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PHP : Function Reference : Sybase Functions : sybase_select_db

sybase_select_db

Selects a Sybase database (PHP 4, PHP 5)
bool sybase_select_db ( string database_name [, resource link_identifier] )


Code Examples / Notes » sybase_select_db

verdy_p

Using this function is not required under Sybase, because Sybase SQL Server users can be configured with a default database to use at connection time. You only need this function if your SQL Server has multiple database names, and you want to switch your queries from one database to another one on the same SQLServer, for example if the connection user name has "master" as its default database name and you want to process queries in your application database, or if the username (in fact the loginname in Sybase terminology) has an application database configured for its default database, and you want to process some queries in the "master", "tempdb", or "sybsystemprocs" database.
When you call this function, and it returns successfully, the "username" parameter in the sybase_connect or sybase_pconnect function calls is NOT the user name that holds the access rights in that database. In fact, the "username" is used by Sybase only as a loginname for the SQL Server, and it is mapped to a database-specific username according to the contents of the database sysusers system table that maps logins to database users. Many databases only have a "dbo" username, whatever the loginname you configured on the server's "master" database; in that case to the database is specified by the default servername for the specified loginname, and the access rights are determined by the database's map in sysusers system table which specifies with login is associated with the "dbo" user. You may elect to configure another user in your application database, with limited granted rights, and then add a new server login with a specific password and this database as its default database to use. Such a configuration will add an extra level of security for your database, avoiding full privileges (thus forbidding alteration of the database schema by PHP3 scripts). You may also give strict grants with select-only access rights to the new user, so that PHP3 will only be able to select data from the database, but won't be granted to modify the database contents.


jayne dot westall

Sybase generates the following warning whenever you change databases.
Sybase: Server message: Changed database context to 'databasename'.
Suppress the message by prefixing sybase_connect and sybase_select_db with an @ sign.


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sybase_affected_rows
sybase_close
sybase_connect
sybase_data_seek
sybase_deadlock_retry_count
sybase_fetch_array
sybase_fetch_assoc
sybase_fetch_field
sybase_fetch_object
sybase_fetch_row
sybase_field_seek
sybase_free_result
sybase_get_last_message
sybase_min_client_severity
sybase_min_error_severity
sybase_min_message_severity
sybase_min_server_severity
sybase_num_fields
sybase_num_rows
sybase_pconnect
sybase_query
sybase_result
sybase_select_db
sybase_set_message_handler
sybase_unbuffered_query
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