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Connection con = null; try { con = DriverManagergetConnection(URL); Statement stmt = concreateStatement(); stmtclose(); } finally { if (con != null) conclose(); }

JDBC 20 introduces an additional form of createStatement() that takes parameters indicating where its result sets should be scrollable or not and whether they reflect concurrent changes in the underlying table The section on result sets later in this chapter describes these features in more detail

Once a statement is created, it can be used to execute commands Four methods exist for doing this: executeUpdate, executeQuery, execute, and executeBatch The choice of which method to use depends on the expected results: I executeUpdate is intended for use with the SQL INSERT, UPDATE, or DELETE statements, or with data definition statements such as CREATE TABLE It returns a count of the number of rows updated I executeQuery is used to execute an SQL SELECT statement and to return a result set I execute can be used for either purpose, but is intended for those statements that return either an update count, multiple result sets, or some combination It returns a boolean flag that indicates whether its result was an update count or a result set Additional methods are available that navigate through results I executeBatch allows multiple update statements to be executed in a batch The update counts are returned in an array The following examples illustrate each of these methods

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In this example, an erroneous product description is corrected with an SQL UPDATE statement invoked by the executeUpdate method

import javasql*; public class UpdateExample { public static void main(String[] args) throws ClassNotFoundException, SQLException { String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String URL = "jdbc:idb:" + "D:/lyricnote/WEB-INF/database/products/dbprp"; ClassforName(DRIVER); Connection con = null; try { con = DriverManagergetConnection(URL); Statement stmt = concreateStatement(); int nRows = stmtexecuteUpdate( " UPDATE products" + " SET description =" + "'Telemann: Concerto No 1 in F for Two Horns'"

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+ " WHERE itemcode = '022370'" ); Systemoutprintln(nRows + " rows updated"); stmtclose(); } finally { if (con != null) conclose(); } } }

To see that the erroneous listing was corrected, this example uses a SELECT statement to display all sheet music titles in the product catalog that are Telemann concertos:

.

JSP IN ACTION import javasql*; public class QueryExample { public static void main(String[] args) throws ClassNotFoundException, SQLException { String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String URL = "jdbc:idb:" + "D:/lyricnote/WEB-INF/database/products/dbprp"; ClassforName(DRIVER); Connection con = null; try { con = DriverManagergetConnection(URL); Statement stmt = concreateStatement(); ResultSet rs = stmtexecuteQuery( " SELECT itemcode, description" + " FROM products" + " WHERE prodtype = 'SM'" + " AND description like 'Telemann%'" + " AND description like '%Concerto%'" ); while (rsnext()) { String itemCode = rsgetString(1);

String description = rsgetString(2); Systemoutprintln(itemCode + " " + description); } rsclose(); stmtclose(); } finally { if (con != null) conclose(); } } }

When run, it produces the corrected output:

022340 022350 022360 022370 Telemann: Telemann: Telemann: Telemann: Double Viola Concerto in G Viola Concerto in G Concerto for Horn Quartet Concerto No 1 in F for Two Horns

Although the execute method can be used for either queries or updates, it s strictly necessary only for operations that may return multiple results The Statement interface provides methods for determining what has been returned and for processing the results The most common use for execute is for processing unknown SQL strings, such as in this example, which reads and processes SQL statements from a file:

import javaio*; import javasql*; public class ExecuteExample { public static void main(String[] args) throws ClassNotFoundException, SQLException, IOException { String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String URL = "jdbc:idb:" + "D:/lyricnote/WEB-INF/database/products/dbprp";

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It creates a new role as follows:

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