1 a.dunfey 1.6.16.1 //%2006////////////////////////////////////////////////////////////////////////

  2 mike     1.2      //

  3 karl     1.5      // 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 karl     1.4      // IBM Corp.; EMC Corporation, The Open Group.

  7 karl     1.5      // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
  8                   // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.

  9 karl     1.6      // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
 10                   // EMC Corporation; VERITAS Software Corporation; The Open Group.

 11 a.dunfey 1.6.16.1 // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
 12                   // EMC Corporation; Symantec Corporation; The Open Group.

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

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

 18 mike     1.2      // sell copies of the Software, and to permit persons to whom the Software is
 19                   // furnished to do so, subject to the following conditions:
 20                   // 

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

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

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

 27 mike     1.2      // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 28                   // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 29                   //
 30                   //==============================================================================
 31                   //
 32                   // Author: Mike Brasher (mbrasher@bmc.com)
 33                   //
 34                   // Modified By:
 35                   //
 36                   //%/////////////////////////////////////////////////////////////////////////////
 37                   
 38                   #ifndef Pegasus_WQLOperation_h
 39                   #define Pegasus_WQLOperation_h
 40                   
 41                   #include <Pegasus/Common/Config.h>
 42                   #include <Pegasus/WQL/Linkage.h>
 43                   
 44                   PEGASUS_NAMESPACE_BEGIN
 45                   
 46                   /** Represents SQL where clause operators.
 47                   
 48 mike     1.2          These operators include the following:
 49                   
 50                       <ul>
 51                   	<li>OR</li>
 52                   	<li>AND</li>
 53                   	<li>NOT</li>
 54                   	<li>=</li>
 55                   	<li>&lt;&gt;</li>
 56                   	<li>&lt;</li>
 57                   	<li>&le;</li>
 58                   	<li>&gt;</li>
 59                   	<li>&ge;</li>
 60                   	<li>IS NULL</li>
 61                   	<li>IS NOT NULL</li>
 62                   	<li>IS TRUE</li>
 63                   	<li>IS NOT TRUE</li>
 64                   	<li>IS FALSE</li>
 65                   	<li>IS NOT FALSE</li>
 66                       </ul>
 67                   
 68                       Here's an example of a SQL query that uses some of these operations.
 69 mike     1.2      
 70                       <pre>
 71                   	SELECT *
 72                   	FROM MyClass
 73                   	WHERE (x &gt; 10 OR y &le; 1.5) OR z = 19 AND name IS NOT NULL
 74                       </pre>
 75                   
 76                       As the parser recognizes these operations, it adds the corresponding
 77                       WQLOperation enumeration tag to the WQLSelectStatement by calling
 78                       WQLSelectStatement::appendOperation().
 79                   
 80                       Operators may be converted to string by calling WQLOperationToString().
 81                   
 82                       Note that in expressions like this one:
 83                   
 84                       <pre>
 85                   	count IS TRUE
 86                       </pre>
 87                   
 88                       The IS operator is NOT treated as a binary operator (which would take
 89                       count and TRUE as its operands). Instead, the IS operator and TRUE operand
 90 mike     1.2          are combined to form a single unary operation called "IS_TRUE". In this 
 91                       way, evaluation may be implemented by more efficiently (the TRUE operand
 92                       is eliminated and therefore need not be handled). Conceptually, the above
 93                       expression is equivalent to the following psuedo expression:
 94                   
 95                       <pre>
 96                       	IS_TRUE(count)
 97                       </pre>
 98                   
 99                       Note that this technique is applied the following operations (also 
100                       combined to be unary operations).
101                   
102                       <ul>
103                   	<li>WQL_IS_NULL</li>
104                   	<li>WQL_IS_NOT_NULL</li>
105                   	<li>WQL_IS_TRUE</li>
106                   	<li>WQL_IS_NOT_TRUE</li>
107                   	<li>WQL_IS_FALSE</li>
108                   	<li>WQL_IS_NOT_FALSE</li>
109                       </ul>
110                   */
111 mike     1.2      enum WQLOperation
112                   {
113                       WQL_OR,
114                       WQL_AND,
115                       WQL_NOT,
116                       WQL_EQ,
117                       WQL_NE,
118                       WQL_LT,
119                       WQL_LE,
120                       WQL_GT,
121                       WQL_GE,
122                       WQL_IS_NULL,
123                       WQL_IS_NOT_NULL,
124                       WQL_IS_TRUE,
125                       WQL_IS_NOT_TRUE,
126                       WQL_IS_FALSE,
127                       WQL_IS_NOT_FALSE
128                   };
129                   
130                   PEGASUS_WQL_LINKAGE const char* WQLOperationToString(WQLOperation x);
131                   
132 mike     1.2      PEGASUS_NAMESPACE_END
133                   
134                   #endif /* Pegasus_WQLOperation_h */