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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems, Inc.
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* Copyright (C) 2008 Sun Microsystems
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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#ifndef DRIZZLED_STORED_KEY_H
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#define DRIZZLED_STORED_KEY_H
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#include <drizzled/memory/sql_alloc.h>
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#include <drizzled/copy_field.h>
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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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Field *to_field; // Store data here
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unsigned char *null_ptr;
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virtual enum store_key_result copy_inner()=0;
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StoredKey(Session *session,
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unsigned char *ptr,
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unsigned char *null,
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if (field_arg->type() == DRIZZLE_TYPE_BLOB)
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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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to_field= new Field_varstring(ptr,
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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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to_field= field_arg->new_key_field(session->mem_root, field_arg->getTable(),
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to_field->setWriteSet();
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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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enum store_key_result copy();
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enum store_key_result copy()
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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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session->count_cuted_fields= saved_count_cuted_fields;
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class store_key_field: public StoredKey
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CopyField copy_field;
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const char *field_name;
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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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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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copy_field.set(to_field,from_field,0);
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class store_key_item :public StoredKey
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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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class store_key_const_item :public store_key_item
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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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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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: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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const char *name() const { return "const"; }