CREATE_COLLECTION_FROM_QUERY

9.32 CREATE_COLLECTION_FROM_QUERY_B Procedure

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_names  IN apex_application_global.vc_arr2,
    p_values IN apex_application_global.vc_arr2,
    p_max_row_count      IN NUMBER default null,
    p_truncate_if_exists IN VARCHAR2 default 'NO');

Parameters

Table 9-11 CREATE_COLLECTION_FROM_QUERY_B Procedure Parameters

Parameter	Description
`p_collection_name`	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.
`p_query`	Query to execute to populate the members of the collection.
`p_names`	Array of bind variable names used in the query statement.
`p_values`	Array of bind variable values used in the bind variables in the query statement.
`p_max_row_count`	Maximum number of rows returned from the query in p_query which should be added to the collection.
`p_truncate_if_exists`	If `YES`, then members of the collection will first be truncated if the collection exists and no error will be raised. If `NO` (or not `YES`), and the collection exists, an error will be raised.

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 where deptno = :b1';
     APEX_COLLECTION.CREATE_COLLECTION_FROM_QUERY_B (
         p_collection_name => 'EMPLOYEES',
         p_query => l_query,
         p_names => apex_util.string_to_table('b1'),
         p_values => apex_util.string_to_table('10'));
 End;