Postgres95 1.01 Distribution - Virgin Sources

2025-11-09 06:21:09 +03:00 · 1996-07-09 06:22:35 +00:00
commit d31084e9d1
868 changed files with 242656 additions and 0 deletions
--- a/src/interfaces/libpq++/pglobject.cc
+++ b/src/interfaces/libpq++/pglobject.cc
@@ -0,0 +1,152 @@
+
+/*-------------------------------------------------------------------------
+ *
+ *   FILE
+ *	pglobject.cc
+ *
+ *   DESCRIPTION
+ *      implementation of the PGlobj class.
+ *   PGlobj encapsulates a frontend to backend connection
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *    $Header: /cvsroot/pgsql/src/interfaces/libpq++/Attic/pglobject.cc,v 1.1.1.1 1996/07/09 06:22:18 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "libpq++.H"
+
+extern "C" {
+#include "libpq/libpq-fs.h"
+}
+
+// default constructor
+// creates a large object in the default database
+PGlobj::PGlobj() : PGconnection::PGconnection() {
+  object = lo_creat(conn, INV_READ|INV_WRITE);
+  if (object == 0) {
+    sprintf(errorMessage, "PGlobj: can't create large object");
+  }
+  fd = lo_open(conn, object, INV_READ|INV_WRITE);
+  if (fd < 0) {
+    sprintf(errorMessage, "PGlobj: can't open large object %d", object);
+  } else
+    sprintf(errorMessage, "PGlobj: created and opened large object %d",
+	    object);
+   
+}
+
+// constructor
+// open an existing large object in the default database
+PGlobj::PGlobj(Oid lobjId) : PGconnection::PGconnection() {
+  object = lobjId;
+  fd = lo_open(conn, object, INV_READ|INV_WRITE);
+  if (fd < 0) {
+    sprintf(errorMessage, "PGlobj: can't open large object %d", object);
+  } else
+    sprintf(errorMessage, "PGlobj: opened large object %d",
+	    object);
+}
+
+// constructor
+// create a large object in the given database
+PGlobj::PGlobj(PGenv* env, char* dbName) : PGconnection::PGconnection(env,dbName) {
+  object = lo_creat(conn, INV_READ|INV_WRITE);
+  if (object == 0) {
+    sprintf(errorMessage, "PGlobj: can't create large object");
+  }
+  fd = lo_open(conn, object, INV_READ|INV_WRITE);
+  if (fd < 0) {
+    sprintf(errorMessage, "PGlobj: can't open large object %d", object);
+  } else
+    sprintf(errorMessage, "PGlobj: created and opened large object %d",
+	    object);
+}
+
+// constructor
+// open an existing large object in the given database
+PGlobj::PGlobj(PGenv* env, char* dbName, Oid lobjId) : PGconnection::PGconnection(env,dbName) {
+  object = lobjId;
+  fd = lo_open(conn, object, INV_READ|INV_WRITE);
+  if (fd < 0) {
+    sprintf(errorMessage, "PGlobj: can't open large object %d", object);
+  } else
+    sprintf(errorMessage, "PGlobj: created and opened large object %d",
+	    object);
+}
+
+// PGlobj::unlink
+// destruct large object and delete from it from the database
+int
+PGlobj::unlink() {
+  int temp = lo_unlink(conn, object);
+  if (temp) {
+    return temp;
+  } else {
+    delete this;
+    return temp;
+  }
+}
+
+// PGlobj::import -- import a given file into the large object
+int
+PGlobj::import(char* filename) {
+    char buf[BUFSIZE];
+    int nbytes, tmp;
+    int in_fd;
+
+    // open the file to be read in
+    in_fd = open(filename, O_RDONLY, 0666);
+    if (in_fd < 0)  {   /* error */
+	sprintf(errorMessage, "PGlobj::import: can't open unix file\"%s\"", filename);
+	return -1;
+    }
+
+    // read in from the Unix file and write to the inversion file
+    while ((nbytes = ::read(in_fd, buf, BUFSIZE)) > 0) {
+      tmp = lo_write(conn, fd, buf, nbytes);
+      if (tmp < nbytes) {
+       sprintf(errorMessage, "PGlobj::import: error while reading \"%s\"",
+         filename);
+	  return -1;
+      }
+    }
+    
+    (void) close(in_fd);
+    return 0;
+}
+
+// PGlobj::export -- export large object to given file
+int
+PGlobj::export(char* filename) {
+    int out_fd;
+    char buf[BUFSIZE];
+    int nbytes, tmp;
+
+    // open the file to be written to
+    out_fd = open(filename, O_CREAT|O_WRONLY, 0666);
+    if (out_fd < 0)  {   /* error */
+	sprintf(errorMessage, "PGlobj::export: can't open unix file\"%s\"",
+		filename);
+	return -1;
+    }
+
+    // read in from the Unix file and write to the inversion file
+    while ((nbytes = lo_read(conn, fd, buf, BUFSIZE)) > 0) {
+      tmp = ::write(out_fd, buf, nbytes);
+      if (tmp < nbytes) {
+        sprintf(errorMessage,"PGlobj::export: error while writing \"%s\"",
+	    filename);
+	return -1;
+      }
+    }
+    (void) close(out_fd);
+    return 0;
+}
+
+// default destructor -- closes large object
+PGlobj::~PGlobj() {
+  if (fd >= 0)
+    lo_close(conn, fd);
+}