SQL组句方法

if(!sQuery.IsEmpty())
{
SQL+="where InsCode='"+sQuery+"'";
}
if(!sProvider.IsEmpty())
{
if(SQL.Pos("where")!=0)
{
SQL+=" and Provider='"+sProvider+"'";
}
else
{
SQL+=" where Provider='"+sProvider+"'";
}
}

AnsiString SQL = "select * from TEV_Stock_In where 1=1 ";
if(RzComboBox2->ItemIndex==1)
{
sQuery = GetInsCodeByHelpSign(sQuery);
}

if(!sQuery.IsEmpty())
{
SQL+=" and InsCode='"+sQuery+"'";
}
if(!sProvider.IsEmpty())
{
SQL+=" and Provider='"+sProvider+"'";
}