如何将 BLOB 值作为 DBMS 作业参数传递？

Question

使用DBMS_SCHEDULER.SET_JOB_ANYDATA_VALUE 并传递封装在ANYDATA 值中的BLOB 时，分配失败并出现错误：

ORA-22370: incorrect usage of method 
ORA-06512: at "SYS.DBMS_ISCHED", line 278
ORA-06512: at "SYS.DBMS_SCHEDULER", line 880
ORA-06512: at line 9
22370. 00000 -  "incorrect usage of method %s"
*Cause:    This method of SYS.AnyType or SYS.AnyData or SYS.AnyDataSet is
           being used inappropriately.
*Action:   Check the documentation for correct usage.

如果我通过封装在ANYDATA 中的VARCHAR2 它可以工作，但BLOB 不工作。这是一个例子：

PL/SQL 过程

CREATE OR REPLACE PROCEDURE BLOB_TEST (
    p_blob  BLOB
) AS
BEGIN
    COMMIT;
END;
/

DBMS 程序

BEGIN
    DBMS_SCHEDULER.CREATE_PROGRAM (
        program_name        => 'prog_blob_test',
        program_type        => 'STORED_PROCEDURE',
        program_action      => 'BLOB_TEST',
        number_of_arguments => 1,
        enabled             => FALSE
    );

    DBMS_SCHEDULER.DEFINE_ANYDATA_ARGUMENT (
        program_name        => 'prog_blob_test',
        argument_name       => 'p_blob',
        argument_position   => 1,
        argument_type       => 'BLOB',
        default_value       => NULL
    );

    DBMS_SCHEDULER.ENABLE (name => 'prog_blob_test');
END;
/

DBMS 作业

DECLARE
    l_blob  BLOB    := UTL_RAW.cast_to_raw('This is some BLOB data');
BEGIN
    DBMS_SCHEDULER.CREATE_JOB (
        job_name        => 'job_blob_test',
        program_name    => 'prog_blob_test'
    );

    DBMS_SCHEDULER.SET_JOB_ANYDATA_VALUE (
        job_name        => 'job_blob_test',
        argument_name   => 'p_blob',
        argument_value  => SYS.ANYDATA.ConvertBlob(l_blob) -- DON'T WORK
        -- argument_value  => SYS.ANYDATA.convertvarchar2('test') -- WORKS!
    );

    -- DBMS_SCHEDULER.ENABLE (name => 'job_blob_test');
END;
/

Answer 1

尝试简单地使用 DEFINE_PROGRAM_ARGUMENT 而不是 SET_JOB_ANYDATA_VALUE：

    declare
      l_blob  BLOB    := UTL_RAW.cast_to_raw('This is some BLOB data');      
    begin
        dbms_scheduler.CREATE_PROGRAM
        (
            program_name        => 'prog_blob_test',
            program_action      => 'BLOB_TEST',
            program_type        => 'STORED_PROCEDURE',
            number_of_arguments => 1,
            enabled             => FALSE
        ) ;

        dbms_scheduler.DEFINE_PROGRAM_ARGUMENT
        (
            program_name        => 'prog_blob_test',
            argument_position   => 1,
            argument_type       => 'BLOB',
            default_value       => l_blob
        );

        DBMS_SCHEDULER.ENABLE(name => 'prog_blob_test');
    end;
    /

这应该适用于任何 SQL 数据类型。