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5.12 PLVfk: Foreign Key Interface

The PLVfk (PL/Vision Foreign Key) package is a high-level, easy-to-use interface to look up foreign key information in your tables. See Chapter 19 for details.

5.12.1 Package Constants

c_prefix CONSTANT VARCHAR2(1) := 'P';

Specifies that the column abbreviation is to be used as a prefix.

c_suffix CONSTANT VARCHAR2(1) := 'S';

Specifies that the column abbreviation is to be used as a suffix.

c_no_change CONSTANT VARCHAR2(10) := 'NO CHANGE';

Used to indicate that no change is to be made to the string value.

c_int_no_change CONSTANT INTEGER := 0;

Used to indicate that no change is to be made to the INTEGER value.

5.12.2 Setting the PLVfk configuration

PROCEDURE set_vclen (length_in IN INTEGER);

Sets the default VARCHAR2 length for the foreign key named retrieved by the PLVfk.name function.

PROCEDURE set_id_default
(string_in IN VARCHAR2 := c_no_change,
type_in IN VARCHAR2 := c_no_change);

Sets the default value to be used as the suffix or prefix of the name for the ID column.

PROCEDURE set_nm_default
(string_in IN VARCHAR2 := c_no_change,
type_in IN VARCHAR2 := c_no_change);

Sets the default value to be used as the suffix or prefix of the name for the name column.

5.12.3 Looking up the name

FUNCTION name
   (fk_id_in IN INTEGER,
    fk_table_in IN VARCHAR2, 
    fk_id_col_in IN VARCHAR2 := c_no_change, 
    fk_nm_col_in IN VARCHAR2 := c_no_change, 
    max_length_in IN INTEGER := c_int_no_change, 
    where_clause_in IN VARCHAR2 := NULL)
RETURN VARCHAR2;

Retrieves the name for the specified table and ID.

5.12.4 Looking up the ID

FUNCTION id
   (fk_nm_in IN VARCHAR2,
    fk_table_in IN VARCHAR2, 
    fk_id_col_in IN VARCHAR2 := c_no_change, 
    fk_nm_col_in IN VARCHAR2 := c_no_change, 
    max_length_in IN INTEGER := c_int_no_change, 
    where_clause_in IN VARCHAR2 := NULL)
RETURN INTEGER;

Retrieves the ID (primary key) for the specified table and name or descriptor.


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