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mysql_fdw.c
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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) 2004-2014, EnterpriseDB Corporation.
*
* IDENTIFICATION
* mysql_fdw.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "mysql_fdw.h"
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dlfcn.h>
#include <mysql.h>
#include <errmsg.h>
#include "access/reloptions.h"
#if PG_VERSION_NUM >= 120000
#include "access/table.h"
#endif
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_foreign_table.h"
#include "catalog/pg_user_mapping.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "commands/explain.h"
#include "commands/vacuum.h"
#include "foreign/fdwapi.h"
#include "foreign/foreign.h"
#include "nodes/makefuncs.h"
#include "optimizer/cost.h"
#include "optimizer/pathnode.h"
#include "optimizer/plancat.h"
#include "optimizer/planmain.h"
#include "optimizer/restrictinfo.h"
#include "storage/ipc.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/hsearch.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/timestamp.h"
#include "utils/formatting.h"
#include "utils/memutils.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "commands/defrem.h"
#include "commands/explain.h"
#include "commands/vacuum.h"
#include "foreign/fdwapi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/cost.h"
#include "optimizer/pathnode.h"
#include "optimizer/paths.h"
#include "optimizer/planmain.h"
#include "optimizer/prep.h"
#include "optimizer/restrictinfo.h"
#if PG_VERSION_NUM < 120000
#include "optimizer/var.h"
#else
#include "optimizer/optimizer.h"
#endif
#include "parser/parsetree.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "optimizer/pathnode.h"
#include "optimizer/restrictinfo.h"
#include "optimizer/planmain.h"
#include "mysql_query.h"
#define DEFAULTE_NUM_ROWS 1000
/*
* In PG 9.5.1 the number will be 90501,
* our version is 2.5.3 so number will be 20503
*/
#define CODE_VERSION 20503
PG_MODULE_MAGIC;
typedef struct MySQLFdwRelationInfo
{
/* baserestrictinfo clauses, broken down into safe and unsafe subsets. */
List *remote_conds;
List *local_conds;
/* Bitmap of attr numbers we need to fetch from the remote server. */
Bitmapset *attrs_used;
} MySQLFdwRelationInfo;
extern Datum mysql_fdw_handler(PG_FUNCTION_ARGS);
extern PGDLLEXPORT void _PG_init(void);
bool mysql_load_library(void);
static void mysql_fdw_exit(int code, Datum arg);
PG_FUNCTION_INFO_V1(mysql_fdw_handler);
PG_FUNCTION_INFO_V1(mysql_fdw_version);
/*
* FDW callback routines
*/
static void mysqlExplainForeignScan(ForeignScanState *node, 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 *mysqlExecForeignInsert(EState *estate, ResultRelInfo *resultRelInfo,
TupleTableSlot *slot, TupleTableSlot *planSlot);
static void mysqlAddForeignUpdateTargets(Query *parsetree, RangeTblEntry *target_rte,
Relation target_relation);
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 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);
static ForeignScan *mysqlGetForeignPlan(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid,
ForeignPath *best_path, List * tlist, List *scan_clauses
#if PG_VERSION_NUM >= 90500
,Plan * outer_plan
#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 bool mysql_is_column_unique(Oid foreigntableid);
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 create_cursor(ForeignScanState *node);
void* mysql_dll_handle = NULL;
static int wait_timeout = WAIT_TIMEOUT;
static int interactive_timeout = INTERACTIVE_TIMEOUT;
/*
* 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");
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)
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();
}
/*
* 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);
/* Callback functions for readable FDW */
fdwroutine->GetForeignRelSize = mysqlGetForeignRelSize;
fdwroutine->GetForeignPaths = mysqlGetForeignPaths;
fdwroutine->AnalyzeForeignTable = mysqlAnalyzeForeignTable;
