调用sqlite3_open函数默认创建的数据库encoding=UTF-8，执行sqlite3_exec时需要将对应的字符串转换为UTF-8格式多字节字符串。比如：

sqlite3* db;
auto retVal = sqlite3_open("test.db",&db);
char* pErrMsg;
auto sql = "create table users(userid varchar(20) PRIMARY KEY,name varchar(50),age int,birthday datetime);";
retVal = sqlite3_exec(db,sql,&pErrMsg);
auto sql2 = _T("insert into users values('administrator','管理员',20,'2000-1-1');");
retVal = sqlite3_exec(db,CW2A(sql2,CP_UTF8),&pErrMsg);

返回结果同样需要转换回来：

Cppsqlite3DB db;
db.open("test.db");

string sql = CW2A(_T("select * from users where name like '李%';"),CP_UTF8);
auto query = db.execQuery(sql.c_str());

while (!query.eof())
{
    auto name = query.fieldValue("name");
    wstring name2 = CA2W(name,CP_UTF8);

    query.nextRow();
}

原文链接