/*
* psql - the PostgreSQL interactive terminal
*
- * Copyright (c) 2000-2003, PostgreSQL Global Development Group
+ * Copyright (c) 2000-2010, PostgreSQL Global Development Group
*
- * $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.79 2004/01/09 21:12:20 momjian Exp $
+ * $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.147 2010/07/28 04:39:14 petere Exp $
*/
#include "postgres_fe.h"
#include "common.h"
#include <ctype.h>
-#ifndef HAVE_STRDUP
-#include <strdup.h>
-#endif
#include <signal.h>
#ifndef WIN32
-#include <sys/time.h>
#include <unistd.h> /* for write() */
-#include <setjmp.h>
#else
#include <io.h> /* for _write() */
#include <win32.h>
-#include <sys/timeb.h> /* for _ftime() */
#endif
-#include "libpq-fe.h"
+#include "portability/instr_time.h"
+
#include "pqsignal.h"
#include "settings.h"
-#include "variables.h"
#include "command.h"
#include "copy.h"
-#include "prompt.h"
-#include "print.h"
-#include "mainloop.h"
-#include "mb/pg_wchar.h"
-
-
-/* Workarounds for Windows */
-/* Probably to be moved up the source tree in the future, perhaps to be replaced by
- * more specific checks like configure-style HAVE_GETTIMEOFDAY macros.
- */
-#ifndef WIN32
-
-typedef struct timeval TimevalStruct;
+#include "mbprint.h"
-#define GETTIMEOFDAY(T) gettimeofday(T, NULL)
-#define DIFF_MSEC(T, U) \
- ((((int) ((T)->tv_sec - (U)->tv_sec)) * 1000000.0 + \
- ((int) ((T)->tv_usec - (U)->tv_usec))) / 1000.0)
-
-#else
-
-typedef struct _timeb TimevalStruct;
-
-#define GETTIMEOFDAY(T) _ftime(T)
-#define DIFF_MSEC(T, U) \
- (((T)->time - (U)->time) * 1000.0 + \
- ((T)->millitm - (U)->millitm))
-
-#endif
-extern bool prompt_state;
-
-
-static bool is_transact_command(const char *query);
+static bool ExecQueryUsingCursor(const char *query, double *elapsed_msec);
+static bool command_no_begin(const char *query);
+static bool is_select_command(const char *query);
/*
* "Safe" wrapper around strdup()
*/
char *
-xstrdup(const char *string)
+pg_strdup(const char *string)
{
char *tmp;
if (!string)
{
- fprintf(stderr, gettext("%s: xstrdup: cannot duplicate null pointer (internal error)\n"),
+ fprintf(stderr, _("%s: pg_strdup: cannot duplicate null pointer (internal error)\n"),
pset.progname);
exit(EXIT_FAILURE);
}
return tmp;
}
+void *
+pg_malloc(size_t size)
+{
+ void *tmp;
+
+ tmp = malloc(size);
+ if (!tmp)
+ {
+ psql_error("out of memory\n");
+ exit(EXIT_FAILURE);
+ }
+ return tmp;
+}
+
+void *
+pg_malloc_zero(size_t size)
+{
+ void *tmp;
+ tmp = pg_malloc(size);
+ memset(tmp, 0, size);
+ return tmp;
+}
+
+void *
+pg_calloc(size_t nmemb, size_t size)
+{
+ void *tmp;
+
+ tmp = calloc(nmemb, size);
+ if (!tmp)
+ {
+ psql_error("out of memory");
+ exit(EXIT_FAILURE);
+ }
+ return tmp;
+}
/*
* setQFout
fflush(pset.queryFout);
if (pset.inputfile)
- fprintf(stderr, "%s:%s:%u: ", pset.progname, pset.inputfile, pset.lineno);
+ fprintf(stderr, "%s:%s:" UINT64_FORMAT ": ", pset.progname, pset.inputfile, pset.lineno);
va_start(ap, fmt);
- vfprintf(stderr, gettext(fmt), ap);
+ vfprintf(stderr, _(fmt), ap);
va_end(ap);
}
/*
* Code to support query cancellation
*
- * Before we start a query, we enable a SIGINT signal catcher that sends a
+ * Before we start a query, we enable the SIGINT signal catcher to send a
* cancel request to the backend. Note that sending the cancel directly from
- * the signal handler is safe because PQrequestCancel() is written to make it
- * so. We use write() to print to stdout because it's better to use simple
+ * the signal handler is safe because PQcancel() is written to make it
+ * so. We use write() to report to stderr because it's better to use simple
* facilities in a signal handler.
+ *
+ * On win32, the signal cancelling happens on a separate thread, because
+ * that's how SetConsoleCtrlHandler works. The PQcancel function is safe
+ * for this (unlike PQrequestCancel). However, a CRITICAL_SECTION is required
+ * to protect the PGcancel structure against being changed while the signal
+ * thread is using it.
