如何通过ADO使用聚合函数来查询(数据库为ACCESS)
_RecordsetPtr CMyAdo::SelectRecord(string &where, string &tablename,string &field, int way )
{
int ret = 0;
_RecordsetPtr pset;
CString sql;
VARIANT count;
count.vt = VT_INT;
ret = OpenDB();
if( ret == 1 )
return -1; //创建对象失败
else if( ret == 2 )
return -2; //数据库打开失败
try
{
sql.Format("select count(*) from %s", tablename.c_str() );
/*if( way == 0 ) //查询全部
{
sql.Format("select * from %s", tablename.c_str() );
TRACE("sql = %s\n",sql);
}
else if( way == 1 ) //按字段查询
sql.Format("select %s from %s", field.c_str(), tablename.c_str() );
else if( way == 2 ) //按条件全部查询
{
}
else if( way == 3 ) //按条件和字段联合查询
{
}*/
pset = m_dbptr->Execute((_bstr_t)sql.GetBuffer(sql.GetLength()),&count,adCmdUnknown);
if( pset != NULL && !pset->ADOEOF )
retu
相关问答：
我有一个Units表,结构为:
ID UnistsName
UN1 黑龙江东方学院
UN2 ......
sql语句是这样写得
string sql = "select * from shophistory where username(string类型) like '%"+ name +"%' ";
结果运行报错：(操作符丢失) 在查询表达式 说后 ......
m_pConnect->BeginTrans();
strSql.Format("CREATE TABLE SysUser(lsh AUTOINCREMENT NOT NULL UNIQUE,PRIMARY KEY(lsh),userType BYTE)");
m_pConnect->Execute((_bstr_t)strSql,NULL, adExe ......
SQL code:
select count(1) from HouseList a left join MemberList b on
(a.OperationName=b.UName and a.Eid=1 and a.houselc='2')
以上这条语句在sql2005中查询得到760条记录,放在access中查询只有14� ......
