1 karl  1.4 //%2003////////////////////////////////////////////////////////////////////////

  2 mike  1.2 //

  3 karl  1.4 // Copyright (c) 2000, 2001, 2002  BMC Software, Hewlett-Packard Development
  4           // Company, L. P., IBM Corp., The Open Group, Tivoli Systems.
  5           // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L. P.;
  6           // IBM Corp.; EMC Corporation, The Open Group.

  7 mike  1.2 //
  8           // Permission is hereby granted, free of charge, to any person obtaining a copy

  9 kumpf 1.3 // of this software and associated documentation files (the "Software"), to
 10           // deal in the Software without restriction, including without limitation the
 11           // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 12 mike  1.2 // sell copies of the Software, and to permit persons to whom the Software is
 13           // furnished to do so, subject to the following conditions:
 14           // 

 15 kumpf 1.3 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN

 16 mike  1.2 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
 17           // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT

 18 kumpf 1.3 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 19           // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 20           // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 21 mike  1.2 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 22           // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 23           //
 24           //==============================================================================
 25           //
 26           // Author: Mike Brasher (mbrasher@bmc.com)
 27           //
 28           // Modified By:
 29           //
 30           //%/////////////////////////////////////////////////////////////////////////////
 31           
 32           #ifndef Pegasus_WQLOperation_h
 33           #define Pegasus_WQLOperation_h
 34           
 35           #include <Pegasus/Common/Config.h>
 36           #include <Pegasus/WQL/Linkage.h>
 37           
 38           PEGASUS_NAMESPACE_BEGIN
 39           
 40           /** Represents SQL where clause operators.
 41           
 42 mike  1.2     These operators include the following:
 43           
 44               <ul>
 45           	<li>OR</li>
 46           	<li>AND</li>
 47           	<li>NOT</li>
 48           	<li>=</li>
 49           	<li>&lt;&gt;</li>
 50           	<li>&lt;</li>
 51           	<li>&le;</li>
 52           	<li>&gt;</li>
 53           	<li>&ge;</li>
 54           	<li>IS NULL</li>
 55           	<li>IS NOT NULL</li>
 56           	<li>IS TRUE</li>
 57           	<li>IS NOT TRUE</li>
 58           	<li>IS FALSE</li>
 59           	<li>IS NOT FALSE</li>
 60               </ul>
 61           
 62               Here's an example of a SQL query that uses some of these operations.
 63 mike  1.2 
 64               <pre>
 65           	SELECT *
 66           	FROM MyClass
 67           	WHERE (x &gt; 10 OR y &le; 1.5) OR z = 19 AND name IS NOT NULL
 68               </pre>
 69           
 70               As the parser recognizes these operations, it adds the corresponding
 71               WQLOperation enumeration tag to the WQLSelectStatement by calling
 72               WQLSelectStatement::appendOperation().
 73           
 74               Operators may be converted to string by calling WQLOperationToString().
 75           
 76               Note that in expressions like this one:
 77           
 78               <pre>
 79           	count IS TRUE
 80               </pre>
 81           
 82               The IS operator is NOT treated as a binary operator (which would take
 83               count and TRUE as its operands). Instead, the IS operator and TRUE operand
 84 mike  1.2     are combined to form a single unary operation called "IS_TRUE". In this 
 85               way, evaluation may be implemented by more efficiently (the TRUE operand
 86               is eliminated and therefore need not be handled). Conceptually, the above
 87               expression is equivalent to the following psuedo expression:
 88           
 89               <pre>
 90               	IS_TRUE(count)
 91               </pre>
 92           
 93               Note that this technique is applied the following operations (also 
 94               combined to be unary operations).
 95           
 96               <ul>
 97           	<li>WQL_IS_NULL</li>
 98           	<li>WQL_IS_NOT_NULL</li>
 99           	<li>WQL_IS_TRUE</li>
100           	<li>WQL_IS_NOT_TRUE</li>
101           	<li>WQL_IS_FALSE</li>
102           	<li>WQL_IS_NOT_FALSE</li>
103               </ul>
104           */
105 mike  1.2 enum WQLOperation
106           {
107               WQL_OR,
108               WQL_AND,
109               WQL_NOT,
110               WQL_EQ,
111               WQL_NE,
112               WQL_LT,
113               WQL_LE,
114               WQL_GT,
115               WQL_GE,
116               WQL_IS_NULL,
117               WQL_IS_NOT_NULL,
118               WQL_IS_TRUE,
119               WQL_IS_NOT_TRUE,
120               WQL_IS_FALSE,
121               WQL_IS_NOT_FALSE
122           };
123           
124           PEGASUS_WQL_LINKAGE const char* WQLOperationToString(WQLOperation x);
125           
126 mike  1.2 PEGASUS_NAMESPACE_END
127           
128           #endif /* Pegasus_WQLOperation_h */