SourcePro C++ 12.0 |
SourcePro® C++ API Reference Guide |
SourcePro C++ Documentation Home |
Represents the result of applying logical operators to RWDBExpr. It is used to encapsulate SQL WHERE
clauses.
More...
#include <rw/db/expr.h>
Public Member Functions | |
RWDBCriterion (void) |
RWDBCriterion is the result of applying logical operators to RWDBExpr. It is used to encapsulate SQL WHERE
clauses.
RWDBCriterion represents a specialized type of RWDBExpr that is evaluated in an SQL statement as a boolean value. RWDBCriterion adds neither components nor member functions to the base class. Instead, it ensures that a nonboolean expression is not placed in a context that requires a boolean expression during compilation.
#include <rw/db/expr.h>
RWDBCriterion is a special case of RWDBExpr. Please see RWDBExpr for details about RWDBCriterion usage, including operators and constructors.
In this example, an RWDBCriterion is created anonymously to be used as part of an SQL WHERE
clause:
int x = somevalue; RWDBSelector select = myDbase.selector(); select.where(myTable["myColumn"] != x);
RWDBCriterion::RWDBCriterion | ( | void | ) |
The default constructor creates an empty criterion.
© Copyright Rogue Wave Software, Inc. All Rights Reserved.
Rogue Wave and SourcePro are registered trademarks of Rogue Wave Software, Inc. in the United States and other countries. All other trademarks are the property of their respective owners.
Contact Rogue Wave about documentation or support issues.