mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-11-27 07:21:09 +08:00
postgres_fdw: Remove duplicate code in DML execution callback functions.
postgresExecForeignInsert(), postgresExecForeignUpdate(), and postgresExecForeignDelete() are coded almost identically, except that postgresExecForeignInsert() does not need CTID. Extract that code into a separate function and use it in all the three function implementations. Author: Ashutosh Bapat Reviewed-By: Michael Paquier Discussion: https://postgr.es/m/CAFjFpRcz8yoY7cBTYofcrCLwjaDeCcGKyTUivUbRiA57y3v-bw%40mail.gmail.com
This commit is contained in:
Etsuro Fujita
parent
d723f56872
commit
6c61d7c593
@ -391,6 +391,11 @@ static PgFdwModifyState *create_foreign_modify(EState *estate,
|
||||
List *target_attrs,
|
||||
bool has_returning,
|
||||
List *retrieved_attrs);
|
||||
static TupleTableSlot *execute_foreign_modify(EState *estate,
|
||||
ResultRelInfo *resultRelInfo,
|
||||
CmdType operation,
|
||||
TupleTableSlot *slot,
|
||||
TupleTableSlot *planSlot);
|
||||
static void prepare_foreign_modify(PgFdwModifyState *fmstate);
|
||||
static const char **convert_prep_stmt_params(PgFdwModifyState *fmstate,
|
||||
ItemPointer tupleid,
|
||||
@ -1776,58 +1781,8 @@ postgresExecForeignInsert(EState *estate,
|
||||
TupleTableSlot *slot,
|
||||
TupleTableSlot *planSlot)
|
||||
{
|
||||
PgFdwModifyState *fmstate = (PgFdwModifyState *) resultRelInfo->ri_FdwState;
|
||||
const char **p_values;
|
||||
PGresult *res;
|
||||
int n_rows;
|
||||
|
||||
/* Set up the prepared statement on the remote server, if we didn't yet */
|
||||
if (!fmstate->p_name)
|
||||
prepare_foreign_modify(fmstate);
|
||||
|
||||
/* Convert parameters needed by prepared statement to text form */
|
||||
p_values = convert_prep_stmt_params(fmstate, NULL, slot);
|
||||
|
||||
/*
|
||||
* Execute the prepared statement.
|
||||
*/
|
||||
if (!PQsendQueryPrepared(fmstate->conn,
|
||||
fmstate->p_name,
|
||||
fmstate->p_nums,
|
||||
p_values,
|
||||
NULL,
|
||||
NULL,
|
||||
0))
|
||||
pgfdw_report_error(ERROR, NULL, fmstate->conn, false, fmstate->query);
|
||||
|
||||
/*
|
||||
* Get the result, and check for success.
|
||||
*
|
||||
* We don't use a PG_TRY block here, so be careful not to throw error
|
||||
* without releasing the PGresult.
|
||||
*/
|
||||
res = pgfdw_get_result(fmstate->conn, fmstate->query);
|
||||
if (PQresultStatus(res) !=
|
||||
(fmstate->has_returning ? PGRES_TUPLES_OK : PGRES_COMMAND_OK))
|
||||
pgfdw_report_error(ERROR, res, fmstate->conn, true, fmstate->query);
|
||||
|
||||
/* Check number of rows affected, and fetch RETURNING tuple if any */
|
||||
if (fmstate->has_returning)
|
||||
{
|
||||
n_rows = PQntuples(res);
|
||||
if (n_rows > 0)
|
||||
store_returning_result(fmstate, slot, res);
|
||||
}
|
||||
else
|
||||
n_rows = atoi(PQcmdTuples(res));
|
||||
|
||||
/* And clean up */
|
||||
PQclear(res);
|
||||
|
||||
MemoryContextReset(fmstate->temp_cxt);
|
||||
|
||||
/* Return NULL if nothing was inserted on the remote end */
|
||||
return (n_rows > 0) ? slot : NULL;
|
||||
return execute_foreign_modify(estate, resultRelInfo, CMD_INSERT,
|
||||
slot, planSlot);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1840,70 +1795,8 @@ postgresExecForeignUpdate(EState *estate,
|
||||
TupleTableSlot *slot,
|
||||
TupleTableSlot *planSlot)
|
||||
{
|
||||
PgFdwModifyState *fmstate = (PgFdwModifyState *) resultRelInfo->ri_FdwState;
|
||||
Datum datum;
|
||||
bool isNull;
|
||||
const char **p_values;
|
||||
PGresult *res;
|
||||
int n_rows;
|
||||
|
||||
/* Set up the prepared statement on the remote server, if we didn't yet */
|
||||
if (!fmstate->p_name)
|
||||
prepare_foreign_modify(fmstate);
|
||||
|
||||
/* Get the ctid that was passed up as a resjunk column */
|
||||
datum = ExecGetJunkAttribute(planSlot,
|
||||
fmstate->ctidAttno,
|
||||
&isNull);
|
||||
/* shouldn't ever get a null result... */
|
||||
if (isNull)
|
||||
elog(ERROR, "ctid is NULL");
|
||||
|
||||
/* Convert parameters needed by prepared statement to text form */
|
||||
p_values = convert_prep_stmt_params(fmstate,
|
||||
(ItemPointer) DatumGetPointer(datum),
|
||||
slot);
|
||||
|
||||
/*
|
||||
* Execute the prepared statement.
