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/*****************************************************************************
Copyright (c) 1996, 2011, Oracle and/or its affiliates. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file data/data0type.cc
Data types
Created 1/16/1996 Heikki Tuuri
*******************************************************/
#include "data0type.h"
#ifdef UNIV_NONINL
#include "data0type.ic"
#endif
#ifndef UNIV_HOTBACKUP
# include "ha_prototypes.h"
/* At the database startup we store the default-charset collation number of
this MySQL installation to this global variable. If we have < 4.1.2 format
column definitions, or records in the insert buffer, we use this
charset-collation code for them. */
UNIV_INTERN ulint data_mysql_default_charset_coll;
/*********************************************************************//**
Determine how many bytes the first n characters of the given string occupy.
If the string is shorter than n characters, returns the number of bytes
the characters in the string occupy.
@return length of the prefix, in bytes */
UNIV_INTERN
ulint
dtype_get_at_most_n_mbchars(
/*========================*/
ulint prtype, /*!< in: precise type */
ulint mbminmaxlen, /*!< in: minimum and maximum length of
a multi-byte character */
ulint prefix_len, /*!< in: length of the requested
prefix, in characters, multiplied by
dtype_get_mbmaxlen(dtype) */
ulint data_len, /*!< in: length of str (in bytes) */
const char* str) /*!< in: the string whose prefix
length is being determined */
{
ulint mbminlen = DATA_MBMINLEN(mbminmaxlen);
ulint mbmaxlen = DATA_MBMAXLEN(mbminmaxlen);
ut_a(data_len != UNIV_SQL_NULL);
ut_ad(!mbmaxlen || !(prefix_len % mbmaxlen));
if (mbminlen != mbmaxlen) {
ut_a(!(prefix_len % mbmaxlen));
return(innobase_get_at_most_n_mbchars(
dtype_get_charset_coll(prtype),
prefix_len, data_len, str));
}
if (prefix_len < data_len) {
return(prefix_len);
}
return(data_len);
}
#endif /* UNIV_HOTBACKUP */
/*********************************************************************//**
Checks if a data main type is a string type. Also a BLOB is considered a
string type.
@return TRUE if string type */
UNIV_INTERN
ibool
dtype_is_string_type(
/*=================*/
ulint mtype) /*!< in: InnoDB main data type code: DATA_CHAR, ... */
{
if (mtype <= DATA_BLOB
|| mtype == DATA_MYSQL
|| mtype == DATA_VARMYSQL) {
return(TRUE);
}
return(FALSE);
}
/*********************************************************************//**
Checks if a type is a binary string type. Note that for tables created with
< 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column. For
those DATA_BLOB columns this function currently returns FALSE.
@return TRUE if binary string type */
UNIV_INTERN
ibool
dtype_is_binary_string_type(
/*========================*/
ulint mtype, /*!< in: main data type */
ulint prtype) /*!< in: precise type */
{
if ((mtype == DATA_FIXBINARY)
|| (mtype == DATA_BINARY)
|| (mtype == DATA_BLOB && (prtype & DATA_BINARY_TYPE))) {
return(TRUE);
}
return(FALSE);
}
/*********************************************************************//**
Checks if a type is a non-binary string type. That is, dtype_is_string_type is
TRUE and dtype_is_binary_string_type is FALSE. Note that for tables created
with < 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column.
For those DATA_BLOB columns this function currently returns TRUE.
@return TRUE if non-binary string type */
UNIV_INTERN
ibool
dtype_is_non_binary_string_type(
/*============================*/
ulint mtype, /*!< in: main data type */
ulint prtype) /*!< in: precise type */
{
if (dtype_is_string_type(mtype) == TRUE
&& dtype_is_binary_string_type(mtype, prtype) == FALSE) {
return(TRUE);
}
return(FALSE);
}
/*********************************************************************//**
Forms a precise type from the < 4.1.2 format precise type plus the
charset-collation code.
