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postgresql/contrib/dblink/dblink.c
Joe Conway db02073305 Fix dblink_get_result() as reported by Oleksiy Shchukin. Refactor a bit 
while we're at it per request by Tom Lane. Specifically, don't try to
perform dblink_send_query() via dblink_record_internal() -- it was
inappropriate and ugly.
2009-06-02 03:21:56 +00:00

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/*
* dblink.c
*
* Functions returning results from a remote database
*
* Joe Conway <mail@joeconway.com>
* And contributors:
* Darko Prenosil <Darko.Prenosil@finteh.hr>
* Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
*
* $PostgreSQL: pgsql/contrib/dblink/dblink.c,v 1.78 2009/06/02 03:21:56 joe Exp $
* Copyright (c) 2001-2009, PostgreSQL Global Development Group
* ALL RIGHTS RESERVED;
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without a written agreement
* is hereby granted, provided that the above copyright notice and this
* paragraph and the following two paragraphs appear in all copies.
*
* IN NO EVENT SHALL THE AUTHOR OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
* DOCUMENTATION, EVEN IF THE AUTHOR OR DISTRIBUTORS HAVE BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHOR AND DISTRIBUTORS SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE AUTHOR AND DISTRIBUTORS HAS NO OBLIGATIONS TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
*/
#include "postgres.h"
#include <limits.h>
#include "libpq-fe.h"
#include "fmgr.h"
#include "funcapi.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/tupdesc.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/pg_index.h"
#include "catalog/pg_type.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "nodes/execnodes.h"
#include "nodes/nodes.h"
#include "nodes/pg_list.h"
#include "parser/parse_type.h"
#include "utils/acl.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/dynahash.h"
#include "utils/fmgroids.h"
#include "utils/hsearch.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/syscache.h"
#include "utils/tqual.h"
#include "dblink.h"
PG_MODULE_MAGIC;
typedef struct remoteConn
{
PGconn *conn; /* Hold the remote connection */
int openCursorCount; /* The number of open cursors */
bool newXactForCursor; /* Opened a transaction for a cursor */
} remoteConn;
/*
* Internal declarations
*/
static Datum dblink_record_internal(FunctionCallInfo fcinfo, bool is_async);
static remoteConn *getConnectionByName(const char *name);
static HTAB *createConnHash(void);
static void createNewConnection(const char *name, remoteConn * rconn);
static void deleteConnection(const char *name);
static char **get_pkey_attnames(Oid relid, int16 *numatts);
static char **get_text_array_contents(ArrayType *array, int *numitems);
static char *get_sql_insert(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
static char *get_sql_delete(Oid relid, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals);
static char *get_sql_update(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
static char *quote_literal_cstr(char *rawstr);
static char *quote_ident_cstr(char *rawstr);
static int16 get_attnum_pk_pos(int2vector *pkattnums, int16 pknumatts, int16 key);
static HeapTuple get_tuple_of_interest(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals);
static Oid get_relid_from_relname(text *relname_text);
static char *generate_relation_name(Oid relid);
static void dblink_connstr_check(const char *connstr);
static void dblink_security_check(PGconn *conn, remoteConn *rconn);
static void dblink_res_error(const char *conname, PGresult *res, const char *dblink_context_msg, bool fail);
/* Global */
static remoteConn *pconn = NULL;
static HTAB *remoteConnHash = NULL;
/*
* Following is list that holds multiple remote connections.
* Calling convention of each dblink function changes to accept
* connection name as the first parameter. The connection list is
* much like ecpg e.g. a mapping between a name and a PGconn object.
*/
typedef struct remoteConnHashEnt
{
char name[NAMEDATALEN];
remoteConn *rconn;
} remoteConnHashEnt;
/* initial number of connection hashes */
#define NUMCONN 16
/* general utility */
#define xpfree(var_) \
do { \
if (var_ != NULL) \
{ \
pfree(var_); \
var_ = NULL; \
} \
} while (0)
#define xpstrdup(var_c, var_) \
do { \
if (var_ != NULL) \
var_c = pstrdup(var_); \
else \
var_c = NULL; \
} while (0)
#define DBLINK_RES_INTERNALERROR(p2) \
do { \
msg = pstrdup(PQerrorMessage(conn)); \
if (res) \
PQclear(res); \
elog(ERROR, "%s: %s", p2, msg); \
} while (0)
#define DBLINK_CONN_NOT_AVAIL \
do { \
if(conname) \
ereport(ERROR, \
(errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST), \
errmsg("connection \"%s\" not available", conname))); \
else \
ereport(ERROR, \
(errcode(ERRCODE_CONNECTION_DOES_NOT_EXIST), \
errmsg("connection not available"))); \
} while (0)
#define DBLINK_GET_CONN \
do { \
char *conname_or_str = text_to_cstring(PG_GETARG_TEXT_PP(0)); \
rconn = getConnectionByName(conname_or_str); \
if(rconn) \
{ \
conn = rconn->conn; \
} \
else \
{ \
connstr = conname_or_str; \
dblink_connstr_check(connstr); \
conn = PQconnectdb(connstr); \
if (PQstatus(conn) == CONNECTION_BAD) \
{ \
msg = pstrdup(PQerrorMessage(conn)); \
PQfinish(conn); \
ereport(ERROR, \
(errcode(ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION), \
errmsg("could not establish connection"), \
errdetail("%s", msg))); \
} \
dblink_security_check(conn, rconn); \
freeconn = true; \
} \
} while (0)
#define DBLINK_GET_NAMED_CONN \
do { \
char *conname = text_to_cstring(PG_GETARG_TEXT_PP(0)); \
rconn = getConnectionByName(conname); \
if(rconn) \
conn = rconn->conn; \
else \
DBLINK_CONN_NOT_AVAIL; \
} while (0)
#define DBLINK_INIT \
do { \
if (!pconn) \
{ \
pconn = (remoteConn *) MemoryContextAlloc(TopMemoryContext, sizeof(remoteConn)); \
pconn->conn = NULL; \
pconn->openCursorCount = 0; \
pconn->newXactForCursor = FALSE; \
} \
} while (0)
/*
* Create a persistent connection to another database
*/
PG_FUNCTION_INFO_V1(dblink_connect);
Datum
dblink_connect(PG_FUNCTION_ARGS)
{
char *connstr = NULL;
char *connname = NULL;
char *msg;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
DBLINK_INIT;
if (PG_NARGS() == 2)
{
connstr = text_to_cstring(PG_GETARG_TEXT_PP(1));
connname = text_to_cstring(PG_GETARG_TEXT_PP(0));
}
else if (PG_NARGS() == 1)
connstr = text_to_cstring(PG_GETARG_TEXT_PP(0));
if (connname)
rconn = (remoteConn *) MemoryContextAlloc(TopMemoryContext,
sizeof(remoteConn));
/* check password in connection string if not superuser */
dblink_connstr_check(connstr);
