mysql中的mysql_real_connect连接参数设置

    *

      For host, specify a value of NULL or the empty string ("").
    *

      For user, specify a value of NULL or the empty string.
    *

      For passwd, specify a value of NULL. (For the password, a value of the empty string in
 the mysql_real_connect() call cannot be overridden in an option file, because the empty
string indicates explicitly that the MySQL account must have an empty password.)
    *

      For db, specify a value of NULL or the empty string.
    *

      For port, specify a value of 0.
    *

      For unix_socket, specify a value of NULL.

If no value is found in an option file for a parameter, its default value is used as
indicated in the descriptions given earlier in this section.

Return Values

A MYSQL* connection handle if the connection was successful, NULL if the connection
was unsuccessful. For a successful connection, the return value is the same as the value
of the first parameter.
// 返回值：当连接成功时，返回MYSQL连接句柄，失败，返回NULL。当成功时，返回值与第一个参数值是// 相同的。

Errors

    *

      CR_CONN_HOST_ERROR

      Failed to connect to the MySQL server.
    *

      CR_CONNECTION_ERROR

      Failed to connect to the local MySQL server.
    *

      CR_IPSOCK_ERROR

      Failed to create an IP socket.
    *

      CR_OUT_OF_MEMORY

      Out o

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