+ *
+ * SIGINT is supposed to abort all long-running psql operations, not only
+ * database queries. In most places, this is accomplished by checking
+ * cancel_pressed during long-running loops. However, that won't work when
+ * blocked on user input (in readline() or fgets()). In those places, we
+ * set sigint_interrupt_enabled TRUE while blocked, instructing the signal
+ * catcher to longjmp through sigint_interrupt_jmp. We assume readline and
+ * fgets are coded to handle possible interruption. (XXX currently this does
+ * not work on win32, so control-C is less useful there)
*/
-static PGconn *volatile cancelConn = NULL;
+volatile bool sigint_interrupt_enabled = false;
-volatile bool cancel_pressed = false;
+sigjmp_buf sigint_interrupt_jmp;
+static PGcancel *volatile cancelConn = NULL;
-#ifndef WIN32
+#ifdef WIN32
+static CRITICAL_SECTION cancelConnLock;
+#endif
-#define write_stderr(String) write(fileno(stderr), String, strlen(String))
+#define write_stderr(str) write(fileno(stderr), str, strlen(str))
-void
+
+#ifndef WIN32
+
+static void
handle_sigint(SIGNAL_ARGS)
{
int save_errno = errno;
+ char errbuf[256];
- /* Don't muck around if prompting for a password. */
- if (prompt_state)
- return;
-
- if (cancelConn == NULL)
- siglongjmp(main_loop_jmp, 1);
+ /* if we are waiting for input, longjmp out of it */
+ if (sigint_interrupt_enabled)
+ {
+ sigint_interrupt_enabled = false;
+ siglongjmp(sigint_interrupt_jmp, 1);
+ }
+ /* else, set cancel flag to stop any long-running loops */
cancel_pressed = true;
- if (PQrequestCancel(cancelConn))
- write_stderr("Cancel request sent\n");
- else
+ /* and send QueryCancel if we are processing a database query */
+ if (cancelConn != NULL)
{
- write_stderr("Could not send cancel request: ");
- write_stderr(PQerrorMessage(cancelConn));
+ if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
+ write_stderr("Cancel request sent\n");
+ else
+ {
+ write_stderr("Could not send cancel request: ");
+ write_stderr(errbuf);
+ }
}
+
errno = save_errno; /* just in case the write changed it */
}
-#endif /* not WIN32 */
+void
+setup_cancel_handler(void)
+{
+ pqsignal(SIGINT, handle_sigint);
+}
+#else /* WIN32 */
+
+static BOOL WINAPI
+consoleHandler(DWORD dwCtrlType)
+{
+ char errbuf[256];
+
+ if (dwCtrlType == CTRL_C_EVENT ||
+ dwCtrlType == CTRL_BREAK_EVENT)
+ {
+ /*
+ * Can't longjmp here, because we are in wrong thread :-(
+ */
+
+ /* set cancel flag to stop any long-running loops */
+ cancel_pressed = true;
+
+ /* and send QueryCancel if we are processing a database query */
+ EnterCriticalSection(&cancelConnLock);
+ if (cancelConn != NULL)
+ {
+ if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
+ write_stderr("Cancel request sent\n");
+ else
+ {
+ write_stderr("Could not send cancel request: ");
+ write_stderr(errbuf);
+ }
+ }
+ LeaveCriticalSection(&cancelConnLock);
+
+ return TRUE;
+ }
+ else
+ /* Return FALSE for any signals not being handled */
+ return FALSE;
+}
+
+void
+setup_cancel_handler(void)
+{
+ InitializeCriticalSection(&cancelConnLock);
+
+ SetConsoleCtrlHandler(consoleHandler, TRUE);
+}
+#endif /* WIN32 */
/* ConnectionUp
* Returns whether our backend connection is still there.
*/
static bool
-ConnectionUp()
+ConnectionUp(void)
{
return PQstatus(pset.db) != CONNECTION_BAD;
}
exit(EXIT_BADCONN);
}
- fputs(gettext("The connection to the server was lost. Attempting reset: "), stderr);
+ fputs(_("The connection to the server was lost. Attempting reset: "), stderr);
PQreset(pset.db);
OK = ConnectionUp();
if (!OK)
{
- fputs(gettext("Failed.\n"), stderr);
+ fputs(_("Failed.\n"), stderr);
PQfinish(pset.db);
pset.db = NULL;
ResetCancelConn();
UnsyncVariables();
}
else
- fputs(gettext("Succeeded.\n"), stderr);
+ fputs(_("Succeeded.\n"), stderr);
}
return OK;
*
* Set cancelConn to point to the current database connection.
*/
-static void
+void
SetCancelConn(void)
{
- cancelConn = pset.db;
+ PGcancel *oldCancelConn;
+
+#ifdef WIN32
+ EnterCriticalSection(&cancelConnLock);
+#endif
+
+ /* Free the old one if we have one */
+ oldCancelConn = cancelConn;
+ /* be sure handle_sigint doesn't use pointer while freeing */
+ cancelConn = NULL;
+
+ if (oldCancelConn != NULL)
+ PQfreeCancel(oldCancelConn);
+
+ cancelConn = PQgetCancel(pset.db);
+
+#ifdef WIN32
+ LeaveCriticalSection(&cancelConnLock);
+#endif
}
/*
* ResetCancelConn
*
- * Set cancelConn to NULL. I don't know what this means exactly, but it saves
- * having to export the variable.
+ * Free the current cancel connection, if any, and set to NULL.
*/
void
ResetCancelConn(void)
{
+ PGcancel *oldCancelConn;
+
+#ifdef WIN32
+ EnterCriticalSection(&cancelConnLock);
+#endif
+
+ oldCancelConn = cancelConn;
+ /* be sure handle_sigint doesn't use pointer while freeing */
cancelConn = NULL;
+
+ if (oldCancelConn != NULL)
+ PQfreeCancel(oldCancelConn);
+
+#ifdef WIN32
+ LeaveCriticalSection(&cancelConnLock);
+#endif
}
* AcceptResult
*
* Checks whether a result is valid, giving an error message if necessary;
- * resets cancelConn as needed, and ensures that the connection to the backend
- * is still up.
