From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Tue, 21 Jul 2009 21:46:10 +0000 (+0000)
Subject: Make pg_dump/pg_restore --clean options drop large objects too.
X-Git-Url: http://waps.l3s.uni-hannover.de/gitweb/?a=commitdiff_plain;h=1c1f2b82bb65539494492035c46b276639717438;p=users%2Fsimon%2Fpostgres.git

Make pg_dump/pg_restore --clean options drop large objects too.
In passing, make invocations of lo_xxx functions a bit more schema-safe.

Itagaki Takahiro
---

diff --git a/src/bin/pg_dump/pg_backup_archiver.c b/src/bin/pg_dump/pg_backup_archiver.c
index e502825066..fe4841a94e 100644
--- a/src/bin/pg_dump/pg_backup_archiver.c
+++ b/src/bin/pg_dump/pg_backup_archiver.c
@@ -895,7 +895,7 @@ EndRestoreBlobs(ArchiveHandle *AH)
  * Called by a format handler to initiate restoration of a blob
  */
 void
-StartRestoreBlob(ArchiveHandle *AH, Oid oid)
+StartRestoreBlob(ArchiveHandle *AH, Oid oid, bool drop)
 {
 	Oid			loOid;
 
@@ -906,6 +906,10 @@ StartRestoreBlob(ArchiveHandle *AH, Oid oid)
 
 	ahlog(AH, 2, "restoring large object with OID %u\n", oid);
 
+	if (drop)
+		ahprintf(AH, "SELECT CASE WHEN EXISTS(SELECT 1 FROM pg_catalog.pg_largeobject WHERE loid = '%u') THEN pg_catalog.lo_unlink('%u') END;\n",
+				 oid, oid);
+
 	if (AH->connection)
 	{
 		loOid = lo_create(AH->connection, oid);
@@ -919,7 +923,8 @@ StartRestoreBlob(ArchiveHandle *AH, Oid oid)
 	}
 	else
 	{
-		ahprintf(AH, "SELECT lo_open(lo_create(%u), %d);\n", oid, INV_WRITE);
+		ahprintf(AH, "SELECT pg_catalog.lo_open(pg_catalog.lo_create('%u'), %d);\n",
+				 oid, INV_WRITE);
 	}
 
 	AH->writingBlob = 1;
@@ -943,7 +948,7 @@ EndRestoreBlob(ArchiveHandle *AH, Oid oid)
 	}
 	else
 	{
-		ahprintf(AH, "SELECT lo_close(0);\n\n");
+		ahprintf(AH, "SELECT pg_catalog.lo_close(0);\n\n");
 	}
 }
 
@@ -1254,7 +1259,7 @@ dump_lo_buf(ArchiveHandle *AH)
 
 		/* Hack: turn off writingBlob so ahwrite doesn't recurse to here */
 		AH->writingBlob = 0;
-		ahprintf(AH, "SELECT lowrite(0, '%s');\n", str);
+		ahprintf(AH, "SELECT pg_catalog.lowrite(0, '%s');\n", str);
 		AH->writingBlob = 1;
 
 		free(str);
diff --git a/src/bin/pg_dump/pg_backup_archiver.h b/src/bin/pg_dump/pg_backup_archiver.h
index cd9d48c11f..5c779bdcef 100644
--- a/src/bin/pg_dump/pg_backup_archiver.h
+++ b/src/bin/pg_dump/pg_backup_archiver.h
@@ -355,7 +355,7 @@ int			ReadOffset(ArchiveHandle *, pgoff_t *);
 size_t		WriteOffset(ArchiveHandle *, pgoff_t, int);
 
 extern void StartRestoreBlobs(ArchiveHandle *AH);
-extern void StartRestoreBlob(ArchiveHandle *AH, Oid oid);
+extern void StartRestoreBlob(ArchiveHandle *AH, Oid oid, bool drop);
 extern void EndRestoreBlob(ArchiveHandle *AH, Oid oid);
 extern void EndRestoreBlobs(ArchiveHandle *AH);
 
diff --git a/src/bin/pg_dump/pg_backup_custom.c b/src/bin/pg_dump/pg_backup_custom.c
index 25ab8cd6ce..d2857250d1 100644
--- a/src/bin/pg_dump/pg_backup_custom.c
+++ b/src/bin/pg_dump/pg_backup_custom.c
@@ -54,7 +54,7 @@ static void _StartBlobs(ArchiveHandle *AH, TocEntry *te);
 static void _StartBlob(ArchiveHandle *AH, TocEntry *te, Oid oid);
 static void _EndBlob(ArchiveHandle *AH, TocEntry *te, Oid oid);
 static void _EndBlobs(ArchiveHandle *AH, TocEntry *te);
-static void _LoadBlobs(ArchiveHandle *AH);
+static void _LoadBlobs(ArchiveHandle *AH, bool drop);
 static void _Clone(ArchiveHandle *AH);
 static void _DeClone(ArchiveHandle *AH);
 
