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(PHP 4 >= 4.0.6, PECL yaz >= 0.9.0)
yaz_database — Specifies the databases within a session
$id 
   ,  string $databases 
   )This function allows you to change databases within a session by specifying one or more databases to be used in search, retrieval, etc. - overriding databases specified in call to yaz_connect() .
id The connection resource returned by yaz_connect() .
databases A string containing one or more databases. Multiple databases are separated by a plus sign +.
   成功时返回  TRUE , 或者在失败时返回  FALSE 。