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Before using the descriptor, the program must create it, using the statement:
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ALLOCATE DESCRIPTOR parmdesc WITH MAX :parmcnt;
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This statement replaces the allocation of storage for the parmda data structure at callout 1 in Figure 18-8. The descriptor (named parmdesc) will perform the same functions as the parmda. Note that the program in Figure 18-8 had to calculate how much storage would be required for the parmda structure before allocating it. With the SQL descriptor, that calculation is eliminated, and the host program simply tells the DBMS how many items the variable part of the descriptor must be able to hold. The next step in the program is to set up the descriptor so that it describes the parameters to be passed their data types, lengths, and so on. The loop at callout 2 of the program remains intact, but again, the details of how the descriptor is initialized differ from those for the SQLDA. At callout 3 and callout 4, the data type and length for the parameter are specified with a form of the SET DESCRIPTOR statement, with this code excerpt:
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typecode = columns[i].typecode; length = columns[i].buflen; SET DESCRIPTOR parmdesc VALUE (:i + l) TYPE = :typecode SET DESCRIPTOR parmdesc VALUE (:i + l) LENGTH = :length;
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The differences from Figure 18-8 are instructive. Because the descriptor is maintained by the DBMS, the data type and length must be passed to the DBMS, through the SET DESCRIPTOR statement, using host variables. In this particular example, the simple variables typecode and length are used. Additionally, the data type codes in Figure 18-8 were specific to DB2. The fact that each DBMS vendor used different codes to represent different SQL data types was a major source of portability problems in dynamic SQL. The SQL standard specifies integer data type codes for all of the data types specified in the standard, eliminating this issue. The SQL standard data type codes are summarized in Table 18-2. So, in addition to the other changes, the data type codes in the columns structure of Figure 18-8 would need to be modified to use these SQL standard data type codes. The statements at callouts 5 and 6 in Figure 18-8 were used to bind the SQLDA structure to the program buffers used to contain the parameter data and the corresponding indicator variable. Effectively, they put pointers to these program buffers into the SQLDA for the use of the DBMS. With SQL descriptors, this type of binding is not possible. Instead, the data value and indicator value are specifically passed as host variables later in the program. Thus, the statements at callouts 5 and 6 would be eliminated in the conversion to standard SQL. The statement at callout 7 in Figure 18-8 sets the SQLDA to indicate how many parameter values are actually being passed to the DBMS. The SQL descriptor must similarly be set to indicate the number of passed parameters. This is done with a form of the SET DESCRIPTOR statement:
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SET DESCRIPTOR parmdesc COUNT = :parmcnt;
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Strictly speaking, this SET DESCRIPTOR statement should probably be placed earlier in the program and should be executed before those for the individual items. The SQL standard specifies a complete set of rules that describe how setting values in some parts of the descriptor causes values in other parts of the descriptor to be reset. For the most part, these rules simply specify the natural hierarchy of information.
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Data Type Data Type Codes (TYPE) INTEGER SMALLINT NUMERIC DECIMAL FLOAT REAL DOUBLE PRECISION CHARACTER CHARACTER VARYING BIT BIT VARYING DATE/TIME/TIMESTAMP INTERVAL Date/Time Subcodes (Interval_Code) DATE TIME TIME WITH TIME ZONE TIMESTAMP TIMESTAMP WITH TIME ZONE Date/Time Subcodes (Interval_Precision) YEAR MONTH DAY HOUR MINUTE SECOND YEAR MONTH DAY HOUR DAY MINUTE DAY SECOND HOUR MINUTE HOUR SECOND MINUTE SECOND
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