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The PREPARE statement, shown in Figure 18-5, is unique to dynamic SQL. It accepts a host variable containing a SQL statement string and passes the statement to the DBMS. The DBMS compiles the statement text and prepares it for execution by generating an application plan. The DBMS sets the SQLCODE/SQLSTATE variables to indicate any errors detected in the statement text. As described previously, the statement string can contain a parameter marker, indicated by a question mark, anywhere that a constant can appear. The parameter marker signals the DBMS that a value for the parameter will be supplied later, when the statement is actually executed. As a result of the PREPARE statement, the DBMS assigns the specified statement name to the prepared statement. The statement name is a SQL identifier, like a cursor name. You specify the statement name in subsequent EXECUTE statements when you want to execute the statement. DBMS brands differ in how long they retain the prepared statement and the associated statement name. For some brands, the prepared statement can be reexecuted only until the end of the current transaction (that is, until the next COMMIT or ROLLBACK statement). If you want to execute the same dynamic statement later during another transaction, you must prepare it again. Other brands relax this restriction and retain the prepared statement throughout the current session with the DBMS. The ANSI/ISO SQL2 standard acknowledges these differences and explicitly says that the validity of a prepared statement outside of the current transaction is implementation dependent. The PREPARE statement can be used to prepare almost any executable DML or DDL statement, including the SELECT statement. Embedded SQL statements that are actually precompiler directives (such as the WHENEVER or DECLARE CURSOR statements) cannot be prepared, of course, because they are not executable.

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The EXECUTE statement, shown in Figure 18-6, is unique to dynamic SQL. It asks the DBMS to execute a statement previously prepared with the PREPARE statement. You can execute any statement that can be prepared, with one exception. Like the EXECUTE IMMEDIATE statement, the EXECUTE statement cannot be used to execute a SELECT statement, because it lacks a mechanism for handling query results. If the dynamic statement to be executed contains one or more parameter markers, the EXECUTE statement must provide a value for each of the parameters. The values can be provided in two different ways, described in the next two sections. The ANSI/ ISO SQL2 standard includes both of these methods.

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Before you can store data in a database, you must first define the structure of the data. Suppose you want to expand the sample database by adding a table of data about the products sold by your company. For each product, the data to be stored includes: a three-character manufacturer ID code, a five-character product ID code, a description of up to thirty characters, the price of the product, and the quantity currently on hand.

Codd s article triggered a flurry of relational database research, including a major research project within IBM. The goal of the project, called System/R, was to prove the workability of the relational concept and to provide some experience in actually implementing a relational DBMS. Work on System/R began in the mid-1970s at IBM s Santa Teresa laboratories in San Jose, California. In 1974 and 1975, the first phase of the System/R project produced a minimal prototype of a relational DBMS. In addition to the DBMS itself, the System/R project included work on database query languages. One of these languages was called SEQUEL, an acronym for Structured English Query Language. In 1976 and 1977, the System/R research prototype was rewritten from scratch, and the new implementation was distributed to selected IBM customers for evaluation in 1978 and 1979. These early customer sites provided some actual user experience with System/R and its database language, which, for legal reasons, had been renamed SQL, or Structured Query Language. In 1979, the System/R research project came to an end, with IBM concluding that relational databases were not only feasible, but also could be the basis for a useful commercial product.

Figure 18-5.

The System/R project and its SQL database language were well-chronicled in technical journals during the 1970s. Seminars on database technology featured debates on the merits of the new and heretical relational model. By 1976, it was apparent that IBM was becoming enthusiastic about relational database technology and that it was making a major commitment to SQL.

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Dynamic SQL *

Year 1970 1974 1974 1978 1979 1981 1981 1982 1983 1986 1986 1987 1988 1989 1990 1991 1992 1992 1992 1993 1993 1994 1995 1996 1997 1997 1998 1998 1998 1999 1999 2000 2000 2001 2001 2002 2003 2006 2006 2008 2008

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Figure 18-6.

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