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mysql> show tables; +-------------------+ | Tables_in_octopus | +-------------------+ | emps_roles | | emps_table | | roles_table | +-------------------+ 3 rows in set (0.00 sec) mysql> create view admin_roles as select role, description -> from roles_table where role like 'admin%'; Query OK, 0 rows affected (0.03 sec) mysql> desc admin_roles; +-------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+-------------+------+-----+---------+-------+ | role | varchar(5) | NO | | | | | description | varchar(25) | NO | | | | +-------------+-------------+------+-----+---------+-------+ 2 rows in set (0.02 sec) mysql> create view yahoo_emails as select * from emps_table -> where email like '%@yahoo.com'; Query OK, 0 rows affected (0.01 sec) mysql> desc yahoo_emails; +--------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------+-------------+------+-----+---------+-------+ | badge_number | varchar(5) | NO | | | | | name | varchar(20) | NO | | | | | email | varchar(20) | NO | | | | +--------------+-------------+------+-----+---------+-------+ 3 rows in set (0.02 sec) mysql> show tables; +-------------------+ | Tables_in_octopus | +-------------------+ | admin_roles | | emps_roles | | emps_table | | roles_table | | yahoo_emails | +-------------------+ 5 rows in set (0.00 sec)

You have a table consisting of a few rows and columns. You want to make it so that when the mouse pointer moves over any row, that row is highlighted, and when the user clicks on any row, all the other rows disappear.

The DriverManager class provides three static (class-level) methods for getting connections, as explained in Table 3-1. Table 3-1. Getting the Connection Object

static Connection getConnection (String url) static Connection getConnection (String url, Properties info)

For this solution we will use the same HTML and style sheet file (style.css) that we used in Recipe 7-1. The jQuery code to highlight the row that is hovered over and to make all the rows become invisible (except the one that is clicked) is shown here: $(document).ready(function() { $('tbody tr').hover( function(){ $(this).find('td').addClass('hover'); }, function(){ $(this).find('td').removeClass('hover'); } ); $('tbody tr').click(function(){ $('table').find('tbody tr').hide(); $(this).show(); }); });

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$ sqlplus.exe scott/tiger SQL> create view my_view as select * from emp where empno > 1000; View created. SQL> desc my_view; Name Null Type ----------------------------------------- -------- -------------EMPNO NOT NULL NUMBER(4) ENAME VARCHAR2(10) JOB VARCHAR2(9) MGR NUMBER(4) HIREDATE DATE SAL NUMBER(7,2) COMM NUMBER(7,2) DEPTNO NUMBER(2) SQL> desc bonus; Name Null Type ----------------------------------------- -------- ------------ENAME VARCHAR2(10) JOB VARCHAR2(9) SAL NUMBER COMM NUMBER SQL> create view big_salary as select * from bonus where sal > 200000; View created. SQL> desc big_salary; Name Null Type ----------------------------------------- -------- ------------ENAME VARCHAR2(10) JOB VARCHAR2(9) SAL NUMBER COMM NUMBER SQL> select object_name, object_type from user_objects where object_type = 'TABLE' or object_type = 'VIEW'; OBJECT_NAME OBJECT_TYPE ----------- ----------DEPT TABLE EMP TABLE BONUS TABLE SALGRADE TABLE MYTABLE TABLE BIG_SALARY VIEW MY_VIEW VIEW 7 rows selected.

Summary

Attempts to establish a connection to the given database URL. Attempts to establish a connection to the given database URL; the info parameter is a list of arbitrary string key-value pairs as connection arguments. Normally here at least a user and password property should be included. Each vendor has a different set of keys. Attempts to establish a connection to the given database URL.

In the first half of the jQuery code, we attach the hover() event to the tr (row elements) that are nested inside the tbody element, as we want only the rows that contain student information to exhibit the hover behavior, and not the row that contains column headings. In the event-handling function of the hover event, we search for the td elements of the hovered-over row and apply the properties defined in the style rule .hover (that exists in the style sheet file style.css) to change their background and foreground colors to blue and white, respectively, to highlight them. In the second half of the jQuery code, we attach the click event to all the tr elements (nested inside the tbody element), and in its event-handling function, we search for all the tr elements (that are nested inside the tbody element) and make all of them invisible; that is, all the rows of the table except the column headings will be invisible. Thereafter, we make the contents of the row that was clicked visible, hence making only the clicked row appear in the table. On hovering over any row of the table, the table may appear as shown in Figure 7-8.

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