conn = PQconnectdb(connstr);
if (PQstatus(conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(conn));
PQfinish(conn);
if (rconn)
pfree(rconn);
ereport(ERROR,
(errcode(ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION),
errmsg("could not establish connection"),
errdetail("%s", msg)));
}
/* check password actually used if not superuser */
dblink_security_check(conn, rconn);
if (connname)
{
rconn->conn = conn;
createNewConnection(connname, rconn);
}
else
pconn->conn = conn;
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
/*
* Clear a persistent connection to another database
*/
PG_FUNCTION_INFO_V1(dblink_disconnect);
Datum
dblink_disconnect(PG_FUNCTION_ARGS)
{
char *conname = NULL;
remoteConn *rconn = NULL;
PGconn *conn = NULL;
DBLINK_INIT;
if (PG_NARGS() == 1)
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
rconn = getConnectionByName(conname);
if (rconn)
conn = rconn->conn;
}
else
conn = pconn->conn;
if (!conn)
DBLINK_CONN_NOT_AVAIL;
PQfinish(conn);
if (rconn)
{
deleteConnection(conname);
pfree(rconn);
}
else
pconn->conn = NULL;
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
/*
* opens a cursor using a persistent connection
*/
PG_FUNCTION_INFO_V1(dblink_open);
Datum
dblink_open(PG_FUNCTION_ARGS)
{
char *msg;
PGresult *res = NULL;
PGconn *conn = NULL;
char *curname = NULL;
char *sql = NULL;
char *conname = NULL;
StringInfoData buf;
remoteConn *rconn = NULL;
bool fail = true; /* default to backward compatible behavior */
DBLINK_INIT;
initStringInfo(&buf);
if (PG_NARGS() == 2)
{
/* text,text */
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
rconn = pconn;
}
else if (PG_NARGS() == 3)
{
/* might be text,text,text or text,text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 2) == BOOLOID)
{
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
rconn = pconn;
}
else
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
sql = text_to_cstring(PG_GETARG_TEXT_PP(2));
rconn = getConnectionByName(conname);
}
}
else if (PG_NARGS() == 4)
{
/* text,text,text,bool */
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
sql = text_to_cstring(PG_GETARG_TEXT_PP(2));
fail = PG_GETARG_BOOL(3);
rconn = getConnectionByName(conname);
}
if (!rconn || !rconn->conn)
DBLINK_CONN_NOT_AVAIL;
else
conn = rconn->conn;
/* If we are not in a transaction, start one */
if (PQtransactionStatus(conn) == PQTRANS_IDLE)
{
res = PQexec(conn, "BEGIN");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
DBLINK_RES_INTERNALERROR("begin error");
PQclear(res);
rconn->newXactForCursor = TRUE;
/*
* Since transaction state was IDLE, we force cursor count to
* initially be 0. This is needed as a previous ABORT might have wiped
* out our transaction without maintaining the cursor count for us.
*/
rconn->openCursorCount = 0;
}
/* if we started a transaction, increment cursor count */
if (rconn->newXactForCursor)
(rconn->openCursorCount)++;
appendStringInfo(&buf, "DECLARE %s CURSOR FOR %s", curname, sql);
res = PQexec(conn, buf.data);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
dblink_res_error(conname, res, "could not open cursor", fail);
PG_RETURN_TEXT_P(cstring_to_text("ERROR"));
}
PQclear(res);
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
/*
* closes a cursor
*/
PG_FUNCTION_INFO_V1(dblink_close);
Datum
dblink_close(PG_FUNCTION_ARGS)
{
PGconn *conn = NULL;
PGresult *res = NULL;
char *curname = NULL;
char *conname = NULL;
StringInfoData buf;
char *msg;
remoteConn *rconn = NULL;
bool fail = true; /* default to backward compatible behavior */
DBLINK_INIT;
initStringInfo(&buf);
if (PG_NARGS() == 1)
{
/* text */
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
rconn = pconn;
}
else if (PG_NARGS() == 2)
{
/* might be text,text or text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
{
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
fail = PG_GETARG_BOOL(1);
rconn = pconn;
}
else
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
rconn = getConnectionByName(conname);
}
}
if (PG_NARGS() == 3)
{
/* text,text,bool */
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
rconn = getConnectionByName(conname);
}
if (!rconn || !rconn->conn)
DBLINK_CONN_NOT_AVAIL;
else
conn = rconn->conn;
appendStringInfo(&buf, "CLOSE %s", curname);
/* close the cursor */
res = PQexec(conn, buf.data);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
dblink_res_error(conname, res, "could not close cursor", fail);
PG_RETURN_TEXT_P(cstring_to_text("ERROR"));
}
PQclear(res);
/* if we started a transaction, decrement cursor count */
if (rconn->newXactForCursor)
{
(rconn->openCursorCount)--;
/* if count is zero, commit the transaction */
if (rconn->openCursorCount == 0)
{
rconn->newXactForCursor = FALSE;
res = PQexec(conn, "COMMIT");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
DBLINK_RES_INTERNALERROR("commit error");
PQclear(res);
}
}
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
/*
* Fetch results from an open cursor
*/
PG_FUNCTION_INFO_V1(dblink_fetch);
Datum
dblink_fetch(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
TupleDesc tupdesc = NULL;
int call_cntr;
int max_calls;
AttInMetadata *attinmeta;
PGresult *res = NULL;
MemoryContext oldcontext;
char *conname = NULL;
remoteConn *rconn = NULL;
DBLINK_INIT;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
PGconn *conn = NULL;
StringInfoData buf;
char *curname = NULL;
int howmany = 0;
bool fail = true; /* default to backward compatible */
if (PG_NARGS() == 4)
{
/* text,text,int,bool */
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
howmany = PG_GETARG_INT32(2);
fail = PG_GETARG_BOOL(3);
rconn = getConnectionByName(conname);
if (rconn)
conn = rconn->conn;
}
else if (PG_NARGS() == 3)
{
/* text,text,int or text,int,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 2) == BOOLOID)
{
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
howmany = PG_GETARG_INT32(1);
fail = PG_GETARG_BOOL(2);
conn = pconn->conn;
}
else
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
howmany = PG_GETARG_INT32(2);
rconn = getConnectionByName(conname);
if (rconn)
conn = rconn->conn;
}
}
else if (PG_NARGS() == 2)
{
/* text,int */
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
howmany = PG_GETARG_INT32(1);
conn = pconn->conn;
}
if (!conn)
DBLINK_CONN_NOT_AVAIL;
initStringInfo(&buf);
appendStringInfo(&buf, "FETCH %d FROM %s", howmany, curname);
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* Try to execute the query. Note that since libpq uses malloc,
* the PGresult will be long-lived even though we are still in
* a short-lived memory context.
