DBMS_DEFER, 2 of 2

DBMS_DEFER Package

Summary of Subprograms

Table 9-1 DBMS_DEFER Package Subprograms

Subprogram	Description
CALL Procedure	Builds a deferred call to a remote procedure.
COMMIT_WORK Procedure	Performs a transaction commit after checking for well-formed deferred remote procedure calls.
datatype_ARG Procedure	Provides the data that is to be passed to a deferred remote procedure call.
TRANSACTION Procedure	Indicates the start of a new deferred transaction.

CALL Procedure

This procedure builds a deferred call to a remote procedure.

Syntax

DBMS_DEFER.CALL (
   schema_name       IN   VARCHAR2,
   package_name      IN   VARCHAR2,
   proc_name         IN   VARCHAR2,
   arg_count         IN   NATURAL,
   { nodes           IN   node_list_t 
   | group_name      IN   VARCHAR2 :=''});

Note:
This procedure is overloaded. The nodes and group_name parameters are mutually exclusive.

Parameters

Table 9-2 CALL Procedure Parameters

Parameter	Description
schema_name	Name of the schema in which the stored procedure is located.
package_name	Name of the package containing the stored procedure. The stored procedure must be part of a package. Deferred calls to standalone procedures are not supported.
proc_name	Name of the remote procedure to which you want to defer a call.
arg_count	Number of parameters for the procedure. You must have one call to `DBMS_DEFER`.`datatype_ARG` for each of these parameters. Note: You must include all of the arguments for the procedure, even if some of the parameters have defaults.
nodes	A PL/SQL table of fully qualified database names to which you want to propagate the deferred call. The table is indexed starting at position 1 and ending when a `NULL` entry is found, or the `NO_DATA_FOUND` exception is raised. The data in the table is case insensitive. This argument is optional.
group_name	Reserved for internal use.

Exceptions

Table 9-3 CALL Procedure Exceptions

Exception	Description
ORA-23304 (malformedcall)	Previous call was not correctly formed.
ORA-23319	Parameter value is not appropriate.
ORA-23352	Destination list (specified by `nodes` or by a previous `DBMS_DEFER`.`TRANSACTION` call) contains duplicates.

COMMIT_WORK Procedure

This procedure performs a transaction commit after checking for well-formed deferred remote procedure calls.

Syntax

DBMS_DEFER.COMMIT_WORK (
   commit_work_comment IN VARCHAR2);

Parameters

Table 9-4 COMMIT_WORK Procedure Parameters

Parameter	Description
commit_work_ comment	Equivalent to SQL "COMMIT COMMENT" statement.

Exceptions

Table 9-5 COMMIT_WORK Procedure Exceptions

Exception	Description
ORA-23304 (malformedcall)	Transaction was not correctly formed or terminated.

datatype_ARG Procedure

This procedure provides the data that is to be passed to a deferred remote procedure call. Depending upon the type of the data that you need to pass to a procedure, you must call one of the following procedures for each argument to the procedure.

You must specify each parameter in your procedure using the datatype_ARG procedure after you execute DBMS_DEFER.CALL. That is, you cannot use the default parameters for the deferred remote procedure call. For example, suppose you have the following procedure:

CREATE OR REPLACE PACKAGE my_pack AS
   PROCEDURE my_proc(a VARCHAR2, b VARCHAR2 DEFAULT 'SALES');
END;
/

When you run the DBMS_DEFER.CALL procedure, you must include a separate line for each parameter in the MY_PROC procedure:

CREATE OR REPLACE PROCEDURE load_def_tx IS
   node DBMS_DEFER.NODE_LIST_T;
BEGIN
   node(1) := 'MYCOMPUTER.WORLD';
   node(2) := NULL;
   DBMS_DEFER.TRANSACTION(node);
   DBMS_DEFER.CALL('SCOTT', 'MY_PACK', 'MY_PROC', 2);
   DBMS_DEFER.VARCHAR2_ARG('TEST');
   DBMS_DEFER.VARCHAR2_ARG('SALES'); -- required, cannot omit to use default
END;
/

Syntax

DBMS_DEFER.NUMBER_ARG       (arg  IN NUMBER);
DBMS_DEFER.DATE_ARG         (arg  IN DATE);
DBMS_DEFER.VARCHAR2_ARG     (arg  IN VARCHAR2);
DBMS_DEFER.CHAR_ARG         (arg  IN CHAR);
DBMS_DEFER.ROWID_ARG        (arg  IN ROWID);
DBMS_DEFER.RAW_ARG          (arg  IN RAW);
DBMS_DEFER.BLOB_ARG         (arg  IN BLOB);
DBMS_DEFER.CLOB_ARG         (arg  IN CLOB);
DBMS_DEFER.NCLOB_ARG        (arg  IN NCLOB);
DBMS_DEFER.NCHAR_ARG        (arg  IN NCHAR);
DBMS_DEFER.NVARCHAR2_ARG    (arg  IN NVARCHAR2);
DBMS_DEFER.ANY_CLOB_ARG     (arg  IN CLOB);
DBMS_DEFER.ANY_VARCHAR2_ARG (arg  IN VARCHAR2);
DBMS_DEFER.ANY_CHAR_ARG     (arg  IN CHAR);

Parameters

***Table 9-6 datatype_ARG Procedure Parameters***

Parameter	Description
arg	Value of the parameter that you want to pass to the remote procedure to which you previously deferred a call.

Exceptions

***Table 9-7 datatype_ARG Procedure Exceptions***

Exception	Description
ORA-23323	Argument value is too long.

TRANSACTION Procedure

This procedure indicates the start of a new deferred transaction. If you omit this call, then Oracle considers your first call to DBMS_DEFER.CALL to be the start of a new transaction.

Syntax

DBMS_DEFER.TRANSACTION (
   nodes  IN   node_list_t);

Note:
This procedure is overloaded. The behavior of the version without an input parameter is similar to that of the version with an input parameter, except that the former uses the nodes in the DEFDEFAULTDEST view instead of using the nodes in the nodes parameter.

Parameters

Table 9-8 TRANSACTION Procedure Parameters

Parameter	Description
nodes	A PL/SQL table of fully qualified database names to which you want to propagate the deferred calls of the transaction. The table is indexed starting at position 1 until a `NULL` entry is found, or the `NO_DATA_FOUND` exception is raised. The data in the table is case insensitive.

Exceptions

Table 9-9 TRANSACTION Procedure Exceptions

Exception	Description
ORA-23304 (malformedcall)	Previous transaction was not correctly formed or terminated.
ORA-23319	Parameter value is not appropriate.
ORA-23352	Raised by `DBMS_DEFER`.`CALL` if the node list contains duplicates.