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In the jQuery code, we start by attaching the hover event to all the column headings of the table. In the event handler we find out the index location of the column heading that is being hovered over, and store it in the variable colindex. The index() method use zero-based counting; that is, it begins from zero. We then apply the style properties defined in the style rule .hover to the highlighted column heading and to the column whose index location is stored in the colindex variable (the one that is hovered over) to highlight them. Since the :nth-child() method is one-based, we increment the value of colindex by one before highlighting it. When the mouse pointer is moved away from the column headings, we remove the properties defined in the style rule .hover from all the rows of the table. In the click event handler we hide the column heading that has been clicked and find out its index, which we store in the colindex variable. Finally, we hide the column contents whose value is stored in the colindex variable (the index location of the column heading that is clicked). Hence, the column heading and the complete column contents will be made invisible when any of the column headings are clicked. On hovering over a column heading, it will be highlighted, along with the contents of the column, as shown in Figure 7-11.

Oracle treats schema as a database name, while MySQL treats catalog as a database name. So, in order to get the names of databases from Oracle, you must use getSchemas(); to get the names of databases from MySQL, you must use getCatalogs(). If you use getCatalogs() for an Oracle database, or getSchemas() for MySQL, it returns nothing (as null objects). In the

finally { // close the db resources such as Connection object DatabaseUtil.close(conn); } Each vendor has a special format for the database URL. For example, Table 3-3 shows sample database driver names and sample database URLs. (In Table 3-3, the server name is localhost, and the database name is scorpian.) Table 3-3. Vendor URL Formats

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Figure 8-11. Error messages of both userid and email address displayed If the userid is valid, then its error message will disappear, leaving behind the error message related to email address only as shown in Figure 8-12:

Oracle 8i Oracle 9i MySQL Microsoft Access Sybase (jConnect 4.2) Sybase (jConnect 5.2) MS SQL Server 2000 MS SQL Server 2000 IBM DB2

JDBC API, getSchemas() claims that it returns a set of two columns (table schema and table catalog), but in reality it just returns table schema, as a first column of the result set. Once again, this proves at least two points: You have to test your code against different databases; that is, databases can have different semantics by using the same JDBC API. When you define connections, make sure that the vendor parameter is defined. By knowing who the database vendor is, you can invoke the correct methods.

oracle.jdbc.driver.OracleDriver oracle.jdbc.driver.OracleDriver org.gjt.mm.mysql.Driver sun.jdbc.odbc.JdbcOdbcDriver com.sybase.jdbc.SybDriver com.sybase.jdbc2.jdbc.SybDriver com.microsoft.jdbc. sqlserver.SQLServerDriver weblogic.jdbc.mssqlserver4.Driver COM.ibm.db2.jdbc.net.DB2Connection

Figure 8-12. Error message for invalid email address appears Finally, if both the userid and the email address entered are valid, then they will be accepted without displaying any error message as shown in Figure 8-13:

jdbc:oracle:thin:@localhost: 1521:scorpian jdbc:oracle:thin:@localhost: 1521:scorpian jdbc:mysql://localhost/scorpian jdbc:odbc:scorpian jdbc:sybase:Tds:scorpian:2638 jdbc:sybase:Tds:scorpian:2638 jdbc:microsoft:sqlserver:// localhost:1433 jdbc:weblogic:mssqlserver4:database@ localhost:port jdbc:db2://localhost:6789/scorpian

$ mysql -u root -proot Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 36 to server version: 5.0.12-beta-nt Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | deanza | | mysql | | octopus | | test | +--------------------+ 5 rows in set (0.00 sec)

If you are using a JDBC driver developed by a third party, the documentation will tell you what to use for the driver name and the database URL format.

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