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/************************************************************************
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SQL data field and tuple
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(c) 1994-1996 Innobase Oy
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Created 5/30/1994 Heikki Tuuri
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*************************************************************************/
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extern byte data_error;
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/*************************************************************************
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Gets pointer to the type struct of SQL data field. */
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/* out: pointer to the type struct */
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dfield_t* field) /* in: SQL data field */
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return(&(field->type));
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/*************************************************************************
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Sets the type struct of SQL data field. */
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dfield_t* field, /* in: SQL data field */
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dtype_t* type) /* in: pointer to data type struct */
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/*************************************************************************
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Gets pointer to the data in a field. */
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/* out: pointer to data */
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dfield_t* field) /* in: field */
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ut_ad((field->len == UNIV_SQL_NULL)
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|| (field->data != &data_error));
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/*************************************************************************
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Gets length of field data. */
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/* out: length of data; UNIV_SQL_NULL if
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dfield_t* field) /* in: field */
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ut_ad((field->len == UNIV_SQL_NULL)
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|| (field->data != &data_error));
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/*************************************************************************
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Sets length in a field. */
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dfield_t* field, /* in: field */
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ulint len) /* in: length or UNIV_SQL_NULL */
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/*************************************************************************
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Sets pointer to the data and length in a field. */
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dfield_t* field, /* in: field */
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const void* data, /* in: data */
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ulint len) /* in: length or UNIV_SQL_NULL */
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field->data = (void*) data;
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/*************************************************************************
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Copies the data and len fields. */
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dfield_t* field1, /* in: field to copy to */
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dfield_t* field2) /* in: field to copy from */
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ut_ad(field1 && field2);
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field1->data = field2->data;
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field1->len = field2->len;
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/*************************************************************************
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Copies a data field to another. */
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dfield_t* field1, /* in: field to copy to */
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dfield_t* field2) /* in: field to copy from */
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/*************************************************************************
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Tests if data length and content is equal for two dfields. */
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dfield_datas_are_binary_equal(
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/*==========================*/
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/* out: TRUE if equal */
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dfield_t* field1, /* in: field */
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dfield_t* field2) /* in: field */
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if ((len != field2->len)
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|| ((len != UNIV_SQL_NULL)
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&& (0 != ut_memcmp(field1->data, field2->data, len)))) {
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/*************************************************************************
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Gets info bits in a data tuple. */
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dtuple_get_info_bits(
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/*=================*/
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dtuple_t* tuple) /* in: tuple */
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return(tuple->info_bits);
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/*************************************************************************
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Sets info bits in a data tuple. */
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dtuple_set_info_bits(
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/*=================*/
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dtuple_t* tuple, /* in: tuple */
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ulint info_bits) /* in: info bits */
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tuple->info_bits = info_bits;
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/*************************************************************************
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Gets number of fields used in record comparisons. */
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dtuple_get_n_fields_cmp(
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/*====================*/
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/* out: number of fields used in comparisons
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dtuple_t* tuple) /* in: tuple */
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return(tuple->n_fields_cmp);
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/*************************************************************************
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Sets number of fields used in record comparisons. */
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dtuple_set_n_fields_cmp(
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/*====================*/
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dtuple_t* tuple, /* in: tuple */
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ulint n_fields_cmp) /* in: number of fields used in
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comparisons in rem0cmp.* */
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ut_ad(n_fields_cmp <= tuple->n_fields);
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tuple->n_fields_cmp = n_fields_cmp;
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/*************************************************************************
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Gets number of fields in a data tuple. */
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/* out: number of fields */