+ * and ensures that the connection to the backend is still up.
*
* Returns true for valid result, false for error state.
*/
{
bool OK = true;
- ResetCancelConn();
-
if (!result)
OK = false;
else
case PGRES_TUPLES_OK:
case PGRES_EMPTY_QUERY:
case PGRES_COPY_IN:
- /* Fine, do nothing */
- break;
-
case PGRES_COPY_OUT:
- /* keep cancel connection for copy out state */
- SetCancelConn();
+ /* Fine, do nothing */
break;
default:
if (!OK)
{
- psql_error("%s", PQerrorMessage(pset.db));
+ const char *error = PQerrorMessage(pset.db);
+
+ if (strlen(error))
+ psql_error("%s", error);
+
CheckConnection();
}
* is true; nothing special is done when start_xact is false. Typically,
* start_xact = false is used for SELECTs and explicit BEGIN/COMMIT commands.
*
+ * Caller is responsible for handling the ensuing processing if a COPY
+ * command is sent.
+ *
* Note: we don't bother to check PQclientEncoding; it is assumed that no
* caller uses this path to issue "SET CLIENT_ENCODING".
*/
PSQLexec(const char *query, bool start_xact)
{
PGresult *res;
- int echo_hidden;
if (!pset.db)
{
return NULL;
}
- echo_hidden = SwitchVariable(pset.vars, "ECHO_HIDDEN", "noexec", NULL);
- if (echo_hidden != VAR_NOTSET)
+ if (pset.echo_hidden != PSQL_ECHO_HIDDEN_OFF)
{
- printf("********* QUERY **********\n"
- "%s\n"
- "**************************\n\n", query);
+ printf(_("********* QUERY **********\n"
+ "%s\n"
+ "**************************\n\n"), query);
fflush(stdout);
+ if (pset.logfile)
+ {
+ fprintf(pset.logfile,
+ _("********* QUERY **********\n"
+ "%s\n"
+ "**************************\n\n"), query);
+ fflush(pset.logfile);
+ }
- if (echo_hidden == 1) /* noexec? */
+ if (pset.echo_hidden == PSQL_ECHO_HIDDEN_NOEXEC)
return NULL;
}
SetCancelConn();
- if (start_xact && PQtransactionStatus(pset.db) == PQTRANS_IDLE &&
- !GetVariableBool(pset.vars, "AUTOCOMMIT"))
+ if (start_xact &&
+ !pset.autocommit &&
+ PQtransactionStatus(pset.db) == PQTRANS_IDLE)
{
res = PQexec(pset.db, "BEGIN");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
res = PQexec(pset.db, query);
- if (!AcceptResult(res) && res)
+ ResetCancelConn();
+
+ if (!AcceptResult(res))
{
PQclear(res);
res = NULL;
while ((notify = PQnotifies(pset.db)))
{
- fprintf(pset.queryFout, gettext("Asynchronous notification \"%s\" received from server process with PID %d.\n"),
- notify->relname, notify->be_pid);
+ /* for backward compatibility, only show payload if nonempty */
+ if (notify->extra[0])
+ fprintf(pset.queryFout, _("Asynchronous notification \"%s\" with payload \"%s\" received from server process with PID %d.\n"),
+ notify->relname, notify->extra, notify->be_pid);
+ else
+ fprintf(pset.queryFout, _("Asynchronous notification \"%s\" received from server process with PID %d.\n"),
+ notify->relname, notify->be_pid);
fflush(pset.queryFout);
PQfreemem(notify);
}
static bool
PrintQueryTuples(const PGresult *results)
{
+ printQueryOpt my_popt = pset.popt;
+
/* write output to \g argument, if any */
if (pset.gfname)
{
+ /* keep this code in sync with ExecQueryUsingCursor */
FILE *queryFout_copy = pset.queryFout;
bool queryFoutPipe_copy = pset.queryFoutPipe;
return false;
}
- printQuery(results, &pset.popt, pset.queryFout);
+ printQuery(results, &my_popt, pset.queryFout, pset.logfile);
/* close file/pipe, restore old setting */
setQFout(NULL);
pset.gfname = NULL;
}
else
- printQuery(results, &pset.popt, pset.queryFout);
+ printQuery(results, &my_popt, pset.queryFout, pset.logfile);
return true;
}
break;
case PGRES_COPY_OUT:
+ SetCancelConn();
success = handleCopyOut(pset.db, pset.queryFout);
+ ResetCancelConn();
break;
case PGRES_COPY_IN:
- if (pset.cur_cmd_interactive && !QUIET())
- puts(gettext("Enter data to be copied followed by a newline.\n"
- "End with a backslash and a period on a line by itself."));
-
+ SetCancelConn();
success = handleCopyIn(pset.db, pset.cur_cmd_source,
- pset.cur_cmd_interactive ? get_prompt(PROMPT_COPY) : NULL);
+ PQbinaryTuples(results));
+ ResetCancelConn();
break;
default:
}
+/*
+ * PrintQueryStatus: report command status as required
+ *
+ * Note: Utility function for use by PrintQueryResults() only.
