/************************************************************************ Record manager (c) 1994-1996 Innobase Oy Created 5/30/1994 Heikki Tuuri *************************************************************************/ #ifndef rem0rec_h #define rem0rec_h #include "univ.i" #include "data0data.h" #include "rem0types.h" #include "mtr0types.h" /* Maximum values for various fields (for non-blob tuples) */ #define REC_MAX_N_FIELDS (1024 - 1) #define REC_MAX_HEAP_NO (2 * 8192 - 1) #define REC_MAX_N_OWNED (16 - 1) /* Flag denoting the predefined minimum record: this bit is ORed in the 4 info bits of a record */ #define REC_INFO_MIN_REC_FLAG 0x10UL /* Number of extra bytes in an old-style record, in addition to the data and the offsets */ #define REC_N_OLD_EXTRA_BYTES 6 /* Number of extra bytes in a new-style record, in addition to the data and the offsets */ #define REC_N_NEW_EXTRA_BYTES 5 /* Record status values */ #define REC_STATUS_ORDINARY 0 #define REC_STATUS_NODE_PTR 1 #define REC_STATUS_INFIMUM 2 #define REC_STATUS_SUPREMUM 3 /* Number of elements that should be initially allocated for the offsets[] array, first passed to rec_get_offsets() */ #define REC_OFFS_NORMAL_SIZE 100 #define REC_OFFS_SMALL_SIZE 10 /********************************************************** The following function is used to get the offset of the next chained record on the same page. */ UNIV_INLINE ulint rec_get_next_offs( /*==============*/ /* out: the page offset of the next chained record */ rec_t* rec, /* in: physical record */ ulint comp); /* in: nonzero=compact page format */ /********************************************************** The following function is used to set the next record offset field of the record. */ UNIV_INLINE void rec_set_next_offs( /*==============*/ rec_t* rec, /* in: physical record */ ulint comp, /* in: nonzero=compact page format */ ulint next); /* in: offset of the next record */ /********************************************************** The following function is used to get the number of fields in an old-style record. */ UNIV_INLINE ulint rec_get_n_fields_old( /*=================*/ /* out: number of data fields */ rec_t* rec); /* in: physical record */ /********************************************************** The following function is used to get the number of fields in a record. */ UNIV_INLINE ulint rec_get_n_fields( /*=============*/ /* out: number of data fields */ rec_t* rec, /* in: physical record */ dict_index_t* index); /* in: record descriptor */ /********************************************************** The following function is used to get the number of records owned by the previous directory record. */ UNIV_INLINE ulint rec_get_n_owned( /*============*/ /* out: number of owned records */ rec_t* rec, /* in: physical record */ ulint comp); /* in: nonzero=compact page format */ /********************************************************** The following function is used to set the number of owned records. */ UNIV_INLINE void rec_set_n_owned( /*============*/ rec_t* rec, /* in: physical record */ ulint comp, /* in: nonzero=compact page format */ ulint n_owned); /* in: the number of owned */ /********************************************************** The following function is used to retrieve the info bits of a record. */ UNIV_INLINE ulint rec_get_info_bits( /*==============*/ /* out: info bits */ rec_t* rec, /* in: physical record */ ulint comp); /* in: nonzero=compact page format */ /********************************************************** The following function is used to set the info bits of a record. */ UNIV_INLINE void rec_set_info_bits( /*==============*/ rec_t* rec, /* in: physical record */ ulint comp, /* in: nonzero=compact page format */ ulint bits); /* in: info bits */ /********************************************************** The following function retrieves the status bits of a new-style record. */ UNIV_INLINE ulint rec_get_status( /*===========*/ /* out: status bits */ rec_t* rec); /* in: physical record */ /********************************************************** The following function is used to set the status bits of a new-style record. */ UNIV_INLINE void rec_set_status( /*===========*/ rec_t* rec, /* in: physical record */ ulint bits); /* in: info bits */ /********************************************************** The following function is used to retrieve the info and status bits of a record. (Only compact records have status bits.) */ UNIV_INLINE ulint rec_get_info_and_status_bits( /*=========================*/ /* out: info bits */ rec_t* rec, /* in: physical record */ ulint comp); /* in: nonzero=compact page format */ /********************************************************** The following function is used to set the info and status bits of a record. (Only