qr barcode generator vb.net Named Parameters in Software

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Named Parameters
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Although rep_number appears to be a host variable in the dynamic DELETE statement, it is in fact a named parameter. As shown in the example, the named parameter behaves exactly like the parameter markers in DB2. A value for the parameter is supplied from a real host variable in the EXECUTE statement. Named parameters are a real convenience when you use dynamic statements with a variable number of parameters.
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The DESCRIBE Statement
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The Oracle DESCRIBE statement is used, like the DB2 DESCRIBE statement, to describe the query results of a dynamic query. Like DB2, Oracle returns the descriptions in a SQLDA. The Oracle DESCRIBE statement can also be used to request a description of the named parameters in a dynamically prepared statement. Oracle also returns these parameter descriptions in a SQLDA. This Oracle DESCRIBE statement requests a description of the columns of query results from a previously prepared dynamic query:
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exec sql describe select list for qrystmt into qry_sqlda;
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PART V
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It corresponds to the DB2 statement:
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This Oracle DESCRIBE statement requests a description of the named parameters in a previously prepared dynamic statement. The statement might be a query or some other SQL statement:
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exec sql describe bind variables for thestmt into the_sqlda;
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Part V:
Programming with SQL
This Oracle statement has no DB2 equivalent. Following this DESCRIBE statement, your program would typically examine the information in the SQLDA, fill in the pointers in the SQLDA to point to the parameter values the program wants to supply, and then execute the statement using the SQLDA form of the OPEN or EXECUTE statement:
exec sql execute thestmt using descriptor the_sqlda; exec sql open qrycursor using descriptor the_sqlda;
The information returned by both forms of the Oracle DESCRIBE statement is the same and is described in the next section.
The Oracle SQLDA
The Oracle SQLDA performs the same functions as the DB2 SQLDA, but its format, shown in Figure 18-16, differs substantially from that of DB2. The two important fields in the DB2 SQLDA header both have counterparts in the Oracle SQLDA: The N field in the Oracle SQLDA specifies the size of the arrays used to hold column definitions. It corresponds to the SQLN field in the DB2 SQLDA. The F field in the Oracle SQLDA indicates how many columns are currently described in the arrays of the SQLDA. It corresponds to the SQLD field in the DB2 SQLDA. Instead of DB2 s single array of SQLVAR structures that contain column descriptions, the Oracle SQLDA contains pointers to a series of arrays, each of which describes one aspect of a column: The T field points to an array of integers that specify the data type for each query results column or named parameter. The integers in this array correspond to the SQLTYPE field in each DB2 SQLVAR structure. The V field points to an array of pointers that specify the buffer for each column of query results or each passed parameter value. The pointers in this array correspond to the SQLDATA field in each DB2 SQLVAR structure.
struct sqlda { long N; char **V; long *L; short *T; short **I; long F; char **S; short *M; short *C; char **X; short *Y; short *Z; } ;
/* /* /* /* /* /* /* /* /* /* /* /*
number of entries in the SQLDA arrays */ pointer to array of pointers to data areas */ pointer to array of buffer lengths */ pointer to array of data type codes */ pointer to array of pointers to indicator variables */ number of active entries in the SQLDA arrays */ pointer to array of pointers to column/parameter names */ pointer to array of name buffer lengths */ pointer to array of current lengths of names */ pointer to array of pointers to indicator parameter names */ pointer to array of indicator name buffer lengths */ pointer to array of current lengths of indicator names */
FIGURE 18-16
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