|
||||
*/
|
||||
if (!PQsendQueryPrepared(fmstate->conn,
|
||||
fmstate->p_name,
|
||||
fmstate->p_nums,
|
||||
p_values,
|
||||
NULL,
|
||||
NULL,
|
||||
0))
|
||||
pgfdw_report_error(ERROR, NULL, fmstate->conn, false, fmstate->query);
|
||||
|
||||
/*
|
||||
* Get the result, and check for success.
|
||||
*
|
||||
* We don't use a PG_TRY block here, so be careful not to throw error
|
||||
* without releasing the PGresult.
|
||||
*/
|
||||
res = pgfdw_get_result(fmstate->conn, fmstate->query);
|
||||
if (PQresultStatus(res) !=
|
||||
(fmstate->has_returning ? PGRES_TUPLES_OK : PGRES_COMMAND_OK))
|
||||
pgfdw_report_error(ERROR, res, fmstate->conn, true, fmstate->query);
|
||||
|
||||
/* Check number of rows affected, and fetch RETURNING tuple if any */
|
||||
if (fmstate->has_returning)
|
||||
{
|
||||
n_rows = PQntuples(res);
|
||||
if (n_rows > 0)
|
||||
store_returning_result(fmstate, slot, res);
|
||||
}
|
||||
else
|
||||
n_rows = atoi(PQcmdTuples(res));
|
||||
|
||||
/* And clean up */
|
||||
PQclear(res);
|
||||
|
||||
MemoryContextReset(fmstate->temp_cxt);
|
||||
|
||||
/* Return NULL if nothing was updated on the remote end */
|
||||
return (n_rows > 0) ? slot : NULL;
|
||||
return execute_foreign_modify(estate, resultRelInfo, CMD_UPDATE,
|
||||
slot, planSlot);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1916,70 +1809,8 @@ postgresExecForeignDelete(EState *estate,
|
||||
TupleTableSlot *slot,
|
||||
TupleTableSlot *planSlot)
|
||||
{
|
||||
PgFdwModifyState *fmstate = (PgFdwModifyState *) resultRelInfo->ri_FdwState;
|
||||
Datum datum;
|
||||
bool isNull;
|
||||
const char **p_values;
|
||||
PGresult *res;
|
||||
int n_rows;
|
||||
|
||||
/* Set up the prepared statement on the remote server, if we didn't yet */
|
||||
if (!fmstate->p_name)
|
||||
prepare_foreign_modify(fmstate);
|
||||
|
||||
/* Get the ctid that was passed up as a resjunk column */
|
||||
datum = ExecGetJunkAttribute(planSlot,
|
||||
fmstate->ctidAttno,
|
||||
&isNull);
|
||||
/* shouldn't ever get a null result... */
|
||||
if (isNull)
|
||||
elog(ERROR, "ctid is NULL");
|
||||
|
||||
/* Convert parameters needed by prepared statement to text form */
|
||||
p_values = convert_prep_stmt_params(fmstate,
|
||||
(ItemPointer) DatumGetPointer(datum),
|
||||
NULL);
|
||||
|
||||
/*
|
||||
* Execute the prepared statement.
|
||||
*/
|
||||
if (!PQsendQueryPrepared(fmstate->conn,
|
||||
fmstate->p_name,
|
||||
fmstate->p_nums,
|
||||
p_values,
|
||||
NULL,
|
||||
NULL,
|
||||
0))
|
||||
pgfdw_report_error(ERROR, NULL, fmstate->conn, false, fmstate->query);
|
||||
|
||||
/*
|
||||
* Get the result, and check for success.
|
||||
*
|
||||
* We don't use a PG_TRY block here, so be careful not to throw error
|
||||
* without releasing the PGresult.
