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_2 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. It is identical to the
CREATE_COLLECTION_FROM_QUERY_B, however, the first five columns of the
SELECT clause must be numeric and the next five columns must be date. After the date columns, there can be up to 50 character columns in the
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 (188.8.131.52) or later, this column limit is 4,000 bytes.
APEX_COLLECTION.CREATE_COLLECTION_FROM_QUERYB2 ( p_collection_name IN VARCHAR2, p_query IN VARCHAR2. p_max_row_count IN NUMBER DEFAULT);
Table 5-14 CREATE_COLLECTION_FROM_QUERYB2 Procedure (No bind version) Parameters
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.
The following example shows how to use the
CREATE_COLLECTION_FROM_QUERYB2 procedure to create a collection named
EMPLOYEES and populate it with data from the
EMP table. The first five columns (mgr, sal, comm, deptno, and null) are all numeric and the next five are all date. Because p_generate_md5 is '
MD5 checksum is not computed.
declare l_query varchar2(4000); Begin l_query := 'select empno, sal, comm, deptno, null, hiredate, null, null, null, null, ename, job, mgr from emp where deptno = 10'; APEX_COLLECTION.CREATE_COLLECTION_FROM_QUERYB2 ( p_collection_name => 'EMPLOYEES', p_query => l_query, End;