@return precise type, including the charset-collation code */
UNIV_INTERN
ulint
dtype_form_prtype(
/*==============*/
ulint old_prtype, /*!< in: the MySQL type code and the flags
DATA_BINARY_TYPE etc. */
ulint charset_coll) /*!< in: MySQL charset-collation code */
{
ut_a(old_prtype < 256 * 256);
ut_a(charset_coll <= MAX_CHAR_COLL_NUM);
return(old_prtype + (charset_coll << 16));
}
/*********************************************************************//**
Validates a data type structure.
@return TRUE if ok */
UNIV_INTERN
ibool
dtype_validate(
/*===========*/
const dtype_t* type) /*!< in: type struct to validate */
{
ut_a(type);
ut_a(type->mtype >= DATA_VARCHAR);
ut_a(type->mtype <= DATA_MYSQL);
if (type->mtype == DATA_SYS) {
ut_a((type->prtype & DATA_MYSQL_TYPE_MASK) < DATA_N_SYS_COLS);
}
#ifndef UNIV_HOTBACKUP
ut_a(dtype_get_mbminlen(type) <= dtype_get_mbmaxlen(type));
#endif /* !UNIV_HOTBACKUP */
return(TRUE);
}
#ifndef UNIV_HOTBACKUP
/*********************************************************************//**
Prints a data type structure. */
UNIV_INTERN
void
dtype_print(
/*========*/
const dtype_t* type) /*!< in: type */
{
ulint mtype;
ulint prtype;
ulint len;
ut_a(type);
mtype = type->mtype;
prtype = type->prtype;
switch (mtype) {
case DATA_VARCHAR:
fputs("DATA_VARCHAR", stderr);
break;
case DATA_CHAR:
fputs("DATA_CHAR", stderr);
break;
case DATA_BINARY:
fputs("DATA_BINARY", stderr);
break;
case DATA_FIXBINARY:
fputs("DATA_FIXBINARY", stderr);
break;
case DATA_BLOB:
fputs("DATA_BLOB", stderr);
break;
case DATA_INT:
fputs("DATA_INT", stderr);
break;
case DATA_MYSQL:
fputs("DATA_MYSQL", stderr);
break;
case DATA_SYS:
fputs("DATA_SYS", stderr);
break;
case DATA_FLOAT:
fputs("DATA_FLOAT", stderr);
break;
case DATA_DOUBLE:
fputs("DATA_DOUBLE", stderr);
break;
case DATA_DECIMAL:
fputs("DATA_DECIMAL", stderr);
break;
case DATA_VARMYSQL:
fputs("DATA_VARMYSQL", stderr);
break;
default:
fprintf(stderr, "type %lu", (ulong) mtype);
break;
}
len = type->len;
if ((type->mtype == DATA_SYS)
|| (type->mtype == DATA_VARCHAR)
|| (type->mtype == DATA_CHAR)) {
putc(' ', stderr);
if (prtype == DATA_ROW_ID) {
fputs("DATA_ROW_ID", stderr);
len = DATA_ROW_ID_LEN;
} else if (prtype == DATA_ROLL_PTR) {
fputs("DATA_ROLL_PTR", stderr);
len = DATA_ROLL_PTR_LEN;
} else if (prtype == DATA_TRX_ID) {
fputs("DATA_TRX_ID", stderr);
len = DATA_TRX_ID_LEN;
} else if (prtype == DATA_ENGLISH) {
fputs("DATA_ENGLISH", stderr);
} else {
fprintf(stderr, "prtype %lu", (ulong) prtype);
}
} else {
if (prtype & DATA_UNSIGNED) {
fputs(" DATA_UNSIGNED", stderr);
}
if (prtype & DATA_BINARY_TYPE) {
fputs(" DATA_BINARY_TYPE", stderr);
}
if (prtype & DATA_NOT_NULL) {
fputs(" DATA_NOT_NULL", stderr);
}
}
fprintf(stderr, " len %lu", (ulong) len);
}
#endif /* !UNIV_HOTBACKUP */
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