fdwroutine->GetForeignPlan = mysqlGetForeignPlan;
fdwroutine->ExplainForeignScan = mysqlExplainForeignScan;
fdwroutine->BeginForeignScan = mysqlBeginForeignScan;
fdwroutine->IterateForeignScan = mysqlIterateForeignScan;
fdwroutine->ReScanForeignScan = mysqlReScanForeignScan;
fdwroutine->EndForeignScan = mysqlEndForeignScan;
#if PG_VERSION_NUM >= 90500
fdwroutine->ImportForeignSchema = mysqlImportForeignSchema;
#endif
/* Callback functions for writeable FDW */
fdwroutine->ExecForeignInsert = mysqlExecForeignInsert;
fdwroutine->BeginForeignModify = mysqlBeginForeignModify;
fdwroutine->PlanForeignModify = mysqlPlanForeignModify;
fdwroutine->AddForeignUpdateTargets = mysqlAddForeignUpdateTargets;
fdwroutine->ExecForeignUpdate = mysqlExecForeignUpdate;
fdwroutine->ExecForeignDelete = mysqlExecForeignDelete;
fdwroutine->EndForeignModify = mysqlEndForeignModify;
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 = NULL;
RangeTblEntry *rte;
MySQLFdwExecState *festate = NULL;
EState *estate = node->ss.ps.state;
ForeignScan *fsplan = (ForeignScan *) node->ss.ps.plan;
mysql_opt *options;
ListCell *lc = NULL;
int atindex = 0;
unsigned long prefetch_rows = MYSQL_PREFETCH_ROWS;
unsigned long type = (unsigned long) CURSOR_TYPE_READ_ONLY;
Oid userid;
ForeignServer *server;
UserMapping *user;
ForeignTable *table;
char timeout[255];
int numParams;
/*
* We'll save private state in node->fdw_state.
*/
festate = (MySQLFdwExecState *) palloc(sizeof(MySQLFdwExecState));
node->fdw_state = (void *) festate;
/*
* Identify which user to do the remote access as. This should match what
* ExecCheckRTEPerms() does.
*/
rte = rt_fetch(fsplan->scan.scanrelid, estate->es_range_table);
userid = rte->checkAsUser ? rte->checkAsUser : GetUserId();
/* Get info about foreign table. */
festate->rel = node->ss.ss_currentRelation;
table = GetForeignTable(RelationGetRelid(festate->rel));
server = GetForeignServer(table->serverid);
user = GetUserMapping(userid, server->serverid);
/* Fetch the options */
options = mysql_get_options(RelationGetRelid(node->ss.ss_currentRelation));
/*
* 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, 0));
festate->retrieved_attrs = list_nth(fsplan->fdw_private, 1);
festate->conn = conn;
festate->cursor_exists = false;
festate->temp_cxt = AllocSetContextCreate(estate->es_query_cxt,
"mysql_fdw temporary data",
#if PG_VERSION_NUM >= 110000
ALLOCSET_DEFAULT_SIZES);
#else
ALLOCSET_SMALL_MINSIZE,
ALLOCSET_SMALL_INITSIZE,
ALLOCSET_SMALL_MAXSIZE);
#endif
if (wait_timeout > 0)
{
/* Set the session timeout in seconds*/
sprintf(timeout, "SET wait_timeout = %d", wait_timeout);
_mysql_query(festate->conn, timeout);
}
if (interactive_timeout > 0)
{
/* Set the session timeout in seconds*/
sprintf(timeout, "SET interactive_timeout = %d", interactive_timeout);
_mysql_query(festate->conn, timeout);
}
_mysql_query(festate->conn, "SET sql_mode='ANSI_QUOTES'");
/* Initialize the MySQL statement */
festate->stmt = _mysql_stmt_init(festate->conn);
if (festate->stmt == NULL)
{
char *err = pstrdup(_mysql_error(festate->conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to initialize the mysql query: \n%s", err)));
}
/* Prepare MySQL statement */
if (_mysql_stmt_prepare(festate->stmt, festate->query, strlen(festate->query)) != 0)
{
switch(_mysql_stmt_errno(festate->stmt))
{
case CR_NO_ERROR:
break;
case CR_OUT_OF_MEMORY:
case CR_SERVER_GONE_ERROR:
case CR_SERVER_LOST:
{
char *err = pstrdup(_mysql_error(festate->conn));
mysql_rel_connection(festate->conn);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to prepare the MySQL query: \n%s", err)));
}
break;
case CR_COMMANDS_OUT_OF_SYNC:
case CR_UNKNOWN_ERROR:
default:
{
char *err = pstrdup(_mysql_error(festate->conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to prepare the MySQL query: \n%s", err)));
}
break;
}
}
/* 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);
/*
* If this is the first call after Begin or ReScan, we need to create the
* cursor on the remote side.
