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item_strfunc.h
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1058 lines (926 loc) · 28.1 KB
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#ifndef ITEM_STRFUNC_INCLUDED
#define ITEM_STRFUNC_INCLUDED
/* Copyright (c) 2000, 2015, 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
/* This file defines all string functions */
#include "crypt_genhash_impl.h"
class MY_LOCALE;
class Item_str_func :public Item_func
{
protected:
/**
Sets the result value of the function an empty string, using the current
character set. No memory is allocated.
@retval A pointer to the str_value member.
*/
String *make_empty_result() {
str_value.set("", 0, collation.collation);
return &str_value;
}
public:
Item_str_func() :Item_func() { decimals=NOT_FIXED_DEC; }
Item_str_func(Item *a) :Item_func(a) {decimals=NOT_FIXED_DEC; }
Item_str_func(Item *a,Item *b) :Item_func(a,b) { decimals=NOT_FIXED_DEC; }
Item_str_func(Item *a,Item *b,Item *c) :Item_func(a,b,c) { decimals=NOT_FIXED_DEC; }
Item_str_func(Item *a,Item *b,Item *c,Item *d) :Item_func(a,b,c,d) {decimals=NOT_FIXED_DEC; }
Item_str_func(Item *a,Item *b,Item *c,Item *d, Item* e) :Item_func(a,b,c,d,e) {decimals=NOT_FIXED_DEC; }
Item_str_func(List<Item> &list) :Item_func(list) {decimals=NOT_FIXED_DEC; }
longlong val_int();
double val_real();
my_decimal *val_decimal(my_decimal *);
bool get_date(MYSQL_TIME *ltime, uint fuzzydate)
{
return get_date_from_string(ltime, fuzzydate);
}
bool get_time(MYSQL_TIME *ltime)
{
return get_time_from_string(ltime);
}
enum Item_result result_type () const { return STRING_RESULT; }
void left_right_max_length();
bool fix_fields(THD *thd, Item **ref);
String *val_str_from_val_str_ascii(String *str, String *str2);
};
/*
Functions that return values with ASCII repertoire
*/
class Item_str_ascii_func :public Item_str_func
{
String ascii_buf;
public:
Item_str_ascii_func() :Item_str_func()
{ collation.set_repertoire(MY_REPERTOIRE_ASCII); }
Item_str_ascii_func(Item *a) :Item_str_func(a)
{ collation.set_repertoire(MY_REPERTOIRE_ASCII); }
Item_str_ascii_func(Item *a,Item *b) :Item_str_func(a,b)
{ collation.set_repertoire(MY_REPERTOIRE_ASCII); }
Item_str_ascii_func(Item *a,Item *b,Item *c) :Item_str_func(a,b,c)
{ collation.set_repertoire(MY_REPERTOIRE_ASCII); }
String *val_str(String *str)
{
return val_str_from_val_str_ascii(str, &ascii_buf);
}
virtual String *val_str_ascii(String *)= 0;
};
class Item_func_md5 :public Item_str_ascii_func
{
String tmp_value;
public:
Item_func_md5(Item *a) :Item_str_ascii_func(a) {}
String *val_str_ascii(String *);
void fix_length_and_dec();
const char *func_name() const { return "md5"; }
};
class Item_func_sha :public Item_str_ascii_func
{
public:
Item_func_sha(Item *a) :Item_str_ascii_func(a) {}
String *val_str_ascii(String *);
void fix_length_and_dec();
const char *func_name() const { return "sha"; }
};
class Item_func_sha2 :public Item_str_ascii_func
{
public:
Item_func_sha2(Item *a, Item *b) :Item_str_ascii_func(a, b) {}
String *val_str_ascii(String *);
void fix_length_and_dec();
const char *func_name() const { return "sha2"; }
};
class Item_func_to_base64 :public Item_str_ascii_func
{
String tmp_value;
public:
Item_func_to_base64(Item *a) :Item_str_ascii_func(a) {}
String *val_str_ascii(String *);
void fix_length_and_dec();
const char *func_name() const { return "to_base64"; }
};
class Item_func_from_base64 :public Item_str_func
{
String tmp_value;
public:
Item_func_from_base64(Item *a) :Item_str_func(a) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "from_base64"; }
};
class Item_func_aes_encrypt :public Item_str_func
{
public:
Item_func_aes_encrypt(Item *a, Item *b) :Item_str_func(a,b) {}
Item_func_aes_encrypt(Item *a, Item *b, Item *c) :Item_str_func(a, b, c) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "aes_encrypt"; }
};
class Item_func_aes_decrypt :public Item_str_func
{
public:
Item_func_aes_decrypt(Item *a, Item *b) :Item_str_func(a,b) {}
Item_func_aes_decrypt(Item *a, Item *b, Item *c) :Item_str_func(a, b, c) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "aes_decrypt"; }
};
