18.22 TEXT_FROM_LOV_QUERY Function

Use this function to display an item as text, deriving the display value from a list of values query.

Syntax

APEX_ITEM.TEXT_FROM_LOV_QUERY (
    p_value       IN    VARCHAR2 DEFAULT NULL,
    p_query       IN    VARCHAR2,
    p_null_text   IN    VARCHAR2 DEFAULT '%')
    RETURN VARCHAR2;

Parameters

Table 18-22 TEXT_FROM_LOV_QUERY Parameters

Parameter Description

Parameter	Description
`p_value`	Value of a field item.
`p_query`	SQL query that is expected to select two columns, a display column and a return column. For example: SELECT dname, deptno FROM dept Note if only one column is specified in the select clause of this query, the value for this column is used for both display and return purposes.
`p_null_text`	Value to be displayed when the value of the field item is NULL or a corresponding entry is not located for the value `p_value` in the list of values query.

p_value

Value of a field item.

p_query

SQL query that is expected to select two columns, a display column and a return column. For example:

SELECT dname, deptno FROM dept

Note if only one column is specified in the select clause of this query, the value for this column is used for both display and return purposes.

p_null_text

Value to be displayed when the value of the field item is NULL or a corresponding entry is not located for the value p_value in the list of values query.

Example

The following example demonstrates how to derive the display value from a query.

SELECT APEX_ITEM.TEXT_FROM_LOV_QUERY(empno,'SELECT ename, empno FROM emp') c from emp

Parent topic: APEX_ITEM