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The Oracle SQLDA
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Dynamic SQL*
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The L field points to an array of integers that specify the length of each buffer pointed to by the V array. The integers in this array correspond to the SQLLEN field in each DB2 SQLVAR structure. The I field points to an array of data pointers that specify the indicator variable for each query results column or named parameter. The pointers in this array correspond to the SQLIND field in each DB2 SQLVAR structure. The S field points to an array of string pointers that specify the buffers where Oracle is to return the name of each query results column or named parameter. The buffers pointed to by this array correspond to the SQLNAME structure in each DB2 SQLVAR structure. The M field points to an array of integers that specify the maximum length of the variable names. For DB2, the SQLNAME structure has a fixed-length buffer, so there is no equivalent to the M field. The C field points to an array of integers that specify the actual lengths of the names pointed to by the S array. When Oracle returns the column or parameter names, it sets the integers in this array to indicate their actual lengths. For DB2, the SQLNAME structure has a fixed-length buffer, so there is no equivalent to the C field. The X field points to an array of string pointers that specify the buffers where Oracle is to return the name of each named indicator parameter. These buffers are used only by the Oracle DESCRIBE BLIND LIST statement; they have no DB2 equivalent. The Y field points to an array of integers specifying the size of each buffer pointed to by the X array. There is no DB2 equivalent. The Z field points to an array of integers specifying actual lengths of the indicator parameter names pointed to by the X array. When Oracle returns the indicator parameter names, it sets the integers in this array to indicate their actual lengths. There is no DB2 equivalent.
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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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Programming with SQL
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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 (Part 3) of the standard that was nearly 50 pages long. Part 3 grew to over 400 pages when last updated in 2003. In the simplest areas of dynamic SQL, the SQL 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 standard introduces incompatibilities with existing DBMS products, which will require the rewriting of applications. The next several sections describe the SQL 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 SQL standard dynamic SQL has been slow to appear 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 SQL 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 the SQL standard that represent incompatibilities with current practice will be a slow and evolutionary one.
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