请问 ODBC 跟 dbopen() 的关系

[2ndboy]

看到一个 ODBC 的教程上说要用 SQLAllocHandle() 这一族函数，可是又看到有 dbopen() 这么一族函数，那么 dbopen() 跟 ODBC 有什么关系呢？SQLAllocHandle()　呢？

最好详细一些，我对数据库的概念很弱，谢谢！

[cool_ice]

下面是msdn中的解释：
dbopen
Allocates and initializes a DBPROCESS connection structure.

Syntax
PDBPROCESS dbopen (
PLOGINREC login,
LPCSTR servername );

Arguments
login

Is a pointer to a LOGINREC structure. You can get one by calling dblogin.

servername

Is the name of the server running Microsoft® SQL Server™ 2000 to connect to. This parameter can be the name of an actual SQL Server, NULL or a null string to connect to a local SQL Server, or the logical name matching an entry in the Win.ini file or the Microsoft Windows NT® 4.0 Registry.

Returns
A DBPROCESS pointer if everything is correct. Ordinarily, NULL is returned if a DBPROCESS structure could not be created or initialized, or if your login to SQL Server failed. When NULL is returned, the user-supplied error handler is called to indicate the error.
注释:
The DBPROCESS structure is the basic data structure that DB-Library uses to communicate with SQL Server. The application needs a DBPROCESS structure to communicate with SQL Server. It is the first parameter in almost every DB-Library call. Besides allocating the DBPROCESS structure, this function sets up communication with the network, logs in to SQL Server, and initializes any default options.

用法:
DBPROCESS *dbproc;
LOGINREC *loginrec;

loginrec = dblogin();
DBSETLUSER(loginrec, "user");
DBSETLPWD(loginrec, "my_password");
DBSETLAPP(loginrec, "my_program");
dbproc = dbopen(loginrec, "my_server");

我的理解是dbopen是sqlserver odbc的专用api!

[cool_ice]

logs in to SQL Server, and initializes any default options.说明它是用于sql server的

[shiyongfan]

dbopen是SQLSERVER 的DB-LIBRARY编程接口是的一个函数。
这个编程接口是用来直接和数据库服务器相连的。不通过
ODBC。这个编程接口也不ODBC的专用API。它是SQLSERVER
的API。用它编程很麻烦，比ODBCAPI还要麻烦。

各种数据库都有自己的C接口，MySQL也有。