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Merge InnoDB-4.0.14: SAVEPOINT now implemented; InnoDB now accepts also column prefix keys; crashing bug in ON UPDATE CASCADE fixed; page checksum formula fixed
177 lines
6.3 KiB
C
177 lines
6.3 KiB
C
/***********************************************************************
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Comparison services for records
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(c) 1994-2001 Innobase Oy
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Created 7/1/1994 Heikki Tuuri
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************************************************************************/
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#ifndef rem0cmp_h
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#define rem0cmp_h
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#include "univ.i"
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#include "data0data.h"
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#include "data0type.h"
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#include "dict0dict.h"
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#include "rem0rec.h"
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/*****************************************************************
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Returns TRUE if two types are equal for comparison purposes. */
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ibool
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cmp_types_are_equal(
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/*================*/
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/* out: TRUE if the types are considered
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equal in comparisons */
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dtype_t* type1, /* in: type 1 */
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dtype_t* type2); /* in: type 2 */
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/*****************************************************************
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This function is used to compare two data fields for which we know the
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data type. */
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UNIV_INLINE
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int
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cmp_data_data(
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/*==========*/
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/* out: 1, 0, -1, if data1 is greater, equal,
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less than data2, respectively */
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dtype_t* cur_type,/* in: data type of the fields */
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byte* data1, /* in: data field (== a pointer to a memory
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buffer) */
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ulint len1, /* in: data field length or UNIV_SQL_NULL */
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byte* data2, /* in: data field (== a pointer to a memory
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buffer) */
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ulint len2); /* in: data field length or UNIV_SQL_NULL */
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/*****************************************************************
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This function is used to compare two data fields for which we know the
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data type. */
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int
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cmp_data_data_slow(
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/*===============*/
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/* out: 1, 0, -1, if data1 is greater, equal,
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less than data2, respectively */
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dtype_t* cur_type,/* in: data type of the fields */
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byte* data1, /* in: data field (== a pointer to a memory
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buffer) */
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ulint len1, /* in: data field length or UNIV_SQL_NULL */
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byte* data2, /* in: data field (== a pointer to a memory
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buffer) */
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ulint len2); /* in: data field length or UNIV_SQL_NULL */
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/*****************************************************************
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This function is used to compare two dfields where at least the first
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has its data type field set. */
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UNIV_INLINE
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int
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cmp_dfield_dfield(
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/*==============*/
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/* out: 1, 0, -1, if dfield1 is greater, equal,
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less than dfield2, respectively */
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dfield_t* dfield1,/* in: data field; must have type field set */
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dfield_t* dfield2);/* in: data field */
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/*****************************************************************
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This function is used to compare a data tuple to a physical record.
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Only dtuple->n_fields_cmp first fields are taken into account for
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the the data tuple! If we denote by n = n_fields_cmp, then rec must
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have either m >= n fields, or it must differ from dtuple in some of
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the m fields rec has. If rec has an externally stored field we do not
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compare it but return with value 0 if such a comparison should be
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made. */
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int
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cmp_dtuple_rec_with_match(
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/*======================*/
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/* out: 1, 0, -1, if dtuple is greater, equal,
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less than rec, respectively, when only the
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common first fields are compared, or
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until the first externally stored field in
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rec */
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dtuple_t* dtuple, /* in: data tuple */
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rec_t* rec, /* in: physical record which differs from
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dtuple in some of the common fields, or which
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has an equal number or more fields than
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dtuple */
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ulint* matched_fields, /* in/out: number of already completely
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matched fields; when function returns,
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contains the value for current comparison */
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ulint* matched_bytes); /* in/out: number of already matched
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bytes within the first field not completely
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matched; when function returns, contains the
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value for current comparison */
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/******************************************************************
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Compares a data tuple to a physical record. */
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int
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cmp_dtuple_rec(
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/*===========*/
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/* out: 1, 0, -1, if dtuple is greater, equal,
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less than rec, respectively; see the comments
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for cmp_dtuple_rec_with_match */
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dtuple_t* dtuple, /* in: data tuple */
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rec_t* rec); /* in: physical record */
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/******************************************************************
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Checks if a dtuple is a prefix of a record. The last field in dtuple
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is allowed to be a prefix of the corresponding field in the record. */
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ibool
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cmp_dtuple_is_prefix_of_rec(
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/*========================*/
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/* out: TRUE if prefix */
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dtuple_t* dtuple, /* in: data tuple */
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rec_t* rec); /* in: physical record */
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/******************************************************************
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Compares a prefix of a data tuple to a prefix of a physical record for
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equality. If there are less fields in rec than parameter n_fields, FALSE
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is returned. NOTE that n_fields_cmp of dtuple does not affect this
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comparison. */
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ibool
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cmp_dtuple_rec_prefix_equal(
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/*========================*/
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/* out: TRUE if equal */
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dtuple_t* dtuple, /* in: data tuple */
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rec_t* rec, /* in: physical record */
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ulint n_fields); /* in: number of fields which should be
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compared; must not exceed the number of
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fields in dtuple */
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/*****************************************************************
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This function is used to compare two physical records. Only the common
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first fields are compared, and if an externally stored field is
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encountered, then 0 is returned. */
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int
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cmp_rec_rec_with_match(
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/*===================*/
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/* out: 1, 0 , -1 if rec1 is greater, equal,
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less, respectively, than rec2; only the common
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first fields are compared */
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rec_t* rec1, /* in: physical record */
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rec_t* rec2, /* in: physical record */
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dict_index_t* index, /* in: data dictionary index */
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ulint* matched_fields, /* in/out: number of already completely
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matched fields; when the function returns,
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contains the value the for current
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comparison */
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ulint* matched_bytes);/* in/out: number of already matched
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bytes within the first field not completely
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matched; when the function returns, contains
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the value for the current comparison */
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/*****************************************************************
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This function is used to compare two physical records. Only the common
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first fields are compared. */
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UNIV_INLINE
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int
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cmp_rec_rec(
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/*========*/
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/* out: 1, 0 , -1 if rec1 is greater, equal,
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less, respectively, than rec2; only the common
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first fields are compared */
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rec_t* rec1, /* in: physical record */
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rec_t* rec2, /* in: physical record */
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dict_index_t* index); /* in: data dictionary index */
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#ifndef UNIV_NONINL
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#include "rem0cmp.ic"
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#endif
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#endif
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