+ */
+static void
+PrintQueryStatus(PGresult *results)
+{
+ char buf[16];
+
+ if (!pset.quiet)
+ {
+ if (pset.popt.topt.format == PRINT_HTML)
+ {
+ fputs("<p>", pset.queryFout);
+ html_escaped_print(PQcmdStatus(results), pset.queryFout);
+ fputs("</p>\n", pset.queryFout);
+ }
+ else
+ fprintf(pset.queryFout, "%s\n", PQcmdStatus(results));
+ }
+
+ if (pset.logfile)
+ fprintf(pset.logfile, "%s\n", PQcmdStatus(results));
+
+ snprintf(buf, sizeof(buf), "%u", (unsigned int) PQoidValue(results));
+ SetVariable(pset.vars, "LASTOID", buf);
+}
+
+
/*
* PrintQueryResults: print out query results as required
*
PrintQueryResults(PGresult *results)
{
bool success = false;
+ const char *cmdstatus;
if (!results)
return false;
switch (PQresultStatus(results))
{
case PGRES_TUPLES_OK:
+ /* print the data ... */
success = PrintQueryTuples(results);
+ /* if it's INSERT/UPDATE/DELETE RETURNING, also print status */
+ cmdstatus = PQcmdStatus(results);
+ if (strncmp(cmdstatus, "INSERT", 6) == 0 ||
+ strncmp(cmdstatus, "UPDATE", 6) == 0 ||
+ strncmp(cmdstatus, "DELETE", 6) == 0)
+ PrintQueryStatus(results);
break;
case PGRES_COMMAND_OK:
- {
- char buf[10];
-
- success = true;
- sprintf(buf, "%u", (unsigned int) PQoidValue(results));
- if (!QUIET())
- {
- if (pset.popt.topt.format == PRINT_HTML)
- {
- fputs("<p>", pset.queryFout);
- html_escaped_print(PQcmdStatus(results),
- pset.queryFout);
- fputs("</p>\n", pset.queryFout);
- }
- else
- fprintf(pset.queryFout, "%s\n", PQcmdStatus(results));
- }
- SetVariable(pset.vars, "LASTOID", buf);
- break;
- }
+ PrintQueryStatus(results);
+ success = true;
+ break;
case PGRES_EMPTY_QUERY:
success = true;
SendQuery(const char *query)
{
PGresult *results;
- TimevalStruct before,
- after;
- bool OK;
+ PGTransactionStatusType transaction_status;
+ double elapsed_msec = 0;
+ bool OK,
+ on_error_rollback_savepoint = false;
+ static bool on_error_rollback_warning = false;
if (!pset.db)
{
return false;
}
- if (GetVariableBool(pset.vars, "SINGLESTEP"))
+ if (pset.singlestep)
{
char buf[3];
- printf(gettext("***(Single step mode: verify command)*******************************************\n"
- "%s\n"
- "***(press return to proceed or enter x and return to cancel)********************\n"),
+ printf(_("***(Single step mode: verify command)*******************************************\n"
+ "%s\n"
+ "***(press return to proceed or enter x and return to cancel)********************\n"),
query);
fflush(stdout);
if (fgets(buf, sizeof(buf), stdin) != NULL)
if (buf[0] == 'x')
return false;
}
- else if (VariableEquals(pset.vars, "ECHO", "queries"))
+ else if (pset.echo == PSQL_ECHO_QUERIES)
{
puts(query);
fflush(stdout);
}
+ if (pset.logfile)
+ {
+ fprintf(pset.logfile,
+ _("********* QUERY **********\n"
+ "%s\n"
+ "**************************\n\n"), query);
+ fflush(pset.logfile);
+ }
+
SetCancelConn();
- if (PQtransactionStatus(pset.db) == PQTRANS_IDLE &&
- !GetVariableBool(pset.vars, "AUTOCOMMIT") &&
- !is_transact_command(query))
+ transaction_status = PQtransactionStatus(pset.db);
+
+ if (transaction_status == PQTRANS_IDLE &&
+ !pset.autocommit &&
+ !command_no_begin(query))
{
results = PQexec(pset.db, "BEGIN");
if (PQresultStatus(results) != PGRES_COMMAND_OK)
return false;
}
PQclear(results);
+ transaction_status = PQtransactionStatus(pset.db);
}
- if (pset.timing)
- GETTIMEOFDAY(&before);
+ if (transaction_status == PQTRANS_INTRANS &&
+ pset.on_error_rollback != PSQL_ERROR_ROLLBACK_OFF &&
+ (pset.cur_cmd_interactive ||
+ pset.on_error_rollback == PSQL_ERROR_ROLLBACK_ON))
+ {