*/
res = PQexec(conn, buf.data);
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
dblink_res_error(conname, res, "could not fetch from cursor", fail);
SRF_RETURN_DONE(funcctx);
}
else if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
/* cursor does not exist - closed already or bad name */
PQclear(res);
ereport(ERROR,
(errcode(ERRCODE_INVALID_CURSOR_NAME),
errmsg("cursor \"%s\" does not exist", curname)));
}
funcctx->max_calls = PQntuples(res);
/* got results, keep track of them */
funcctx->user_fctx = res;
/* get a tuple descriptor for our result type */
switch (get_call_result_type(fcinfo, NULL, &tupdesc))
{
case TYPEFUNC_COMPOSITE:
/* success */
break;
case TYPEFUNC_RECORD:
/* failed to determine actual type of RECORD */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
break;
default:
/* result type isn't composite */
elog(ERROR, "return type must be a row type");
break;
}
/* check result and tuple descriptor have the same number of columns */
if (PQnfields(res) != tupdesc->natts)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("remote query result rowtype does not match "
"the specified FROM clause rowtype")));
/*
* fast track when no results. We could exit earlier, but then
* we'd not report error if the result tuple type is wrong.
*/
if (funcctx->max_calls < 1)
{
PQclear(res);
SRF_RETURN_DONE(funcctx);
}
/*
* switch to memory context appropriate for multiple function calls,
* so we can make long-lived copy of tupdesc etc
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* make sure we have a persistent copy of the tupdesc */
tupdesc = CreateTupleDescCopy(tupdesc);
/* store needed metadata for subsequent calls */
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
/*
* initialize per-call variables
*/
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
res = (PGresult *) funcctx->user_fctx;
attinmeta = funcctx->attinmeta;
tupdesc = attinmeta->tupdesc;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char **values;
HeapTuple tuple;
Datum result;
int i;
int nfields = PQnfields(res);
values = (char **) palloc(nfields * sizeof(char *));
for (i = 0; i < nfields; i++)
{
if (PQgetisnull(res, call_cntr, i) == 0)
values[i] = PQgetvalue(res, call_cntr, i);
else
values[i] = NULL;
}
/* build the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
{
/* do when there is no more left */
PQclear(res);
SRF_RETURN_DONE(funcctx);
}
}
/*
* Note: this is the new preferred version of dblink
*/
PG_FUNCTION_INFO_V1(dblink_record);
Datum
dblink_record(PG_FUNCTION_ARGS)
{
return dblink_record_internal(fcinfo, false);
}
PG_FUNCTION_INFO_V1(dblink_send_query);
Datum
dblink_send_query(PG_FUNCTION_ARGS)
{
PGconn *conn = NULL;
char *connstr = NULL;
char *sql = NULL;
remoteConn *rconn = NULL;
char *msg;
bool freeconn = false;
int retval;
if (PG_NARGS() == 2)
{
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
/* async query send */
retval = PQsendQuery(conn, sql);
if (retval != 1)
elog(NOTICE, "%s", PQerrorMessage(conn));
PG_RETURN_INT32(retval);
}
PG_FUNCTION_INFO_V1(dblink_get_result);
Datum
dblink_get_result(PG_FUNCTION_ARGS)
{
return dblink_record_internal(fcinfo, true);
}
static Datum
dblink_record_internal(FunctionCallInfo fcinfo, bool is_async)
{
FuncCallContext *funcctx;
TupleDesc tupdesc = NULL;
int call_cntr;
int max_calls;
AttInMetadata *attinmeta;
char *msg;
PGresult *res = NULL;
bool is_sql_cmd = false;
char *sql_cmd_status = NULL;
MemoryContext oldcontext;
bool freeconn = false;
DBLINK_INIT;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
PGconn *conn = NULL;
char *connstr = NULL;
char *sql = NULL;
char *conname = NULL;
remoteConn *rconn = NULL;
bool fail = true; /* default to backward compatible */
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
if (!is_async)
{
if (PG_NARGS() == 3)
{
/* text,text,bool */
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
}
else if (PG_NARGS() == 2)
{
/* text,text or text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
{
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
fail = PG_GETARG_BOOL(1);
}
else
{
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
}
}
else if (PG_NARGS() == 1)
{
/* text */
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
}
else /* is_async */
{
/* get async result */
if (PG_NARGS() == 2)
{
/* text,bool */
DBLINK_GET_CONN;
fail = PG_GETARG_BOOL(1);
}
else if (PG_NARGS() == 1)
{
/* text */
DBLINK_GET_CONN;
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
}
if (!conn)
DBLINK_CONN_NOT_AVAIL;
/* synchronous query, or async result retrieval */
if (!is_async)
res = PQexec(conn, sql);
else
{
res = PQgetResult(conn);
/* NULL means we're all done with the async results */
if (!res)
{
MemoryContextSwitchTo(oldcontext);
SRF_RETURN_DONE(funcctx);
}
}
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
dblink_res_error(conname, res, "could not execute query", fail);
if (freeconn)
PQfinish(conn);
MemoryContextSwitchTo(oldcontext);
SRF_RETURN_DONE(funcctx);
}
if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
is_sql_cmd = true;
/* need a tuple descriptor representing one TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
TEXTOID, -1, 0);
/*
* and save a copy of the command status string to return as
* our result tuple
*/
sql_cmd_status = PQcmdStatus(res);
funcctx->max_calls = 1;
}
else
funcctx->max_calls = PQntuples(res);
/* got results, keep track of them */
funcctx->user_fctx = res;
/* if needed, close the connection to the database and cleanup */
if (freeconn)
PQfinish(conn);
if (!is_sql_cmd)
{
/* get a tuple descriptor for our result type */
switch (get_call_result_type(fcinfo, NULL, &tupdesc))
{
case TYPEFUNC_COMPOSITE:
/* success */
break;
case TYPEFUNC_RECORD:
/* failed to determine actual type of RECORD */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
