Not able to use dynamic SQL in bulk collect and forall - plsql

Question

Hi friends am writing a stored procedure that selects and inserts data from one table to another table in the same database but different users, to speed up the insert am trying to use bulk collect and forall but the problem is am using dynamic SQL in the procedure that picks table name, it's corresponding primary key name and the date validation columns from another status table
For eg: consider the following query
Select empid from emp_tab where trunc(insert_time)=trunc(sysdate)
Here the PRIMARY KEY - empid, TABLENAME- emp_tab, date validation column - insert_time will be dynamically picked by the procedure during run time of the procedure from another status table but am not able incorporate the bulk collect and forall into dynamic SQL for bulk collect am getting
inconsistent data type
error and forall am getting
virtual column
error
Does bulk and forall supports dynamic sql????
If not then is there any other way to speed up the insert like forall
Any suggestions are welcome
Thanks in advance

Answer 1

Yes, they do. Despite BULK COLLECT being a powerful tool, it can be tricky with all its limitation. Here is a example using REF CURSOR, but you can build the TYPES according to your necessity.
-- create source data
CREATE TABLE temp_table_source AS
(SELECT ROWNUM id,
dbms_random.String('U', 10) name,
Round(dbms_random.Value(1, 7000)) salary
FROM dual
CONNECT BY LEVEL <= 5000 -- number of rows for the test
);
-- create destination table (empty)
CREATE TABLE temp_table_dest AS
SELECT * FROM temp_table_source WHERE 1 = 2;
-- Dynamic bulk anonymous block
DECLARE
v_stmt VARCHAR2(100);
v_insert VARCHAR2(100);
TYPE rec_source IS RECORD ( -- a type to represent your data
id temp_table_source.id%TYPE,
name temp_table_source.name%TYPE,
salary temp_table_source.salary%TYPE
);
TYPE t_source IS TABLE OF rec_source;
m_source t_source;
TYPE l_cursor_type IS REF CURSOR;
l_cursor l_cursor_type;
BEGIN
v_stmt := 'SELECT * FROM temp_table_source where 1 = :x';
v_insert := 'INSERT INTO temp_table_dest (id, name, salary) VALUES (:a, :b, :c)';
OPEN l_cursor FOR v_stmt USING 1; -- example of filtering
LOOP -- use limits to test performance, but the LOOP is optional
FETCH l_cursor BULK COLLECT INTO m_source LIMIT 1000;
--
FORALL i IN 1 .. m_source.COUNT
EXECUTE IMMEDIATE v_insert
USING m_source(i).id, m_source(i).name, m_source(i).salary;
--
COMMIT;
EXIT WHEN m_source.COUNT = 0;
END LOOP;
END;
/
-- See the result
Select count(1) from temp_table_dest;
If you need a dynamic TYPE as well, you will need to create it and drop at the end of your procedure instead of declare it in your package.