compact records have status bits.) */ UNIV_INLINE void rec_set_info_and_status_bits( /*=========================*/ rec_t* rec, /* in: physical record */ ulint comp, /* in: nonzero=compact page format */ ulint bits); /* in: info bits */ /********************************************************** The following function tells if record is delete marked. */ UNIV_INLINE ulint rec_get_deleted_flag( /*=================*/ /* out: nonzero if delete marked */ rec_t* rec, /* in: physical record */ ulint comp); /* in: nonzero=compact page format */ /********************************************************** The following function is used to set the deleted bit. */ UNIV_INLINE void rec_set_deleted_flag( /*=================*/ rec_t* rec, /* in: physical record */ ulint comp, /* in: nonzero=compact page format */ ulint flag); /* in: nonzero if delete marked */ /********************************************************** The following function tells if a new-style record is a node pointer. */ UNIV_INLINE ibool rec_get_node_ptr_flag( /*=================*/ /* out: TRUE if node pointer */ rec_t* rec); /* in: physical record */ /********************************************************** The following function is used to get the order number of the record in the heap of the index page. */ UNIV_INLINE ulint rec_get_heap_no( /*=============*/ /* out: heap order number */ rec_t* rec, /* in: physical record */ ulint comp); /* in: nonzero=compact page format */ /********************************************************** The following function is used to set the heap number field in the record. */ UNIV_INLINE void rec_set_heap_no( /*=============*/ rec_t* rec, /* in: physical record */ ulint comp, /* in: nonzero=compact page format */ ulint heap_no);/* in: the heap number */ /********************************************************** The following function is used to test whether the data offsets in the record are stored in one-byte or two-byte format. */ UNIV_INLINE ibool rec_get_1byte_offs_flag( /*====================*/ /* out: TRUE if 1-byte form */ rec_t* rec); /* in: physical record */ /********************************************************** The following function determines the offsets to each field in the record. It can reuse a previously allocated array. */ ulint* rec_get_offsets_func( /*=================*/ /* out: the new offsets */ rec_t* rec, /* in: physical record */ dict_index_t* index, /* in: record descriptor */ ulint* offsets,/* in: array consisting of offsets[0] allocated elements, or an array from rec_get_offsets(), or NULL */ ulint n_fields,/* in: maximum number of initialized fields (ULINT_UNDEFINED if all fields) */ mem_heap_t** heap, /* in/out: memory heap */ const char* file, /* in: file name where called */ ulint line); /* in: line number where called */ #define rec_get_offsets(rec,index,offsets,n,heap) \ rec_get_offsets_func(rec,index,offsets,n,heap,__FILE__,__LINE__) /**************************************************************** Validates offsets returned by rec_get_offsets(). */ UNIV_INLINE ibool rec_offs_validate( /*==============*/ /* out: TRUE if valid */ rec_t* rec, /* in: record or NULL */ dict_index_t* index, /* in: record descriptor or NULL */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /**************************************************************** Updates debug data in offsets, in order to avoid bogus rec_offs_validate() failures. */ UNIV_INLINE void rec_offs_make_valid( /*================*/ rec_t* rec, /* in: record */ dict_index_t* index,/* in: record descriptor */ ulint* offsets);/* in: array returned by rec_get_offsets() */ /**************************************************************** The following function is used to get a pointer to the nth data field in an old-style record. */ byte* rec_get_nth_field_old( /*==================*/ /* out: pointer to the field */ rec_t* rec, /* in: record */ ulint n, /* in: index of the field */ ulint* len); /* out: length of the field; UNIV_SQL_NULL if SQL null */ /**************************************************************** Gets the physical size of an old-style field. Also an SQL null may have a field of size > 0, if the data type is of a fixed size. */ UNIV_INLINE ulint rec_get_nth_field_size( /*===================*/ /* out: field size in bytes */ rec_t* rec, /* in: record */ ulint n); /* in: index of the field */ /**************************************************************** The following function is used to get a pointer to the nth data field in an old-style record. */ UNIV_INLINE byte* rec_get_nth_field( /*==============*/ /* out: pointer to the field */ rec_t* rec, /* in: record */ const ulint* offsets,/* in: array returned by rec_get_offsets() */ ulint n, /* in: index of the field */ ulint* len); /* out: length of the