+ if (on_error_rollback_warning == false && pset.sversion < 80000)
+ {
+ fprintf(stderr, _("The server (version %d.%d) does not support savepoints for ON_ERROR_ROLLBACK.\n"),
+ pset.sversion / 10000, (pset.sversion / 100) % 100);
+ on_error_rollback_warning = true;
+ }
+ else
+ {
+ results = PQexec(pset.db, "SAVEPOINT pg_psql_temporary_savepoint");
+ if (PQresultStatus(results) != PGRES_COMMAND_OK)
+ {
+ psql_error("%s", PQerrorMessage(pset.db));
+ PQclear(results);
+ ResetCancelConn();
+ return false;
+ }
+ PQclear(results);
+ on_error_rollback_savepoint = true;
+ }
+ }
- results = PQexec(pset.db, query);
+ if (pset.fetch_count <= 0 || !is_select_command(query))
+ {
+ /* Default fetch-it-all-and-print mode */
+ instr_time before,
+ after;
- /* these operations are included in the timing result: */
- OK = (AcceptResult(results) && ProcessCopyResult(results));
+ if (pset.timing)
+ INSTR_TIME_SET_CURRENT(before);
- if (pset.timing)
- GETTIMEOFDAY(&after);
+ results = PQexec(pset.db, query);
- /* but printing results isn't: */
- if (OK)
- OK = PrintQueryResults(results);
+ /* these operations are included in the timing result: */
+ ResetCancelConn();
+ OK = (AcceptResult(results) && ProcessCopyResult(results));
+
+ if (pset.timing)
+ {
+ INSTR_TIME_SET_CURRENT(after);
+ INSTR_TIME_SUBTRACT(after, before);
+ elapsed_msec = INSTR_TIME_GET_MILLISEC(after);
+ }
+
+ /* but printing results isn't: */
+ if (OK)
+ OK = PrintQueryResults(results);
+ }
+ else
+ {
+ /* Fetch-in-segments mode */
+ OK = ExecQueryUsingCursor(query, &elapsed_msec);
+ ResetCancelConn();
+ results = NULL; /* PQclear(NULL) does nothing */
+ }
+
+ /* If we made a temporary savepoint, possibly release/rollback */
+ if (on_error_rollback_savepoint)
+ {
+ const char *svptcmd;
+
+ transaction_status = PQtransactionStatus(pset.db);
+
+ if (transaction_status == PQTRANS_INERROR)
+ {
+ /* We always rollback on an error */
+ svptcmd = "ROLLBACK TO pg_psql_temporary_savepoint";
+ }
+ else if (transaction_status != PQTRANS_INTRANS)
+ {
+ /* If they are no longer in a transaction, then do nothing */
+ svptcmd = NULL;
+ }
+ else
+ {
+ /*
+ * Do nothing if they are messing with savepoints themselves: If
+ * the user did RELEASE or ROLLBACK, our savepoint is gone. If
+ * they issued a SAVEPOINT, releasing ours would remove theirs.
+ */
+ if (results &&
+ (strcmp(PQcmdStatus(results), "SAVEPOINT") == 0 ||
+ strcmp(PQcmdStatus(results), "RELEASE") == 0 ||
+ strcmp(PQcmdStatus(results), "ROLLBACK") == 0))
+ svptcmd = NULL;
+ else
+ svptcmd = "RELEASE pg_psql_temporary_savepoint";
+ }
+
+ if (svptcmd)
+ {
+ PGresult *svptres;
+
+ svptres = PQexec(pset.db, svptcmd);
+ if (PQresultStatus(svptres) != PGRES_COMMAND_OK)
+ {
+ psql_error("%s", PQerrorMessage(pset.db));
+ PQclear(svptres);
+
+ PQclear(results);
+ ResetCancelConn();
+ return false;
+ }
+ PQclear(svptres);
+ }
+ }
PQclear(results);
/* Possible microtiming output */
if (OK && pset.timing)
- printf(gettext("Time: %.3f ms\n"), DIFF_MSEC(&after, &before));
+ printf(_("Time: %.3f ms\n"), elapsed_msec);
/* check for events that may occur during query execution */
return OK;
}
+
/*
- * check whether a query string begins with BEGIN/COMMIT/ROLLBACK/START XACT
+ * ExecQueryUsingCursor: run a SELECT-like query using a cursor
+ *
+ * This feature allows result sets larger than RAM to be dealt with.
+ *
+ * Returns true if the query executed successfully, false otherwise.
+ *
+ * If pset.timing is on, total query time (exclusive of result-printing) is
+ * stored into *elapsed_msec.
