Drizzled Public API Documentation

btr_pcur_struct Struct Reference

Public Attributes

btr_cur_t btr_cur
ulint latch_mode
ulint old_stored
rec_t * old_rec
ulint old_n_fields
ulint rel_pos
buf_block_tblock_when_stored
ib_uint64_t modify_clock
ulint pos_state
ulint search_mode
trx_ttrx_if_known
mtr_tmtr
byte * old_rec_buf
ulint buf_size

Detailed Description

Definition at line 471 of file btr0pcur.h.

Member Data Documentation

btr_cur_t btr_pcur_struct::btr_cur

a B-tree cursor

Definition at line 472 of file btr0pcur.h.

Referenced by btr_pcur_create_for_mysql(), btr_pcur_free_for_mysql(), and row_update_for_mysql().

ulint btr_pcur_struct::buf_size

old_rec_buf size if old_rec_buf is not NULL

Definition at line 518 of file btr0pcur.h.

Referenced by btr_pcur_copy_stored_position(), and btr_pcur_store_position().

ulint btr_pcur_struct::latch_mode

see TODO note below! BTR_SEARCH_LEAF, BTR_MODIFY_LEAF, BTR_MODIFY_TREE, or BTR_NO_LATCHES, depending on the latching state of the page and tree where the cursor is positioned; the last value means that the cursor is not currently positioned: we say then that the cursor is detached; it can be restored to attached if the old position was stored in old_rec

Definition at line 473 of file btr0pcur.h.

Referenced by btr_pcur_free_for_mysql(), btr_pcur_move_backward_from_page(), btr_pcur_move_to_next_page(), btr_pcur_move_to_prev(), btr_pcur_release_leaf(), btr_pcur_restore_position_func(), and btr_pcur_store_position().

ib_uint64_t btr_pcur_struct::modify_clock

the modify clock value of the buffer block when the cursor position was stored

Definition at line 497 of file btr0pcur.h.

Referenced by btr_pcur_restore_position_func(), and btr_pcur_store_position().

mtr_t* btr_pcur_struct::mtr

NULL, or this field may contain a mini-transaction which holds the latch on the cursor page

Definition at line 513 of file btr0pcur.h.

ulint btr_pcur_struct::old_n_fields

number of fields in old_rec

Definition at line 490 of file btr0pcur.h.

Referenced by btr_pcur_copy_stored_position(), btr_pcur_free_for_mysql(), btr_pcur_restore_position_func(), and btr_pcur_store_position().

rec_t* btr_pcur_struct::old_rec

if cursor position is stored, contains an initial segment of the latest record cursor was positioned either on, before, or after

Definition at line 486 of file btr0pcur.h.

Referenced by btr_pcur_copy_stored_position(), btr_pcur_free_for_mysql(), btr_pcur_restore_position_func(), and btr_pcur_store_position().

byte* btr_pcur_struct::old_rec_buf

NULL, or a dynamically allocated buffer for old_rec

Definition at line 516 of file btr0pcur.h.

Referenced by btr_pcur_copy_stored_position(), btr_pcur_free_for_mysql(), and btr_pcur_store_position().

ulint btr_pcur_struct::old_stored
ulint btr_pcur_struct::pos_state

see TODO note below! BTR_PCUR_IS_POSITIONED, BTR_PCUR_WAS_POSITIONED, BTR_PCUR_NOT_POSITIONED

Definition at line 500 of file btr0pcur.h.

Referenced by btr_pcur_free_for_mysql(), btr_pcur_move_backward_from_page(), btr_pcur_move_to_next_page(), btr_pcur_move_to_prev(), btr_pcur_release_leaf(), btr_pcur_restore_position_func(), and btr_pcur_store_position().

ulint btr_pcur_struct::rel_pos

BTR_PCUR_ON, BTR_PCUR_BEFORE, or BTR_PCUR_AFTER, depending on whether cursor was on, before, or after the old_rec record

Definition at line 491 of file btr0pcur.h.

Referenced by btr_pcur_restore_position_func(), btr_pcur_store_position(), and row_update_for_mysql().

ulint btr_pcur_struct::search_mode

PAGE_CUR_G, ...

Definition at line 504 of file btr0pcur.h.

Referenced by btr_pcur_restore_position_func(), and row_search_for_mysql().

trx_t* btr_pcur_struct::trx_if_known

the transaction, if we know it; otherwise this field is not defined; can ONLY BE USED in error prints in fatal assertion failures!

Definition at line 505 of file btr0pcur.h.

Referenced by btr_pcur_restore_position_func(), and row_search_for_mysql().


The documentation for this struct was generated from the following file: