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CHAPTER 5 STATEMENT AND PREPAREDSTATEMENT
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The following method, _demoExecute(), takes a connection object and a SQL statement and executes the statement using the execute() method of the Statement interface. It can be invoked for a query statement as well as a nonquery DML statement, such as an insert, as illustrated in the main() program: // demonstrate the execute() method of the Statement interface private static void _demoExecute( Connection conn, String sqlStmt ) throws SQLException { ResultSet rset = null; Statement stmt = null; try { stmt = conn.createStatement(); // execute the query After creating the statement, we execute it and get the boolean value that tells us if the statement was a query or a not. boolean isQuery = stmt.execute( sqlStmt ); If it is a query, we get the ResultSet and print the results. In this example, we have to know the column type and position (or name) of the query to retrieve the results. Notice how we use the column names (instead of column s positional index) to get the results this time. // if it is a query, get the result set and print the results if( isQuery ) { rset = stmt.getResultSet(); while (rset.next()) { int empNo = rset.getInt ( "empno" ); String empName = rset.getString ( "ename" ); System.out.println( empNo + "," + empName ); } } If it is not a query, we assume it is an insert, update, or delete and get the number of rows affected using the getUpdateCount() method. We also close the statement and result set at the end of the method: else { // we assume it is an insert, update, or delete statement int numOfRowsAffected = stmt.getUpdateCount(); System.out.println( "Number of rows affected by execute() = " + numOfRowsAffected ); } } finally
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{ JDBCUtil.close( rset ); JDBCUtil.close( stmt ); } } As mentioned earlier, we can also use the execute() method to execute a stored procedure, although we cannot use bind values, and we cannot retrieve any values returned by the stored procedure. The method _demoInvokingSQLProcedure at the end of the program DemoStatement illustrates this: private static void _demoInvokingSQLProcedure( Connection conn ) throws SQLException { Statement stmt = null; try { stmt = conn.createStatement(); // execute the sql procedure boolean ignore = stmt.execute( "begin p2( 3 ); end;" ); } finally { JDBCUtil.close( stmt ); } } } // end of program We use the Oracle style anonymous block enclosed in the begin/end block to invoke the procedure. We will look at another style, called SQL92, in 6. Now that you ve learned about the Statement interface, let s look at why it isn t a good idea to use it in your code. The basic problem with the Statement interface is that it accepts only literal parameters. In the preceding example, the value of employee number would be hard-coded into the query each time, and every variation of the query even though it may vary only by the value of supplied employee number would be treated as a brand-new query by Oracle and would be hard-parsed. For example, the query select ename from emp where empno = 1234 is treated as distinct from the query select ename from emp where empno = 4321, whereas both queries are the same except for the user input of the employee number. As already discussed, this is something to avoid. When we use a PreparedStatement object, we replace the literal value with a placeholder ( in JDBC) in other words, a bind variable so that Oracle will treat it as the same statement each time. The actual values (1234 and 4321 in the example) are bound to the query at runtime. In this case, Oracle performs a hard parse the first time it encounters the statement, and it performs much less expensive soft parses subsequently. If you want to see proof of how much difference this can make in terms of performance, I refer you to the example in the Bind Variables Example section of the 2, which showed the vast decrease in execution time and resource uses obtained when inserting 10,000 records in a table with bind variables rather than without.
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