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In the current version of MySQL (version 4.0.8), only InnoDB table types support the foreign key concept. According to MySQL, starting with MySQL 5.1, foreign keys will be supported for all table types, not just InnoDB. Let s create two tables (dept_table and emp_table) and define the PK and FK. Keep in mind that if you violate the PK and FK rules, the SQL INSERT operation will fail.

This shows how to run the solution: $ javac DemoGetGeneratedKeys.java $ java DemoGetGeneratedKeys mysql -- DemoGetGeneratedKeys_MySQL begin -conn=com.mysql.jdbc.Connection@15c7850 --------------key 1 is 4 -- DemoGetGeneratedKeys_MySQL end --

These parameters are as follows: url is the server-side script that you want to execute via GET method parameters is key/value pair that you want to be passed to the server-side script for processing callback is the function that is invoked on completion of the request. It contains two parameters, the first is the response from the server side script and the second parameter is the status of execution

This shows the MySQL database after running the solution: mysql> select * from animals_table; +----+---------+ | id | name | +----+---------+ | 1 | dog | | 2 | cat | | 3 | rabbit | | 4 | tiger11 | +----+---------+ 4 rows in set (0.01 sec)

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$ mysql --user=root --password=root Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 to server version: 4.0.18-nt mysql> use octopus; Database changed mysql> create table emps_table ( -> badge_number varchar(5) not null, -> name varchar(20) not null, -> email varchar(20) not null, -> -> primary key (badge_number) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.24 sec) mysql> create table roles_table ( -> role varchar(5) not null, -> description varchar(25) not null, -> -> primary key (role) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.13 sec) mysql> create table emps_roles ( -> badge_number varchar(5) not null, -> role varchar(5) not null, -> -> primary key (badge_number, role), -> INDEX badge_number_index (badge_number), -> foreign key (badge_number) references emps_table(badge_number), -> INDEX role_index (role), -> foreign key (role) references roles_table(role) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.24 sec) mysql> insert into roles_table(role, description) values('dba', 'database administrator'); mysql> insert into roles_table(role, description) values('mgr', 'database manager'); mysql> insert into roles_table(role, description) values('dev', 'database developer'); mysql> insert into emps_table(badge_number, name, email) values('11111', 'Alex', 'alex@yahoo.com'); mysql> insert into emps_table(badge_number, name, email) values('22222', 'Mary', 'mary@yahoo.com');

11-9. How Do You Retrieve Automatically Generated Keys Using a Statement (Oracle)

So let s modify the JavaScript that we saw above to now use the $.get() method. Your code should look something like this: $(document).ready(function() { $('#submit').click(function () { var name = $('.uname').val(); var data = 'uname=' + name; $.get( "welcome.php", data, function (html) { $('#message').html(html); } ); return false; }); }); You can see that the $.get() method invokes the welcome.php file on the server and passes uname=name to it as a parameter (where name stores the name entered by the user) and the callback function displays the response (from the server) by assigning it to the div element of id message. The output we will get the same as shown in Figure 8-1 and 8-2 above.

The Oracle database allows for certain columns to be given automatically generated key values. When using automatically generated key values, an insert statement is not responsible for supplying a value for the column. The database generates a unique value for the column and inserts the value. You can use this technique for generating unique primary keys. The Oracle database uses the SEQUENCE objects for generating key values. What is a SEQUENCE object SEQUENCE is an Oracle database object that does the following: Automatically generates unique numbers Is a sharable object Is typically used to create a primary key value Replaces application code Speeds up the efficiency of accessing sequence values when cached in memory

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