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Just as you can use the TYPE keyword to declare a new PL/SQL table, you can also use it to declare a PL/SQL record. Listing 3-7 is an example of doing just that. Listing 3-7. Declaring a PL/SQL Record, record.sql 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 rem rem rem rem record.sql by Don Bales on 12/15/2006 An anonymous PL/SQL procedure to demonstrate the use of PL/SQL records
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declare TYPE name_record is record ( first_name middle_name last_name
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WORKER_T.first_name%TYPE, WORKER_T.middle_name%TYPE, WORKER_T.last_name%TYPE );
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TYPE name_table is table of name_record index by binary_integer; t_name begin t_name(1).first_name t_name(1).last_name t_name(2).first_name t_name(2).last_name name_table;
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'JOHN'; 'DOE'; 'JANE'; 'DOE';
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pl(t_name(1).last_name||', '||t_name(1).first_name); pl(t_name(2).last_name||', '||t_name(2).first_name); end; /
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CHAPTER 3 NOW WHERE DID I PUT THAT
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The syntax used in Listing 3-7 to declare a PL/SQL record is as follows: TYPE <plsql_record_type_name> IS RECORD ( <field_name_1> <data_type_1>, <field_name_2> <data_type_2>,... <field_name_N> <data_type_N>); where <plsql_record_type_name> is the name for the new PL/SQL record type, <field_name> is the name of a field in the record, and <data_type> is the data type for the corresponding field. As with the program in Listing 3-6, on lines 19 through 25 in Listing 3-7, I use the dot operator (.) followed by the name of the field in the record to address the composite data type values in the PL/SQL table.
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WHAT S WITH THIS NOMENCLATURE INCONSISTENCY ANYWAY
I like things, especially programming code, to be consistent. Consistency makes things obvious. Obvious makes program code easy to maintain. Along those lines, I would feel much better if Oracle had called the syntax for creating a composite data type in a PL/SQL block a row instead of a record. Then we could refer to a field as column. The syntax would then be as follows: TYPE <plsql_row_type_name> IS ROW ( <column_name_1> <column_name_2> <column_name_N>
<data_type_1>, <data_type_2>,... <data_type_N>);
OK, now I feel better. I just needed to share how much that irritates me!
Single Dimension My Foot!
Earlier, I said that associative arrays will support only a single dimension. In other words, you can t declare a multidimensional array and address it like this: t_name(1, 7).name. Well, there s a way around that limitation. Every good problem deserves a good hack. Listing 3-8 demonstrates how to use a PL/SQL table inside a PL/SQL record in order to work around the one-dimension limit. Listing 3-8. A Hack to Work Around the PL/SQL Table One-Dimension Limit, multidimensional.sql 01 02 03 04 05 06 07 08 rem rem rem rem multidimensional.sql Copyright by Don Bales on 12/15/2006 An anonymous PL/SQL procedure to demonstrate the use of nested PL/SQL tables
declare TYPE name_table is table of WORKER_T.name%TYPE
CH A PT ER 3 NO W W H ERE D I D I P UT TH AT
09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
index by binary_integer; TYPE name_record is record ( dim2 name_table ); TYPE dim1 is table of name_record index by binary_integer; t_dim1 begin t_dim1(1).dim2(1) := 'DOE, JOHN'; t_dim1(1).dim2(2) := 'DOE, JANE'; t_dim1(2).dim2(1) := 'DOUGH, JAYNE'; t_dim1(2).dim2(2) := 'DOUGH, JON'; pl(t_dim1(1).dim2(1)); pl(t_dim1(1).dim2(2)); pl(t_dim1(2).dim2(1)); pl(t_dim1(2).dim2(2)); end; / Here s how Listing 3-8 works: Lines 8 and 9 declare a table type, name_table, to hold a list of names. Lines 11 and 12 declare a record type, name_record, with one field named dim2, where the data type is name_table, a PL/SQL table. Lines 14 and 15 declare a second table type, dim1, which is based on record type dim2. On lines 20 through 29, with the pseudo-two-dimension table in place, I exercise accessing it using two indexes. dim1;
As I said, single dimension my foot! Since the use of arrays is a rather advanced topic, I m going to skip the exercise here. Next, we ll look at the most temporary of variables, which aren t really variables at all: parameters.
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