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I The DBMS maintains the data in the system tables, updating it as the structure of the database changes. I A user can query the system tables to find out information about tables, columns, and privileges in the database. I Front-end query tools use the system tables to help users navigate their way through the database in a user-friendly way. I The names and organization of the system tables differ widely from one brand of DBMS to another; and there are even differences among different DBMS products from the same vendor, reflecting the different internal structures and capabilities of the products. I The SQL2 standard does not require that a DBMS actually have a set of system catalog tables, but it does define a set of standard catalog views for products that claim higher levels of SQL2 conformance.
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In addition to its role as an interactive data access language, SQL supports database access by application programs. s 17 19 describe the special SQL features and techniques that apply to programmatic SQL. 17 describes embedded SQL, the oldest programmatic SQL technique, and one still supported by many SQL products. Dynamic SQL, an advanced form of embedded SQL that isused to build general-purpose database tools, is described in 18. 19 describes an alternative to embedded SQL the function call interface provided by several popular DBMS products, which has been gaining in popularity.
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SQL: The Complete Reference
QL is a dual-mode language. It is both an interactive database language used for ad hoc queries and updates and a programmatic database language used by application programs for database access. For the most part, the SQL language is identical in both modes. The dual-mode nature of SQL has several advantages:
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.
Programmatic SQL Techniques
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.
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