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Caution As you may have already guessed, using the Statement interface for executing stored procedures is not a good idea. You should use CallableStatement, as explained in the next chapter, for this purpose because it allows you to pass parameters as bind variables and it also allows you to retrieve values returned by a stored procedure.
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The following DemoStatement class illustrates the methods in the Statement interface. We first look at the main() method after importing the requisite classes: /* This program demonstrates how to use the Statement interface * to query and modify data and execute stored procedures. * Note that you should not use the Statement class for executing * SQL in your production code since it does not allow you to * use bind variables. You should use either the PreparedStatement * or the CallableStatement class. * COMPATIBLITY NOTE: runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.ResultSet; import java.sql.Date; import java.sql.SQLException; import java.sql.Statement; import java.sql.Connection; import book.util.JDBCUtil; public class DemoStatement { public static void main(String args[]) { Connection conn = null; try { conn = JDBCUtil.getConnection("scott", "tiger", args[0]); _demoQuery( conn ); _demoInsert( conn ); _demoExecute( conn, "select empno, ename from emp where job = 'CLERK'" ); _demoExecute( conn, "insert into t1( x) values( 2 ) " ); _demoInvokingSQLProcedure( conn ); conn.commit(); } catch (SQLException e) { // handle the exception - in this case, we // roll back the transaction and // print an error message and stack trace. JDBCUtil.printExceptionAndRollback ( conn, e ); } finally
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{ // release resources associated with JDBC // in the finally clause. JDBCUtil.close( conn ); } } // end of main In the main() method, we get the connection as SCOTT, using the JDBCUtil.getConnection() method as explained in 3. We invoke the following methods, which I explain shortly: _demoQuery: Demonstrates executing a query using the Statement interface _demoInsert: Demonstrates executing an insert using the Statement interface _demoExecute: Demonstrates executing any DML (a query or an insert, update, etc.) using the Statement interface _demoInvokingSQLProcedure: Demonstrates invoking a SQL procedure without using bind variables and without being able to retrieve values back from the stored procedure Let s look at each of these methods in detail now, starting with the first half of _demoQuery(): // execute a query using the Statement interface private static void _demoQuery( Connection conn ) throws SQLException { ResultSet rset = null; Statement stmt = null; try { Inside the try catch block, we first create the statement: stmt = conn.createStatement(); Next, we use the executeQuery() method on the Statement object, passing the select statement that we want to execute. The invocation returns query results in the form of a ResultSet object. // execute the query rset = stmt.executeQuery( "select empno, ename, hiredate from emp where job = 'CLERK'" ); As explained in 3, a ResultSet object maintains a cursor pointing to its current row of data. Initially, the cursor is positioned before the first row. We use the next() method to move the cursor to the next row, thus iterating through the result set as shown in the following code. The next() method returns false when there are no more rows in the ResultSet object, at which point we exit the loop. Within the loop, we retrieve each column value of a row using the appropriate getXXX() method of the ResultSet interface. This means using getInt() with the integer column empno, getString() with the string column ename, and getDate() with the
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date column hiredate. The first parameter of these methods is the positional index of the column in the select clause in the query (the index starts from 1). // loop through the result set and print while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); Date hireDate = rset.getDate ( 3 ); System.out.println( empNo + "," + empName + "," + hireDate ); } We end the try catch block with a finally clause in which we close the result set and the statement objects. Putting these objects in the finally clause ensures that they always get called (e.g., even in the case of an exception); otherwise, the database can run out of cursor resources. } finally { JDBCUtil.close( rset ); JDBCUtil.close( stmt ); } } The next method, _demoInsert(), illustrates how to insert data using the executeUpdate() method of the Statement interface: // demonstrate inserting record using the Statement interface private static void _demoInsert( Connection conn ) throws SQLException { Statement stmt = null; try { stmt = conn.createStatement(); // execute the insert int numOfRowsInserted = stmt.executeUpdate( "insert into t1( x) values( 1 ) " ); System.out.println( "Number of rows inserted = " + numOfRowsInserted ); } finally { JDBCUtil.close( stmt ); } } As you can see, most of the code is similar to the method _demoQuery() shown earlier. The only difference is that this time we use the executeUpdate() method to insert a row in the table t1 and print the number of rows inserted successfully as returned by executeUpdate(). The same technique can also be used to update and delete rows from a table.
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