@@ -501,7 +501,7 @@ _PrintTocData(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt)
 			break;
 
 		case BLK_BLOBS:
-			_LoadBlobs(AH);
+			_LoadBlobs(AH, ropt->dropSchema);
 			break;
 
 		default:				/* Always have a default */
@@ -622,7 +622,7 @@ _PrintData(ArchiveHandle *AH)
 }
 
 static void
-_LoadBlobs(ArchiveHandle *AH)
+_LoadBlobs(ArchiveHandle *AH, bool drop)
 {
 	Oid			oid;
 
@@ -631,7 +631,7 @@ _LoadBlobs(ArchiveHandle *AH)
 	oid = ReadInt(AH);
 	while (oid != 0)
 	{
-		StartRestoreBlob(AH, oid);
+		StartRestoreBlob(AH, oid, drop);
 		_PrintData(AH);
 		EndRestoreBlob(AH, oid);
 		oid = ReadInt(AH);
diff --git a/src/bin/pg_dump/pg_backup_files.c b/src/bin/pg_dump/pg_backup_files.c
index 8faa5e8db9..1faac0a491 100644
--- a/src/bin/pg_dump/pg_backup_files.c
+++ b/src/bin/pg_dump/pg_backup_files.c
@@ -382,7 +382,7 @@ _LoadBlobs(ArchiveHandle *AH, RestoreOptions *ropt)
 
 	while (oid != 0)
 	{
-		StartRestoreBlob(AH, oid);
+		StartRestoreBlob(AH, oid, ropt->dropSchema);
 		_PrintFileData(AH, fname, ropt);
 		EndRestoreBlob(AH, oid);
 		_getBlobTocEntry(AH, &oid, fname);
diff --git a/src/bin/pg_dump/pg_backup_null.c b/src/bin/pg_dump/pg_backup_null.c
index 2baab210b2..2ae7351cc1 100644
--- a/src/bin/pg_dump/pg_backup_null.c
+++ b/src/bin/pg_dump/pg_backup_null.c
@@ -108,7 +108,7 @@ _WriteBlobData(ArchiveHandle *AH, const void *data, size_t dLen)
 		if (!str)
 			die_horribly(AH, NULL, "out of memory\n");
 
-		ahprintf(AH, "SELECT lowrite(0, '%s');\n", str);
+		ahprintf(AH, "SELECT pg_catalog.lowrite(0, '%s');\n", str);
 
 		free(str);
 	}
@@ -149,7 +149,12 @@ _StartBlob(ArchiveHandle *AH, TocEntry *te, Oid oid)
 	if (oid == 0)
 		die_horribly(AH, NULL, "invalid OID for large object\n");
 
-	ahprintf(AH, "SELECT lo_open(lo_create(%u), %d);\n", oid, INV_WRITE);
+	if (AH->ropt->dropSchema)
+		ahprintf(AH, "SELECT CASE WHEN EXISTS(SELECT 1 FROM pg_catalog.pg_largeobject WHERE loid = '%u') THEN pg_catalog.lo_unlink('%u') END;\n",
+				 oid, oid);
+
+	ahprintf(AH, "SELECT pg_catalog.lo_open(pg_catalog.lo_create('%u'), %d);\n",
+			 oid, INV_WRITE);
 
 	AH->WriteDataPtr = _WriteBlobData;
 }
@@ -164,7 +169,7 @@ _EndBlob(ArchiveHandle *AH, TocEntry *te, Oid oid)
 {
 	AH->WriteDataPtr = _WriteData;
 
-	ahprintf(AH, "SELECT lo_close(0);\n\n");
+	ahprintf(AH, "SELECT pg_catalog.lo_close(0);\n\n");
 }
 
 /*
diff --git a/src/bin/pg_dump/pg_backup_tar.c b/src/bin/pg_dump/pg_backup_tar.c
index 0fab94e308..b5e0c43e88 100644
--- a/src/bin/pg_dump/pg_backup_tar.c
+++ b/src/bin/pg_dump/pg_backup_tar.c
@@ -729,7 +729,7 @@ _LoadBlobs(ArchiveHandle *AH, RestoreOptions *ropt)
 			{
 				ahlog(AH, 1, "restoring large object OID %u\n", oid);
 
-				StartRestoreBlob(AH, oid);
+				StartRestoreBlob(AH, oid, ropt->dropSchema);
 
 				while ((cnt = tarRead(buf, 4095, th)) > 0)
 				{