diff options
Diffstat (limited to 'innobase/rem/rem0rec.c')
| -rw-r--r-- | innobase/rem/rem0rec.c | 67 |
1 files changed, 64 insertions, 3 deletions
diff --git a/innobase/rem/rem0rec.c b/innobase/rem/rem0rec.c index 9ddfe7a4b9a..88009f2f5c9 100644 --- a/innobase/rem/rem0rec.c +++ b/innobase/rem/rem0rec.c @@ -1,7 +1,7 @@ /************************************************************************ Record manager -(c) 1994-1996 Innobase Oy +(c) 1994-2001 Innobase Oy Created 5/30/1994 Heikki Tuuri *************************************************************************/ @@ -12,6 +12,9 @@ Created 5/30/1994 Heikki Tuuri #include "rem0rec.ic" #endif +#include "mtr0mtr.h" +#include "mtr0log.h" + /* PHYSICAL RECORD =============== @@ -21,7 +24,10 @@ found in index pages of the database, has the following format represented on a higher text line): | offset of the end of the last field of data, the most significant - bit is set to 1 if and only if the field is SQL-null | + bit is set to 1 if and only if the field is SQL-null, + if the offset is 2-byte, then the second most significant + bit is set to 1 if the field is stored on another page: + mostly this will occur in the case of big BLOB fields | ... | offset of the end of the first field of data + the SQL-null bit | | 4 bits used to delete mark a record, and mark a predefined @@ -122,7 +128,8 @@ rec_get_nth_field( return(rec + os); } - next_os = next_os & ~REC_2BYTE_SQL_NULL_MASK; + next_os = next_os & ~(REC_2BYTE_SQL_NULL_MASK + | REC_2BYTE_EXTERN_MASK); } *len = next_os - os; @@ -170,6 +177,60 @@ rec_set_nth_field_null_bit( rec_2_set_field_end_info(rec, i, info); } +/*************************************************************** +Sets the value of the ith field extern storage bit. */ + +void +rec_set_nth_field_extern_bit( +/*=========================*/ + rec_t* rec, /* in: record */ + ulint i, /* in: ith field */ + ibool val, /* in: value to set */ + mtr_t* mtr) /* in: mtr holding an X-latch to the page where + rec is, or NULL; in the NULL case we do not + write to log about the change */ +{ + ulint info; + + ut_a(!rec_get_1byte_offs_flag(rec)); + ut_a(i < rec_get_n_fields(rec)); + + info = rec_2_get_field_end_info(rec, i); + + if (val) { + info = info | REC_2BYTE_EXTERN_MASK; + } else { + info = info & ~REC_2BYTE_EXTERN_MASK; + } + + if (mtr) { + mlog_write_ulint(rec - REC_N_EXTRA_BYTES - 2 * (i + 1), info, + MLOG_2BYTES, mtr); + } else { + rec_2_set_field_end_info(rec, i, info); + } +} + +/*************************************************************** +Sets TRUE the extern storage bits of fields mentioned in an array. */ + +void +rec_set_field_extern_bits( +/*======================*/ + rec_t* rec, /* in: record */ + ulint* vec, /* in: array of field numbers */ + ulint n_fields, /* in: number of fields numbers */ + mtr_t* mtr) /* in: mtr holding an X-latch to the page + where rec is, or NULL; in the NULL case we + do not write to log about the change */ +{ + ulint i; + + for (i = 0; i < n_fields; i++) { + rec_set_nth_field_extern_bit(rec, vec[i], TRUE, mtr); + } +} + /*************************************************************** Sets a record field to SQL null. The physical size of the field is not changed. */ |