mysql中的mysql_real_connect连接参数设置

在前一篇文章中，讲述了如何进行MySQL源程序代码的编译链接，但是没有讲述运行情况，在按照上一篇文章代码下进行编译运行后，发现无法链接数据库文件，显然是在mysql_real_connect（）函数中出现了问题。在mysql的英文手册中找到关于mysql_real_connect()的如下描述：
     
//函数原型描述 MYSQL *mysql_real_connect(MYSQL *mysql, const char *host, const char *user,
const char *passwd, const char *db, unsigned int port, const char *unix_socket,
unsigned long client_flag)

Description

mysql_real_connect() attempts to establish a connection to a MySQL database engine
running on host. mysql_real_connect() must complete successfully before you can
execute any other API functions that require a valid MYSQL connection handle structure.

The parameters are specified as follows:

    *

      The first parameter should be the address of an existing MYSQL structure. Before
 calling mysql_real_connect() you must call mysql_init() to initialize the MYSQL
structure. You can change a lot of connect options with the mysql_options() call.
See Section 17.2.3.47, “mysql_options()”.
    *

      The value of host may be either a hostname or an IP address. If host is NULL or the
string "localhost", a connection to the local host is assumed. If the OS supports sockets
(Unix) or named pipes (Windows), they are used instead of TCP/IP to connect to the server.
    *

      The user parameter contains the user''s MySQL login ID. If user is NULL or the empty
string "", the current user is assumed. Under Unix, this is the current login name. Under
 Windows ODBC, the current username must be specified explicitly. See Section 18.1.9.2,
 Â“Configuring a MyODBC DSN on Windows”.
    *

      The passwd parameter contains the passWord for user. If passwd is NULL, only entries
 in the user

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