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dtuple_t* tuple) /* in: tuple */
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return(tuple->n_fields);
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/*************************************************************************
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Gets nth field of a tuple. */
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dtuple_get_nth_field(
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/*=================*/
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dtuple_t* tuple, /* in: tuple */
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ulint n) /* in: index of field */
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ut_ad(n < tuple->n_fields);
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return(tuple->fields + n);
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/**************************************************************
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Creates a data tuple to a memory heap. The default value for number
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of fields used in record comparisons for this tuple is n_fields. */
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/* out, own: created tuple */
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mem_heap_t* heap, /* in: memory heap where the tuple
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ulint n_fields) /* in: number of fields */
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tuple = (dtuple_t*) mem_heap_alloc(heap, sizeof(dtuple_t)
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+ n_fields * sizeof(dfield_t));
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tuple->info_bits = 0;
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tuple->n_fields = n_fields;
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tuple->n_fields_cmp = n_fields;
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tuple->fields = (dfield_t*)(((byte*)tuple) + sizeof(dtuple_t));
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tuple->magic_n = DATA_TUPLE_MAGIC_N;
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{ /* In the debug version, initialize fields to an error value */
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for (i = 0; i < n_fields; i++) {
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(tuple->fields + i)->data = &data_error;
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dfield_get_type(tuple->fields + i)->mtype = DATA_ERROR;
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/**************************************************************
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The following function returns the sum of data lengths of a tuple. The space
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occupied by the field structs or the tuple struct is not counted. Neither
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is possible space in externally stored parts of the field. */
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dtuple_get_data_size(
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/*=================*/
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/* out: sum of data lengths */
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dtuple_t* tuple) /* in: typed data tuple */
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ut_ad(dtuple_check_typed(tuple));
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ut_ad(tuple->magic_n == DATA_TUPLE_MAGIC_N);
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n_fields = tuple->n_fields;
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for (i = 0; i < n_fields; i++) {
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field = dtuple_get_nth_field(tuple, i);
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len = dfield_get_len(field);
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if (len == UNIV_SQL_NULL) {
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len = dtype_get_sql_null_size(dfield_get_type(field));
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/***********************************************************************
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Sets types of fields binary in a tuple. */
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dtuple_set_types_binary(
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/*====================*/
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dtuple_t* tuple, /* in: data tuple */
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ulint n) /* in: number of fields to set */
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dtype_t* dfield_type;
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for (i = 0; i < n; i++) {
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dfield_type = dfield_get_type(dtuple_get_nth_field(tuple, i));
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dtype_set(dfield_type, DATA_BINARY, 0, 0, 0);
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/****************************************************************
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Folds a prefix given as the number of fields of a tuple. */
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/* out: the folded value */
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dtuple_t* tuple, /* in: the tuple */
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ulint n_fields,/* in: number of complete fields to fold */
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ulint n_bytes,/* in: number of bytes to fold in an
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incomplete last field */
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dulint tree_id)/* in: index tree id */
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ut_ad(tuple->magic_n == DATA_TUPLE_MAGIC_N);
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ut_ad(dtuple_check_typed(tuple));
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fold = ut_fold_dulint(tree_id);
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for (i = 0; i < n_fields; i++) {
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field = dtuple_get_nth_field(tuple, i);
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data = (byte*) dfield_get_data(field);
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len = dfield_get_len(field);
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if (len != UNIV_SQL_NULL) {
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fold = ut_fold_ulint_pair(fold,
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ut_fold_binary(data, len));
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field = dtuple_get_nth_field(tuple, i);
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data = (byte*) dfield_get_data(field);
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len = dfield_get_len(field);
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if (len != UNIV_SQL_NULL) {
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fold = ut_fold_ulint_pair(fold,
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ut_fold_binary(data, len));
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/**************************************************************************
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Writes an SQL null field full of zeros. */
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byte* data, /* in: pointer to a buffer of size len */
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ulint len) /* in: SQL null size in bytes */
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for (j = 0; j < len; j++) {
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/**************************************************************************
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Checks if a dtuple contains an SQL null value. */
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dtuple_contains_null(
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/*=================*/
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/* out: TRUE if some field is SQL null */
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dtuple_t* tuple) /* in: dtuple */
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n = dtuple_get_n_fields(tuple);
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for (i = 0; i < n; i++) {
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if (dfield_get_len(dtuple_get_nth_field(tuple, i))
added
removed
include/data0data.ic
