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The data type formats that DB2 uses to receive parameter values and return query results are those supported by the IBM S/370 architecture mainframes that run DB2. Because it was designed as a portable DBMS, Oracle uses its own internal data type formats. Oracle automatically converts between its internal data formats and those of the computer system on which it is running when it receives parameter values from your program and when it returns query results to your program. Your program can use the Oracle SQLDA to control the data type conversion performed by Oracle. For example, suppose your program uses the DESCRIBE statement to describe the results of a dynamic query and discovers (from the data type code in the SQLDA) that the first column contains numeric data. Your program can request conversion of the numeric data by changing the data type code in the SQLDA before it fetches the data. If the program places the data type code for a character string into the SQLDA, for example, Oracle will convert the first column of query results and return it to your program as a string of digits. The data type conversion feature of the Oracle SQLDA provides excellent portability, both across different computer systems and across different programming languages. A similar feature is supported by several other DBMS brands, but not by the IBM SQL products.
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The SQL1 standard did not address dynamic SQL, so the de facto standard for dynamic SQL, as described in the preceding sections, was set by IBM s implementation in DB2. The SQL2 standard explicitly included a standard for dynamic SQL, specified in a separate chapter of the standard that is nearly 50 pages long. In the simplest areas of dynamic SQL, the new SQL2 standard closely follows the dynamic SQL currently used by commercial DBMS products. But in other areas, including even the most basic dynamic SQL queries, the new standard introduces incompatibilities with existing DBMS products, which will require the rewriting of applications. The next several sections describe the SQL2 standard for dynamic SQL in detail, with an emphasis on the differences from the DB2-style dynamic SQL described in the preceding sections. In practice, support for SQL2-style dynamic SQL is appearing slowly in commercial DBMS products, and most dynamic SQL programming still requires the use of the old, DB2-style dynamic SQL. Even when a new version of a DBMS product supports the new SQL2 statements, the DBMS vendor always provides a precompiler option that accepts the old dynamic SQL structure used by the particular DBMS. Often, this is the default option for the precompiler, because with thousands and thousands of SQL programs already in existence, the DBMS vendor has an absolute requirement that new DBMS versions do not break old programs. Thus, the migration to portions of SQL2 that represent incompatibilities with current practice will be a slow and evolutionary one.
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The SQL2 statements that implement basic dynamic SQL statement execution (that is, dynamic SQL that does not involve database queries) are shown in Figure 18-17. These statements closely follow the DB2 structure and language. This includes the single-step and two-step methods of executing dynamic SQL statements. The SQL2 EXECUTE IMMEDIATE statement has an identical syntax and operation to that of its DB2 counterpart. It immediately executes the SQL statement passed to the DBMS as a character string. Thus, the EXECUTE IMMEDIATE statement in Figure 18-3 conforms to the SQL2 standard. The SQL2 PREPARE and EXECUTE statements also operate identically to their DB2-style counterparts. The PREPARE statement passes a text string containing a SQL statement to the DBMS and causes the DBMS to analyze the statement, optimize it, and build an application plan for it. The EXECUTE statement causes the DBMS to actually execute a previously prepared statement. Like the DB2 version, the SQL2 EXECUTE statement optionally accepts host variables that pass the specific values to be used when executing the SQL statement. The PREPARE and EXECUTE statements in Figure 18-4 (called out as item 2) thus conform to the SQL2 standard. Two useful extensions to the PREPARE/EXECUTE structure are a part of the Full compliance level SQL2 standard specification (neither is part of the Entry or Intermediate compliance levels). The first is a useful companion to the PREPARE statement that unprepares a previously compiled dynamic SQL statement. The
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Figure 18-17.
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