dict0mem.c

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

/**********************************************************************
Data dictionary memory object creation

(c) 1996 Innobase Oy

Created 1/8/1996 Heikki Tuuri
***********************************************************************/

#include "dict0mem.h"

#ifdef UNIV_NONINL
#include "dict0mem.ic"
#endif

#include "rem0rec.h"
#include "data0type.h"
#include "mach0data.h"
#include "dict0dict.h"
#include "que0que.h"
#include "pars0pars.h"
#include "lock0lock.h"

#define	DICT_HEAP_SIZE		100	/* initial memory heap size when
					creating a table or index object */

/**************************************************************************
Creates a table memory object. */

dict_table_t*
dict_mem_table_create(
/*==================*/
				/* out, own: table object */
	const char*	name,	/* in: table name */
	ulint		space,	/* in: space where the clustered index of
				the table is placed; this parameter is
				ignored if the table is made a member of
				a cluster */
	ulint		n_cols,	/* in: number of columns */
	ibool		comp)	/* in: TRUE=compact page format */
{
	dict_table_t*	table;
	mem_heap_t*	heap;
	
	ut_ad(name);
	ut_ad(comp == FALSE || comp == TRUE);

	heap = mem_heap_create(DICT_HEAP_SIZE);

	table = mem_heap_alloc(heap, sizeof(dict_table_t));

	table->heap = heap;

	table->type = DICT_TABLE_ORDINARY;
	table->name = mem_heap_strdup(heap, name);
	table->dir_path_of_temp_table = NULL;
	table->space = space;
	table->ibd_file_missing = FALSE;
	table->tablespace_discarded = FALSE;
	table->comp = comp;
	table->n_def = 0;
	table->n_cols = n_cols + DATA_N_SYS_COLS;
	table->mem_fix = 0;

	table->n_mysql_handles_opened = 0;
	table->n_foreign_key_checks_running = 0;
		
	table->cached = FALSE;
	
	table->mix_id = ut_dulint_zero;
	table->mix_len = 0;
	
	table->cols = mem_heap_alloc(heap, (n_cols + DATA_N_SYS_COLS)
							* sizeof(dict_col_t));
	UT_LIST_INIT(table->indexes);

	table->auto_inc_lock = mem_heap_alloc(heap, lock_get_size());

	table->query_cache_inv_trx_id = ut_dulint_zero;

	UT_LIST_INIT(table->locks);
	UT_LIST_INIT(table->foreign_list);
	UT_LIST_INIT(table->referenced_list);

	table->does_not_fit_in_memory = FALSE;

	table->stat_initialized = FALSE;

	table->stat_modified_counter = 0;
	
	mutex_create(&(table->autoinc_mutex));
	mutex_set_level(&(table->autoinc_mutex), SYNC_DICT_AUTOINC_MUTEX);

	table->autoinc_inited = FALSE;

	table->magic_n = DICT_TABLE_MAGIC_N;
	
	return(table);
}

/**************************************************************************
Creates a cluster memory object. */

dict_table_t*
dict_mem_cluster_create(
/*====================*/
				/* out, own: cluster object */
	const char*	name,	/* in: cluster name */
	ulint		space,	/* in: space where the clustered indexes
				of the member tables are placed */
	ulint		n_cols,	/* in: number of columns */
	ulint		mix_len)/* in: length of the common key prefix in the
				cluster */
{
	dict_table_t*		cluster;

	/* Clustered tables cannot work with the compact record format. */
	cluster = dict_mem_table_create(name, space, n_cols, FALSE);

	cluster->type = DICT_TABLE_CLUSTER;
	cluster->mix_len = mix_len;

	return(cluster);
}

/**************************************************************************
Declares a non-published table as a member in a cluster. */

void
dict_mem_table_make_cluster_member(
/*===============================*/
	dict_table_t*	table,		/* in: non-published table */
	const char*	cluster_name)	/* in: cluster name */
{
	table->type = DICT_TABLE_CLUSTER_MEMBER;
	table->cluster_name = cluster_name;
}

