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The Demo_Statement_GetObjectValues_Oracle class retrieves OBJECT values. Note that Oracle s JDBC implementation maps NUMBER types to the java.math.BigDecimal objects. import java.util.*; import java.io.*; import java.sql.*; import jcb.db.*; import jcb.meta.*; public class Demo_Statement_GetObjectValues_Oracle { public static Connection getConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@localhost:1521:caspian"; String username = "mp"; String password = "mp2"; Class.forName(driver); // load Oracle driver return DriverManager.getConnection(url, username, password); } public static void main(String[] args) { Connection conn = null; Statement stmt = null; ResultSet rs = null; try { System.out.println("--Demo_Statement_GetObjectValues_Oracle begin--"); conn = getConnection(); System.out.println("conn="+conn); System.out.println("---------------"); // create Statement object stmt = conn.createStatement(); // Select rows from the employee table // note that emp is an EMPLOYEE_TYPE object rs = stmt.executeQuery("SELECT emp, age FROM employee"); // Get the OBJECT values from each row while (rs.next()) { // Handle the first column: // Get the EMPLOYEE_TYPE value from the first column emp oracle.sql.STRUCT emp = (oracle.sql.STRUCT) rs.getObject(1); // Get the emp values from each row Object[] empValues = emp.getAttributes(); // Get the values of emp String name = (String) empValues[0]; java.math.BigDecimal badgeNumber = (java.math.BigDecimal) empValues[1]; // Handle the second column: // Get the age from the second column employee of the row int age = rs.getInt(2);

The order of elements in an array of update counts corresponds to the order in which commands were added to the batch DataTruncation: DataTruncation is an exception that reports a DataTruncation warning (on reads) or throws a DataTruncation exception (on writes) when JDBC unexpectedly truncates a data value The SQLException class extends the javalangException class and defines an additional method called getNextException() This allows JDBC classes to chain a series of SQLException objects together In addition, the SQLException class defines the getMessage(), getSQLState(), and getErrorCode() methods to provide additional information about an error or exception In general, a JDBC client application might have a catch block that looks something like this: String dbURL = ..; String dbUser = ..; String dbPassword = ..; Connection conn = null; try { conn = DriverManager.

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In this chapter we ll see different ways of validating forms. We will be covering following recipes, from basic blank-field checking through to more complex password and field-disabling techniques: Confirming a required field is not left blank Validating a numerical field Validating phone numbers Validating a user ID Validating a date Validating an email address Checking whether a checkbox is checked Finding whether a radio button is selected Checking whether an option in a select element is selected Applying styles to options and a form button Checking and unchecking all checkboxes together Validating two fields Matching the password and confirm password fields Disabling certain fields Validating a complete form Serializing form data

System.out.println("name="+name); System.out.println("badgeNumber="+badgeNumber); System.out.println("age="+age); System.out.println("----------------------"); } } catch (Exception e) { e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); } } } To run the solution for an Oracle database, use this code: $ javac Demo_Statement_GetObjectValues_Oracle.java $ java Demo_Statement_GetObjectValues_Oracle --Demo_Statement_GetObjectValues_Oracle begin-conn=oracle.jdbc.driver.OracleConnection@860d49 --------------name=alex smith badgeNumber=1122 age=45 ---------------------name=bob taylor badgeNumber=1155 age=26 ----------------------

The following example deletes the Oracle OBJECT structures and tables created in the earlier sections. Connection conn = null; Statement stmt = null; try { // create Connection object conn = getConnection(); System.out.println("conn="+conn); // create Statement object stmt = conn.createStatement(); // drop table employee and type employee_type // Oracle's FORCE means ignore referential integrity stmt.execute("DROP TABLE employee"); stmt.execute("DROP TYPE employee_type FORCE"); } catch (SQLException e) { // handle the exception }

getConnection(dbURL, dbUser, dbPassword); // // when you are here, it means that an exception has not // happened and you can use the connection object // (ie, conn) to do something useful with the database .. }.

You have a text-input field in a form and you want to ensure its not left blank. The user will get an error message unless he enters the required data in the field.

finally { // clean up }

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