field; UNIV_SQL_NULL if SQL null */ /********************************************************** Determine if the offsets are for a record in the new compact format. */ UNIV_INLINE ulint rec_offs_comp( /*==========*/ /* out: TRUE if compact format */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /********************************************************** Returns TRUE if the nth field of rec is SQL NULL. */ UNIV_INLINE ibool rec_offs_nth_null( /*==============*/ /* out: TRUE if SQL NULL */ const ulint* offsets,/* in: array returned by rec_get_offsets() */ ulint n); /* in: nth field */ /********************************************************** Returns TRUE if the extern bit is set in nth field of rec. */ UNIV_INLINE ibool rec_offs_nth_extern( /*================*/ /* out: TRUE if externally stored */ const ulint* offsets,/* in: array returned by rec_get_offsets() */ ulint n); /* in: nth field */ /********************************************************** Gets the physical size of a field. */ UNIV_INLINE ulint rec_offs_nth_size( /*==============*/ /* out: length of field */ const ulint* offsets,/* in: array returned by rec_get_offsets() */ ulint n); /* in: nth field */ /********************************************************** Returns TRUE if the extern bit is set in any of the fields of rec. */ UNIV_INLINE ibool rec_offs_any_extern( /*================*/ /* out: TRUE if a field is stored externally */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /*************************************************************** Sets the value of the ith field extern storage bit. */ UNIV_INLINE void rec_set_nth_field_extern_bit( /*=========================*/ rec_t* rec, /* in: record */ dict_index_t* index, /* in: record descriptor */ 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 */ /*************************************************************** Sets TRUE the extern storage bits of fields mentioned in an array. */ void rec_set_field_extern_bits( /*======================*/ rec_t* rec, /* in: record */ dict_index_t* index, /* in: record descriptor */ const 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 */ /*************************************************************** This is used to modify the value of an already existing field in a record. The previous value must have exactly the same size as the new value. If len is UNIV_SQL_NULL then the field is treated as an SQL null for old-style records. For new-style records, len must not be UNIV_SQL_NULL. */ UNIV_INLINE void rec_set_nth_field( /*==============*/ rec_t* rec, /* in: record */ const ulint* offsets,/* in: array returned by rec_get_offsets() */ ulint n, /* in: index number of the field */ const void* data, /* in: pointer to the data if not SQL null */ ulint len); /* in: length of the data or UNIV_SQL_NULL. If not SQL null, must have the same length as the previous value. If SQL null, previous value must be SQL null. */ /************************************************************** The following function returns the data size of an old-style physical record, that is the sum of field lengths. SQL null fields are counted as length 0 fields. The value returned by the function is the distance from record origin to record end in bytes. */ UNIV_INLINE ulint rec_get_data_size_old( /*==================*/ /* out: size */ rec_t* rec); /* in: physical record */ /************************************************************** The following function returns the number of fields in a record. */ UNIV_INLINE ulint rec_offs_n_fields( /*===============*/ /* out: number of fields */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /************************************************************** The following function returns the data size of a physical record, that is the sum of field lengths. SQL null fields are counted as length 0 fields. The value returned by the function is the distance from record origin to record end in bytes. */ UNIV_INLINE ulint rec_offs_data_size( /*===============*/ /* out: size */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /************************************************************** Returns the total size of record minus data size of record. The value returned by the function is the distance from record start to record origin in bytes. */ UNIV_INLINE ulint rec_offs_extra_size( /*================*/ /* out: size */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /************************************************************** Returns the total size of a physical record. */ UNIV_INLINE ulint rec_offs_size( /*==========*/ /* out: size */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /************************************************************** Returns a pointer to the start of the record. */ UNIV_INLINE