/**************************************************************************
Adds a column definition to a table. */

void
dict_mem_table_add_col(
/*===================*/
	dict_table_t*	table,	/* in: table */
	const char*	name,	/* in: column name */
	ulint		mtype,	/* in: main datatype */
	ulint		prtype,	/* in: precise type */
	ulint		len,	/* in: length */
	ulint		prec)	/* in: precision */
{
	dict_col_t*	col;
	dtype_t*	type;
	
	ut_ad(table && name);
	ut_ad(table->magic_n == DICT_TABLE_MAGIC_N);
	
	table->n_def++;

	col = dict_table_get_nth_col(table, table->n_def - 1);	

	col->ind = table->n_def - 1;
	col->name = mem_heap_strdup(table->heap, name);
	col->table = table;
	col->ord_part = 0;

	col->clust_pos = ULINT_UNDEFINED;
	
	type = dict_col_get_type(col);

	dtype_set(type, mtype, prtype, len, prec);
}

/**************************************************************************
Creates an index memory object. */

dict_index_t*
dict_mem_index_create(
/*==================*/
					/* out, own: index object */
	const char*	table_name,	/* in: table name */
	const char*	index_name,	/* in: index name */
	ulint		space,		/* in: space where the index tree is
					placed, ignored if the index is of
					the clustered type */
	ulint		type,		/* in: DICT_UNIQUE,
					DICT_CLUSTERED, ... ORed */
	ulint		n_fields)	/* in: number of fields */
{
	dict_index_t*	index;
	mem_heap_t*	heap;
	
	ut_ad(table_name && index_name);

	heap = mem_heap_create(DICT_HEAP_SIZE);
	index = mem_heap_alloc(heap, sizeof(dict_index_t));

	index->heap = heap;
	
	index->type = type;
	index->space = space;
	index->name = mem_heap_strdup(heap, index_name);
	index->table_name = table_name;
	index->table = NULL;
	index->n_def = index->n_nullable = 0;
	index->n_fields = n_fields;
	index->fields = mem_heap_alloc(heap, 1 + n_fields
						* sizeof(dict_field_t));
					/* The '1 +' above prevents allocation
					of an empty mem block */
	index->stat_n_diff_key_vals = NULL;

	index->cached = FALSE;
	index->magic_n = DICT_INDEX_MAGIC_N;

	return(index);
}

/**************************************************************************
Creates and initializes a foreign constraint memory object. */

dict_foreign_t*
dict_mem_foreign_create(void)
/*=========================*/
				/* out, own: foreign constraint struct */
{
	dict_foreign_t*	foreign;
	mem_heap_t*	heap;

	heap = mem_heap_create(100);

	foreign = mem_heap_alloc(heap, sizeof(dict_foreign_t));

	foreign->heap = heap;

	foreign->id = NULL;

	foreign->type = 0;
	foreign->foreign_table_name = NULL;
	foreign->foreign_table = NULL;
	foreign->foreign_col_names = NULL;

	foreign->referenced_table_name = NULL;
	foreign->referenced_table = NULL;
	foreign->referenced_col_names = NULL;

	foreign->n_fields = 0;

	foreign->foreign_index = NULL;
	foreign->referenced_index = NULL;

	return(foreign);
}

/**************************************************************************
Adds a field definition to an index. NOTE: does not take a copy
of the column name if the field is a column. The memory occupied
by the column name may be released only after publishing the index. */

void
dict_mem_index_add_field(
/*=====================*/
	dict_index_t*	index,		/* in: index */
	const char*	name,		/* in: column name */
	ulint		order,		/* in: order criterion; 0 means an
					ascending order */
	ulint		prefix_len)	/* in: 0 or the column prefix length
					in a MySQL index like
					INDEX (textcol(25)) */
{
	dict_field_t*	field;
	
	ut_ad(index && name);
	ut_ad(index->magic_n == DICT_INDEX_MAGIC_N);
	
	index->n_def++;

	field = dict_index_get_nth_field(index, index->n_def - 1);	

	field->name = name;
	field->order = order;

	field->prefix_len = prefix_len;
}

/**************************************************************************
Frees an index memory object. */

void
dict_mem_index_free(
/*================*/
	dict_index_t*	index)	/* in: index */
{
	mem_heap_free(index->heap);
}