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  • Committer: Andrew Hutchings
  • Date: 2011-02-01 10:23:22 UTC
  • mto: (2136.1.1 build)
  • mto: This revision was merged to the branch mainline in revision 2137.
  • Revision ID: andrew@linuxjedi.co.uk-20110201102322-oxztcyrjzg3c7yta
Fix counters cleanup

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drizzled/stored_key.h
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#pragma once
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#include <drizzled/memory/sql_alloc.h>
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#include <drizzled/copy_field.h>
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#include <drizzled/item.h>
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namespace drizzled {
 
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#ifndef DRIZZLED_STORED_KEY_H
 
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#define DRIZZLED_STORED_KEY_H
 
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namespace drizzled
 
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{
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/** class to store an field/item as a key struct */
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class StoredKey :public memory::SqlAlloc
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    STORE_KEY_FATAL, 
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    STORE_KEY_CONV 
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  };
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protected:
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  Field *to_field;                              // Store data here
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  unsigned char *null_ptr;
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  unsigned char err;
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  virtual enum store_key_result copy_inner()=0;
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public:
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  StoredKey(Session *session,
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            Field *field_arg, 
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            unsigned char *ptr,
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            unsigned char *null, 
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            uint32_t length);
 
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            uint32_t length)
 
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    :
 
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      null_key(0), 
 
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      null_ptr(null), 
 
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      err(0)
 
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  {
 
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    if (field_arg->type() == DRIZZLE_TYPE_BLOB)
 
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    {
 
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      /*
 
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        Key segments are always packed with a 2 byte length prefix.
 
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        See mi_rkey for details.
 
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      */
 
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      to_field= new Field_varstring(ptr,
 
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                                    length,
 
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                                    2,
 
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                                    null,
 
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                                    1,
 
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                                    field_arg->field_name,
 
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                                    field_arg->charset());
 
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      to_field->init(field_arg->getTable());
 
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    }
 
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    else
 
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      to_field= field_arg->new_key_field(session->mem_root, field_arg->getTable(),
 
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                                        ptr, null, 1);
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    to_field->setWriteSet();
 
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  }
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  virtual ~StoredKey() {}                       /** Not actually needed */
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  virtual const char *name() const=0;
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    @details this function makes sure truncation warnings when preparing the
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    key buffers don't end up as errors (because of an enclosing INSERT/UPDATE).
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  */
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  enum store_key_result copy();
 
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  enum store_key_result copy()
 
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  {
 
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    enum store_key_result result;
 
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    Session *session= to_field->getTable()->in_use;
 
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    enum_check_fields saved_count_cuted_fields= session->count_cuted_fields;
 
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    session->count_cuted_fields= CHECK_FIELD_IGNORE;
 
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    result= copy_inner();
 
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    session->count_cuted_fields= saved_count_cuted_fields;
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    return result;
 
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  }
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};
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class store_key_field: public StoredKey
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{
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  CopyField copy_field;
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  const char *field_name;
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public:
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  store_key_field(Session *session, Field *to_field_arg, unsigned char *ptr,
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                  unsigned char *null_ptr_arg,
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                  uint32_t length, Field *from_field, const char *name_arg) :
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    StoredKey(session, to_field_arg,ptr,
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              null_ptr_arg ? null_ptr_arg : from_field->maybe_null() ? &err
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              : (unsigned char*) 0, length), field_name(name_arg)
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    {
 
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                  uint32_t length, Field *from_field, const char *name_arg)
 
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    :StoredKey(session, to_field_arg,ptr,
 
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               null_ptr_arg ? null_ptr_arg : from_field->maybe_null() ? &err
 
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               : (unsigned char*) 0, length), field_name(name_arg)
 
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  {
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    if (to_field)
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    {
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      copy_field.set(to_field,from_field,0);
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class store_key_item :public StoredKey
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{
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protected:
 
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 protected:
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  Item *item;
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public:
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  store_key_item(Session *session, Field *to_field_arg, unsigned char *ptr,
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                 unsigned char *null_ptr_arg, uint32_t length, Item *item_arg) :
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    StoredKey(session, to_field_arg, ptr,
 
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                 unsigned char *null_ptr_arg, uint32_t length, Item *item_arg)
 
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    :StoredKey(session, to_field_arg, ptr,
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               null_ptr_arg ? null_ptr_arg : item_arg->maybe_null ?
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               &err : (unsigned char*) 0, length), item(item_arg)
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  {}
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class store_key_const_item :public store_key_item
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{
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  bool inited;
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public:
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  store_key_const_item(Session *session, Field *to_field_arg, unsigned char *ptr,
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                       unsigned char *null_ptr_arg, uint32_t length,
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                       Item *item_arg) :
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    store_key_item(session, to_field_arg,ptr,
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                   null_ptr_arg ? null_ptr_arg : item_arg->maybe_null ?
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                   &err : (unsigned char*) 0, length, item_arg), inited(0)
 
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                       unsigned char *null_ptr_arg, uint32_t length,
 
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                       Item *item_arg)
 
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    :store_key_item(session, to_field_arg,ptr,
 
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                    null_ptr_arg ? null_ptr_arg : item_arg->maybe_null ?
 
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                    &err : (unsigned char*) 0, length, item_arg), inited(0)
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  {
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  }
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  const char *name() const { return "const"; }
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} /* namespace drizzled */
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#endif /* DRIZZLED_STORED_KEY_H */