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CHAPTER 7 RESULT SETS EXPLORED
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You can and always should verify the actual result set type and concurrency type by using the following two methods in the ResultSet interface (both throw a SQLException): int getType(): This method returns an int value for the result set type used for the query. int getConcurrency(): This method returns an int value for the concurrency type used for the query.
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Note According to the documentation, in case of a downgrade, the driver should issue a SQLWarning
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on the statement object with information on the reason the downgrade occurred. However, this did not work during my tests. A simple workaround is to always check the type and concurrency type at the ResultSet level.
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An easy way to find out if your result set can be scroll-sensitive or updatable is to run the same query in SQL*Plus but add the pseudo column rowid to the query s list of columns (the rowid pseudo column returns the address of the row in Oracle). If the query works, then most likely the request for a scrollable result set would succeed without a downgrade. For example, if we add the pseudo column rowid to the query select ename from emp, it works as follows: scott@ORA10G> select rowid, ename from emp; ROWID ENAME ------------------ ---------AAAL+ZAAEAAAAAdAAA SMITH <trimmed for saving space> 14 rows selected. But if we add the pseudo column rowid to the query select e.ename, d.deptno from emp e, dept d where e.deptno = d.deptno, it does not work: scott@ORA10G> select rowid, e.ename, d.deptno from emp e, dept d where e.deptno = d.deptno; select rowid, e.ename, d.deptno from emp e, dept d where e.deptno = d.deptno * ERROR at line 1: ORA-00918: column ambiguously defined Thus, the second query will go through a downgrade based on the rules stated earlier. The reason the preceding test works is that the JDBC driver silently (and blindly) adds a rowid pseudo column to the list of columns for such queries and uses the selected rowids to perform various operations, such as updates on result sets, as you will see later.
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CHAPTER 7 RESULT SETS EXPLORED
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Note The fact that the JDBC driver silently (and blindly) adds a rowid pseudo column to the list of
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columns for such queries and uses the selected rowids to perform various operations also explains why select * from emp does not work but select e.* from emp does.
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Positioning in a Scrollable Result Set
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As mentioned earlier, scrollable result sets (scroll-sensitive and scroll-insensitive) allow you to iterate through the result set either forward or backward, and to modify the current position in the result set to any desired row number using a relative or an absolute row number. This section covers some of these methods.
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Methods to Move Within a Result Set
The following methods allow you to move to a new position in a scrollable result set (all of them throw a SQLException, although I don t show that specifically). The word cursor here refers to the current row position in the result set. void beforeFirst(): This method moves the cursor to a position before the first row of the result set, and it has no effect if there are no rows in the result set. This is the default initial position for any kind of result set. Note that after invoking this method, there is no valid current row, so you cannot position relatively from this point. void afterLast(): This method moves the cursor to a position after the last row of the result set, and it has no effect if there are no rows in the result set. You can use this method to position the current row of the result set after the final row to start processing the rows backward. Note that after invoking this method, you are outside the result set bounds. Thus, there is no valid current row, so you cannot position relatively from this point. Another implication of invoking this method is that Oracle has to read all the rows of the result set to reach the last row; it has performance implications that we will look at shortly. boolean first(): This method moves the cursor to the first row of the result set or returns false if there are no rows in the result set. boolean last(): This method moves the cursor to the last row of the result set or returns false if there are no rows in the result set. boolean absolute(int row): This method moves the cursor to an absolute row from either the beginning or the end of the result set. If you input a positive number, it positions from the beginning; if you input a negative number, it positions from the end. This method returns false if there are no rows in the result set.
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