break;
default:
/* result type isn't composite */
elog(ERROR, "return type must be a row type");
break;
}
/* make sure we have a persistent copy of the tupdesc */
tupdesc = CreateTupleDescCopy(tupdesc);
}
/*
* check result and tuple descriptor have the same number of
* columns
*/
if (PQnfields(res) != tupdesc->natts)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("remote query result rowtype does not match "
"the specified FROM clause rowtype")));
/* fast track when no results */
if (funcctx->max_calls < 1)
{
if (res)
PQclear(res);
MemoryContextSwitchTo(oldcontext);
SRF_RETURN_DONE(funcctx);
}
/* store needed metadata for subsequent calls */
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
/*
* initialize per-call variables
*/
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
res = (PGresult *) funcctx->user_fctx;
attinmeta = funcctx->attinmeta;
tupdesc = attinmeta->tupdesc;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char **values;
HeapTuple tuple;
Datum result;
if (!is_sql_cmd)
{
int i;
int nfields = PQnfields(res);
values = (char **) palloc(nfields * sizeof(char *));
for (i = 0; i < nfields; i++)
{
if (PQgetisnull(res, call_cntr, i) == 0)
values[i] = PQgetvalue(res, call_cntr, i);
else
values[i] = NULL;
}
}
else
{
values = (char **) palloc(1 * sizeof(char *));
values[0] = sql_cmd_status;
}
/* build the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
{
/* do when there is no more left */
PQclear(res);
SRF_RETURN_DONE(funcctx);
}
}
/*
* List all open dblink connections by name.
* Returns an array of all connection names.
* Takes no params
*/
PG_FUNCTION_INFO_V1(dblink_get_connections);
Datum
dblink_get_connections(PG_FUNCTION_ARGS)
{
HASH_SEQ_STATUS status;
remoteConnHashEnt *hentry;
ArrayBuildState *astate = NULL;
if (remoteConnHash)
{
hash_seq_init(&status, remoteConnHash);
while ((hentry = (remoteConnHashEnt *) hash_seq_search(&status)) != NULL)
{
/* stash away current value */
astate = accumArrayResult(astate,
CStringGetTextDatum(hentry->name),
false, TEXTOID, CurrentMemoryContext);
}
}
if (astate)
PG_RETURN_ARRAYTYPE_P(makeArrayResult(astate,
CurrentMemoryContext));
else
PG_RETURN_NULL();
}
/*
* Checks if a given remote connection is busy
*
* Returns 1 if the connection is busy, 0 otherwise
* Params:
* text connection_name - name of the connection to check
*
*/
PG_FUNCTION_INFO_V1(dblink_is_busy);
Datum
dblink_is_busy(PG_FUNCTION_ARGS)
{
PGconn *conn = NULL;
remoteConn *rconn = NULL;
DBLINK_INIT;
DBLINK_GET_NAMED_CONN;
PQconsumeInput(conn);
PG_RETURN_INT32(PQisBusy(conn));
}
/*
* Cancels a running request on a connection
*
* Returns text:
* "OK" if the cancel request has been sent correctly,
* an error message otherwise
*
* Params:
* text connection_name - name of the connection to check
*
*/
PG_FUNCTION_INFO_V1(dblink_cancel_query);
Datum
dblink_cancel_query(PG_FUNCTION_ARGS)
{
int res = 0;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
PGcancel *cancel;
char errbuf[256];
DBLINK_INIT;
DBLINK_GET_NAMED_CONN;
cancel = PQgetCancel(conn);
res = PQcancel(cancel, errbuf, 256);
PQfreeCancel(cancel);
if (res == 1)
PG_RETURN_TEXT_P(cstring_to_text("OK"));
else
PG_RETURN_TEXT_P(cstring_to_text(errbuf));
}
/*
* Get error message from a connection
*
* Returns text:
* "OK" if no error, an error message otherwise
*
* Params:
* text connection_name - name of the connection to check
*
*/
PG_FUNCTION_INFO_V1(dblink_error_message);
Datum
dblink_error_message(PG_FUNCTION_ARGS)
{
char *msg;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
DBLINK_INIT;
DBLINK_GET_NAMED_CONN;
msg = PQerrorMessage(conn);
if (msg == NULL || msg[0] == '\0')
PG_RETURN_TEXT_P(cstring_to_text("OK"));
else
PG_RETURN_TEXT_P(cstring_to_text(msg));
}
/*
* Execute an SQL non-SELECT command
*/
PG_FUNCTION_INFO_V1(dblink_exec);
Datum
dblink_exec(PG_FUNCTION_ARGS)
{
char *msg;
PGresult *res = NULL;
text *sql_cmd_status = NULL;
TupleDesc tupdesc = NULL;
PGconn *conn = NULL;
char *connstr = NULL;
char *sql = NULL;
char *conname = NULL;
remoteConn *rconn = NULL;
bool freeconn = false;
bool fail = true; /* default to backward compatible behavior */
DBLINK_INIT;
if (PG_NARGS() == 3)
{
/* must be text,text,bool */
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
}
else if (PG_NARGS() == 2)
{
/* might be text,text or text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
{
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
fail = PG_GETARG_BOOL(1);
}
else
{
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
}
}
else if (PG_NARGS() == 1)
{
/* must be single text argument */
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
if (!conn)
DBLINK_CONN_NOT_AVAIL;
res = PQexec(conn, sql);
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
dblink_res_error(conname, res, "could not execute command", fail);
/* need a tuple descriptor representing one TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
TEXTOID, -1, 0);
/*
* and save a copy of the command status string to return as our
* result tuple
*/
sql_cmd_status = cstring_to_text("ERROR");
}
else if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
/* need a tuple descriptor representing one TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
TEXTOID, -1, 0);
/*
* and save a copy of the command status string to return as our
* result tuple
*/
sql_cmd_status = cstring_to_text(PQcmdStatus(res));
PQclear(res);
}
else
{
PQclear(res);
ereport(ERROR,
(errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("statement returning results not allowed")));
}
/* if needed, close the connection to the database and cleanup */
if (freeconn)
PQfinish(conn);
PG_RETURN_TEXT_P(sql_cmd_status);
}
/*
* dblink_get_pkey
*
* Return list of primary key fields for the supplied relation,
* or NULL if none exists.
