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A primary key constraint (PKC) is a rule against one or more columns of a table that requires their combination of values to be unique for a row within the table. Hey, that s just like a unique key! One big difference is that the unique key called the primary key is acknowledged to be the primary key, or primary index, of the table. Semantics, right No, not really, as you ll see when I talk about foreign keys in the next section. You should have a primary key constraint defined for every table in your database. I say should, because it isn t mandatory, but it s a really good idea. Listing 1-7 shows the DDL to create a primary key constraint against the author table. Listing 1-7. DDL to Create a Primary Key Constraint Against the Author Table, author_pk.pkc 1 2 3 4 ALTER TABLE author ADD CONSTRAINT author_pk primary key ( id ); The syntax used in Listing 1-7 for creating a primary key constraint is as follows: ALTER TABLE <table_name> ADD CONSTRAINT <constraint_name> PRIMARY KEY ( <column_name_1>, <column_name_2>,... <column_name_N> ); where <table_name> is the name of the table, <constraint_name> is the name of the primary key constraint, and <column_name> is a column to use in the constraint. Now that you have a primary key defined on the author table, you can point to it from the publication table.

Let s start by creating the entry page for the Techconf system, in which we will list the available conferences. First we start by implementing the controller class, ListConferenceController as shown in Listing 6-27. Listing 6-27. ListConferencesController Class package com.integrallis.techconf.spring.web; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.AbstractController; import com.integrallis.techconf.dto.ConferenceSummary; import com.integrallis.techconf.service.ConferenceService;

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A foreign key is one or more columns from another table that point to, or are connected to, the primary key of the first table. Since primary keys are defined using primary key constraints, it follows that foreign keys are defined with foreign key constraints (FKC). However, a foreign key constraint is defined against a dependent, or child, table. So what s a dependent or child table Well, in our example, we know that the publication table is dependent on, or points to, the author table. So we ll need to define a foreign key constraint against the publication table, not the author table. The foreign key constraint is represented by the relation (line with crow s feet) in the ERD in Figure 1-1.

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Listing 1-8 shows the DDL to create a foreign key constraint against the publication table that defines its relationship with the author table in the database. Listing 1-8. DDL for Creating a Foreign Key Constraint Against the Publication Table, publication_fk1.fkc 1 2 3 4 ALTER TABLE publication ADD CONSTRAINT publication_fk1 FOREIGN KEY (id) REFERENCES author (id); The syntax used in Listing 1-8 for creating a foreign key constraint is as follows: ALTER TABLE <table_name> ADD CONSTRAINT <constraint_name> FOREIGN KEY ( <column_name_1>, <column_name_2>, <column_name_N> ) REFERENCES <referenced_table_name> ( <column_name_1>, <column_name_2>, <column_name_N> ); where <table_name> is the name of the table to be constrained, <constraint_name> is the name of the foreign key constraint, <referenced_table_name> is the name of the table to be referenced (or pointed to), and <column_name> is a column that is both part of the referenced table s key and corresponds to a column with the same value in the child or dependent table. As my mother-in-law would say, But what do you get for that Now that you have a foreign key defined on the publication table, you can no longer delete a referenced row in the author table. Or, put another way, you can t have any parentless children in the publication table. That s why the primary and foreign key constraints in SQL jargon are called referential integrity constraints. They ensure the integrity of the relational references between rows in related tables. Many developers ask me: Ooooh, do I really have to use foreign keys My answer is always, Yes it s a relational database, isn t it

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