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Our solution generates result set metadata for a given table identified with the tableName parameter. Using tableName, we create the following query (note that Oracle requires the table name to be in uppercase characters, while MySQL does not care): String query = "select * from " + tableName.toUpperCase() + " where 1 = 0"; Then, we execute query (note that our query does not select any records from a given table because the where clause is always false) and then call the getResultSetMetaData (ResultSet rs) method. The reason for conversion of table name to uppercase characters is that some databases (such as Oracle) prefer, or even require, table names in uppercase. /** * Get table's column names and their associated attributes * (type, size, nullable) The result is returned as XML * (as a String object); if table name is null/empty * it returns null. * * @param conn the Connection object. * @param tableName the table name. * @return result set's metadata as an XML as String object;

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We can see in the first HTML file that the label is set to display the text Enter Age and an error message is assigned the text: Only numerals allowed Also, the label, text-input field, error message, and Submit button are assigned different class names (label, infobox, error, and submit) so as to apply the properties defined in the class selectors (defined in the style sheet stylecss) to them In this recipe, we use the same external style sheet stylecss that we used in Recipe 4-1 We can see in the jQuery code in the section Allowing Only Numerical Values that the error message is initially set to invisible The click event is attached to the Submit button so as to execute its event-handling function if the Submit button is clicked.

public static Connection getConnection() throws Exception { String driver = "org.gjt.mm.mysql.Driver"; String url = "jdbc:mysql://localhost/snipit"; String username = "root"; String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); } public static void usage() { System.out.println("usage: DeleteNode "); System.out.println("Example-1: DeleteNode Bob true"); System.out.println("Example-2: DeleteNode Bob false"); System.exit(1); } public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; try { System.out.println("------DeleteNode begin---------"); if (args.length != 2) { usage(); } conn = getConnection(); System.out.println("conn="+conn); String ID = args[0]; // node with value of ID will be deleted String promoteSubtreeAsString = args[1]; System.out.println("ID="+ID); System.out.println("promoteSubtree="+promoteSubtreeAsString); if ((promoteSubtreeAsString == null) || (promoteSubtreeAsString.length() == 0)) { usage(); } boolean promoteSubtree = false; if (promoteSubtreeAsString.equals("true")) { promoteSubtree = true; } else if (promoteSubtreeAsString.equals("false")) { promoteSubtree = false; } else { usage(); } String getLeftRight = "select parent, lft, rgt from folders where id = "; pstmt = conn.prepareStatement(getLeftRight); pstmt.setString(1, ID); ResultSet rs = pstmt.executeQuery(); rs.next(); String parentID = rs.getString(1);

* this metadata includes column names and their associated * attributes: type, size, nullable. * @exception Failed to get the result set's metadata as XML. */ public static String getTableMetaData(Connection conn, String tableName) throws Exception { Statement stmt = null; ResultSet rs = null; String query = null; try { if ((conn == null) || (tableName == null) || (tableName.length() == 0)) { return null; } query = "select * from "+ tableName.toUpperCase() + " where 1 = 0"; stmt = conn.createStatement(); rs = stmt.executeQuery(query); // Retrieves the number, types and properties // of this ResultSet object's columns. return getResultSetMetaData(rs); } finally { DatabaseUtil.close(rs); DatabaseUtil.close((stmt); } }

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