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  • Committer: Brian Aker
  • Date: 2009-10-02 21:34:26 UTC
  • mfrom: (1134.1.4 bug426504)
  • Revision ID: brian@gaz-20091002213426-7ojknrpknoedaprl
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drizzled/cached_item.cc
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  Buffers to save and compare item values
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*/
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#include "config.h"
 
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#include <drizzled/server_includes.h>
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#include <drizzled/cached_item.h>
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#include <drizzled/sql_string.h>
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#include <drizzled/session.h>
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using namespace std;
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namespace drizzled
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{
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/**
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  Create right type of Cached_item for an item.
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*/
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Cached_item *new_Cached_item(Session *session, Item *item)
 
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Cached_item *new_Cached_item(Session *session, Item *item,
 
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                             bool use_result_field)
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{
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  if (item->real_item()->type() == Item::FIELD_ITEM &&
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      !(((Item_field *) (item->real_item()))->field->flags & BLOB_FLAG))
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  {
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    Item_field *real_item= (Item_field *) item->real_item();
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    Field *cached_field= real_item->field;
 
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    Field *cached_field= use_result_field ? real_item->result_field :
 
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                                            real_item->field;
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    return new Cached_item_field(cached_field);
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  }
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  switch (item->result_type()) {
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  case STRING_RESULT:
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    return new Cached_item_str(session, (Item_field *) item);
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  case DECIMAL_RESULT:
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    return new Cached_item_decimal(item);
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  case ROW_RESULT:
 
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  default:
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    assert(0);
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    return 0;
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  }
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  abort();
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}
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Cached_item::~Cached_item() {}
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}
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Cached_item_field::Cached_item_field(Field *arg_field) 
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  : 
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    field(arg_field)
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{
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  /* TODO: take the memory allocation below out of the constructor. */
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  buff= (unsigned char*) memory::sql_calloc(length= field->pack_length());
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}
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bool Cached_item_field::cmp(void)
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{
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  // This is not a blob!
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  bool tmp= field->cmp_internal(buff) != 0;
 
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  bool tmp= field->cmp(buff) != 0;
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  if (tmp)
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    field->get_image(buff,length,field->charset());
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  return false;
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}
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} /* namespace drizzled */
 
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