*/
static bool
-is_transact_command(const char *query)
+ExecQueryUsingCursor(const char *query, double *elapsed_msec)
{
- int wordlen;
+ bool OK = true;
+ PGresult *results;
+ PQExpBufferData buf;
+ printQueryOpt my_popt = pset.popt;
+ FILE *queryFout_copy = pset.queryFout;
+ bool queryFoutPipe_copy = pset.queryFoutPipe;
+ bool started_txn = false;
+ bool did_pager = false;
+ int ntuples;
+ char fetch_cmd[64];
+ instr_time before,
+ after;
+ int flush_error;
+
+ *elapsed_msec = 0;
+
+ /* initialize print options for partial table output */
+ my_popt.topt.start_table = true;
+ my_popt.topt.stop_table = false;
+ my_popt.topt.prior_records = 0;
+
+ if (pset.timing)
+ INSTR_TIME_SET_CURRENT(before);
+
+ /* if we're not in a transaction, start one */
+ if (PQtransactionStatus(pset.db) == PQTRANS_IDLE)
+ {
+ results = PQexec(pset.db, "BEGIN");
+ OK = AcceptResult(results) &&
+ (PQresultStatus(results) == PGRES_COMMAND_OK);
+ PQclear(results);
+ if (!OK)
+ return false;
+ started_txn = true;
+ }
+
+ /* Send DECLARE CURSOR */
+ initPQExpBuffer(&buf);
+ appendPQExpBuffer(&buf, "DECLARE _psql_cursor NO SCROLL CURSOR FOR\n%s",
+ query);
+
+ results = PQexec(pset.db, buf.data);
+ OK = AcceptResult(results) &&
+ (PQresultStatus(results) == PGRES_COMMAND_OK);
+ PQclear(results);
+ termPQExpBuffer(&buf);
+ if (!OK)
+ goto cleanup;
+
+ if (pset.timing)
+ {
+ INSTR_TIME_SET_CURRENT(after);
+ INSTR_TIME_SUBTRACT(after, before);
+ *elapsed_msec += INSTR_TIME_GET_MILLISEC(after);
+ }
+
+ snprintf(fetch_cmd, sizeof(fetch_cmd),
+ "FETCH FORWARD %d FROM _psql_cursor",
+ pset.fetch_count);
+
+ /* prepare to write output to \g argument, if any */
+ if (pset.gfname)
+ {
+ /* keep this code in sync with PrintQueryTuples */
+ pset.queryFout = stdout; /* so it doesn't get closed */
+
+ /* open file/pipe */
+ if (!setQFout(pset.gfname))
+ {
+ pset.queryFout = queryFout_copy;
+ pset.queryFoutPipe = queryFoutPipe_copy;
+ OK = false;
+ goto cleanup;
+ }
+ }
+
+ /* clear any pre-existing error indication on the output stream */
+ clearerr(pset.queryFout);
+
+ for (;;)
+ {
+ if (pset.timing)
+ INSTR_TIME_SET_CURRENT(before);
+
+ /* get FETCH_COUNT tuples at a time */
+ results = PQexec(pset.db, fetch_cmd);
+
+ if (pset.timing)
+ {
+ INSTR_TIME_SET_CURRENT(after);
+ INSTR_TIME_SUBTRACT(after, before);
+ *elapsed_msec += INSTR_TIME_GET_MILLISEC(after);
+ }
+
+ if (PQresultStatus(results) != PGRES_TUPLES_OK)
+ {
+ /* shut down pager before printing error message */
+ if (did_pager)
+ {
+ ClosePager(pset.queryFout);
+ pset.queryFout = queryFout_copy;
+ pset.queryFoutPipe = queryFoutPipe_copy;
+ did_pager = false;
+ }
+
+ OK = AcceptResult(results);
+ psql_assert(!OK);
+ PQclear(results);
+ break;
+ }
+
+ ntuples = PQntuples(results);
+
+ if (ntuples < pset.fetch_count)
+ {
+ /* this is the last result set, so allow footer decoration */
+ my_popt.topt.stop_table = true;
+ }
+ else if (pset.queryFout == stdout && !did_pager)
+ {
+ /*
+ * If query requires multiple result sets, hack to ensure that
+ * only one pager instance is used for the whole mess
+ */
+ pset.queryFout = PageOutput(100000, my_popt.topt.pager);
+ did_pager = true;
+ }
+
+ printQuery(results, &my_popt, pset.queryFout, pset.logfile);
+
+ PQclear(results);
+
+ /* after the first result set, disallow header decoration */
+ my_popt.topt.start_table = false;
+ my_popt.topt.prior_records += ntuples;
+
+ /*
+ * Make sure to flush the output stream, so intermediate results are
+ * visible to the client immediately. We check the results because if
+ * the pager dies/exits/etc, there's no sense throwing more data at
+ * it.
+ */
+ flush_error = fflush(pset.queryFout);
+
+ /*
+ * Check if we are at the end, if a cancel was pressed, or if there
+ * were any errors either trying to flush out the results, or more
+ * generally on the output stream at all. If we hit any errors
+ * writing things to the stream, we presume $PAGER has disappeared and
+ * stop bothering to pull down more data.
+ */
+ if (ntuples < pset.fetch_count || cancel_pressed || flush_error ||
+ ferror(pset.queryFout))
+ break;
+ }
+
+ /* close \g argument file/pipe, restore old setting */
+ if (pset.gfname)
+ {
+ /* keep this code in sync with PrintQueryTuples */
+ setQFout(NULL);
+
+ pset.queryFout = queryFout_copy;
+ pset.queryFoutPipe = queryFoutPipe_copy;
+
+ free(pset.gfname);
+ pset.gfname = NULL;
+ }
+ else if (did_pager)
+ {
+ ClosePager(pset.queryFout);
+ pset.queryFout = queryFout_copy;
+ pset.queryFoutPipe = queryFoutPipe_copy;
+ }
+
+cleanup:
+ if (pset.timing)
+ INSTR_TIME_SET_CURRENT(before);
/*
- * First we must advance over any whitespace and comments.
+ * We try to close the cursor on either success or failure, but on failure
+ * ignore the result (it's probably just a bleat about being in an aborted
+ * transaction)
*/
+ results = PQexec(pset.db, "CLOSE _psql_cursor");
+ if (OK)
+ {
+ OK = AcceptResult(results) &&
+ (PQresultStatus(results) == PGRES_COMMAND_OK);
+ }
+ PQclear(results);
+
+ if (started_txn)
+ {
+ results = PQexec(pset.db, OK ? "COMMIT" : "ROLLBACK");
+ OK &= AcceptResult(results) &&
+ (PQresultStatus(results) == PGRES_COMMAND_OK);
+ PQclear(results);
+ }
+
+ if (pset.timing)
+ {
+ INSTR_TIME_SET_CURRENT(after);
+ INSTR_TIME_SUBTRACT(after, before);
+ *elapsed_msec += INSTR_TIME_GET_MILLISEC(after);
+ }
+
+ return OK;
+}
+
+
+/*
+ * Advance the given char pointer over white space and SQL comments.