*/
if (!festate->cursor_exists)
create_cursor(node);
/* int column_count = mysql_num_fields(festate->meta); */
/* Set the statement as cursor type */
_mysql_stmt_attr_set(festate->stmt, STMT_ATTR_CURSOR_TYPE, (void*) &type);
/* Set the pre-fetch rows */
_mysql_stmt_attr_set(festate->stmt, STMT_ATTR_PREFETCH_ROWS, (void*) &prefetch_rows);
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)
{
char *err = pstrdup(_mysql_error(festate->conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to retrieve query result set metadata: \n%s", err)));
}
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)
{
switch(_mysql_stmt_errno(festate->stmt))
{
case CR_NO_ERROR:
break;
case CR_OUT_OF_MEMORY:
case CR_SERVER_GONE_ERROR:
case CR_SERVER_LOST:
{
char *err = pstrdup(_mysql_error(festate->conn));
mysql_rel_connection(festate->conn);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to bind the MySQL query: \n%s", err)));
}
break;
case CR_COMMANDS_OUT_OF_SYNC:
case CR_UNKNOWN_ERROR:
default:
{
char *err = pstrdup(_mysql_error(festate->conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to bind the MySQL query: \n%s", err)));
}
break;
}
}
/*
* Finally execute the query and result will be placed in the
* array we already bind
*/
if (_mysql_stmt_execute(festate->stmt) != 0)
{
switch(_mysql_stmt_errno(festate->stmt))
{
case CR_NO_ERROR:
break;
case CR_OUT_OF_MEMORY:
case CR_SERVER_GONE_ERROR:
case CR_SERVER_LOST:
{
char *err = pstrdup(_mysql_error(festate->conn));
mysql_rel_connection(festate->conn);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
break;
case CR_COMMANDS_OUT_OF_SYNC:
case CR_UNKNOWN_ERROR:
default:
{
char *err = pstrdup(_mysql_error(festate->conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
break;
}
}
}
/*
* 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;
TupleDesc tupleDescriptor = tupleSlot->tts_tupleDescriptor;
int attid = 0;
ListCell *lc = NULL;
int rc = 0;
Datum *tupleSlot_tts_values = slot_get_values(tupleSlot);
bool *tupleSlot_tts_isnull = slot_get_isnull(tupleSlot);
memset (tupleSlot_tts_values, 0, sizeof(Datum) * tupleDescriptor->natts);
memset (tupleSlot_tts_isnull, true, sizeof(bool) * tupleDescriptor->natts);
ExecClearTuple(tupleSlot);
attid = 0;
rc = _mysql_stmt_fetch(festate->stmt);
if (0 == rc)
{
foreach(lc, festate->retrieved_attrs)
{
int attnum = lfirst_int(lc) - 1;
Oid pgtype = TupleDescAttr(tupleDescriptor, attnum)->atttypid;
int32 pgtypmod = TupleDescAttr(tupleDescriptor, attnum)->atttypmod;
tupleSlot_tts_isnull[attnum] = festate->table->column[attid].is_null;
if (!festate->table->column[attid].is_null)
tupleSlot_tts_values[attnum] = mysql_convert_to_pg(pgtype, pgtypmod,
&festate->table->column[attid]);
attid++;
}
ExecStoreVirtualTuple(tupleSlot);
}
else if (1 == rc)
{
/*
Error occurred. Error code and message can be obtained
by calling mysql_stmt_errno() and mysql_stmt_error().
*/
}
else if (MYSQL_NO_DATA == rc)
{
/*
No more rows/data exists
*/
}
else if (MYSQL_DATA_TRUNCATED == rc)
{
/* Data truncation occurred */
/*
MYSQL_DATA_TRUNCATED is returned when truncation
reporting is enabled. To determine which column values
were truncated when this value is returned, check the
error members of the MYSQL_BIND structures used for
fetching values. Truncation reporting is enabled by
default, but can be controlled by calling
mysql_options() with the MYSQL_REPORT_DATA_TRUNCATION
option.
