SQLite数据库使用like模糊查询中文问题

1.首先查看sqlite编码

PRAGMA encoding;

2.编写UTF-8与BG2312转换函数

//UTF-8到GB2312的转换
char* U2G(const char* utf8)
{
int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
wchar_t* wstr = new wchar_t[len+1];
memset(wstr, 0, len+1);
MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len);
len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
char* str = new char[len+1];
memset(str, 0, len+1);
WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, len, NULL, NULL);
if(wstr) delete[] wstr;
return str;
}

//GB2312到UTF-8的转换
char* G2U(const char* gb2312)
{
int len = MultiByteToWideChar(CP_ACP, 0, gb2312, -1, NULL, 0);
wchar_t* wstr = new wchar_t[len+1];
memset(wstr, 0, len+1);
MultiByteToWideChar(CP_ACP, 0, gb2312, -1, wstr, len);
len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);
char* str = new char[len+1];
memset(str, 0, len+1);
WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, len, NULL, NULL);
if(wstr) delete[] wstr;
return str;
}

3.编写数据导入函数

bool AddData2LocalDb(CString strAdd)//strAdd为导入的数据
{
   CString strTemp;
   strTemp.Format(_T("INSERT INTO store VALUES(%s)"),strAdd);
   int nLength = strTemp.GetLength();
   int nBytes = WideCharToMultiByte(CP_ACP,0,strTemp,nLength,NULL,0,NULL,NULL);
   char *p = new char[ nBytes + 1];
   memset(p,0,nLength + 1);
   WideCharToMultiByte(CP_OEMCP, 0, strTemp, nLength, p, nBytes, NULL, NULL);
   p[nBytes] = 0;

   p=G2U(p);
   if (sqlite3_exec (conn, p, NULL, NULL, &err_msg) != SQLITE_OK)
   {
       TRACE (_T("操作失败，错误代码：%s\n"), err_msg);
       strErr.Format(_T("操作失败，错误代码：%s"),err_msg);
       sqlite3_free(err_msg);
       return false;
   }
   return true;
}

4.编写like查询函数

strIn=输入的查询条件

strInfo=输出的查询到的数据

bool CtestmysqlDlg::LocalReadInfo_like(CString strIn,CString &strInfo)
{
   CString strTemp;
   strTemp.Format(_T("select *from Store where index1 like '%%%s%%'"),strIn);
   nLength = strTemp.GetLength();
   nBytes = WideCharToMultiByte(CP_ACP,0,strTemp,nLength,NULL,0,NULL,NULL);
   p = new char[ nBytes + 1];
   memset(p,0,nLength + 1);
   WideCharToMultiByte(CP_OEMCP, 0, strTemp, nLength, p, nBytes, NULL, NULL);
   p[nBytes] = 0;
   stmt=NULL;
   p=G2U(p);
   if (SQLITE_OK!=sqlite3_prepare_v2(conn,p,strlen(p),&stmt,NULL))
   {
       if(stmt)
       {
           sqlite3_finalize(stmt);
       }
       sqlite3_close(conn);
       TRACE(_T("操作失败，错误代码：%s\n"), err_msg);
       sqlite3_free(err_msg);
       return false;
   }
   filedCount=sqlite3_column_count(stmt);
   do
   {
       CString strText=_T("");
       int r=sqlite3_step(stmt);
       if(r==SQLITE_ROW)
       {
           for (int i=0;i<filedCount;i++)
           {
               const char* v = (const char*)sqlite3_column_text(stmt,i);
               v=U2G(v);
               CString strTemp0(v);
               if (filedCount==filedCount-1)
               {
                   strTemp0+=_T("&");
               }
               else
               {
                   strTemp0+=_T("$");
               }

               strText=strText+strTemp0;
           }
           strInfo=strInfo+strText;

       }
       else if (r == SQLITE_DONE)
       {

TRACE(_T("Select Finished.n"));

break;

       }
       else
       {
           sqlite3_finalize(stmt);

sqlite3_close(conn);

return false;
}

}while (1);
return true;
}

SQLite数据库使用like模糊查询中文问题

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