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/* Copyright (C) 2003 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef NDB_SQL_UTIL_HPP
#define NDB_SQL_UTIL_HPP
#include <ndb_global.h>
#include <kernel/ndb_limits.h>
struct charset_info_st;
typedef struct charset_info_st CHARSET_INFO;
class NdbSqlUtil {
public:
/**
* Compare strings, optionally with padded semantics. Returns
* negative (less), zero (equal), or positive (greater).
*/
static int char_compare(const char* s1, unsigned n1,
const char* s2, unsigned n2, bool padded);
/**
* Like operator, optionally with padded semantics. Returns true or
* false.
*/
static bool char_like(const char* s1, unsigned n1,
const char* s2, unsigned n2, bool padded);
/**
* Compare attribute values. Returns -1, 0, +1 for less, equal,
* greater, respectively. Parameters are pointers to values and their
* lengths in bytes. The lengths can differ.
*
* First value is a full value but second value can be partial. If
* the partial value is not enough to determine the result, CmpUnknown
* will be returned. A shorter second value is not necessarily
* partial. Partial values are allowed only for types where prefix
* comparison is possible (basically, binary types).
*
* First parameter is a pointer to type specific extra info. Char
* types receive CHARSET_INFO in it.
*
* If a value cannot be parsed, it compares like NULL i.e. less than
* any valid value.
*/
typedef int Cmp(const void* info, const void* p1, unsigned n1, const void* p2, unsigned n2, bool full);
enum CmpResult {
CmpLess = -1,
CmpEqual = 0,
CmpGreater = 1,
CmpUnknown = 2 // insufficient partial data
};
struct Type {
enum Enum {
Undefined = NDB_TYPE_UNDEFINED,
Tinyint = NDB_TYPE_TINYINT,
Tinyunsigned = NDB_TYPE_TINYUNSIGNED,
Smallint = NDB_TYPE_SMALLINT,
Smallunsigned = NDB_TYPE_SMALLUNSIGNED,
Mediumint = NDB_TYPE_MEDIUMINT,
Mediumunsigned = NDB_TYPE_MEDIUMUNSIGNED,
Int = NDB_TYPE_INT,
Unsigned = NDB_TYPE_UNSIGNED,
Bigint = NDB_TYPE_BIGINT,
Bigunsigned = NDB_TYPE_BIGUNSIGNED,
Float = NDB_TYPE_FLOAT,
Double = NDB_TYPE_DOUBLE,
Decimal = NDB_TYPE_DECIMAL,
Char = NDB_TYPE_CHAR,
Varchar = NDB_TYPE_VARCHAR,
Binary = NDB_TYPE_BINARY,
Varbinary = NDB_TYPE_VARBINARY,
Datetime = NDB_TYPE_DATETIME,
Date = NDB_TYPE_DATE,
Blob = NDB_TYPE_BLOB,
Text = NDB_TYPE_TEXT,
Bit = NDB_TYPE_BIT,
Longvarchar = NDB_TYPE_LONG_VARCHAR,
Longvarbinary = NDB_TYPE_LONG_VARBINARY,
Time = NDB_TYPE_TIME,
Year = NDB_TYPE_YEAR,
Timestamp = NDB_TYPE_TIMESTAMP
};
Enum m_typeId; // redundant
Cmp* m_cmp; // comparison method
};
/**
* Get type by id. Can return the Undefined type.
*/
static const Type& getType(Uint32 typeId);
/**
* Get the normalized type used in hashing and key comparisons.
* Maps all string types to Binary.
*/
static const Type& getTypeBinary(Uint32 typeId);
/**
* Check character set.
*/
static bool usable_in_pk(Uint32 typeId, const void* info);
static bool usable_in_hash_index(Uint32 typeId, const void* info);
static bool usable_in_ordered_index(Uint32 typeId, const void* info);
/**
* Get number of length bytes and length from variable length string.
* Returns false on error (invalid data). For other types returns
* zero length bytes and the fixed attribute length.
*/
static bool get_var_length(Uint32 typeId, const void* p, unsigned attrlen, Uint32& lb, Uint32& len);
/**
* Temporary workaround for bug#7284.
*/
static int strnxfrm_bug7284(CHARSET_INFO* cs, unsigned char* dst, unsigned dstLen, const unsigned char*src, unsigned srcLen);
private:
/**
* List of all types. Must match Type::Enum.
*/
static const Type m_typeList[];
/**
* Comparison methods.
*/
static Cmp cmpTinyint;
static Cmp cmpTinyunsigned;
static Cmp cmpSmallint;
static Cmp cmpSmallunsigned;
static Cmp cmpMediumint;
static Cmp cmpMediumunsigned;
static Cmp cmpInt;
static Cmp cmpUnsigned;
static Cmp cmpBigint;
static Cmp cmpBigunsigned;
static Cmp cmpFloat;
static Cmp cmpDouble;
static Cmp cmpDecimal;
static Cmp cmpChar;
static Cmp cmpVarchar;
static Cmp cmpBinary;
static Cmp cmpVarbinary;
static Cmp cmpDatetime;
static Cmp cmpDate;
static Cmp cmpBlob;
static Cmp cmpText;
static Cmp cmpBit;
static Cmp cmpLongvarchar;
static Cmp cmpLongvarbinary;
static Cmp cmpTime;
static Cmp cmpYear;
static Cmp cmpTimestamp;
};
#endif
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