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177 lines
6.3 KiB
Plaintext
177 lines
6.3 KiB
Plaintext
==== About This Module ===
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PostgreSQL module provides access to PostgreSQL server from
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PHP script. This module uses PostgreSQL C client lib called libpq.
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It is important that you use libpq that is later than backend
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(PostgreSQL Server) version. Otherwise, you may experience
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strange problems.
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Please send e-mail to yohgaki@php.net if you have comments for
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pgsql module. I appreciate your feedback.
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==== API Change ===
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Older PHP than 4.2.0, pg_loimport()/pg_loexport() connection
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parameter as last parameter, not like other functions. From 4.2.0,
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connection parameter became 1st parameter. Old syntax is preserved,
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but it will raise NOTICE error message.
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pg_connect()/pg_pconnect() has obsolete multi parameter syntax.
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This syntax will be deleted in 4.3.0 or later.
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Omitting connectin parameter is NOT recommended. Connection
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parameter may be required for future PHP version. Specify connection
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always if you don't want to rewrite code when it is changed.
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==== Function Name Change ====
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Function names are going to be changed to confirm coding
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standard. MySQL module has been done this already. Function names will
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be changed as follows.
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pg_errormessage -> pg_error_message
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pg_cmdtuples -> pg_affected_rows
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pg_fieldnum -> pg_field_num
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and so on. Except pg_cmdtuples, under scores '_' will be added to
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names.
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Older names will become aliases of new functions for backward
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compatibility.
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Manual will be updated when this change is commited to CVS source.
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==== Configure Option Notes ====
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You cannot specify PostgreSQL source directly to build PostgreSQL
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module with specific version. You need to install PostgreSQL
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somewhere in your system to build PHP with PostgreSQL support.
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==== Note For PostgreSQL 7.2 beta ====
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Current CVS version (probably 4.0.6 or later) compiles without
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modefication.
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==== TODO List ===
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pg_convert_array() - convert array elements for SQL statement.
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Support async connection create.
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==== Experimental Functions =====
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WARNING: API/behavior may be changed without notice.
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Async query can improve application performance
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*significantly*. Please test and report any failure to
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yohgaki@php.net
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There are some cases that async functions blocks process. Even if
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process was blocked, functions work as expected. (except it blocks
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process) These are cases that process is blocked. Refer to libpq
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manual for details. Followings are common cases that async functions
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are blocked.
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- If libpq is compile with USE_SSL, some async functions are
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blocked.
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- If libpq under Win32 is *NOT* compiled with
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WIN32_NON_BLOCKING_CONNECTIONS, non-blocking connection will block.
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Async function may also block if you have not retrive result and
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send or execute query. If there is result left on connection,
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pg_send_query() will block until last query is completed.
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Garbages are cleaned when resource is cleaned up. There is no need to
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clean up query result if it is not needed.
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Please refer to libpq manual or source for details.
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These functions are *NOT* supposed to be documented, yet.
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API may be changed.
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-------------------------------------------------------------------
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bool pg_send_query(resource connection, string query)
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Sends async query to backend. Result may be retrieved with
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pg_get_result(). It does not accept multiple query, but it accepts
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multiple queries at once. Each result may be retrieved separately by
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pg_get_result().
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--------------------------------------------------------------------
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bool pg_request_cancel(resource connection)
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Cancels currently executing async query already sent to PostgreSQL
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server. This function is useful when user request time consuming query
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to server. It cannot cancel query executed by pg_exec(), since
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pg_exec() is a blocking function.
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--------------------------------------------------------------------
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resource pg_get_result(resource conn)
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Gets pgsql query result resource. Returned value can be fed to
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pg_result()/pg_fetch_*(). pg_get_result() may block if result is not
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ready to be retrived. Use pg_is_busy() to check result is ready to be
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retrieved or not. If multiple query is sent to backend, it may be
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retrieved one by one using pg_get_result(). If there is no result left
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in connection, it returns false.
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--------------------------------------------------------------------
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bool pg_is_busy(resource connection)
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Returns connections is executing query or not.
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--------------------------------------------------------------------
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int pg_status(resource connection)
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Gets connection status. It returns PGSQL_CONNECTION_OK or
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PGSQL_CONNECTION_BAD.
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--------------------------------------------------------------------
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bool pg_reset(resource connection)
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Resets communication port to Postgresql server using the same
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connection parameter. It's useful for error recovery.
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--------------------------------------------------------------------
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Copy functions
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--------------------------------------------------------------------
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mixed pg_copy_to(int connection_id, string table_name,
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[, string delim [, string null_as]])
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nt pg_copy_from(int connection_id, string table_name, array rows
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[, string delim [, string null_as]])
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--------------------------------------------------------------------
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Utility functions
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--------------------------------------------------------------------
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string pg_escape_string(string data)
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Escape string or binary for SQL statemen (7.2 or later)
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string pg_escape_bytea(string data)
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Escape string or binary for SQL statement (7.2 or later)
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--------------------------------------------------------------------
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Large Object Functions
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--------------------------------------------------------------------
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int pg_lo_tell(resource large_object)
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Returns current position of large object
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--------------------------------------------------------------------
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bool pg_lo_lseek(resource large_object, int offset[, int whence])
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Seeks position of large object
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--------------------------------------------------------------------
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Notice messge function
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--------------------------------------------------------------------
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string pg_last_notice(resource connection)
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Returns the last notice set by the backend
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Currently pg_last_notice() does not return notice message associated
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with the connection.
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--------------------------------------------------------------------
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Again, experimental functions are subject to be changed without
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notice.
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