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Query OK, 0 rows affected (0.38 sec) mysql> select * from employees; +-----+--------+------+ | id | name | age | +-----+--------+------+ | 88 | Peter | 80 | | 77 | Donald | 70 | | 33 | Mary | 30 | | 44 | Monica | 40 | | 999 | Andre | 90 | +-----+--------+------+ 5 rows in set (0.00 sec) mysql> select count(*) from employees; +----------+ | count(*) | +----------+ | 5 | +----------+ 1 row in set (0.00 sec) mysql> CALL simpleproc(@a); Query OK, 0 rows affected (0.40 sec) mysql> SELECT @a; +------+ | @a | +------+ | 5 | +------+ 1 row in set (0.00 sec) mysql> show create procedure simpleproc; +------------+----------+----------------------------------------------------------+ | Procedure | sql_mode | Create Procedure | +------------+----------+----------------------------------------------------------+ | simpleproc | | CREATE PROCEDURE `octopus`.`simpleproc`(OUT param1 INT) | | | | BEGIN | | | | SELECT COUNT(*) INTO param1 FROM employees; | | | | END | +------------+----------+----------------------------------------------------------+ 1 row in set (0.00 sec) mysql> delimiter // mysql> CREATE PROCEDURE createEmp (IN idParam INTEGER, IN ageParam INTEGER) -> BEGIN -> DECLARE variable1 CHAR(10); -> IF idParam > 50 THEN -> SET variable1 = 'duck'; -> ELSE -> SET variable1 = 'dragon'; -> END IF;

Figure 4-4. Error message displayed if the character appears between the numerals Also, if we add any symbol, like a minus sign or an underscore, we get the error message, as shown in Figure 4-5.

level proprietary APIs used to interact with Oracle databases. It allows you to use operations such as logon, execute, parse, fetch, and so on. OCI programs are normally written in C or C++, although they can be written in almost any programming language; for details, see http://www.orafaq.com/ faqoci.htm.) You will need a driver for each database and operating system combination. Performance is faster than type 4 drivers.

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The type 3 driver is a multitier (n-tier) driver (see Figure 1-13). It is database-independent unlike the type 1, 2, and 4 drivers. Type 3 drivers connect to an application server (such as WebLogic). The application server in turn connects to a database using a type 1, 2, or 4 driver. The user just specifies the type 3 driver s class name and a data source name to connect to; there is no need to change the client code when the back-end database changes.

We can see in the jQuery code in the Allowing Negative Values section that the error message is hidden at the beginning The event-handling function of the click event attached to the Submit button extracts the data from the text-input field and stores it in variable data Each individual character stored in data is parsed with the help of a for loop In the loop, we convert each character in the data variable to its ASCII value and check whether the first character has an ASCII value of 45 (which is the ASCII value of the minus sign), then continue checking the rest of the characters without displaying any error message The second condition in the for loop is the one we saw earlier: checking if the characters in the data variable are numerical values and displaying the error message if not.

The type 4 driver is for databases that have written their APIs in Java, not C or C++ (see Figure 1-14). So, no translation is needed at runtime by the driver; it calls the database using its Java API. MySQL s Connector/J driver and Oracle s Thin driver are both type 4. Note that type 1, 2, and 4 are two-tier (client-server) drivers. In other words, there is no application server in the middle. You can use these drivers in typical client-server environments.

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