+ */
+static const char *
+skip_white_space(const char *query)
+{
+ int cnestlevel = 0; /* slash-star comment nest level */
+
while (*query)
{
+ int mblen = PQmblen(query, pset.encoding);
+
+ /*
+ * Note: we assume the encoding is a superset of ASCII, so that for
+ * example "query[0] == '/'" is meaningful. However, we do NOT assume
+ * that the second and subsequent bytes of a multibyte character
+ * couldn't look like ASCII characters; so it is critical to advance
+ * by mblen, not 1, whenever we haven't exactly identified the
+ * character we are skipping over.
+ */
if (isspace((unsigned char) *query))
- query++;
- else if (query[0] == '-' && query[1] == '-')
+ query += mblen;
+ else if (query[0] == '/' && query[1] == '*')
{
+ cnestlevel++;
query += 2;
- while (*query && *query != '\n')
- query++;
}
- else if (query[0] == '/' && query[1] == '*')
+ else if (cnestlevel > 0 && query[0] == '*' && query[1] == '/')
+ {
+ cnestlevel--;
+ query += 2;
+ }
+ else if (cnestlevel == 0 && query[0] == '-' && query[1] == '-')
{
query += 2;
+
+ /*
+ * We have to skip to end of line since any slash-star inside the
+ * -- comment does NOT start a slash-star comment.
+ */
while (*query)
{
- if (query[0] == '*' && query[1] == '/')
+ if (*query == '\n')
{
- query += 2;
+ query++;
break;
}
- else
- query++;
+ query += PQmblen(query, pset.encoding);
}
}
+ else if (cnestlevel > 0)
+ query += mblen;
else
break; /* found first token */
}
+ return query;
+}
+
+
+/*
+ * Check whether a command is one of those for which we should NOT start
+ * a new transaction block (ie, send a preceding BEGIN).
+ *
+ * These include the transaction control statements themselves, plus
+ * certain statements that the backend disallows inside transaction blocks.
+ */
+static bool
+command_no_begin(const char *query)
+{
+ int wordlen;
+
+ /*
+ * First we must advance over any whitespace and comments.
+ */
+ query = skip_white_space(query);
+
/*
- * Check word length ("beginx" is not "begin").
+ * Check word length (since "beginx" is not "begin").
*/
wordlen = 0;
while (isalpha((unsigned char) query[wordlen]))
- wordlen++;
+ wordlen += PQmblen(&query[wordlen], pset.encoding);
- if (wordlen == 5 && strncasecmp(query, "begin", 5) == 0)
+ /*
+ * Transaction control commands. These should include every keyword that
+ * gives rise to a TransactionStmt in the backend grammar, except for the
+ * savepoint-related commands.
+ *
+ * (We assume that START must be START TRANSACTION, since there is
+ * presently no other "START foo" command.)
+ */
+ if (wordlen == 5 && pg_strncasecmp(query, "abort", 5) == 0)
+ return true;
+ if (wordlen == 5 && pg_strncasecmp(query, "begin", 5) == 0)
return true;
- if (wordlen == 6 && strncasecmp(query, "commit", 6) == 0)
+ if (wordlen == 5 && pg_strncasecmp(query, "start", 5) == 0)
return true;
- if (wordlen == 8 && strncasecmp(query, "rollback", 8) == 0)
+ if (wordlen == 6 && pg_strncasecmp(query, "commit", 6) == 0)
return true;
- if (wordlen == 5 && strncasecmp(query, "abort", 5) == 0)
+ if (wordlen == 3 && pg_strncasecmp(query, "end", 3) == 0)
return true;
- if (wordlen == 3 && strncasecmp(query, "end", 3) == 0)
+ if (wordlen == 8 && pg_strncasecmp(query, "rollback", 8) == 0)
return true;
- if (wordlen == 5 && strncasecmp(query, "start", 5) == 0)
+ if (wordlen == 7 && pg_strncasecmp(query, "prepare", 7) == 0)
+ {
+ /* PREPARE TRANSACTION is a TC command, PREPARE foo is not */
+ query += wordlen;
+
+ query = skip_white_space(query);
+
+ wordlen = 0;
+ while (isalpha((unsigned char) query[wordlen]))
+ wordlen += PQmblen(&query[wordlen], pset.encoding);
+
+ if (wordlen == 11 && pg_strncasecmp(query, "transaction", 11) == 0)
+ return true;
+ return false;
+ }
+
+ /*
+ * Commands not allowed within transactions. The statements checked for
+ * here should be exactly those that call PreventTransactionChain() in the
+ * backend.
