Bind variables (how replace the placeholders with the same value?)
Hello, I have a code like this: procedure getAllTasks(o_cursor in out PKG_APPLICATION.rc,
in_filter_project_id in T_FCT_TASK.project_id%type default -1,
in_filter_scope_id in T_FCT_TASK.scope_id%type default -1,
in_filter_user_creator_id in T_FCT_TASK.user_creator_id%type default -1,
in_filter_priority_id in T_HST_TASK.priority_id%type default -1,
in_filter_status_id in T_HST_TASK.status_id%type default -1,
in_filter_user_responsible_id in T_HST_TASK.user_responsible_id%type default -1,
in_pagination_first in integer,
in_pagination_last in integer) is
v_query varchar2(4000) := v_query_allTasks || v_query_whereFilter;
begin
PKG_APPLICATION.setPagination(v_query);
PKG_LOG.debug('query: ' || v_query, PCK);
open o_cursor for v_query
using in_filter_project_id, in_filter_scope_id, in_filter_user_creator_id, in_filter_priority_id, in_filter_status_id, in_filter_user_responsible_id, in_pagination_last, in_pagination_first;
end;
The variable v_query contains:SELECT * FROM (SELECT A.*, ROWNUM AS RNUM
FROM (
SELECT task_id, project_id, project_name, scope_id, scope_name, user_creator_id, user_creator_login, title, description,
priority_id, priority_name, status_id, status_name, user_responsible_id, user_responsible_login, due_date,
last_modified_by_id, last_modified_by_login, last_modified
FROM V_FCT_TASK
WHERE project_id = decode(:1, -1, project_id, :1)
and scope_id = decode(:2, -1, scope_id, :2)
and user_creator_id = decode(:3, -1, user_creator_id, :3)
and priority_id = decode(:4, -1, priority_id, :4)
and status_id = decode(:5, -1, status_id, :5)
and user_responsible_id = decode(:6, -1, user_responsible_id, :6)
) A
WHERE ROWNUM <= :LAST)
WHERE :FIRST <= RNUM
Note that placeholders: 1: 2,...: 5 appears 2 times in the query.Is there a more elegant way to say that *: 1 * must be replaced by in_filter_project_id, *: 2 * by in_filter_scope_id without having twice in the USING clause these variables? If this is not the case, why the placeholders have name, if you can only refer to their position (order)?
Thanks for all replies.
Hi Adam,.
text taken from http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96624/11_dynam.htm
Duplicate use of Placeholders
Placeholders in a dynamic SQL statement associated with the arguments of bind in the USING clause of position, and not by name. Thus, if the same placeholder appears two times or more in the SQL statement, each appearance must correspond to a bind argument in the USING clause. For example, if the dynamic string
sql_stmt := 'INSERT INTO payroll VALUES (:x, :x, :y, :x)';
you could code the corresponding USING clause as follows:
EXECUTE IMMEDIATE sql_stmt USING a, a, b, a;
However, only the unique placeholders in a dynamic PL/SQL block are associated with bind arguments in the USING clause of position. Thus, if the same placeholder appears two times or more in a PL/SQL block, all appearances correspond to a single argument to bind in the USING clause. In the example below, the first unique placeholder (x) is associated with the first bind argument (one). Similarly, the second unique space reserved (y) is associated with the second argument to bind (b).
DECLARE
a NUMBER := 4;
b NUMBER := 7;
BEGIN
plsql_block := 'BEGIN calc_stats(:x, :x, :y, :x); END;'
EXECUTE IMMEDIATE plsql_block USING a, b;
...
END;
Hope this helps
Christian Balz
Tags: Database
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