*/
PG_FUNCTION_INFO_V1(dblink_get_pkey);
Datum
dblink_get_pkey(PG_FUNCTION_ARGS)
{
int16 numatts;
Oid relid;
char **results;
FuncCallContext *funcctx;
int32 call_cntr;
int32 max_calls;
AttInMetadata *attinmeta;
MemoryContext oldcontext;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
TupleDesc tupdesc = NULL;
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* convert relname to rel Oid */
relid = get_relid_from_relname(PG_GETARG_TEXT_P(0));
if (!OidIsValid(relid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_TABLE),
errmsg("relation \"%s\" does not exist",
text_to_cstring(PG_GETARG_TEXT_PP(0)))));
/*
* need a tuple descriptor representing one INT and one TEXT column
*/
tupdesc = CreateTemplateTupleDesc(2, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "position",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "colname",
TEXTOID, -1, 0);
/*
* Generate attribute metadata needed later to produce tuples from raw
* C strings
*/
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
/* get an array of attnums */
results = get_pkey_attnames(relid, &numatts);
if ((results != NULL) && (numatts > 0))
{
funcctx->max_calls = numatts;
/* got results, keep track of them */
funcctx->user_fctx = results;
}
else
{
/* fast track when no results */
MemoryContextSwitchTo(oldcontext);
SRF_RETURN_DONE(funcctx);
}
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
/*
* initialize per-call variables
*/
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
results = (char **) funcctx->user_fctx;
attinmeta = funcctx->attinmeta;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char **values;
HeapTuple tuple;
Datum result;
values = (char **) palloc(2 * sizeof(char *));
values[0] = (char *) palloc(12); /* sign, 10 digits, '\0' */
sprintf(values[0], "%d", call_cntr + 1);
values[1] = results[call_cntr];
/* build the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
{
/* do when there is no more left */
SRF_RETURN_DONE(funcctx);
}
}
/*
* dblink_build_sql_insert
*
* Used to generate an SQL insert statement
* based on an existing tuple in a local relation.
* This is useful for selectively replicating data
* to another server via dblink.
*
* API:
* <relname> - name of local table of interest
* <pkattnums> - an int2vector of attnums which will be used
* to identify the local tuple of interest
* <pknumatts> - number of attnums in pkattnums
* <src_pkattvals_arry> - text array of key values which will be used
* to identify the local tuple of interest
* <tgt_pkattvals_arry> - text array of key values which will be used
* to build the string for execution remotely. These are substituted
* for their counterparts in src_pkattvals_arry
*/
PG_FUNCTION_INFO_V1(dblink_build_sql_insert);
Datum
dblink_build_sql_insert(PG_FUNCTION_ARGS)
{
text *relname_text = PG_GETARG_TEXT_P(0);
int2vector *pkattnums = (int2vector *) PG_GETARG_POINTER(1);
int32 pknumatts_tmp = PG_GETARG_INT32(2);
ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
Oid relid;
int16 pknumatts = 0;
char **src_pkattvals;
char **tgt_pkattvals;
int src_nitems;
int tgt_nitems;
char *sql;
/*
* Convert relname to rel OID.
*/
relid = get_relid_from_relname(relname_text);
if (!OidIsValid(relid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_TABLE),
errmsg("relation \"%s\" does not exist",
text_to_cstring(relname_text))));
/*
* There should be at least one key attribute
*/
if (pknumatts_tmp <= 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("number of key attributes must be > 0")));
if (pknumatts_tmp <= SHRT_MAX)
pknumatts = pknumatts_tmp;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("input for number of primary key " \
"attributes too large")));
/*
* Source array is made up of key values that will be used to locate the
* tuple of interest from the local system.
*/
src_pkattvals = get_text_array_contents(src_pkattvals_arry, &src_nitems);
/*
* There should be one source array key value for each key attnum
*/
if (src_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("source key array length must match number of key " \
"attributes")));
/*
* Target array is made up of key values that will be used to build the
* SQL string for use on the remote system.
*/
tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("target key array length must match number of key " \
"attributes")));
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_insert(relid, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
/*
* And send it
*/
PG_RETURN_TEXT_P(cstring_to_text(sql));
}
/*
* dblink_build_sql_delete
*
* Used to generate an SQL delete statement.
* This is useful for selectively replicating a
* delete to another server via dblink.
*
* API:
* <relname> - name of remote table of interest
* <pkattnums> - an int2vector of attnums which will be used
* to identify the remote tuple of interest
* <pknumatts> - number of attnums in pkattnums
* <tgt_pkattvals_arry> - text array of key values which will be used
* to build the string for execution remotely.
*/
PG_FUNCTION_INFO_V1(dblink_build_sql_delete);
Datum
dblink_build_sql_delete(PG_FUNCTION_ARGS)
{
text *relname_text = PG_GETARG_TEXT_P(0);
int2vector *pkattnums = (int2vector *) PG_GETARG_POINTER(1);
int32 pknumatts_tmp = PG_GETARG_INT32(2);
ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
Oid relid;
int16 pknumatts = 0;
char **tgt_pkattvals;
int tgt_nitems;
char *sql;
/*
* Convert relname to rel OID.
*/
relid = get_relid_from_relname(relname_text);
if (!OidIsValid(relid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_TABLE),
errmsg("relation \"%s\" does not exist",
text_to_cstring(relname_text))));
/*
* There should be at least one key attribute
*/
if (pknumatts_tmp <= 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("number of key attributes must be > 0")));
if (pknumatts_tmp <= SHRT_MAX)
pknumatts = pknumatts_tmp;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("input for number of primary key " \
"attributes too large")));
/*
* Target array is made up of key values that will be used to build the
* SQL string for use on the remote system.
