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Improve pg_dump and psql to use libpq's newer COPY support routines, 

instead of the old deprecated ones.
Volkan Yazici, with some editorializing by moi.
This commit is contained in:
Tom Lane 2006-03-03 23:38:30 +00:00
parent 0b1b010c12
commit decdaf3592
4 changed files with 145 additions and 134 deletions
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27
src/bin/pg_dump/pg_backup_db.c
View File

@ -5,7 +5,7 @@
* Implements the basic DB functions used by the archiver.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_backup_db.c,v 1.69 2006/02/12 06:11:50 momjian Exp $
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_backup_db.c,v 1.70 2006/03/03 23:38:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -391,22 +391,29 @@ _sendCopyLine(ArchiveHandle *AH, char *qry, char *eos)
* enter COPY mode; this allows us to behave reasonably when trying
* to continue after an error in a COPY command.
*/
if (AH->pgCopyIn && PQputline(AH->connection, AH->pgCopyBuf->data) != 0)
die_horribly(AH, modulename, "error returned by PQputline: %s",
if (AH->pgCopyIn &&
PQputCopyData(AH->connection, AH->pgCopyBuf->data,
AH->pgCopyBuf->len) <= 0)
die_horribly(AH, modulename, "error returned by PQputCopyData: %s",
PQerrorMessage(AH->connection));
resetPQExpBuffer(AH->pgCopyBuf);
/*
* fprintf(stderr, "Buffer is '%s'\n", AH->pgCopyBuf->data);
*/
if (isEnd)
if (isEnd && AH->pgCopyIn)
{
if (AH->pgCopyIn && PQendcopy(AH->connection) != 0)
die_horribly(AH, modulename, "error returned by PQendcopy: %s",
PGresult *res;
if (PQputCopyEnd(AH->connection, NULL) <= 0)
die_horribly(AH, modulename, "error returned by PQputCopyEnd: %s",
PQerrorMessage(AH->connection));
/* Check command status and return to normal libpq state */
res = PQgetResult(AH->connection);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
warn_or_die_horribly(AH, modulename, "COPY failed: %s",
PQerrorMessage(AH->connection));
PQclear(res);
AH->pgCopyIn = false;
}

51
src/bin/pg_dump/pg_dump.c
View File

@ -12,7 +12,7 @@
* by PostgreSQL
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.431 2006/03/02 01:18:25 tgl Exp $
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.432 2006/03/03 23:38:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -831,8 +831,6 @@ selectDumpableObject(DumpableObject *dobj)
* to be dumped.
*/
#define COPYBUFSIZ 8192
static int
dumpTableData_copy(Archive *fout, void *dcontext)
{
@ -844,8 +842,7 @@ dumpTableData_copy(Archive *fout, void *dcontext)
PQExpBuffer q = createPQExpBuffer();
PGresult *res;
int ret;
bool copydone;
char copybuf[COPYBUFSIZ];
char *copybuf;
const char *column_list;
if (g_verbose)
@ -886,33 +883,19 @@ dumpTableData_copy(Archive *fout, void *dcontext)
}
res = PQexec(g_conn, q->data);
check_sql_result(res, g_conn, q->data, PGRES_COPY_OUT);
PQclear(res);
copydone = false;
while (!copydone)
for (;;)
{
ret = PQgetline(g_conn, copybuf, COPYBUFSIZ);
ret = PQgetCopyData(g_conn, &copybuf, 0);
if (copybuf[0] == '\\' &&
copybuf[1] == '.' &&
copybuf[2] == '\0')
if (ret < 0)
break; /* done or error */
if (copybuf)
{
copydone = true; /* don't print this... */
}
else
{
archputs(copybuf, fout);
switch (ret)
{
case EOF:
copydone = true;
/* FALLTHROUGH */
case 0:
archputs("\n", fout);
break;
case 1:
break;
}
WriteData(fout, copybuf, ret);
PQfreemem(copybuf);
}
/*
@ -920,7 +903,7 @@ dumpTableData_copy(Archive *fout, void *dcontext)
*
* There was considerable discussion in late July, 2000 regarding
* slowing down pg_dump when backing up large tables. Users with both
* slow & fast (muti-processor) machines experienced performance
* slow & fast (multi-processor) machines experienced performance
* degradation when doing a backup.
*
* Initial attempts based on sleeping for a number of ms for each ms
@ -957,16 +940,20 @@ dumpTableData_copy(Archive *fout, void *dcontext)
}
archprintf(fout, "\\.\n\n\n");
ret = PQendcopy(g_conn);
if (ret != 0)
if (ret == -2)
{
write_msg(NULL, "SQL command to dump the contents of table \"%s\" failed: PQendcopy() failed.\n", classname);
/* copy data transfer failed */
write_msg(NULL, "Dumping the contents of table \"%s\" failed: PQgetCopyData() failed.\n", classname);
write_msg(NULL, "Error message from server: %s", PQerrorMessage(g_conn));
write_msg(NULL, "The command was: %s\n", q->data);
exit_nicely();
}
/* Check command status and return to normal libpq state */
res = PQgetResult(g_conn);
check_sql_result(res, g_conn, q->data, PGRES_COMMAND_OK);
PQclear(res);
destroyPQExpBuffer(q);
return 1;
}