*/
}
return tupleSlot;
}
/*
* mysqlExplainForeignScan: Produce extra output for EXPLAIN
*/
static void
mysqlExplainForeignScan(ForeignScanState *node, ExplainState *es)
{
MySQLFdwExecState *festate = (MySQLFdwExecState *) node->fdw_state;
mysql_opt *options;
/* Fetch options */
options = mysql_get_options(RelationGetRelid(node->ss.ss_currentRelation));
/* Give some possibly useful info about startup costs */
if (es->verbose)
{
if (strcmp(options->svr_address, "127.0.0.1") == 0 || strcmp(options->svr_address, "localhost") == 0)
#if PG_VERSION_NUM >= 110000
ExplainPropertyInteger("Local server startup cost", NULL, 10, es);
#else
ExplainPropertyLong("Local server startup cost", 10, es);
#endif
else
#if PG_VERSION_NUM >= 110000
ExplainPropertyInteger("Remote server startup cost", NULL, 25, es);
#else
ExplainPropertyLong("Remote server startup cost", 25, es);
#endif
ExplainPropertyText("Remote query", festate->query, es);
}
}
/*
* mysqlEndForeignScan: Finish scanning foreign table and dispose
* objects used for this scan
*/
static void
mysqlEndForeignScan(ForeignScanState *node)
{
MySQLFdwExecState *festate = (MySQLFdwExecState *) node->fdw_state;
if (festate->table)
{
if (festate->table->_mysql_res) {
_mysql_free_result(festate->table->_mysql_res);
festate->table->_mysql_res = NULL;
}
}
if (festate->stmt)
{
_mysql_stmt_close(festate->stmt);
festate->stmt = NULL;
}
}
/*
* mysqlReScanForeignScan: Rescan table, possibly with new parameters
*/
static void
mysqlReScanForeignScan(ForeignScanState *node)
{
MySQLFdwExecState *festate = (MySQLFdwExecState *) node->fdw_state;
if (_mysql_stmt_execute(festate->stmt) != 0)
{
switch(_mysql_stmt_errno(festate->stmt))
{
case CR_NO_ERROR:
break;
case CR_OUT_OF_MEMORY:
case CR_SERVER_GONE_ERROR:
case CR_SERVER_LOST:
{
char *err = pstrdup(_mysql_error(festate->conn));
mysql_rel_connection(festate->conn);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
break;
case CR_COMMANDS_OUT_OF_SYNC:
case CR_UNKNOWN_ERROR:
default:
{
char *err = pstrdup(_mysql_error(festate->conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
break;
}
}
return;
}
/*
* mysqlGetForeignRelSize: Create a FdwPlan for a scan on the foreign table
*/
static void
mysqlGetForeignRelSize(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid)
{
StringInfoData sql;
double rows = 0;
double filtered = 0;
MYSQL *conn = NULL;
MYSQL_RES *result = NULL;
MYSQL_ROW row;
Bitmapset *attrs_used = NULL;
List *retrieved_attrs = NULL;
mysql_opt *options = NULL;
Oid userid = GetUserId();
ForeignServer *server;
UserMapping *user;
ForeignTable *table;
MySQLFdwRelationInfo *fpinfo;
ListCell *lc;
MYSQL_FIELD *field;
int i;
int num_fields;
List *params_list = NULL;
fpinfo = (MySQLFdwRelationInfo *) palloc0(sizeof(MySQLFdwRelationInfo));
baserel->fdw_private = (void *) fpinfo;
table = GetForeignTable(foreigntableid);
server = GetForeignServer(table->serverid);
user = GetUserMapping(userid, server->serverid);
/* Fetch options */
options = mysql_get_options(foreigntableid);
/* Connect to the server */
conn = mysql_get_connection(server, user, options);
_mysql_query(conn, "SET sql_mode='ANSI_QUOTES'");
#if PG_VERSION_NUM >= 90600
pull_varattnos((Node *) baserel->reltarget->exprs, baserel->relid, &attrs_used);
#else
pull_varattnos((Node *) baserel->reltargetlist, baserel->relid, &attrs_used);
