session timeout in seconds */
appendStringInfo(&set_sql, "SET wait_timeout = %d", wait_timeout);
if (mysql_query(festate->conn, set_sql.data) != 0)
mysql_error_print(conn, NULL);
}
if (interactive_timeout > 0)
{
/* Set the session timeout in seconds */
resetStringInfo(&set_sql);
appendStringInfo(&set_sql, "SET interactive_timeout = %d", interactive_timeout);
if (mysql_query(festate->conn, set_sql.data) != 0)
mysql_error_print(conn, NULL);
}
/* Change sql_mode to TRADITIONAL to catch warning "Division by 0" */
if (mysql_query(festate->conn, "SET sql_mode='TRADITIONAL'") != 0)
mysql_error_print(conn, NULL);
/*
* Use PG_TRY block to ensure closing the MySQL statement handler on any error.
*/
PG_TRY();
{
/* Initialize the MySQL statement */
festate->stmt = mysql_stmt_init(festate->conn);
if (festate->stmt == NULL)
mysql_error_print(festate->conn, "failed to initialize the MySQL statement handler");
/* Prepare MySQL statement */
if (mysql_stmt_prepare(festate->stmt, festate->query,
strlen(festate->query)) != 0)
mysql_error_print(festate->conn, "failed to prepare the MySQL query");
/* Set the statement as cursor type */
if (mysql_stmt_attr_set(festate->stmt, STMT_ATTR_CURSOR_TYPE, (void *) &type) != 0)
mysql_error_print(festate->conn, "failed to set the statement as cursor type");
/* Set the pre-fetch rows */
if (mysql_stmt_attr_set(festate->stmt, STMT_ATTR_PREFETCH_ROWS,
(void *) &options->fetch_size) != 0)
mysql_error_print(festate->conn, "failed to set the pre-fetch rows");
if (tupleDescriptor->natts > 0)
{
festate->table = (mysql_table *) palloc0(sizeof(mysql_table));
festate->table->column = (mysql_column *) palloc0(sizeof(mysql_column) * tupleDescriptor->natts);
festate->table->mysql_bind = (MYSQL_BIND *) palloc0(sizeof(MYSQL_BIND) * tupleDescriptor->natts);
festate->table->mysql_res = mysql_stmt_result_metadata(festate->stmt);
if (NULL == festate->table->mysql_res)
mysql_error_print(festate->conn, "failed to retrieve query result set metadata");
festate->table->mysql_fields = mysql_fetch_fields(festate->table->mysql_res);
foreach(lc, festate->retrieved_attrs)
{
int attnum = lfirst_int(lc) - 1;
Oid pgtype = TupleDescAttr(tupleDescriptor, attnum)->atttypid;
int32 pgtypmod = TupleDescAttr(tupleDescriptor, attnum)->atttypmod;
if (TupleDescAttr(tupleDescriptor, attnum)->attisdropped)
continue;
festate->table->column[atindex].mysql_bind = &festate->table->mysql_bind[atindex];
mysql_bind_result(pgtype, pgtypmod,
&festate->table->mysql_fields[atindex],
&festate->table->column[atindex]);
atindex++;
}
/* Bind the results pointers for the prepare statements */
if (mysql_stmt_bind_result(festate->stmt, festate->table->mysql_bind) != 0)
mysql_error_print(festate->conn, "failed to bind the MySQL query");
}
}
PG_CATCH();
{
/* Release MYSQL statement handler if we managed to create one */
mysql_close_stmt_handler(festate->conn, festate->stmt);
PG_RE_THROW();
}
PG_END_TRY();
}
/*
* mysqlIterateForeignScan
* Iterate and get the rows one by one from MySQL and placed in tuple
* slot
*/
static TupleTableSlot *
mysqlIterateForeignScan(ForeignScanState *node)
{
MySQLFdwExecState *festate = (MySQLFdwExecState *) node->fdw_state;
TupleTableSlot *tupleSlot = node->ss.ss_ScanTupleSlot;
/*
* Use PG_TRY block to ensure closing the MySQL statement handler on any error.
*/
PG_TRY();
{
AttInMetadata *attinmeta = festate->attinmeta;
ForeignScan *fsplan = (ForeignScan *) node->ss.ps.plan;
List *fdw_private = fsplan->fdw_private;
ListCell *lc;
HeapTuple tup;
int attid;