11
src/bin/psql/common.c
View File

@ -3,7 +3,7 @@
*
* Copyright (c) 2000-2005, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.112 2006/02/12 03:30:21 tgl Exp $
* $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.113 2006/03/03 23:38:30 tgl Exp $
*/
#include "postgres_fe.h"
#include "common.h"
@ -685,7 +685,10 @@ AcceptResult(const PGresult *result, const char *query)
break;
case PGRES_COPY_OUT:
/* keep cancel connection for copy out state */
/*
* Keep cancel connection active during copy out state.
* The matching ResetCancelConn() is in handleCopyOut.
*/
SetCancelConn();
break;
@ -702,6 +705,7 @@ AcceptResult(const PGresult *result, const char *query)
psql_error("%s", error);
ReportSyntaxErrorPosition(result, query);
CheckConnection();
}
@ -720,6 +724,9 @@ AcceptResult(const PGresult *result, const char *query)
* 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".
*/

190
src/bin/psql/copy.c
View File

@ -3,7 +3,7 @@
*
* Copyright (c) 2000-2005, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/copy.c,v 1.58 2005/10/15 02:49:40 momjian Exp $
* $PostgreSQL: pgsql/src/bin/psql/copy.c,v 1.59 2006/03/03 23:38:30 tgl Exp $
*/
#include "postgres_fe.h"
#include "copy.h"
@ -568,7 +568,9 @@ do_copy(const char *args)
break;
default:
success = false;
psql_error("\\copy: unexpected response (%d)\n", PQresultStatus(result));
psql_error("\\copy: unexpected response (%d)\n",
PQresultStatus(result));
break;
}
PQclear(result);
@ -586,85 +588,92 @@ do_copy(const char *args)
}
#define COPYBUFSIZ 8192 /* size doesn't matter */
/*
* Functions for handling COPY IN/OUT data transfer.
*
* If you want to use COPY TO STDOUT/FROM STDIN in your application,
* this is the code to steal ;)
*/
/*
* handleCopyOut
* receives data as a result of a COPY ... TO stdout command
* receives data as a result of a COPY ... TO STDOUT command
*
* If you want to use COPY TO in your application, this is the code to steal :)
* conn should be a database connection that you just issued COPY TO on
* and got back a PGRES_COPY_OUT result.
* copystream is the file stream for the data to go to.
*
* conn should be a database connection that you just called COPY TO on
* (and which gave you PGRES_COPY_OUT back);
* copystream is the file stream you want the output to go to
* result is true if successful, false if not.
*/
bool
handleCopyOut(PGconn *conn, FILE *copystream)
{
bool copydone = false; /* haven't started yet */
char copybuf[COPYBUFSIZ];
int ret;
bool OK = true;
char *buf;
int ret;
PGresult *res;
while (!copydone)
for (;;)
{
ret = PQgetline(conn, copybuf, COPYBUFSIZ);
ret = PQgetCopyData(conn, &buf, 0);
if (copybuf[0] == '\\' &&
copybuf[1] == '.' &&
copybuf[2] == '\0')
if (ret < 0)
break; /* done or error */
if (buf)
{
copydone = true; /* we're at the end */
}
else
{
fputs(copybuf, copystream);
switch (ret)
{
case EOF:
copydone = true;
/* FALLTHROUGH */
case 0:
fputc('\n', copystream);
break;
case 1:
break;
}
fputs(buf, copystream);
PQfreemem(buf);
}
}
fflush(copystream);
ret = !PQendcopy(conn);
if (ret == -2)
{
psql_error("COPY data transfer failed: %s", PQerrorMessage(conn));
OK = false;
}
