1,如果表不存在就新建一个
CComBSTR bstrCreatBat(L”CREATE TABLE IF NOT EXISTS tb_Name (\
rowIdIndex INTEGER PRIMARY KEY ASC AUTOINCREMENT,\
richContent TEXT,\
type INTEGER,\
userId INTEGER\
);”);
2,查询表是否存在
swprintf (buffexist, 511, L”SELECT COUNT(*) AS existence FROM sqlite_master WHERE type = ‘table’ and name = ‘%s';”,m_strTbName);
3,查询行数
swprintf(StrSQLCount, 1023,L”select count(*) as sum from %s where userId = %I64d and subUserId = %I64d ;” ,
m_strTbName, userid, subid);
4,查询第m条到n条的数据
swprintf (StrSQL, 1023,
L”select * from %s where userId = %I64d and subUserId = %I64d order by sysTime limit %d, %d ;”,
m_strTbName, userid, subid, (iPage-1)*COUNT_ON_A_PAGE, COUNT_ON_A_PAGE);
5,查询id值最小的一条数据
swprintf (StrSQL, 1023,
L”select * from %s where id in (select min(id) from %s group by userid , subUserId) ;”,
m_strTbName, m_strTbName);