#endif
foreach(lc, baserel->baserestrictinfo)
{
RestrictInfo *ri = (RestrictInfo *) lfirst(lc);
if (is_foreign_expr(root, baserel, ri->clause))
fpinfo->remote_conds = lappend(fpinfo->remote_conds, ri);
else
fpinfo->local_conds = lappend(fpinfo->local_conds, ri);
}
#if PG_VERSION_NUM >= 90600
pull_varattnos((Node *) baserel->reltarget->exprs, baserel->relid, &fpinfo->attrs_used);
#else
pull_varattnos((Node *) baserel->reltargetlist, baserel->relid, &fpinfo->attrs_used);
#endif
foreach(lc, fpinfo->local_conds)
{
RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
pull_varattnos((Node *) rinfo->clause, baserel->relid, &fpinfo->attrs_used);
}
if (options->use_remote_estimate)
{
initStringInfo(&sql);
appendStringInfo(&sql, "EXPLAIN ");
mysql_deparse_select(&sql, root, baserel, fpinfo->attrs_used, options->svr_table, &retrieved_attrs);
if (fpinfo->remote_conds)
mysql_append_where_clause(&sql, root, baserel, fpinfo->remote_conds,
true, ¶ms_list);
if (_mysql_query(conn, sql.data) != 0)
{
switch(_mysql_errno(conn))
{
case CR_NO_ERROR:
break;
case CR_OUT_OF_MEMORY:
case CR_SERVER_GONE_ERROR:
case CR_SERVER_LOST:
case CR_UNKNOWN_ERROR:
{
char *err = pstrdup(_mysql_error(conn));
mysql_rel_connection(conn);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
break;
case CR_COMMANDS_OUT_OF_SYNC:
default:
{
char *err = pstrdup(_mysql_error(conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
}
}
result = _mysql_store_result(conn);
if (result)
{
/*
* MySQL provide numbers of rows per table invole in
* the statment, but we don't have problem with it
* because we are sending separate query per table
* in FDW.
*/
row = _mysql_fetch_row(result);
num_fields = _mysql_num_fields(result);
if (row)
{
for (i = 0; i < num_fields; i++)
{
field = _mysql_fetch_field(result);
if (strcmp(field->name, "rows") == 0)
{
if (row[i])
rows = atof(row[i]);
}
else if (strcmp(field->name, "filtered") == 0)
{
if (row[i])
filtered = atof(row[i]);
}
}
}
_mysql_free_result(result);
}
}
if (rows > 0)
rows = ((rows + 1) * filtered) / 100;
else
rows = DEFAULTE_NUM_ROWS;
baserel->rows = rows;
baserel->tuples = rows;
}
static bool
mysql_is_column_unique(Oid foreigntableid)
{
StringInfoData sql;
MYSQL *conn = NULL;
MYSQL_RES *result = NULL;
MYSQL_ROW row;
mysql_opt *options = NULL;
Oid userid = GetUserId();
ForeignServer *server;
UserMapping *user;
ForeignTable *table;
table = GetForeignTable(foreigntableid);
server = GetForeignServer(table->serverid);
user = GetUserMapping(userid, server->serverid);
/* Fetch the options */
options = mysql_get_options(foreigntableid);
/* Connect to the server */
conn = mysql_get_connection(server, user, options);
/* Build the query */
initStringInfo(&sql);
appendStringInfo(&sql, "EXPLAIN %s", options->svr_table);
if (_mysql_query(conn, sql.data) != 0)
{
switch(_mysql_errno(conn))
{
case CR_NO_ERROR:
break;
case CR_OUT_OF_MEMORY:
case CR_SERVER_GONE_ERROR:
case CR_SERVER_LOST:
case CR_UNKNOWN_ERROR:
{
char *err = pstrdup(_mysql_error(conn));
mysql_rel_connection(conn);
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
break;
case CR_COMMANDS_OUT_OF_SYNC:
default:
{
char *err = pstrdup(_mysql_error(conn));
ereport(ERROR,
(errcode(ERRCODE_FDW_UNABLE_TO_CREATE_EXECUTION),
errmsg("failed to execute the MySQL query: \n%s", err)));
}
}
}
result = _mysql_store_result(conn);