*/
tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("target key array length must match number of key " \
"attributes")));
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_delete(relid, pkattnums, pknumatts, tgt_pkattvals);
/*
* And send it
*/
PG_RETURN_TEXT_P(cstring_to_text(sql));
}
/*
* dblink_build_sql_update
*
* Used to generate an SQL update statement
* based on an existing tuple in a local relation.
* This is useful for selectively replicating data
* to another server via dblink.
*
* API:
* <relname> - name of local table of interest
* <pkattnums> - an int2vector of attnums which will be used
* to identify the local tuple of interest
* <pknumatts> - number of attnums in pkattnums
* <src_pkattvals_arry> - text array of key values which will be used
* to identify the local tuple of interest
* <tgt_pkattvals_arry> - text array of key values which will be used
* to build the string for execution remotely. These are substituted
* for their counterparts in src_pkattvals_arry
*/
PG_FUNCTION_INFO_V1(dblink_build_sql_update);
Datum
dblink_build_sql_update(PG_FUNCTION_ARGS)
{
text *relname_text = PG_GETARG_TEXT_P(0);
int2vector *pkattnums = (int2vector *) PG_GETARG_POINTER(1);
int32 pknumatts_tmp = PG_GETARG_INT32(2);
ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
Oid relid;
int16 pknumatts = 0;
char **src_pkattvals;
char **tgt_pkattvals;
int src_nitems;
int tgt_nitems;
char *sql;
/*
* Convert relname to rel OID.
*/
relid = get_relid_from_relname(relname_text);
if (!OidIsValid(relid))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_TABLE),
errmsg("relation \"%s\" does not exist",
text_to_cstring(relname_text))));
/*
* There should be one source array key values for each key attnum
*/
if (pknumatts_tmp <= 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("number of key attributes must be > 0")));
if (pknumatts_tmp <= SHRT_MAX)
pknumatts = pknumatts_tmp;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("input for number of primary key " \
"attributes too large")));
/*
* Source array is made up of key values that will be used to locate the
* tuple of interest from the local system.
*/
src_pkattvals = get_text_array_contents(src_pkattvals_arry, &src_nitems);
/*
* There should be one source array key value for each key attnum
*/
if (src_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("source key array length must match number of key " \
"attributes")));
/*
* Target array is made up of key values that will be used to build the
* SQL string for use on the remote system.
*/
tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("target key array length must match number of key " \
"attributes")));
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_update(relid, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
/*
* And send it
*/
PG_RETURN_TEXT_P(cstring_to_text(sql));
}
/*************************************************************
* internal functions
*/
/*
* get_pkey_attnames
*
* Get the primary key attnames for the given relation.
* Return NULL, and set numatts = 0, if no primary key exists.
*/
static char **
get_pkey_attnames(Oid relid, int16 *numatts)
{
Relation indexRelation;
ScanKeyData skey;
SysScanDesc scan;
HeapTuple indexTuple;
int i;
char **result = NULL;
Relation rel;
TupleDesc tupdesc;
AclResult aclresult;
/* initialize numatts to 0 in case no primary key exists */
*numatts = 0;
/* open relation using relid, check permissions, get tupdesc */
rel = relation_open(relid, AccessShareLock);
aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
ACL_SELECT);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_CLASS,
RelationGetRelationName(rel));
tupdesc = rel->rd_att;
/* Prepare to scan pg_index for entries having indrelid = this rel. */
indexRelation = heap_open(IndexRelationId, AccessShareLock);
ScanKeyInit(&skey,
Anum_pg_index_indrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(relid));
scan = systable_beginscan(indexRelation, IndexIndrelidIndexId, true,
SnapshotNow, 1, &skey);
while (HeapTupleIsValid(indexTuple = systable_getnext(scan)))
{
Form_pg_index index = (Form_pg_index) GETSTRUCT(indexTuple);
/* we're only interested if it is the primary key */
if (index->indisprimary)
{
*numatts = index->indnatts;
if (*numatts > 0)
{
result = (char **) palloc(*numatts * sizeof(char *));
for (i = 0; i < *numatts; i++)
result[i] = SPI_fname(tupdesc, index->indkey.values[i]);
}
break;
}
}
systable_endscan(scan);
heap_close(indexRelation, AccessShareLock);
relation_close(rel, AccessShareLock);
return result;
}
/*
* Deconstruct a text[] into C-strings (note any NULL elements will be
* returned as NULL pointers)
*/
static char **
get_text_array_contents(ArrayType *array, int *numitems)
{
int ndim = ARR_NDIM(array);
int *dims = ARR_DIMS(array);
int nitems;
int16 typlen;
bool typbyval;
char typalign;
char **values;
char *ptr;
bits8 *bitmap;
int bitmask;
int i;
Assert(ARR_ELEMTYPE(array) == TEXTOID);
*numitems = nitems = ArrayGetNItems(ndim, dims);
get_typlenbyvalalign(ARR_ELEMTYPE(array),
&typlen, &typbyval, &typalign);
values = (char **) palloc(nitems * sizeof(char *));
ptr = ARR_DATA_PTR(array);
bitmap = ARR_NULLBITMAP(array);
bitmask = 1;
for (i = 0; i < nitems; i++)
{
if (bitmap && (*bitmap & bitmask) == 0)
{
values[i] = NULL;
}
else
{
values[i] = TextDatumGetCString(PointerGetDatum(ptr));
ptr = att_addlength_pointer(ptr, typlen, ptr);
ptr = (char *) att_align_nominal(ptr, typalign);
}
/* advance bitmap pointer if any */
if (bitmap)
{
bitmask <<= 1;
if (bitmask == 0x100)
{
bitmap++;
bitmask = 1;
}
}
}
return values;
}
static char *
get_sql_insert(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
{
Relation rel;
char *relname;
HeapTuple tuple;
TupleDesc tupdesc;
int natts;
StringInfoData buf;
char *val;
int16 key;
int i;
bool needComma;
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(relid);
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
tuple = get_tuple_of_interest(relid, pkattnums, pknumatts, src_pkattvals);
if (!tuple)
ereport(ERROR,
(errcode(ERRCODE_CARDINALITY_VIOLATION),
errmsg("source row not found")));
appendStringInfo(&buf, "INSERT INTO %s(", relname);
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(&buf, ",");
appendStringInfoString(&buf,
quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
needComma = true;
}
appendStringInfo(&buf, ") VALUES(");
/*
* remember attvals are 1 based
*/
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(&buf, ",");
if (tgt_pkattvals != NULL)
key = get_attnum_pk_pos(pkattnums, pknumatts, i + 1);
else
key = -1;
if (key > -1)
val = tgt_pkattvals[key] ? pstrdup(tgt_pkattvals[key]) : NULL;
else
val = SPI_getvalue(tuple, tupdesc, i + 1);
if (val != NULL)
{
appendStringInfoString(&buf, quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(&buf, "NULL");
needComma = true;
}
appendStringInfo(&buf, ")");
relation_close(rel, AccessShareLock);
return (buf.data);
}
static char *
get_sql_delete(Oid relid, int2vector *pkattnums, int16 pknumatts, char **tgt_pkattvals)
{
Relation rel;
char *relname;
TupleDesc tupdesc;
int natts;
StringInfoData buf;
int i;
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(relid);
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
appendStringInfo(&buf, "DELETE FROM %s WHERE ", relname);
for (i = 0; i < pknumatts; i++)
{
int16 pkattnum = pkattnums->values[i];
if (i > 0)
appendStringInfo(&buf, " AND ");
appendStringInfoString(&buf,
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
if (tgt_pkattvals == NULL)
/* internal error */
elog(ERROR, "target key array must not be NULL");
if (tgt_pkattvals[i] != NULL)
appendStringInfo(&buf, " = %s",
quote_literal_cstr(tgt_pkattvals[i]));
else
appendStringInfo(&buf, " IS NULL");
}
relation_close(rel, AccessShareLock);
return (buf.data);
}
static char *
get_sql_update(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
{
Relation rel;
char *relname;
HeapTuple tuple;
TupleDesc tupdesc;
int natts;
StringInfoData buf;
char *val;
int16 key;
int i;
bool needComma;
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(relid);
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
tuple = get_tuple_of_interest(relid, pkattnums, pknumatts, src_pkattvals);
if (!tuple)
ereport(ERROR,
(errcode(ERRCODE_CARDINALITY_VIOLATION),
errmsg("source row not found")));
appendStringInfo(&buf, "UPDATE %s SET ", relname);
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(&buf, ", ");
appendStringInfo(&buf, "%s = ",
quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
if (tgt_pkattvals != NULL)
key = get_attnum_pk_pos(pkattnums, pknumatts, i + 1);
else
key = -1;
if (key > -1)
val = tgt_pkattvals[key] ? pstrdup(tgt_pkattvals[key]) : NULL;
else
val = SPI_getvalue(tuple, tupdesc, i + 1);
if (val != NULL)
{
appendStringInfoString(&buf, quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfoString(&buf, "NULL");
needComma = true;
}
appendStringInfo(&buf, " WHERE ");
for (i = 0; i < pknumatts; i++)
{
int16 pkattnum = pkattnums->values[i];
if (i > 0)
appendStringInfo(&buf, " AND ");
appendStringInfo(&buf, "%s",
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
if (tgt_pkattvals != NULL)
val = tgt_pkattvals[i] ? pstrdup(tgt_pkattvals[i]) : NULL;
else
val = SPI_getvalue(tuple, tupdesc, pkattnum);
if (val != NULL)
{
appendStringInfo(&buf, " = %s", quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(&buf, " IS NULL");
}
relation_close(rel, AccessShareLock);
return (buf.data);
}
/*
* Return a properly quoted literal value.
* Uses quote_literal in quote.c
*/
static char *
quote_literal_cstr(char *rawstr)
{
text *rawstr_text;
text *result_text;
char *result;
rawstr_text = cstring_to_text(rawstr);
result_text = DatumGetTextP(DirectFunctionCall1(quote_literal,
PointerGetDatum(rawstr_text)));
result = text_to_cstring(result_text);
return result;
}
/*
* Return a properly quoted identifier.
* Uses quote_ident in quote.c
*/
static char *
quote_ident_cstr(char *rawstr)
{
text *rawstr_text;
text *result_text;
char *result;
rawstr_text = cstring_to_text(rawstr);
result_text = DatumGetTextP(DirectFunctionCall1(quote_ident,
PointerGetDatum(rawstr_text)));
result = text_to_cstring(result_text);
return result;
}
static int16
get_attnum_pk_pos(int2vector *pkattnums, int16 pknumatts, int16 key)
{
int i;
/*
* Not likely a long list anyway, so just scan for the value
*/
for (i = 0; i < pknumatts; i++)
if (key == pkattnums->values[i])
return i;
return -1;
}
static HeapTuple
get_tuple_of_interest(Oid relid, int2vector *pkattnums, int16 pknumatts, char **src_pkattvals)
{
Relation rel;
char *relname;
TupleDesc tupdesc;
StringInfoData buf;
int ret;
HeapTuple tuple;
int i;
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(relid);
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
tupdesc = CreateTupleDescCopy(rel->rd_att);
relation_close(rel, AccessShareLock);
/*
* Connect to SPI manager
*/
if ((ret = SPI_connect()) < 0)
/* internal error */
elog(ERROR, "SPI connect failure - returned %d", ret);
/*
* Build sql statement to look up tuple of interest Use src_pkattvals as
* the criteria.
*/
appendStringInfo(&buf, "SELECT * FROM %s WHERE ", relname);
for (i = 0; i < pknumatts; i++)
{
int16 pkattnum = pkattnums->values[i];
if (i > 0)
appendStringInfo(&buf, " AND ");
appendStringInfoString(&buf,
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
if (src_pkattvals[i] != NULL)
appendStringInfo(&buf, " = %s",
quote_literal_cstr(src_pkattvals[i]));
else
appendStringInfo(&buf, " IS NULL");
}
/*
* Retrieve the desired tuple
*/
ret = SPI_exec(buf.data, 0);
pfree(buf.data);
/*
* Only allow one qualifying tuple
*/
if ((ret == SPI_OK_SELECT) && (SPI_processed > 1))
ereport(ERROR,
(errcode(ERRCODE_CARDINALITY_VIOLATION),
errmsg("source criteria matched more than one record")));
else if (ret == SPI_OK_SELECT && SPI_processed == 1)
{
SPITupleTable *tuptable = SPI_tuptable;
tuple = SPI_copytuple(tuptable->vals[0]);
SPI_finish();
return tuple;
}
else
{
/*
* no qualifying tuples
*/
SPI_finish();
return NULL;
}
/*
* never reached, but keep compiler quiet
*/
return NULL;
}
static Oid
get_relid_from_relname(text *relname_text)
{
RangeVar *relvar;
Relation rel;
Oid relid;
relvar = makeRangeVarFromNameList(textToQualifiedNameList(relname_text));
rel = heap_openrv(relvar, AccessShareLock);
relid = RelationGetRelid(rel);
relation_close(rel, AccessShareLock);
return relid;
}
/*
* generate_relation_name - copied from ruleutils.c
* Compute the name to display for a relation specified by OID
*
* The result includes all necessary quoting and schema-prefixing.
