Invalid table name when pass in the table name as variable in dynamic sql

Question

Hi,
I need to create a stored procedure which will return a list of data to my java application like the following.
first, select the table name from the first table.
For example : SELECT T_NAME FROM MDR_SMSTABLES
second, select the data from the table which returned by first select statement
For example : SELECT * FROM T_NAME.
I use dynamic sql with cursor to select the data. But it returns "java.sql.SQLException: ORA-00903: invalid table name"
I fetch the table name to varchar2. I think this might the cause it returns me the this error. But i don't know what type should i put for the table name other then varchar2.
val2 VARCHAR2(200);
OPEN cv FOR
SELECT T_NAME FROM MDR_SMSTABLES WHERE T_DATE=d_dt_sent;
FETCH cv INTO val2;
WHILE cv%FOUND
LOOP
OPEN refcur FOR
'SELECT * FROM :t WHERE MID = :m' USING val2, msg_id;
EXIT WHEN refcur IS NOT NULL;
FETCH cv INTO val2;
END LOOP;
As my stored procedure is quite long, so i just paste some of the code here. Hope the information is enough. Can anyone please help?
Thanks

Answer 1

DECLARE
val2 VARCHAR2 (200);
cv sys_refcursor;
refcur sys_refcursor;
BEGIN
OPEN cv FOR
SELECT table_name
FROM user_tables
WHERE table_name IN ('EMP', 'DEPT');
FETCH cv INTO val2;
WHILE cv%FOUND
LOOP
OPEN refcur FOR 'SELECT * FROM '||val2;
EXIT WHEN refcur IS NOT NULL;
FETCH cv INTO val2;
END LOOP;
END;