本文整理汇总了C++中value::newval方法的典型用法代码示例。如果您正苦于以下问题：C++ value::newval方法的具体用法？C++ value::newval怎么用？C++ value::newval使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类value的用法示例。
在下文中一共展示了value::newval方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: query
bool sqlitehandle::query (const string &sql, value &into,
const statstring &indexby)
{
sqlite3_stmt *qhandle;
int qres;
int rowcount=0;
int colcount;
int i;
statstring curidx;
bool done = false;
into.clear ();
if (sqlite3_prepare (hdl, sql.str(), sql.strlen(), &qhandle, 0) != SQLITE_OK)
{
errcode = 1;
errstr = "Could not prepare: %s" %format (sqlite3_errmsg(hdl));
return false;
}
if (! (qres = sqlite3_step (qhandle)))
{
errcode = 1;
errstr = "Error making first step: %s" %format (sqlite3_errmsg(hdl));
sqlite3_finalize (qhandle);
return false;
}
colcount = sqlite3_column_count (qhandle);
if (colcount == 0)
{
into("rowschanged") = sqlite3_changes (hdl);
sqlite3_finalize (qhandle);
return true;
}
statstring colnames[colcount];
value colidx;
for (i=0; i<colcount; ++i)
{
colnames[i] = sqlite3_column_name (qhandle, i);
colidx[colnames[i]] = i;
}
int indexfield = -1;
if (colidx.exists (indexby)) indexfield = colidx[indexby];
if (! done) do
{
switch (qres)
{
case SQLITE_BUSY:
sleep (1);
sqlite3_reset(qhandle);
continue;
case SQLITE_MISUSE: // achtung, fallthrough
case SQLITE_ERROR:
errcode = 1;
errstr = "Error in sqlite3_step: %s" %format (sqlite3_errmsg(hdl));
done = true;
break;
case SQLITE_DONE:
done = true;
break;
case SQLITE_ROW:
{
if (indexfield>=0)
{
curidx = sqlite3_column_text (qhandle, indexfield);
}
value &myrow = (indexfield<0) ? into.newval() : into[curidx];
for (int i=0; i<colcount; i++)
{
int ctype = sqlite3_column_type (qhandle, i);
statstring &curcol = colnames[i];
switch (ctype)
{
case SQLITE_INTEGER:
myrow[curcol] = sqlite3_column_int (qhandle, i);
break;
case SQLITE_FLOAT:
myrow[curcol] = sqlite3_column_double (qhandle, i);
break;
case SQLITE_BLOB:
// FIXME: use sqlite3_column_blob
case SQLITE_TEXT:
myrow[curcol] = sqlite3_column_text (qhandle, i);
break;
default:
break;
//.........这里部分代码省略.........