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Now this syntax works too: CONVERT(string,charset_to,charset_from)

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where charset_to and charset_from are expressions. For example:

CONVERT('test','latin2','cp1250')
This commit is contained in:
bar@gw.udmsearch.izhnet.ru
2002-03-29 19:11:06 +04:00
parent ae03ccc403
commit 648bd2788a
3 changed files with 87 additions and 0 deletions
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73
sql/item_strfunc.cc
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@@ -1843,6 +1843,79 @@ void Item_func_conv_charset::fix_length_and_dec()
/* BAR TODO: What to do here??? */
}
String *Item_func_conv_charset3::val_str(String *str)
{
my_wc_t wc;
int cnvres;
const uchar *s, *se;
uchar *d, *d0, *de;
uint dmaxlen;
String *arg= args[0]->val_str(str);
String *to_cs= args[1]->val_str(str);
String *from_cs= args[2]->val_str(str);
CHARSET_INFO *from_charset;
CHARSET_INFO *to_charset;
if (!arg || args[0]->null_value ||
!to_cs || args[1]->null_value ||
!from_cs || args[2]->null_value ||
!(from_charset=find_compiled_charset_by_name(from_cs->ptr())) ||
!(to_charset=find_compiled_charset_by_name(to_cs->ptr())))
{
null_value=1;
return 0;
}
s=(const uchar*)arg->ptr();
se=s+arg->length();
dmaxlen=arg->length()*(to_charset->mbmaxlen?to_charset->mbmaxlen:1)+1;
str->alloc(dmaxlen);
d0=d=(unsigned char*)str->ptr();
de=d+dmaxlen;
while( s < se && d < de){
cnvres=from_charset->mb_wc(from_charset,&wc,s,se);
if (cnvres>0)
{
s+=cnvres;
}
else if (cnvres==MY_CS_ILSEQ)
{
s++;
wc='?';
}
else
break;
outp:
cnvres=to_charset->wc_mb(to_charset,wc,d,de);
if (cnvres>0)
{
d+=cnvres;
}
else if (cnvres==MY_CS_ILUNI && wc!='?')
{
wc='?';
goto outp;
}
else
break;
};
str->length((uint) (d-d0));
str->set_charset(to_charset);
return str;
}
void Item_func_conv_charset3::fix_length_and_dec()
{
/* BAR TODO: What to do here??? */
}
String *Item_func_hex::val_str(String *str)
{
if (args[0]->result_type() != STRING_RESULT)