class Item_func_random_bytes : public Item_str_func
{
/** limitation from the SSL library */
static const longlong MAX_RANDOM_BYTES_BUFFER;
public:
Item_func_random_bytes(Item *a) : Item_str_func(a)
{}
void fix_length_and_dec();
String *val_str(String *a);
const char *func_name() const
{
return "random_bytes";
}
};
class Item_func_concat :public Item_str_func
{
String tmp_value;
public:
Item_func_concat(List<Item> &list) :Item_str_func(list) {}
Item_func_concat(Item *a,Item *b) :Item_str_func(a,b) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "concat"; }
};
class Item_func_concat_ws :public Item_str_func
{
String tmp_value;
public:
Item_func_concat_ws(List<Item> &list) :Item_str_func(list) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "concat_ws"; }
table_map not_null_tables() const { return 0; }
};
class Item_func_reverse :public Item_str_func
{
String tmp_value;
public:
Item_func_reverse(Item *a) :Item_str_func(a) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "reverse"; }
};
class Item_func_replace :public Item_str_func
{
String tmp_value,tmp_value2;
/** Holds result in case we need to allocate our own result buffer.*/
String tmp_value_res;
public:
Item_func_replace(Item *org,Item *find,Item *replace)
:Item_str_func(org,find,replace) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "replace"; }
};
class Item_func_insert :public Item_str_func
{
String tmp_value;
/** Holds result in case we need to allocate our own result buffer.*/
String tmp_value_res;
public:
Item_func_insert(Item *org,Item *start,Item *length,Item *new_str)
:Item_str_func(org,start,length,new_str) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "insert"; }
};
class Item_str_conv :public Item_str_func
{
protected:
uint multiply;
my_charset_conv_case converter;
String tmp_value;
public:
Item_str_conv(Item *item) :Item_str_func(item) {}
String *val_str(String *);
};
class Item_func_lcase :public Item_str_conv
{
public:
Item_func_lcase(Item *item) :Item_str_conv(item) {}
const char *func_name() const { return "lcase"; }
void fix_length_and_dec();
};
class Item_func_ucase :public Item_str_conv
{
public:
Item_func_ucase(Item *item) :Item_str_conv(item) {}
const char *func_name() const { return "ucase"; }
void fix_length_and_dec();
};
class Item_func_left :public Item_str_func
{
String tmp_value;
public:
Item_func_left(Item *a,Item *b) :Item_str_func(a,b) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "left"; }
};
class Item_func_right :public Item_str_func
{
String tmp_value;
public:
Item_func_right(Item *a,Item *b) :Item_str_func(a,b) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "right"; }
};
class Item_func_substr :public Item_str_func
{
String tmp_value;
public:
Item_func_substr(Item *a,Item *b) :Item_str_func(a,b) {}
Item_func_substr(Item *a,Item *b,Item *c) :Item_str_func(a,b,c) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "substr"; }
};
class Item_func_substr_index :public Item_str_func
{
String tmp_value;
public:
Item_func_substr_index(Item *a,Item *b,Item *c) :Item_str_func(a,b,c) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "substring_index"; }
};
class Item_func_trim :public Item_str_func
{
protected:
String tmp_value;
String remove;
public:
Item_func_trim(Item *a,Item *b) :Item_str_func(a,b) {}
Item_func_trim(Item *a) :Item_str_func(a) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "trim"; }
virtual void print(String *str, enum_query_type query_type);
virtual const char *mode_name() const { return "both"; }
};
class Item_func_ltrim :public Item_func_trim
{
public:
Item_func_ltrim(Item *a,Item *b) :Item_func_trim(a,b) {}
Item_func_ltrim(Item *a) :Item_func_trim(a) {}
String *val_str(String *);
const char *func_name() const { return "ltrim"; }
const char *mode_name() const { return "leading"; }
};
class Item_func_rtrim :public Item_func_trim
{
public:
Item_func_rtrim(Item *a,Item *b) :Item_func_trim(a,b) {}
Item_func_rtrim(Item *a) :Item_func_trim(a) {}
String *val_str(String *);
const char *func_name() const { return "rtrim"; }
const char *mode_name() const { return "trailing"; }
};
/*
Item_func_password -- new (4.1.1) PASSWORD() function implementation.