+ */
+ if (wordlen == 6 && pg_strncasecmp(query, "vacuum", 6) == 0)
return true;
+ if (wordlen == 7 && pg_strncasecmp(query, "cluster", 7) == 0)
+ {
+ /* CLUSTER with any arguments is allowed in transactions */
+ query += wordlen;
+
+ query = skip_white_space(query);
+
+ if (isalpha((unsigned char) query[0]))
+ return false; /* has additional words */
+ return true; /* it's CLUSTER without arguments */
+ }
+
+ if (wordlen == 6 && pg_strncasecmp(query, "create", 6) == 0)
+ {
+ query += wordlen;
+
+ query = skip_white_space(query);
+
+ wordlen = 0;
+ while (isalpha((unsigned char) query[wordlen]))
+ wordlen += PQmblen(&query[wordlen], pset.encoding);
+
+ if (wordlen == 8 && pg_strncasecmp(query, "database", 8) == 0)
+ return true;
+ if (wordlen == 10 && pg_strncasecmp(query, "tablespace", 10) == 0)
+ return true;
+
+ /* CREATE [UNIQUE] INDEX CONCURRENTLY isn't allowed in xacts */
+ if (wordlen == 6 && pg_strncasecmp(query, "unique", 6) == 0)
+ {
+ query += wordlen;
+
+ query = skip_white_space(query);
+
+ wordlen = 0;
+ while (isalpha((unsigned char) query[wordlen]))
+ wordlen += PQmblen(&query[wordlen], pset.encoding);
+ }
+
+ if (wordlen == 5 && pg_strncasecmp(query, "index", 5) == 0)
+ {
+ query += wordlen;
+
+ query = skip_white_space(query);
+
+ wordlen = 0;
+ while (isalpha((unsigned char) query[wordlen]))
+ wordlen += PQmblen(&query[wordlen], pset.encoding);
+
+ if (wordlen == 12 && pg_strncasecmp(query, "concurrently", 12) == 0)
+ return true;
+ }
+
+ return false;
+ }
+
+ /*
+ * Note: these tests will match DROP SYSTEM and REINDEX TABLESPACE, which
+ * aren't really valid commands so we don't care much. The other four
+ * possible matches are correct.
+ */
+ if ((wordlen == 4 && pg_strncasecmp(query, "drop", 4) == 0) ||
+ (wordlen == 7 && pg_strncasecmp(query, "reindex", 7) == 0))
+ {
+ query += wordlen;
+
+ query = skip_white_space(query);
+
+ wordlen = 0;
+ while (isalpha((unsigned char) query[wordlen]))
+ wordlen += PQmblen(&query[wordlen], pset.encoding);
+
+ if (wordlen == 8 && pg_strncasecmp(query, "database", 8) == 0)
+ return true;
+ if (wordlen == 6 && pg_strncasecmp(query, "system", 6) == 0)
+ return true;
+ if (wordlen == 10 && pg_strncasecmp(query, "tablespace", 10) == 0)
+ return true;
+ }
return false;
}
-char
-parse_char(char **buf)
+/*
+ * Check whether the specified command is a SELECT (or VALUES).
+ */
+static bool
+is_select_command(const char *query)
{
- long l;
+ int wordlen;
+
+ /*
+ * First advance over any whitespace, comments and left parentheses.
+ */
+ for (;;)
+ {
+ query = skip_white_space(query);
+ if (query[0] == '(')
+ query++;
+ else
+ break;
+ }
+
+ /*
+ * Check word length (since "selectx" is not "select").
+ */
+ wordlen = 0;
+ while (isalpha((unsigned char) query[wordlen]))
+ wordlen += PQmblen(&query[wordlen], pset.encoding);
+
+ if (wordlen == 6 && pg_strncasecmp(query, "select", 6) == 0)
+ return true;
- l = strtol(*buf, buf, 0);
- --*buf;
- return (char) l;
+ if (wordlen == 6 && pg_strncasecmp(query, "values", 6) == 0)
+ return true;
+
+ return false;
}
}
+/*
+ * Test if the current session uses standard string literals.
+ *
+ * Note: With a pre-protocol-3.0 connection this will always say "false",
+ * which should be the right answer.
+ */
+bool
+standard_strings(void)
+{
+ const char *val;
+
+ if (!pset.db)
+ return false;
+
+ val = PQparameterStatus(pset.db, "standard_conforming_strings");
+
+ if (val && strcmp(val, "on") == 0)
+ return true;
+
+ return false;
+}
+
+
/*
* Return the session user of the current connection.
*
if (!filename || !(*filename))
return NULL;
- /* MSDOS uses tilde for short versions of long file names, so skip it. */
+ /*
+ * WIN32 doesn't use tilde expansion for file names. Also, it uses tilde
+ * for short versions of long file names, though the tilde is usually
+ * toward the end, not at the beginning.
+ */
#ifndef WIN32
/* try tilde expansion */
if (**filename == '~')
{
char *fn;
- char *home;
char oldp,
*p;
struct passwd *pw;
+ char home[MAXPGPATH];
fn = *filename;
- home = NULL;
+ *home = '\0';
p = fn + 1;
while (*p != '/' && *p != '\0')
*p = '\0';
if (*(fn + 1) == '\0')
- home = getenv("HOME");
+ get_home_path(home); /* ~ or ~/ only */
else if ((pw = getpwnam(fn + 1)) != NULL)
- home = pw->pw_dir;
+ strlcpy(home, pw->pw_dir, sizeof(home)); /* ~user */
*p = oldp;
- if (home)
+ if (strlen(home) != 0)
{
char *newfn;
- newfn = malloc(strlen(home) + strlen(p) + 1);
- if (!newfn)
- {
- psql_error("out of memory\n");
- exit(EXIT_FAILURE);
- }
+ newfn = pg_malloc(strlen(home) + strlen(p) + 1);
strcpy(newfn, home);
strcat(newfn, p);
projects / postgresql / blobdiff