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AppBuilder中进行直接ODBC API数据库调用访问的基本方法!(2)
SQLConnectde的返回码是：
SQL-SUCCESS
SQL-SUCCESS-WITH-INFO
SQL-ERROR
SQL-INVALID-NUMBER
与数据源断开
应用系统一旦使用完成一个数据源连接，便应与之断开。连接是十分昂贵
的资源，因为很多DBMS对同时连接的每一个许可人员或用户都是收费的。当
连接完成时，应当把它返回，以便其它用户能注册进入该系统。下面描述的ODBC
函数SQLDisconnect处理这一操作过程。
SQLDisconnect关闭与指定的连接句柄相关的数据源连接。SQLDisconnect
的语法如下：
RETCODESQLDisconnect（hdbc）
SQLDisconnect的返回码是：
SQL-SUCCESS
SQL-SUCCESS-WITH-INFO
SQL-ERROR
SQL-INVALID-HANDLE
如果数据源连接成功的话，就可以继续下一步；
CString strSQLString;
RETCODE ReturnCode;
SQLHSTMThstmt;
if (SQL_SUCCESS != SQLAllocHandle(SQL_HANDLE_STMT,theApp.m_hdbc,&hstmt))
return;
strSQLString.Format(
"SELECT "
"NID,"
"ARIQI,"
"NJINE,"
"ASHUOMING,"
"ALAIYUAN,"
"ACUNZHE,"
"AYONGTU,"
"AXIAOFEI,"
"ABEIZHU"
" FROM HHZhiChu "
" WHERE NID=%u",
nID);
if (SQL_SUCCESS == (ReturnCode = SQLExecDirect(hstmt,(UCHAR*)((LPCTSTR)strSQLString),SQL_NTS)))
{
SQLBindCol(hstmt,1,SQL_C_SLONG,&dbdata.m_Nid,0,&cb);
SQLBindCol(hstmt,2,SQL_C_TIMESTAMP,&dbdata.m_Ariqi,0,&cb);
SQLBindCol(hstmt,3,SQL_C_DOUBLE,&dbdata.m_Njine,0,&cb);
SQLBindCol(hstmt,4,SQL_C_CHAR,dbdata.m_Ashuoming,HHZhiChu_aShuoMing_SIZE,&cb);
SQLBindCol(hstmt,5,SQL_C_CHAR,dbdata.m_Alaiyuan,HHZhiChu_aLaiYuan_SIZE,&cb);
SQLBindCol(hstmt,6,SQL_C_CHAR,dbdata.m_Acunzhe,HHZhiChu_aCunZhe_SIZE,&cb);
SQLBindCol(hstmt,7,SQL_C_CHAR,dbdata.m_Ayongtu,HHZhiChu_aYongTu_SIZE,&cb);
SQLBindCol(hstmt,8,SQL_C_CHAR,dbdata.m_Axiaofei,HHZhiChu_aXiaoFei_SIZE,&cb);
SQLBindCol(hstmt,9,SQL_C_CHAR,dbdata.m_Abeizhu,HHZhiChu_aBeiZhu_SIZE,&cb);
if (SQL_SUCCESS == (ReturnCode = SQLFetch(hstmt)))
{
//读数据成功，可一对数据进行处理了。
}
}
::SQLFreeHandle(SQL_HANDLE_STMT,hstmt);
程序完了后要关闭数据库，
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