Merged revisions 145751 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r145751 | tilghman | 2008-10-02 10:13:21 -0500 (Thu, 02 Oct 2008) | 3 lines
  
  Some sanity checks that may have led to prior crashes, found by codefreeze-lap
  (murf) on IRC.  Also some cleanup of incorrectly-used constants.
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@145752 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_odbc.c

@@ -758,17 +758,23 @@ static odbc_status odbc_obj_disconnect(struct odbc_obj *obj)
 	short int mlen;
 	unsigned char msg[200], stat[10];
 
+	/* Nothing to disconnect */
+	if (!obj->con) {
+		return ODBC_SUCCESS;
+	}
+
 	ast_mutex_lock(&obj->lock);
 
 	res = SQLDisconnect(obj->con);
 
-	if (res == ODBC_SUCCESS) {
+	if (res == SQL_SUCCESS || res == SQL_SUCCESS_WITH_INFO) {
 		ast_log(LOG_DEBUG, "Disconnected %d from %s [%s]\n", res, obj->parent->name, obj->parent->dsn);
 	} else {
 		ast_log(LOG_DEBUG, "res_odbc: %s [%s] already disconnected\n", obj->parent->name, obj->parent->dsn);
 	}
 
-	if ((res = SQLFreeHandle(SQL_HANDLE_DBC, obj->con) == ODBC_SUCCESS)) {
+	if ((res = SQLFreeHandle(SQL_HANDLE_DBC, obj->con) == SQL_SUCCESS)) {
+		obj->con = NULL;
 		ast_log(LOG_DEBUG, "Database handle deallocated\n");
 	} else {
 		SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, 1, stat, &err, msg, 100, &mlen);
@@ -792,6 +798,13 @@ static odbc_status odbc_obj_connect(struct odbc_obj *obj)
 #endif
 	ast_mutex_lock(&obj->lock);
 
+	if (obj->up) {
+		odbc_obj_disconnect(obj);
+		ast_log(LOG_NOTICE, "Re-connecting %s\n", obj->parent->name);
+	} else {
+		ast_log(LOG_NOTICE, "Connecting %s\n", obj->parent->name);
+	}
+
 	res = SQLAllocHandle(SQL_HANDLE_DBC, obj->parent->env, &obj->con);
 
 	if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
@@ -806,13 +819,6 @@ static odbc_status odbc_obj_connect(struct odbc_obj *obj)
 	SQLSetConnectAttr(obj->con, SQL_ATTR_TRACEFILE, tracefile, strlen(tracefile));
 #endif
 
-	if (obj->up) {
-		odbc_obj_disconnect(obj);
-		ast_log(LOG_NOTICE, "Re-connecting %s\n", obj->parent->name);
-	} else {
-		ast_log(LOG_NOTICE, "Connecting %s\n", obj->parent->name);
-	}
-
 	res = SQLConnect(obj->con,
 		   (SQLCHAR *) obj->parent->dsn, SQL_NTS,
 		   (SQLCHAR *) obj->parent->username, SQL_NTS,