/* Check command status and return to normal libpq state */
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
psql_error("%s", PQerrorMessage(conn));
OK = false;
}
PQclear(res);
/* Disable cancel connection (see AcceptResult in common.c) */
ResetCancelConn();
return ret;
return OK;
}
/*
* handleCopyIn
* receives data as a result of a COPY ... FROM stdin command
* sends data to complete a COPY ... FROM STDIN command
*
* Again, if you want to use COPY FROM in your application, copy this.
* conn should be a database connection that you just issued COPY FROM on
* and got back a PGRES_COPY_IN result.
* copystream is the file stream to read the data from.
*
* conn should be a database connection that you just called COPY FROM on
* (and which gave you PGRES_COPY_IN back);
* copystream is the file stream you want the input to come from
* result is true if successful, false if not.
*/
/* read chunk size for COPY IN - size is not critical */
#define COPYBUFSIZ 8192
bool
handleCopyIn(PGconn *conn, FILE *copystream)
{
bool OK = true;
const char *prompt;
bool copydone = false;
bool firstload;
bool linedone;
bool saw_cr = false;
char copybuf[COPYBUFSIZ];
char *s;
int bufleft;
int c = 0;
int ret;
unsigned int linecount = 0;
char buf[COPYBUFSIZ];
PGresult *res;
/* Prompt if interactive input */
if (isatty(fileno(copystream)))
@ -684,64 +693,65 @@ handleCopyIn(PGconn *conn, FILE *copystream)
fputs(prompt, stdout);
fflush(stdout);
}
firstload = true;
linedone = false;
while (!linedone)
{ /* for each bufferload in line ... */
/* Fetch string until \n, EOF, or buffer full */
s = copybuf;
for (bufleft = COPYBUFSIZ - 1; bufleft > 0; bufleft--)
int linelen;
if (!fgets(buf, COPYBUFSIZ, copystream))
{
c = getc(copystream);
if (c == EOF)
{
linedone = true;
break;
}
*s++ = c;
if (c == '\n')
{
linedone = true;
break;
}
if (c == '\r')
saw_cr = true;
}
*s = '\0';
/* EOF with empty line-so-far? */
if (c == EOF && s == copybuf && firstload)
{
/*
* We are guessing a little bit as to the right line-ending
* here...
*/
if (saw_cr)
PQputline(conn, "\\.\r\n");
else
PQputline(conn, "\\.\n");
if (ferror(copystream))
OK = false;
copydone = true;
if (pset.cur_cmd_interactive)
puts("\\.");
break;
}
/* No, so pass the data to the backend */
PQputline(conn, copybuf);
/* Check for line consisting only of \. */
linelen = strlen(buf);
/* current line is done? */
if (linelen > 0 && buf[linelen-1] == '\n')
linedone = true;
/* check for EOF marker, but not on a partial line */
if (firstload)
{
if (strcmp(copybuf, "\\.\n") == 0 ||
strcmp(copybuf, "\\.\r\n") == 0)
if (strcmp(buf, "\\.\n") == 0 ||
strcmp(buf, "\\.\r\n") == 0)
{
copydone = true;
break;
}
firstload = false;
}
if (PQputCopyData(conn, buf, linelen) <= 0)
{
OK = false;
copydone = true;
break;
}
}
linecount++;
pset.lineno++;
}
ret = !PQendcopy(conn);
pset.lineno += linecount;
return ret;
/* Terminate data transfer */
if (PQputCopyEnd(conn,
OK ? NULL : _("aborted due to read failure")) <= 0)
OK = false;
/* Check command status and return to normal libpq state */
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
psql_error("%s", PQerrorMessage(conn));
OK = false;
}
PQclear(res);
return OK;
}