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I It is relatively easy for programmers to learn how to write programs that access the database. I Capabilities available through the interactive query language are also automatically available to application programs. I The SQL statements to be used in a program can be tried out first using interactive SQL and then coded into the program. I Programs can work with tables of data and query results instead of navigating their way through the database. This chapter summarizes the types of programmatic SQL offered by the leading SQL-based products and then describes the programmatic SQL used by the IBM SQL products, which is called embedded SQL.

SQL is a language and can be used programmatically, but it would be incorrect to call SQL a programming language. SQL lacks even the most primitive features of real programming languages. It has no provision for declaring variables, no GOTO statement, no IF statement for testing conditions, no FOR, DO, or WHILE statements to construct loops, no block structure, and so on. SQL is a database sublanguage that handles specialpurpose database management tasks. To write a program that accesses a database, you must start with a conventional programming language, such as COBOL, PL/I, FORTRAN, Pascal, or C and then add SQL to the program. The initial ANSI/ISO SQL standard was concerned exclusively with this programmatic use of SQL. In fact, the standard did not even include the interactive SELECT statement described in s 6 through 9. It only specified the programmatic SELECT statement described later in the section Data Retrieval in Embedded SQL. The SQL2 standard, published in 1992, expanded its focus to include interactive SQL (called direct invocation of SQL in the standard) and more advanced forms of programmatic SQL (the dynamic SQL capabilities described in 20). Commercial SQL database vendors offer two basic techniques for using SQL within an application program: I Embedded SQL. In this approach, SQL statements are embedded directly into the program s source code, intermixed with the other programming language statements. Special embedded SQL statements are used to retrieve data into the program. A special SQL precompiler accepts the combined source code and, along with other programming tools, converts it into an executable program.

There are a number of ways that we can design our buildings to stay at a pleasant internal temperature, and prevent them from overheating, even in the summer.

In this chapter, we ll have a look at how SQL is used in applications. An application is a set of computer programs designed to solve a particular business problem, such as an order-entry system, a payroll-processing system, or an accounting system. Applications can be built using a general-purpose procedural programming language such as Java, C, or C++, or a programming environment such as the Microsoft .NET Framework. A procedural programming language speci es an explicit sequence of steps to follow in order to complete a transaction. In applications that use relational databases, the application developers use various techniques for communicating with the database, which of course includes sending SQL statements to the database for processing and dealing with the results. This chapter explores some of those techniques.

17:

with a primary key that was NULL (or partially NULL, if the primary key is composed of more than one column). Because of the NULL value, the DBMS cannot conclusively decide whether the primary key duplicates one that is already in the table. The answer must be maybe, depending on the real value of the missing (NULL) data. For this reason, the SQL standard requires that every column that is part of a primary key must be declared NOT NULL. The same restriction applies for every column that is named in a uniqueness constraint. Together, these restrictions ensure that columns that are supposed to contain unique data values in each row of a table actually do contain unique values.

4 discussed primary keys, foreign keys, and the parent/child relationships that they create between tables. Figure 11-1 shows the SALESREPS and OFFICES tables and illustrates once again how foreign keys and primary keys work. The OFFICE column is the primary key for the OFFICES table, and it uniquely identifies each row. The REP_OFFICE column, in the SALESREPS table, is a foreign key for the OFFICES table. It identifies the office where each salesperson is assigned. The REP_OFFICE and OFFICE columns create a parent/child relationship between the OFFICES and SALESREPS rows. Each OFFICES (parent) row has zero or more

Figure 11-1.