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To insert Mike under Bert, use this code: C:\mp\sql-trees>java InsertNode Bert Mike ------InsertNode begin--------conn=com.mysql.jdbc.Connection@750159 parentID=Bert ID=Mike ------InsertNode end--------mysql> select * from folders; +---------+--------+------+------+ | id | parent | lft | rgt | +---------+--------+------+------+ | Albert | NULL | 1 | 14 | | Bert | Albert | 2 | 5 | | Chuck | Albert | 6 | 13 | | Donna | Chuck | 7 | 8 | | Eddie | Chuck | 9 | 10 | | Fred | Chuck | 11 | 12 | | Mike | Bert | 3 | 4 | +---------+--------+------+------+ 7 rows in set (0.00 sec) To insert Mary under Bert, use this code: $ java InsertNode Bert Mary ------InsertNode begin--------conn=com.mysql.jdbc.Connection@750159 parentID=Bert ID=Mary ------InsertNode end--------mysql> select * from folders; +---------+--------+------+------+ | id | parent | lft | rgt | +---------+--------+------+------+ | Albert | NULL | 1 | 16 | | Bert | Albert | 2 | 7 | | Chuck | Albert | 8 | 15 | | Donna | Chuck | 9 | 10 | | Eddie | Chuck | 11 | 12 | | Fred | Chuck | 13 | 14 | | Mike | Bert | 5 | 6 | | Mary | Bert | 3 | 4 | +---------+--------+------+------+ 8 rows in set (0.00 sec) To insert Jeff under Albert, use this code: $ java InsertNode Albert Jeff ------InsertNode begin--------conn=com.mysql.jdbc.Connection@750159 parentID=Albert ID=Jeff ------InsertNode end--------mysql> select * from folders;

+---------+--------+------+------+ | id | parent | lft | rgt | +---------+--------+------+------+ | Albert | NULL | 1 | 18 | | Bert | Albert | 4 | 9 | | Chuck | Albert | 10 | 17 | | Donna | Chuck | 11 | 12 | | Eddie | Chuck | 13 | 14 | | Fred | Chuck | 15 | 16 | | Mike | Bert | 7 | 8 | | Mary | Bert | 5 | 6 | | Jeff | Albert | 2 | 3 | +---------+--------+------+------+ 9 rows in set (0.00 sec)

You have a text field for entering the age of the person and you want to confirm that a numerical value is entered in it and no character or symbol is entered.

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Client Using Oracle import java.util.*; import java.io.*; import java.sql.*; import jcb.db.*; import jcb.meta.*; public class TestOracleResultSetMetaDataTool { public static Connection getConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@localhost:1521:maui"; String username = "octopus"; String password = "octopus"; 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 { conn = getConnection(); // Create a result set stmt = conn.createStatement(); rs = stmt.executeQuery("SELECT * FROM employees"); System.out.println("-------- getResultSetMetaData -------------"); System.out.println("conn="+conn); String rsMetaData = ResultSetMetaDataTool.getResultSetMetaData(rs); System.out.println(rsMetaData); System.out.println("------------------------------------"); } catch(Exception e){ e.printStackTrace(); System.exit(1); } finally { DatabaseUtil.close(stmt); DatabaseUtil.close(rs); DatabaseUtil.close(conn); } } }

This shows InsertNode.java: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 19 20 21 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 import import import import import import import import public java.sql.Connection; java.sql.Statement; java.sql.PreparedStatement; java.sql.ResultSet; java.sql.DriverManager; java.sql.BatchUpdateException; java.sql.SQLException; jcb.util.DatabaseUtil; class InsertNode {

The HTML code to display the form that contains a label, a text-input field, an error message, and a Submit button is as shown here: <body> <form id="signup" method="post" action=""> <div><span class="label">Enter Age </span><input type="text" /><span class="error"> Only numericals allowed</span></div> <input class="submit" type="submit" value="Submit"> </form> </body>

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 main(String[] args) { Connection conn = null; ResultSet rs = null; Statement stmt = null; PreparedStatement pstmt = null; try { System.out.println("------InsertNode begin---------"); if (args.length != 2) { System.out.println("usage: InsertNode System.exit(1); } conn = getConnection(); System.out.println("conn="+conn); String parentID = args[0]; String ID = args[1]; // node with value of ID will be inserted

Client Output Using Oracle -------- getResultSetMetaData ------------conn=oracle.jdbc.driver.OracleConnection@66e815 < xml version='1.0'> <resultSetMetaData columnCount="4"> <columnMetaData column="1" columnDisplaySize="22" columnLabel="BADGENUMBER" columnName="BADGENUMBER" columnType="2" columnTypeName="NUMBER" columnClassName="java.math.BigDecimal" tableName="" precision="38" scale="0" isAutoIncrement="false" isCurrency="true" isWritable="true" isDefinitelyWritable="false" isNullable="0" isReadOnly="false" isCaseSensitive="false" isSearchable="true" isSigned="true" catalog="" schema="" /> <columnMetaData column="2" columnDisplaySize="60" columnLabel="NAME" columnName="NAME" columnType="12" columnTypeName="VARCHAR2" columnClassName="java.lang.String" tableName="" precision="60" scale="0" isAutoIncrement="false" isCurrency="false" isWritable="true" isDefinitelyWritable="false" isNullable="1" isReadOnly="false" isCaseSensitive="true" isSearchable="true" isSigned="true" catalog="" schema="" /> <columnMetaData column="3" columnDisplaySize="30" columnLabel="EMPLOYEETYPE" columnName="EMPLOYEETYPE" columnType="12" columnTypeName="VARCHAR2" columnClassName="java.lang.String" tableName="" precision="30" scale="0" isAutoIncrement="false" isCurrency="false" isWritable="true" isDefinitelyWritable="false" isNullable="1" isReadOnly="false" isCaseSensitive="true" isSearchable="true" isSigned="true" catalog="" schema="" /> <columnMetaData column="4" columnDisplaySize="530" columnLabel="PHOTO" columnName="PHOTO" columnType="-13" columnTypeName="BFILE" columnClassName="oracle.sql.BFILE" tableName="" precision="0" scale="0" isAutoIncrement="false" isCurrency="false" isWritable="true" isDefinitelyWritable="false" isNullable="1" isReadOnly="false" isCaseSensitive="false" isSearchable="false" isSigned="true" catalog="" schema="" /> </resultSetMetaData> ------------------------------------

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class="infobox" name="age"

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