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System.out.println("parentID="+parentID); System.out.println("ID="+ID); String getParentLeftRight = "select lft, rgt from folders where id = "; pstmt = conn.prepareStatement(getParentLeftRight); pstmt.setString(1, parentID); rs = pstmt.executeQuery(); rs.next(); int pLeft = rs.getInt(1); int pRight = rs.getInt(2); int pLeftPlus1 = pLeft + 1; int pLeftPlus2 = pLeft + 2; String update1 = "update folders set rgt = rgt + 2 where rgt > "+ pLeft; String update2 = "update folders set lft = lft + 2 where lft > "+ pLeft; String insert = "insert into folders (id, parent, lft, rgt)"+ "values ('"+ID +"', '"+ parentID +"', 0, 0)"; String update3 = "update folders set lft = "+pLeftPlus1+ ", rgt = "+pLeftPlus2+ " where id = '"+ID+"'"; // start transaction for batch updates conn.setAutoCommit(false); stmt = conn.createStatement(); // create a set of batch operations stmt.addBatch(update1); stmt.addBatch(update2); stmt.addBatch(insert); stmt.addBatch(update3); // send batch operations to the database server int[] batchUpdateCounts = stmt.executeBatch(); // commit transaction for batch updates conn.commit(); conn.setAutoCommit(true); System.out.println("------InsertNode end---------"); } catch(BatchUpdateException be) { System.err.println("--- caught BatchUpdateException ---"); System.err.println("SQLState: " + be.getSQLState()); System.err.println("Message: " + be.getMessage()); System.err.println("Vendor: " + be.getErrorCode()); System.err.print("Update counts are: "); int[] batchUpdateCounts = be.getUpdateCounts(); for (int i = 0; i < batchUpdateCounts.length; i++) { System.err.print(batchUpdateCounts[i] + " "); } System.err.println(""); } catch(SQLException se) { System.err.println("--- caught SQLException ---"); System.err.println("SQLState: " + se.getSQLState()); System.err.println("Message: " + se.getMessage()); System.err.println("Vendor: " + se.getErrorCode()); }

Oracle s Limitations on ResultSetMetaData.getTableName() Note that the Oracle implementation of ResultSetMetaData does not provide table names for result set metadata. According to the Oracle documentation (http://www.oracle.com/ technology/sample_code/tech/java/codesnippet/jdbc/OracleResultSetMetaData.html), the OracleResultSetMetaData interface does not implement the getSchemaName() and getTableName() methods because the underlying protocol does not make this feasible.

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Since the purpose of the HTML form is to validate on the text-input field and not to send the entered data to some other page for processing, the action attribute of the form is left blank. The form is assigned an ID of signup and method is set to post though it will have no effect on our validation procedure. The label message User Id is enclosed in a span element of the class label. The text-input field is assigned a class name infobox and the error message ( This field cannot be blank ) is stored as a span element of the class error. Finally, the Submit button is assigned the class submit. The reasons for assigning the classes to all four items of the form is to apply the properties defined in the class selectors label, infobox, error, and submit (defined in the style sheet style.css) to be applied automatically to the respective four items of the form. The style sheet with the class selectors is shown here: style.css .label {float: left; width: 120px; } .infobox {width: 200px; } .error { color: red; padding-left: 10px; } .submit { margin-left: 125px; margin-top: 10px;}

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The client using MySQL database will use the mypictures table described here: mysql> describe mypictures; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | int(11) | | PRI | 0 | | | name | varchar(20) | YES | | NULL | | | photo | blob | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.00 sec) Client Using MySQL import java.util.*; import java.io.*; import java.sql.*; import jcb.db.*; import jcb.meta.*; public class TestMySqlResultSetMetaDataTool { public static Connection getConnection() throws Exception { String driver = "org.gjt.mm.mysql.Driver"; String url = "jdbc:mysql://localhost/octopus"; String username = "root"; String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); } public static void main(String[] args) { Connection conn = null; Statement stmt = null; ResultSet rs = null; try { conn = getConnection(); // Create a result set stmt = conn.createStatement(); rs = stmt.executeQuery("SELECT * FROM mypictures");

catch (Exception e) { // other exceptions e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(rs); DatabaseUtil.close(pstmt); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); } } }

The jQuery code to check that the age entered in the text field contains only numerical values, and that no text or symbols have been entered, is shown here:

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