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Parameters allow you to pass values into (IN), pass values out of (OUT), or pass values into and out of (IN OUT) a cursor, function, or procedure. (Cursors are covered in 5.) You ve already seen parameters used in earlier code listings. I m covering parameters here because they use declaration syntax similar to variables, and they themselves are variables.
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Parameters follow the same PL/SQL identifier naming rules as variables. In practice, however, I like to use a couple of additional prefix characters on parameter names so I can also tell their scope, along with the data type. Table 3-3 is a list of those parameter prefix values.
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Table 3-3. My PL/SQL Parameter Naming Prefixes
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Argument IN Argument OUT Argument IN OUT
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For example, if I were to declare parameters to pass data from the columns in the AUTHOR table into and/or out of a method, I would use the identifier names in Table 3-4.
Table 3-4. Parameter Name Examples Using My Prefixing Scheme
Scope IN
ain_id aiv_name aid_birth_date aiv_gender
aon_id aov_name aod_birth_date aov_gender
IN OUT
aion_id aiov_name aiod_birth_date aiov_gender
The advantage of using these prefixes is that you ll always know the scope and data type of the parameter with which you re working.
Parameter Declarations
Listings 3-9 and 3-10 create a package named PARAMETERS, which I ll use to explain the parameter declaration syntax and parameter scope. Listing 3-9. A Package Spec to Test Parameter Scope, parameters.pks 01 02 03 04 05 06 create or replace package PARAMETERS as /* parameters.pks by Donald J. Bales on 12/15/2006 A package to test parameter scope */
CH A PT ER 3 NO W W H ERE D I D I P UT TH AT
07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
-- A function that exercises the scope of parameters FUNCTION in_out_inout( aiv_in in varchar2, aov_out out varchar2, aiov_inout in out varchar2) return varchar2;
-- A procedure that exercises the scope of parameters PROCEDURE in_out_inout( aiv_in in varchar2, aov_out out varchar2, aiov_inout in out varchar2);
end PARAMETERS; / @se.sql PARAMETERS
The syntax used to declare the parameters in the function and procedure in Listing 3-9 is as follows: ( <parameter_name_1> <parameter_name_2> <parameter_name_N>
[IN][OUT] <data_type_1>, [IN][OUT] <data_type_2>,... [IN][OUT] <data_type_N>)
where <parameter_name> is the name of the parameter, the scope is IN, OUT, or IN OUT, and <data_type> is the data type of the parameter. As you have already seen in previous listings, you can use column or row anchors to specify the data type (you know %TYPE or %ROWTYPE). However, the value of the parameter will not be constrained by the specified size in the anchor. Only the data type is used from the anchor.
Parameter Scope
The parameter keywords IN and OUT determine the accessibility, or scope, of the parameters: IN makes your parameters data available to the called cursor, function, or procedure. OUT allows the called function or procedure to set the parameter s value within the called PL/SQL block. The combination of IN and OUT allows both levels of accessibility. Seeing is believing, so take some time to study Listings 3-10 and 3-11, and the output of Listing 3-11.
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Listing 3-10. A Package Body to Test Parameter Scope, parameters.pkb 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 create or replace package body PARAMETERS as /* parameters.pkb by Donald J. Bales on 12/15/2006 A package to test parameter scope */ FUNCTION in_out_inout( aiv_in in varchar2, aov_out out varchar2, aiov_inout in out varchar2) return varchar2 is begin pl(chr(9)||'Before assignments...'); pl(chr(9)||'Inside function in_out_inout, aiv_in = '||aiv_in); pl(chr(9)||'Inside function in_out_inout, aov_out = '||aov_out); pl(chr(9)||'Inside function in_out_inout, aiov_inout = '||aiov_inout); -- You can only assign a value (write) to an OUT -- parameter, you can't read it! aov_out := 'OUT'; -- You can only read an IN parameter aiov_inout := aiv_in; -- You can read and write an IN OUT parameter aiov_inout := aiov_inout||'OUT'; pl(chr(9)||'After assignments...'); pl(chr(9)||'Inside function in_out_inout, aiv_in = '||aiv_in); pl(chr(9)||'Inside function in_out_inout, aov_out = '||aov_out); pl(chr(9)||'Inside function in_out_inout, aiov_inout = '||aiov_inout); return 'OK'; -- a function must return a value! end in_out_inout;
PROCEDURE in_out_inout( aiv_in in varchar2, aov_out out varchar2, aiov_inout in out varchar2) is begin pl(chr(9)||'Before assignments...'); pl(chr(9)||'Inside procedure in_out_inout, aiv_in = '||aiv_in); pl(chr(9)||'Inside procedure in_out_inout, aov_out = '||aov_out); pl(chr(9)||'Inside procedure in_out_inout, aiov_inout = '||aiov_inout); -- You can only assign a value (write) to an OUT -- parameter, you can't read it!
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