ndbscanfilter.hpp

在AS4下编译通过

/* Copyright (C) 2003 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#ifndef NDB_SCAN_FILTER_HPP
#define NDB_SCAN_FILTER_HPP

#include <ndb_types.h>
#include <ndbapi_limits.h>

/**
 * @class NdbScanFilter
 * @brief A simple way to specify filters for scan operations
 *
 * @note  This filter interface is under development and may change in 
 *        the future! 
 * 
 */
class NdbScanFilter {
public:
  /**
   * Constructor
   * @param op  The NdbOperation that the filter belongs to (is applied to).
   * @param abort_on_too_large  abort transaction on filter too large
   *                            default: true
   * @param max_size  Maximum size of generated filter in words
   */
  NdbScanFilter(class NdbOperation * op,
                bool abort_on_too_large = true,
                Uint32 max_size = NDB_MAX_SCANFILTER_SIZE_IN_WORDS);
  ~NdbScanFilter();
  
  /**
   *  Group operators
   */
  enum Group {
    AND  = 1,    ///< (x1 AND x2 AND x3)
    OR   = 2,    ///< (x1 OR x2 OR X3)
    NAND = 3,    ///< NOT (x1 AND x2 AND x3)
    NOR  = 4     ///< NOT (x1 OR x2 OR x3)
  };

  enum BinaryCondition 
  {
    COND_LE = 0,        ///< lower bound
    COND_LT = 1,        ///< lower bound, strict
    COND_GE = 2,        ///< upper bound
    COND_GT = 3,        ///< upper bound, strict
    COND_EQ = 4,        ///< equality
    COND_NE = 5,        ///< not equal
    COND_LIKE = 6,      ///< like
    COND_NOT_LIKE = 7   ///< not like
  };

  /** 
   * @name Grouping
   * @{
   */

  /**
   *  Begin of compound.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int begin(Group group = AND);    

  /**
   *  End of compound.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int end();

  /** @} *********************************************************************/

  /**
   *  <i>Explanation missing</i>
   */
  int istrue();

  /**
   *  <i>Explanation missing</i>
   */
  int isfalse();

  /**
   * Compare column <b>ColId</b> with <b>val</b>
   */
  int cmp(BinaryCondition cond, int ColId, const void *val, Uint32 len = 0); 

  /** 
   * @name Integer Comparators
   * @{
   */
  /** Compare column value with integer for equal   
   *  畆eturn  0 if successful, -1 otherwize
   */
  int eq(int ColId, Uint32 value) { return cmp(COND_EQ, ColId, &value, 4);}

  /** Compare column value with integer for not equal.
   *  畆eturn  0 if successful, -1 otherwize 
   */
  int ne(int ColId, Uint32 value) { return cmp(COND_NE, ColId, &value, 4);}  
  /** Compare column value with integer for less than.
   *  畆eturn  0 if successful, -1 otherwize 
   */
  int lt(int ColId, Uint32 value) { return cmp(COND_LT, ColId, &value, 4);}
  /** Compare column value with integer for less than or equal. 
   *  畆eturn  0 if successful, -1 otherwize
   */
  int le(int ColId, Uint32 value) { return cmp(COND_LE, ColId, &value, 4);}
  /** Compare column value with integer for greater than. 
   *  畆eturn  0 if successful, -1 otherwize
   */
  int gt(int ColId, Uint32 value) { return cmp(COND_GT, ColId, &value, 4);} 
  /** Compare column value with integer for greater than or equal.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int ge(int ColId, Uint32 value) { return cmp(COND_GE, ColId, &value, 4);}

  /** Compare column value with integer for equal. 64-bit.  
   *  畆eturn  0 if successful, -1 otherwize
   */
  int eq(int ColId, Uint64 value) { return cmp(COND_EQ, ColId, &value, 8);}
  /** Compare column value with integer for not equal. 64-bit.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int ne(int ColId, Uint64 value) { return cmp(COND_NE, ColId, &value, 8);}
  /** Compare column value with integer for less than. 64-bit.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int lt(int ColId, Uint64 value) { return cmp(COND_LT, ColId, &value, 8);}  
  /** Compare column value with integer for less than or equal. 64-bit.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int le(int ColId, Uint64 value) { return cmp(COND_LE, ColId, &value, 8);}
  /** Compare column value with integer for greater than. 64-bit.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int gt(int ColId, Uint64 value) { return cmp(COND_GT, ColId, &value, 8);}
  /** Compare column value with integer for greater than or equal. 64-bit.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int ge(int ColId, Uint64 value) { return cmp(COND_GE, ColId, &value, 8);}
  /** @} *********************************************************************/

  /** Check if column value is NULL */
  int isnull(int ColId);             
  /** Check if column value is non-NULL */
  int isnotnull(int ColId);          
  
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  /**
   *  Like comparison operator.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int like(int ColId, const char * val, Uint32 len, bool nopad=false);
  /**
   *  Notlike comparison operator.
   *  畆eturn  0 if successful, -1 otherwize
   */
  int notlike(int ColId, const char * val, Uint32 len, bool nopad=false);
  /** @} *********************************************************************/
#endif

  enum Error {
    FilterTooLarge = 4294
  };

  /**
   * Get filter level error.
   *
   * Most errors are set only on operation level, and they abort the
   * transaction.  The error FilterTooLarge is set on filter level and
   * by default it propagates to operation level and also aborts the
   * transaction.
   *
   * If option abort_on_too_large is set to false, then FilterTooLarge
   * does not propagate.  One can then either ignore this error (in
   * which case no filtering is done) or try to define a new filter
   * immediately.
   */
  const class NdbError & getNdbError() const;

private:
#ifndef DOXYGEN_SHOULD_SKIP_INTERNAL
  friend class NdbScanFilterImpl;
#endif
  class NdbScanFilterImpl & m_impl;
  NdbScanFilter& operator=(const NdbScanFilter&); ///< Defined not implemented
};

#endif