Use this procedure to create a collection from a supplied query using bulk operations. This method offers significantly faster performance than the CREATE_COLLECTION_FROM_QUERY method. The query is parsed as the application owner. If a collection exists with the same name for the current user in the same session for the current Application ID, an application error is raised.
This procedure uses bulk dynamic SQL to perform the fetch and insert operations into the named collection. Two limitations are imposed by this procedure:
The MD5 checksum for the member data is not computed.
No column value in query p_query can exceed 2,000 bytes. If a row is encountered that has a column value of more than 2,000 bytes, an error is raised during execution. In Oracle Database 11g Release 2 (11.2.0.1) or later, this column limit is 4,000 bytes.
Syntax
APEX_COLLECTION.CREATE_COLLECTION_FROM_QUERY_B ( p_collection_name IN VARCHAR2, p_query IN VARCHAR2, p_max_row_count IN NUMBER DEFAULT null);
Parameters
Table 6-12 CREATE_COLLECTION_FROM_QUERY_B Procedure (No bind version) Parameters
| Parameter | Description |
|---|---|
|
|
The name of the collection. The maximum length is 255 characters. An error is returned if this collection exists with the specified name of the current user and in the same session. |
|
|
Query to execute to populate the members of the collection. If p_query is numeric, it is assumed to be a DBMS_SQL cursor. |
|
|
Maximum number of rows returned from the query in p_query which should be added to the collection. |
Example
The following example shows how to use the CREATE_COLLECTION_FROM_QUERY_B procedure to create a collection named EMPLOYEES and populate it with data from the emp table.
declare
l_query varchar2(4000);
Begin
l_query := 'select empno, ename, job, sal from emp';
APEX_COLLECTION.CREATE_COLLECTION_FROM_QUERY_B
(
p_collection_name => 'EMPLOYEES',
p_query => l_query );
End;