*/
static char *
generate_relation_name(Oid relid)
{
HeapTuple tp;
Form_pg_class reltup;
char *nspname;
char *result;
tp = SearchSysCache(RELOID,
ObjectIdGetDatum(relid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for relation %u", relid);
reltup = (Form_pg_class) GETSTRUCT(tp);
/* Qualify the name if not visible in search path */
if (RelationIsVisible(relid))
nspname = NULL;
else
nspname = get_namespace_name(reltup->relnamespace);
result = quote_qualified_identifier(nspname, NameStr(reltup->relname));
ReleaseSysCache(tp);
return result;
}
static remoteConn *
getConnectionByName(const char *name)
{
remoteConnHashEnt *hentry;
char key[NAMEDATALEN];
if (!remoteConnHash)
remoteConnHash = createConnHash();
MemSet(key, 0, NAMEDATALEN);
snprintf(key, NAMEDATALEN - 1, "%s", name);
hentry = (remoteConnHashEnt *) hash_search(remoteConnHash,
key, HASH_FIND, NULL);
if (hentry)
return (hentry->rconn);
return (NULL);
}
static HTAB *
createConnHash(void)
{
HASHCTL ctl;
ctl.keysize = NAMEDATALEN;
ctl.entrysize = sizeof(remoteConnHashEnt);
return hash_create("Remote Con hash", NUMCONN, &ctl, HASH_ELEM);
}
static void
createNewConnection(const char *name, remoteConn * rconn)
{
remoteConnHashEnt *hentry;
bool found;
char key[NAMEDATALEN];
if (!remoteConnHash)
remoteConnHash = createConnHash();
MemSet(key, 0, NAMEDATALEN);
snprintf(key, NAMEDATALEN - 1, "%s", name);
hentry = (remoteConnHashEnt *) hash_search(remoteConnHash, key,
HASH_ENTER, &found);
if (found)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("duplicate connection name")));
hentry->rconn = rconn;
strlcpy(hentry->name, name, sizeof(hentry->name));
}
static void
deleteConnection(const char *name)
{
remoteConnHashEnt *hentry;
bool found;
char key[NAMEDATALEN];
if (!remoteConnHash)
remoteConnHash = createConnHash();
MemSet(key, 0, NAMEDATALEN);
snprintf(key, NAMEDATALEN - 1, "%s", name);
hentry = (remoteConnHashEnt *) hash_search(remoteConnHash,
key, HASH_REMOVE, &found);
if (!hentry)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("undefined connection name")));
}
static void
dblink_security_check(PGconn *conn, remoteConn *rconn)
{
if (!superuser())
{
if (!PQconnectionUsedPassword(conn))
{
PQfinish(conn);
if (rconn)
pfree(rconn);
ereport(ERROR,
(errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("password is required"),
errdetail("Non-superuser cannot connect if the server does not request a password."),
errhint("Target server's authentication method must be changed.")));
}
}
}
/*
* For non-superusers, insist that the connstr specify a password. This
* prevents a password from being picked up from .pgpass, a service file,
* the environment, etc. We don't want the postgres user's passwords
* to be accessible to non-superusers.
*/
static void
dblink_connstr_check(const char *connstr)
{
if (!superuser())
{
PQconninfoOption *options;
PQconninfoOption *option;
bool connstr_gives_password = false;
options = PQconninfoParse(connstr, NULL);
if (options)
{
for (option = options; option->keyword != NULL; option++)
{
if (strcmp(option->keyword, "password") == 0)
{
if (option->val != NULL && option->val[0] != '\0')
{
connstr_gives_password = true;
break;
}
}
}
PQconninfoFree(options);
}
if (!connstr_gives_password)
ereport(ERROR,
(errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("password is required"),
errdetail("Non-superusers must provide a password in the connection string.")));
}
}
static void
dblink_res_error(const char *conname, PGresult *res, const char *dblink_context_msg, bool fail)
{
int level;
char *pg_diag_sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
char *pg_diag_message_primary = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
char *pg_diag_message_detail = PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL);
char *pg_diag_message_hint = PQresultErrorField(res, PG_DIAG_MESSAGE_HINT);
char *pg_diag_context = PQresultErrorField(res, PG_DIAG_CONTEXT);
int sqlstate;
char *message_primary;
char *message_detail;
char *message_hint;
char *message_context;
const char *dblink_context_conname = "unnamed";
if (fail)
level = ERROR;
else
level = NOTICE;
if (pg_diag_sqlstate)
sqlstate = MAKE_SQLSTATE(pg_diag_sqlstate[0],
pg_diag_sqlstate[1],
pg_diag_sqlstate[2],
pg_diag_sqlstate[3],
pg_diag_sqlstate[4]);
else
sqlstate = ERRCODE_CONNECTION_FAILURE;
xpstrdup(message_primary, pg_diag_message_primary);
xpstrdup(message_detail, pg_diag_message_detail);
xpstrdup(message_hint, pg_diag_message_hint);
xpstrdup(message_context, pg_diag_context);
if (res)
PQclear(res);
if (conname)
dblink_context_conname = conname;
ereport(level,
(errcode(sqlstate),
message_primary ? errmsg("%s", message_primary) : errmsg("unknown error"),
message_detail ? errdetail("%s", message_detail) : 0,
message_hint ? errhint("%s", message_hint) : 0,
message_context ? errcontext("%s", message_context) : 0,
errcontext("Error occurred on dblink connection named \"%s\": %s.",
dblink_context_conname, dblink_context_msg)));
}
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