Returns strcat('*', octet2hex(sha1(sha1(password)))). '*' stands for new
password format, sha1(sha1(password) is so-called hash_stage2 value.
Length of returned string is always 41 byte. To find out how entire
authentication procedure works, see comments in password.c.
*/
class Item_func_password :public Item_str_ascii_func
{
char m_hashed_password_buffer[CRYPT_MAX_PASSWORD_SIZE + 1];
unsigned int m_hashed_password_buffer_len;
bool m_recalculate_password;
public:
Item_func_password(Item *a) : Item_str_ascii_func(a)
{
m_hashed_password_buffer_len= 0;
m_recalculate_password= false;
}
String *val_str_ascii(String *str);
void fix_length_and_dec();
const char *func_name() const { return "password"; }
static char *create_password_hash_buffer(THD *thd, const char *password,
size_t pass_len);
};
/*
Item_func_old_password -- PASSWORD() implementation used in MySQL 3.21 - 4.0
compatibility mode. This item is created in sql_yacc.yy when
'old_passwords' session variable is set, and to handle OLD_PASSWORD()
function.
*/
class Item_func_old_password :public Item_str_ascii_func
{
char tmp_value[SCRAMBLED_PASSWORD_CHAR_LENGTH_323+1];
public:
Item_func_old_password(Item *a) :Item_str_ascii_func(a) {}
String *val_str_ascii(String *str);
void fix_length_and_dec()
{
fix_length_and_charset(SCRAMBLED_PASSWORD_CHAR_LENGTH_323, default_charset());
}
const char *func_name() const { return "old_password"; }
static char *alloc(THD *thd, const char *password, size_t pass_len);
};
class Item_func_des_encrypt :public Item_str_func
{
String tmp_value,tmp_arg;
public:
Item_func_des_encrypt(Item *a) :Item_str_func(a) {}
Item_func_des_encrypt(Item *a, Item *b): Item_str_func(a,b) {}
String *val_str(String *);
void fix_length_and_dec()
{
maybe_null=1;
/* 9 = MAX ((8- (arg_len % 8)) + 1) */
max_length = args[0]->max_length + 9;
}
const char *func_name() const { return "des_encrypt"; }
};
class Item_func_des_decrypt :public Item_str_func
{
String tmp_value;
public:
Item_func_des_decrypt(Item *a) :Item_str_func(a) {}
Item_func_des_decrypt(Item *a, Item *b): Item_str_func(a,b) {}
String *val_str(String *);
void fix_length_and_dec()
{
maybe_null=1;
/* 9 = MAX ((8- (arg_len % 8)) + 1) */
max_length= args[0]->max_length;
if (max_length >= 9U)
max_length-= 9U;
}
const char *func_name() const { return "des_decrypt"; }
};
class Item_func_encrypt :public Item_str_func
{
String tmp_value;
/* Encapsulate common constructor actions */
void constructor_helper()
{
collation.set(&my_charset_bin);
}
public:
Item_func_encrypt(Item *a) :Item_str_func(a)
{
constructor_helper();
}
Item_func_encrypt(Item *a, Item *b): Item_str_func(a,b)
{
constructor_helper();
}
String *val_str(String *);
void fix_length_and_dec() { maybe_null=1; max_length = 13; }
const char *func_name() const { return "encrypt"; }
};
#include "sql_crypt.h"
class Item_func_encode :public Item_str_func
{
private:
/** Whether the PRNG has already been seeded. */
bool seeded;
/** Holds result in case we need to allocate our own result buffer.*/
String tmp_value_res;
protected:
SQL_CRYPT sql_crypt;
public:
Item_func_encode(Item *a, Item *seed):
Item_str_func(a, seed) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "encode"; }
protected:
virtual void crypto_transform(String *);
private:
/** Provide a seed for the PRNG sequence. */
bool seed();
};
class Item_func_decode :public Item_func_encode
{
public:
Item_func_decode(Item *a, Item *seed): Item_func_encode(a, seed) {}
const char *func_name() const { return "decode"; }
protected:
void crypto_transform(String *);
};
class Item_func_sysconst :public Item_str_func
{
public:
Item_func_sysconst()
{ collation.set(system_charset_info,DERIVATION_SYSCONST); }
Item *safe_charset_converter(const CHARSET_INFO *tocs);
/*
Used to create correct Item name in new converted item in
safe_charset_converter, return string representation of this function
call
*/
virtual const Name_string fully_qualified_func_name() const = 0;