|
||||
*/
|
||||
res = pgfdw_get_result(fmstate->conn, fmstate->query);
|
||||
if (PQresultStatus(res) !=
|
||||
(fmstate->has_returning ? PGRES_TUPLES_OK : PGRES_COMMAND_OK))
|
||||
pgfdw_report_error(ERROR, res, fmstate->conn, true, fmstate->query);
|
||||
|
||||
/* Check number of rows affected, and fetch RETURNING tuple if any */
|
||||
if (fmstate->has_returning)
|
||||
{
|
||||
n_rows = PQntuples(res);
|
||||
if (n_rows > 0)
|
||||
store_returning_result(fmstate, slot, res);
|
||||
}
|
||||
else
|
||||
n_rows = atoi(PQcmdTuples(res));
|
||||
|
||||
/* And clean up */
|
||||
PQclear(res);
|
||||
|
||||
MemoryContextReset(fmstate->temp_cxt);
|
||||
|
||||
/* Return NULL if nothing was deleted on the remote end */
|
||||
return (n_rows > 0) ? slot : NULL;
|
||||
return execute_foreign_modify(estate, resultRelInfo, CMD_DELETE,
|
||||
slot, planSlot);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -3425,6 +3256,98 @@ create_foreign_modify(EState *estate,
|
||||
return fmstate;
|
||||
}
|
||||
|
||||
/*
|
||||
* execute_foreign_modify
|
||||
* Perform foreign-table modification as required, and fetch RETURNING
|
||||
* result if any. (This is the shared guts of postgresExecForeignInsert,
|
||||
* postgresExecForeignUpdate, and postgresExecForeignDelete.)
|
||||
*/
|
||||
static TupleTableSlot *
|
||||
execute_foreign_modify(EState *estate,
|
||||
ResultRelInfo *resultRelInfo,
|
||||
CmdType operation,
|
||||
TupleTableSlot *slot,
|
||||
TupleTableSlot *planSlot)
|
||||
{
|
||||
PgFdwModifyState *fmstate = (PgFdwModifyState *) resultRelInfo->ri_FdwState;
|
||||
ItemPointer ctid = NULL;
|
||||
const char **p_values;
|
||||
PGresult *res;
|
||||
int n_rows;
|
||||
|
||||
/* The operation should be INSERT, UPDATE, or DELETE */
|
||||
Assert(operation == CMD_INSERT ||
|
||||
operation == CMD_UPDATE ||
|
||||
operation == CMD_DELETE);
|
||||
|
||||
/* Set up the prepared statement on the remote server, if we didn't yet */
|
||||
if (!fmstate->p_name)
|
||||
prepare_foreign_modify(fmstate);
|
||||
|
||||
/*
|
||||
* For UPDATE/DELETE, get the ctid that was passed up as a resjunk column
|
||||
*/
|
||||
if (operation == CMD_UPDATE || operation == CMD_DELETE)
|
||||
{
|
||||
Datum datum;
|
||||
bool isNull;
|
||||
|
||||
datum = ExecGetJunkAttribute(planSlot,
|
||||
fmstate->ctidAttno,
|
||||
&isNull);
|
||||
/* shouldn't ever get a null result... */
|
||||
if (isNull)
|
||||
elog(ERROR, "ctid is NULL");
|
||||
ctid = (ItemPointer) DatumGetPointer(datum);
|
||||
}
|
||||
|
||||
/* Convert parameters needed by prepared statement to text form */
|
||||
p_values = convert_prep_stmt_params(fmstate, ctid, slot);
|
||||
|
||||
/*
|
||||
* Execute the prepared statement.
|
||||
*/
|
||||
if (!PQsendQueryPrepared(fmstate->conn,
|
||||
fmstate->p_name,
|
||||
fmstate->p_nums,
|
||||
p_values,
|
||||
NULL,
|
||||
NULL,
|
||||
0))
|
||||
pgfdw_report_error(ERROR, NULL, fmstate->conn, false, fmstate->query);
|
||||
|
||||
/*
|
||||
* Get the result, and check for success.
|
||||
*
|
||||
* We don't use a PG_TRY block here, so be careful not to throw error
|
||||
* without releasing the PGresult.
|
||||
*/
|
||||
res = pgfdw_get_result(fmstate->conn, fmstate->query);
|
||||
if (PQresultStatus(res) !=
|
||||
(fmstate->has_returning ? PGRES_TUPLES_OK : PGRES_COMMAND_OK))
|
||||
pgfdw_report_error(ERROR, res, fmstate->conn, true, fmstate->query);
|
||||
|
||||
/* Check number of rows affected, and fetch RETURNING tuple if any */
|
||||
if (fmstate->has_returning)
|
||||
{
|
||||
n_rows = PQntuples(res);
|
||||
if (n_rows > 0)
|
||||
store_returning_result(fmstate, slot, res);
|
||||
}
|
||||
else
|
||||
n_rows = atoi(PQcmdTuples(res));
|
||||
|
||||
/* And clean up */
|
||||
PQclear(res);
|
||||
|
||||
MemoryContextReset(fmstate->temp_cxt);
|
||||
|
||||
/*
|
||||
* Return NULL if nothing was inserted/updated/deleted on the remote end
|
||||
*/
|
||||
return (n_rows > 0) ? slot : NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* prepare_foreign_modify
|
||||
* Establish a prepared statement for execution of INSERT/UPDATE/DELETE
|
||||
|
||||
Loading…
Reference in New Issue
Block a user