函数在PL / SQL中返回游标 - 在Java端或PL / SQL端关闭它？

Question

I am calling a stored function in PL/SQL using Java that returns a REF CURSOR :

FUNCTION getApprovers RETURN approvers_cursor IS
    approvers approvers_cursor;
BEGIN
    OPEN approvers FOR
        select * from role where role_name = 'APPROVER';
    RETURN approvers;
END;

If I close the cursor before the RETURN approvers

CLOSE approvers;
RETURN approvers;

I get a warning in Java - Cursor is Closed .

It seems that I cannot close the cursor in the PL/SQL stored function. Where then does the closing of the cursor take place?

Answer 1

As a matter of fact, ResultSet s are Cursors.

 //JAVA                            //PL/SQL
 PreparedStatement ps = con.prepareStatement(
            "select * from role where role_name = ?");
 ps.setString(1, "APPROVER");
 ResultSet rs = ps.executeQuery(); //OPENS the cursor
 while(rs.next()) {                //FETCHES next row from cursor
    //Handle resultset
 }
 rs.close();                       //CLOSES the cursor

Of cause since Java 7 you could do this with try-with-resource and hide the close() calls - but for clarity of what equals what written old-style here