How insert unicode string into sqllite in c++? - sqlite

Question

I used
sqlite3_open16(v_st,&m_db)//SQLITE_OK
I want to insert unicode string.
Example:
sqlite3_exec(m_db,"UPDATE t1 SET a1='text'",0,0,0); //is good
but
sqlite3_exec(m_db,"UPDATE t1 SET a1='текст'",0,0,0); //is bad

Answer 1

When you use the sqlite3_open16 function you open the DB with the UTF-16 encoding.
And when you use the sqlite3_exec(m_db,"UPDATE t1 SET a1='текст'",0,0,0) function you use the encoding of your compiler (UTF-8 by default or cp1251).
You should use the same encoding in both cases. You may do one of theese things:
1) use the sqlite3_open function to open it with UTF-8 encoding and enshure your compiler uses UTF-8 as well;
or
2) change your compiler encoding to UTF-16;
or
3) use the sql statement PRAGMA encoding = "UTF-8"

Answer 2

string ANSItoUTF16le(const char* v_str)
{
string t_res;
unsigned char* t_buf=(unsigned char*)v_str;
auto t_size=strlen(v_str);
unsigned char t_s='А',t_f='п',t_E='Ё',t_e='Ё',t2_s='р',t2_f='я';
unsigned char t_c;
for(auto i=0;i<t_size;i++)
{
if(t_buf[i]>=t_s&&t_buf[i]<=t_f)
{
t_res+='\xD0';
t_c='\x90'+t_buf[i]-t_s;
t_res+=t_c;
continue;
}
if(t_buf[i]>=t2_s&&t_buf[i]<=t2_f)
{
t_res+='\xD1';
t_c='\x80'+t_buf[i]-t2_s;
t_res+=t_c;
continue;
}
if(t_buf[i]==t_E)
{
t_res+="\xD0\x01";
continue;
}
if(t_buf[i]==t_e)
{
t_res+="\xD1\x91";
continue;
}
t_res+=v_str[i];
}
return t_res;
}
and
sqlite3_exec(m_db,ANSItoUTF16le("UPDATE t1 SET a1='текст'").c_str(),0,0,0);

Answer 3

You can insert unicode string into sqllite in c++ by using a wrapper class on top of sqlite3.
CppSqlite3U is a unicode wrapper around the SQLite database. It allows using UNICODE types, such as wchar_t (instead of char), or It can be downloaded from here. also described in this article. For example: a query executed by execQuery can be of a LPCTSTR type, meaning that it can be either an array of wide chars or chars depending on whether UNICODE is defined in your project.
CppSQLite3Query execQuery(LPCTSTR szSQL);