};
class Item_func_database :public Item_func_sysconst
{
public:
Item_func_database() :Item_func_sysconst() {}
String *val_str(String *);
void fix_length_and_dec()
{
max_length= MAX_FIELD_NAME * system_charset_info->mbmaxlen;
maybe_null=1;
}
const char *func_name() const { return "database"; }
const Name_string fully_qualified_func_name() const
{ return NAME_STRING("database()"); }
};
class Item_func_user :public Item_func_sysconst
{
protected:
bool init (const char *user, const char *host);
public:
Item_func_user()
{
str_value.set("", 0, system_charset_info);
}
String *val_str(String *)
{
DBUG_ASSERT(fixed == 1);
return (null_value ? 0 : &str_value);
}
bool fix_fields(THD *thd, Item **ref);
void fix_length_and_dec()
{
max_length= (USERNAME_LENGTH +
(HOSTNAME_LENGTH + 1) * SYSTEM_CHARSET_MBMAXLEN);
}
const char *func_name() const { return "user"; }
const Name_string fully_qualified_func_name() const
{ return NAME_STRING("user()"); }
type_conversion_status save_in_field(Field *field, bool no_conversions)
{
return save_str_value_in_field(field, &str_value);
}
};
class Item_func_current_user :public Item_func_user
{
Name_resolution_context *context;
public:
Item_func_current_user(Name_resolution_context *context_arg)
: context(context_arg) {}
bool fix_fields(THD *thd, Item **ref);
const char *func_name() const { return "current_user"; }
const Name_string fully_qualified_func_name() const
{ return NAME_STRING("current_user()"); }
};
class Item_func_soundex :public Item_str_func
{
String tmp_value;
public:
Item_func_soundex(Item *a) :Item_str_func(a) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "soundex"; }
};
class Item_func_elt :public Item_str_func
{
public:
Item_func_elt(List<Item> &list) :Item_str_func(list) {}
double val_real();
longlong val_int();
String *val_str(String *str);
void fix_length_and_dec();
const char *func_name() const { return "elt"; }
};
class Item_func_make_set :public Item_str_func
{
Item *item;
String tmp_str;
public:
Item_func_make_set(Item *a,List<Item> &list) :Item_str_func(list),item(a) {}
String *val_str(String *str);
bool fix_fields(THD *thd, Item **ref)
{
DBUG_ASSERT(fixed == 0);
bool res= ((!item->fixed && item->fix_fields(thd, &item)) ||
item->check_cols(1) ||
Item_func::fix_fields(thd, ref));
maybe_null|= item->maybe_null;
return res;
}
void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array,
List<Item> &fields);
void fix_length_and_dec();
void update_used_tables();
const char *func_name() const { return "make_set"; }
bool walk(Item_processor processor, bool walk_subquery, uchar *arg)
{
return item->walk(processor, walk_subquery, arg) ||
Item_str_func::walk(processor, walk_subquery, arg);
}
Item *transform(Item_transformer transformer, uchar *arg);
virtual void print(String *str, enum_query_type query_type);
};
class Item_func_format :public Item_str_ascii_func
{
String tmp_str;
MY_LOCALE *locale;
public:
Item_func_format(Item *org, Item *dec): Item_str_ascii_func(org, dec) {}
Item_func_format(Item *org, Item *dec, Item *lang):
Item_str_ascii_func(org, dec, lang) {}
MY_LOCALE *get_locale(Item *item);
String *val_str_ascii(String *);
void fix_length_and_dec();
const char *func_name() const { return "format"; }
virtual void print(String *str, enum_query_type query_type);
};
class Item_func_char :public Item_str_func
{
public:
Item_func_char(List<Item> &list) :Item_str_func(list)
{ collation.set(&my_charset_bin); }
Item_func_char(List<Item> &list, const CHARSET_INFO *cs) :
Item_str_func(list)
{ collation.set(cs); }
String *val_str(String *);
void fix_length_and_dec()
{
max_length= arg_count * 4;
}
const char *func_name() const { return "char"; }
};
class Item_func_repeat :public Item_str_func
{
String tmp_value;
public:
Item_func_repeat(Item *arg1,Item *arg2) :Item_str_func(arg1,arg2) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "repeat"; }
};
class Item_func_space :public Item_str_func
{
public:
Item_func_space(Item *arg1):Item_str_func(arg1) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "space"; }
};
class Item_func_rpad :public Item_str_func
{
String tmp_value, rpad_str;
public:
Item_func_rpad(Item *arg1,Item *arg2,Item *arg3)
:Item_str_func(arg1,arg2,arg3) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "rpad"; }
};
class Item_func_lpad :public Item_str_func
{
String tmp_value, lpad_str;
public:
Item_func_lpad(Item *arg1,Item *arg2,Item *arg3)
:Item_str_func(arg1,arg2,arg3) {}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "lpad"; }
};
class Item_func_conv :public Item_str_func
{
public:
Item_func_conv(Item *a,Item *b,Item *c) :Item_str_func(a,b,c) {}
const char *func_name() const { return "conv"; }
String *val_str(String *);
void fix_length_and_dec()
{
collation.set(default_charset());
max_length=64;
maybe_null= 1;
}
};
class Item_func_hex :public Item_str_ascii_func
{
String tmp_value;
public:
Item_func_hex(Item *a) :Item_str_ascii_func(a) {}
const char *func_name() const { return "hex"; }
String *val_str_ascii(String *);
void fix_length_and_dec()
{
collation.set(default_charset());
decimals=0;
fix_char_length(args[0]->max_length * 2);
}
};
class Item_func_unhex :public Item_str_func
{
String tmp_value;
public:
Item_func_unhex(Item *a) :Item_str_func(a)
{
/* there can be bad hex strings */
maybe_null= 1;
}
const char *func_name() const { return "unhex"; }
String *val_str(String *);
void fix_length_and_dec()
{
collation.set(&my_charset_bin);
decimals=0;
max_length=(1+args[0]->max_length)/2;
}
};
#ifndef DBUG_OFF
class Item_func_like_range :public Item_str_func
{
protected:
String min_str;
String max_str;
const bool is_min;
public:
Item_func_like_range(Item *a, Item *b, bool is_min_arg)
:Item_str_func(a, b), is_min(is_min_arg)
{ maybe_null= 1; }
String *val_str(String *);
void fix_length_and_dec()
{
collation.set(args[0]->collation);
decimals=0;
max_length= MAX_BLOB_WIDTH;
}
};
class Item_func_like_range_min :public Item_func_like_range
{
public:
Item_func_like_range_min(Item *a, Item *b)
:Item_func_like_range(a, b, true) { }
const char *func_name() const { return "like_range_min"; }
};
class Item_func_like_range_max :public Item_func_like_range
{
public:
Item_func_like_range_max(Item *a, Item *b)
:Item_func_like_range(a, b, false) { }
const char *func_name() const { return "like_range_max"; }
};
#endif
class Item_char_typecast :public Item_str_func
{
int cast_length;
const CHARSET_INFO *cast_cs, *from_cs;
bool charset_conversion;
String tmp_value;
public:
Item_char_typecast(Item *a, int length_arg, const CHARSET_INFO *cs_arg)
:Item_str_func(a), cast_length(length_arg), cast_cs(cs_arg) {}
enum Functype functype() const { return CHAR_TYPECAST_FUNC; }
bool eq(const Item *item, bool binary_cmp) const;
const char *func_name() const { return "cast_as_char"; }
String *val_str(String *a);
void fix_length_and_dec();
virtual void print(String *str, enum_query_type query_type);
};
class Item_func_binary :public Item_str_func
{
public:
Item_func_binary(Item *a) :Item_str_func(a) {}
String *val_str(String *a)
{
DBUG_ASSERT(fixed == 1);
String *tmp=args[0]->val_str(a);
null_value=args[0]->null_value;
if (tmp)
tmp->set_charset(&my_charset_bin);
return tmp;
}
void fix_length_and_dec()
{
collation.set(&my_charset_bin);
max_length=args[0]->max_length;
}
virtual void print(String *str, enum_query_type query_type);
const char *func_name() const { return "cast_as_binary"; }
};
class Item_load_file :public Item_str_func
{
String tmp_value;
public:
Item_load_file(Item *a) :Item_str_func(a) {}
String *val_str(String *);
const char *func_name() const { return "load_file"; }
void fix_length_and_dec()
{
collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
maybe_null=1;
max_length=MAX_BLOB_WIDTH;
}
};
class Item_func_export_set: public Item_str_func
{
public:
Item_func_export_set(Item *a,Item *b,Item* c) :Item_str_func(a,b,c) {}