byte* rec_get_start( /*==========*/ /* out: pointer to start */ rec_t* rec, /* in: pointer to record */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /************************************************************** Returns a pointer to the end of the record. */ UNIV_INLINE byte* rec_get_end( /*========*/ /* out: pointer to end */ rec_t* rec, /* in: pointer to record */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /******************************************************************* Copies a physical record to a buffer. */ UNIV_INLINE rec_t* rec_copy( /*=====*/ /* out: pointer to the origin of the copy */ void* buf, /* in: buffer */ const rec_t* rec, /* in: physical record */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /****************************************************************** Copies the first n fields of a physical record to a new physical record in a buffer. */ rec_t* rec_copy_prefix_to_buf( /*===================*/ /* out, own: copied record */ rec_t* rec, /* in: physical record */ dict_index_t* index, /* in: record descriptor */ ulint n_fields, /* in: number of fields to copy */ byte** buf, /* in/out: memory buffer for the copied prefix, or NULL */ ulint* buf_size); /* in/out: buffer size */ /**************************************************************** Folds a prefix of a physical record to a ulint. */ UNIV_INLINE ulint rec_fold( /*=====*/ /* out: the folded value */ rec_t* rec, /* in: the physical record */ const ulint* offsets, /* in: array returned by rec_get_offsets() */ ulint n_fields, /* in: number of complete fields to fold */ ulint n_bytes, /* in: number of bytes to fold in an incomplete last field */ dulint tree_id); /* in: index tree id */ /************************************************************* Builds a physical record out of a data tuple and stores it beginning from address destination. */ rec_t* rec_convert_dtuple_to_rec( /*======================*/ /* out: pointer to the origin of physical record */ byte* buf, /* in: start address of the physical record */ dict_index_t* index, /* in: record descriptor */ dtuple_t* dtuple);/* in: data tuple */ /************************************************************** Returns the extra size of an old-style physical record if we know its data size and number of fields. */ UNIV_INLINE ulint rec_get_converted_extra_size( /*=========================*/ /* out: extra size */ ulint data_size, /* in: data size */ ulint n_fields) /* in: number of fields */ __attribute__((const)); /************************************************************** The following function returns the size of a data tuple when converted to a physical record. */ UNIV_INLINE ulint rec_get_converted_size( /*===================*/ /* out: size */ dict_index_t* index, /* in: record descriptor */ dtuple_t* dtuple);/* in: data tuple */ /****************************************************************** Copies the first n fields of a physical record to a data tuple. The fields are copied to the memory heap. */ void rec_copy_prefix_to_dtuple( /*======================*/ dtuple_t* tuple, /* in: data tuple */ rec_t* rec, /* in: physical record */ dict_index_t* index, /* in: record descriptor */ ulint n_fields, /* in: number of fields to copy */ mem_heap_t* heap); /* in: memory heap */ /******************************************************************* Validates the consistency of a physical record. */ ibool rec_validate( /*=========*/ /* out: TRUE if ok */ rec_t* rec, /* in: physical record */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /******************************************************************* Prints an old-style physical record. */ void rec_print_old( /*==========*/ FILE* file, /* in: file where to print */ rec_t* rec); /* in: physical record */ /******************************************************************* Prints a physical record. */ void rec_print_new( /*==========*/ FILE* file, /* in: file where to print */ rec_t* rec, /* in: physical record */ const ulint* offsets);/* in: array returned by rec_get_offsets() */ /******************************************************************* Prints a physical record. */ void rec_print( /*======*/ FILE* file, /* in: file where to print */ rec_t* rec, /* in: physical record */ dict_index_t* index); /* in: record descriptor */ #define REC_INFO_BITS 6 /* This is single byte bit-field */ /* Maximum lengths for the data in a physical record if the offsets are given in one byte (resp. two byte) format. */ #define REC_1BYTE_OFFS_LIMIT 0x7FUL #define REC_2BYTE_OFFS_LIMIT 0x7FFFUL /* The data size of record must be smaller than this because we reserve two upmost bits in a two byte offset for special purposes */ #define REC_MAX_DATA_SIZE (16 * 1024) #ifndef UNIV_NONINL #include "rem0rec.ic" #endif #endif