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First, I haven t shown any examples with nested types. For example, I could create a TYPE ADDRESS_O for address information, and then use that TYPE as an attribute in another TYPE like CONTACT_O. You can do that; it s not a problem. Nor have I shown you any examples of a TYPE that contain arrays of other TYPEs. That s certainly possible. You can create what is called a nested TYPE, and implement it as a nested table where you can have an unlimited number of entries, or as a varying array that has a fixed number of entries. I don t like the sound of the latter. It s not very relational in nature. And nesting is where all the so-called impedance mismatch occurs. In the minds of some object-oriented programmers, it s necessary to create huge, complex, object types that contain everything remotely similar. You know, if you re an object-oriented programmer, you ve seen them, or worse, created them. Consider Figure 6-1, a class diagram to replace the ERD for our problem domain from 1. Are all three historical entities LocgicalAssignment, PhysicalAssignment, and WorkAssignment part of Worker in an object-oriented setting No, they may be related, but you won t find them on any particular worker, will you They are actually stand-alone entities.

After a list is in production, it can become apparent that users are confused by column names, are skipping important fields, and are entering data incorrectly in others. We know this probably isn t your users, but just in case you want to give advice to another list manager, you should know that you can change a column s name, its description, its required setting, and in some cases, even the column type. You can also delete columns that you no longer need.

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After opening the connection, you re now at the stage we ve been aiming for from the start: executing SQL commands through the connection. You can execute the command in many ways, depending on the specifics. Does the SQL query you want to execute return any data If so, what kind of data, and in which format The PDO methods that we ll use to execute SQL queries are PDOStatement::execute is used to execute an INSERT, an UPDATE, or DELETE query. PDOStatement::fetch is used to retrieve one row of data from the database. PDOStatement::fetchAll is used to retrieve multiple rows of data from the database. PDO::prepare prepares an SQL query to be executed, creating a so-called prepared statement. A prepared statement is a parameterized SQL query whose parameter values are replaced by either parameter markers ( ) or named variables (:variable_name), like in these examples: $query1 = "SELECT name FROM department WHERE department_id = " $query1 = "SELECT name FROM department WHERE department_id = :dept_id"

However, in most cases, someone would create a class Worker that contained these three entities as arrays. There s the mismatch. It s a break between reality and programming convenience.

To execute a prepared statement, you supply the parameter values to the functions that execute your query, which take care to build the complete SQL query for you. To implement the list of departments, you won t need to work with parameters, but you ll learn how to handle them in 4. Nonprepared statements can be executed with PDO using the PDO::exec, in which case, you need to create the string of the SQL query, including its parameters. In this book, we ll always use prepared statements because they bring two important benefits: Parameter values are checked to prevent injection attacks. The query will likely execute faster with prepared statements because the database server can reuse the access plan it builds for a prepared statement. To be able to reuse more of the database handling code and to have a centralized errorhandling mechanism for the database code, we won t be using the PDO methods directly from the business tier of our application. Instead, we ll wrap the PDO functionality into a class named DatabaseHandler, and we ll use this class from the other classes of the business tier.

If you d like to change the name of the list, open the list, click Modify Settings and Columns in the Tip

WorkerType +workerTypeId +code +description +activeDate +inactiveDate +getId() +getId() +getCodeDescr() +getCodeIdDescr() +getCodeIdDescr() +help() +test() +toString() Worker +workerId +workerTypeId +externalId +firstName +middleName +lastName +birthDate +genderId +getAge() +getAge() +getBirthDate() +getExternalId() +getFormattedName() +getId() +getId() +getRow() +getUnformattedName() +help() +isDuplicate() +setRow() +test() +toString() 1..1 1..1

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