Item_func_export_set(Item *a,Item *b,Item* c,Item* d) :Item_str_func(a,b,c,d) {}
Item_func_export_set(Item *a,Item *b,Item* c,Item* d,Item* e) :Item_str_func(a,b,c,d,e) {}
String *val_str(String *str);
void fix_length_and_dec();
const char *func_name() const { return "export_set"; }
};
class Item_func_quote :public Item_str_func
{
String tmp_value;
public:
Item_func_quote(Item *a) :Item_str_func(a) {}
const char *func_name() const { return "quote"; }
String *val_str(String *);
void fix_length_and_dec()
{
collation.set(args[0]->collation);
ulong max_result_length= (ulong) args[0]->max_length * 2 +
2 * collation.collation->mbmaxlen;
max_length= std::min<ulong>(max_result_length, MAX_BLOB_WIDTH);
}
};
class Item_func_conv_charset :public Item_str_func
{
bool use_cached_value;
String tmp_value;
public:
bool safe;
const CHARSET_INFO *conv_charset; // keep it public
Item_func_conv_charset(Item *a, const CHARSET_INFO *cs) :Item_str_func(a)
{ conv_charset= cs; use_cached_value= 0; safe= 0; }
Item_func_conv_charset(Item *a, const CHARSET_INFO *cs,
bool cache_if_const) :Item_str_func(a)
{
DBUG_ASSERT(args[0]->fixed);
conv_charset= cs;
if (cache_if_const && args[0]->const_item())
{
uint errors= 0;
String tmp, *str= args[0]->val_str(&tmp);
if (!str || str_value.copy(str->ptr(), str->length(),
str->charset(), conv_charset, &errors))
null_value= 1;
use_cached_value= 1;
str_value.mark_as_const();
safe= (errors == 0);
}
else
{
use_cached_value= 0;
/*
Conversion from and to "binary" is safe.
Conversion to Unicode is safe.
Other kind of conversions are potentially lossy.
*/
safe= (args[0]->collation.collation == &my_charset_bin ||
cs == &my_charset_bin ||
(cs->state & MY_CS_UNICODE));
}
}
String *val_str(String *);
void fix_length_and_dec();
const char *func_name() const { return "convert"; }
virtual void print(String *str, enum_query_type query_type);
};
class Item_func_set_collation :public Item_str_func
{
public:
Item_func_set_collation(Item *a, Item *b) :Item_str_func(a,b) {};
String *val_str(String *);
void fix_length_and_dec();
bool eq(const Item *item, bool binary_cmp) const;
const char *func_name() const { return "collate"; }
enum Functype functype() const { return COLLATE_FUNC; }
virtual void print(String *str, enum_query_type query_type);
Item_field *field_for_view_update()
{
/* this function is transparent for view updating */
return args[0]->field_for_view_update();
}
};
class Item_func_charset :public Item_str_func
{
public:
Item_func_charset(Item *a) :Item_str_func(a) {}
String *val_str(String *);
const char *func_name() const { return "charset"; }
void fix_length_and_dec()
{
collation.set(system_charset_info);
max_length= 64 * collation.collation->mbmaxlen; // should be enough
maybe_null= 0;
};
table_map not_null_tables() const { return 0; }
};
class Item_func_collation :public Item_str_func
{
public:
Item_func_collation(Item *a) :Item_str_func(a) {}
String *val_str(String *);
const char *func_name() const { return "collation"; }
void fix_length_and_dec()
{
collation.set(system_charset_info);
max_length= 64 * collation.collation->mbmaxlen; // should be enough
maybe_null= 0;
};
table_map not_null_tables() const { return 0; }
};
class Item_func_weight_string :public Item_str_func
{
String tmp_value;
uint flags;
uint nweights;
uint result_length;
Field *field;
public:
Item_func_weight_string(Item *a, uint result_length_arg,
uint nweights_arg, uint flags_arg)
:Item_str_func(a), field(NULL)
{
nweights= nweights_arg;
flags= flags_arg;
result_length= result_length_arg;
}
const char *func_name() const { return "weight_string"; }
String *val_str(String *);
void fix_length_and_dec();
};
class Item_func_crc32 :public Item_int_func
{
String value;
public:
Item_func_crc32(Item *a) :Item_int_func(a) { unsigned_flag= 1; }
const char *func_name() const { return "crc32"; }
void fix_length_and_dec() { max_length=10; }
longlong val_int();
};
class Item_func_uncompressed_length : public Item_int_func
{
String value;