UJP - 技術情報1

Life is fun and easy!

不正IP報告数

Okan Sensor
 
メイン
ログイン
ブログ カテゴリ一覧

PHP4でtcpip_socketしてPostgreSQLに接続してみる

PHP4でtcpip_socketしてPostgreSQLに接続してみる


0.改訂履歴

  • 2005.10.13 新規作成

1.はじめに

 このドキュメントでは,Apache1.3上で稼働しているPHP4から,PostgreSQLへ接続してみる手順を説明する.postgresql.confファイルでの設定や,accepting TCP/IP connections on port 5432?等というエラーが表示されたりしたときの,対処を行う.

2.接続テスト

  • 次のようなプログラムを作成する.
接続テスト用PHPプログラム
<?php

$DBUSER="postgres";
$PASSWD="nagai_password00!";

$connection = "host=localhost dbname=MyTestDB user=$DBUSER 
password=$PASSWD";

if (( $dbh=pg_connect ($connection)) != FALSE) {
        pg_close($dbh);
        print "Connect OK";
}
else {
        print "Connect faile";
}
 
?>
  • これを実行してみる.
Warning: pg_connect(): Unable to connect to PostgreSQL server: could not
 connect to server: Connection refused Is the server running on host 
"localhost" and accepting TCP/IP connections on port 5432? . in /www/
phpinfo.php on line 10
Connect faile
  • このメッセージは,TCP/IPでの接続が許されていないエラーとなる.

3.postgresql.confの設定

  • postgresql.confを探す.
[root@juno database]# pwd
/usr/local/pgsql/database
[root@juno database]# ls -la
total 56
drwx------    7 postgres postgres     4096 Sep 29 16:11 .
drwxr-xr-x   10 postgres postgres     4096 Sep 14 16:37 ..
-rw-------    1 postgres postgres        4 Sep 14 16:37 PG_VERSION
drwx------    5 postgres postgres     4096 Sep 14 19:08 base
drwx------    2 postgres postgres     4096 Oct 13 13:46 global
drwxrwxr-x    2 postgres postgres     4096 Sep 14 16:53 log
drwx------    2 postgres postgres     4096 Sep 14 16:37 pg_clog
-rw-------    1 postgres postgres     3288 Sep 14 16:37 pg_hba.conf
-rw-------    1 postgres postgres     1441 Sep 14 16:37 pg_ident.conf
drwx------    2 postgres postgres     4096 Sep 14 16:37 pg_xlog
-rw-------    1 postgres postgres     7779 Sep 14 18:40 postgresql.conf
-rw-------    1 postgres postgres       32 Sep 29 16:11 postmaster.opts
-rw-------    1 postgres postgres       51 Sep 29 16:11 postmaster.pid
[root@juno database]#  
  • PGDATA環境変数で指定されているcreate databaseした時のディレクトリ以下に保存されている.
[root@juno database]# cat postgresql.conf
# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
#   name = value
#
# (The '=' is optional.) White space may be used. Comments are introduced
# with '#' anywhere on a line. The complete list of option names and
# allowed values can be found in the PostgreSQL documentation. The
# commented-out settings shown in this file represent the default values.
#
# Any option can also be given as a command line switch to the
# postmaster, e.g. 'postmaster -c log_connections=on'. Some options
# can be changed at run-time with the 'SET' SQL command.
#
# This file is read on postmaster startup and when the postmaster
# receives a SIGHUP. If you edit the file on a running system, you have 
# to SIGHUP the postmaster for the changes to take effect, or use 
# "pg_ctl reload".


#---------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#---------------------------------------------------------------------------

# - Connection Settings -

#tcpip_socket = off 
max_connections = 100
        # note: increasing max_connections costs about 500 bytes of shared
        # memory per connection slot, in addition to costs from shared_buffers
        # and max_locks_per_transaction.
#superuser_reserved_connections = 2
#port = 5432
#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777 # octal
#virtual_host = ''              # what interface to listen on; defaults to any
#rendezvous_name = ''           # defaults to the computer name

# - Security & Authentication -

#authentication_timeout = 60    # 1-600, in seconds
#ssl = false
#password_encryption = true
#krb_server_keyfile = ''
#db_user_namespace = false


#---------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#---------------------------------------------------------------------------

# - Memory -

shared_buffers = 1000           # min 16, at least max_connections*2, 8KB each
#sort_mem = 1024                # min 64, size in KB
#vacuum_mem = 8192              # min 1024, size in KB

# - Free Space Map -

#max_fsm_pages = 20000          # min max_fsm_relations*16, 6 bytes each
#max_fsm_relations = 1000       # min 100, ~50 bytes each

# - Kernel Resource Usage -

#max_files_per_process = 1000   # min 25
#preload_libraries = ''


#---------------------------------------------------------------------------
# WRITE AHEAD LOG
#---------------------------------------------------------------------------

# - Settings -

#fsync = true                   # turns forced synchronization on or off
#wal_sync_method = fsync        # the default varies across platforms:
                                # fsync, fdatasync, open_sync, or open_datasync
#wal_buffers = 8                # min 4, 8KB each

# - Checkpoints -

#checkpoint_segments = 3        # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 300       # range 30-3600, in seconds
#checkpoint_warning = 30        # 0 is off, in seconds
#commit_delay = 0               # range 0-100000, in microseconds
#commit_siblings = 5            # range 1-1000


#---------------------------------------------------------------------------
# QUERY TUNING
#---------------------------------------------------------------------------

# - Planner Method Enabling -

#enable_hashagg = true
#enable_hashjoin = true
#enable_indexscan = true
#enable_mergejoin = true
#enable_nestloop = true
#enable_seqscan = true
#enable_sort = true
#enable_tidscan = true

# - Planner Cost Constants -

#effective_cache_size = 1000    # typically 8KB each
#random_page_cost = 4           # units are one sequential page fetch cost
#cpu_tuple_cost = 0.01          # (same)
#cpu_index_tuple_cost = 0.001   # (same)
#cpu_operator_cost = 0.0025     # (same)

# - Genetic Query Optimizer -

#geqo = true
#geqo_threshold = 11
#geqo_effort = 1
#geqo_generations = 0
#geqo_pool_size = 0             # default based on tables in statement,
                                # range 128-1024
#geqo_selection_bias = 2.0      # range 1.5-2.0

# - Other Planner Options -

#default_statistics_target = 10 # range 1-1000
#from_collapse_limit = 8
#join_collapse_limit = 8        # 1 disables collapsing of explicit JOINs


#---------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#---------------------------------------------------------------------------

# - Syslog -

#syslog = 0                     # range 0-2; 0=stdout; 1=both; 2=syslog
#syslog_facility = 'LOCAL0'
#syslog_ident = 'postgres'

# - When to Log -

#client_min_messages = notice   # Values, in order of decreasing detail:
                                #   debug5, debug4, debug3, debug2, debug1,
                                #   log, info, notice, warning, error

#log_min_messages = notice      # Values, in order of decreasing detail:
                                #   debug5, debug4, debug3, debug2, debug1,
                                #   info, notice, warning, error, log, fatal,
                                #   panic

#log_error_verbosity = default   # terse, default, or verbose messages

#log_min_error_statement = panic # Values in order of increasing severity:
                                 #   debug5, debug4, debug3, debug2, debug1,
                                 #   info, notice, warning, error, panic(off)
                                 
#log_min_duration_statement = -1 # Log all statements whose
                                 # execution time exceeds the value, in
                                 # milliseconds.  Zero prints all queries.
                                 # Minus-one disables.

#silent_mode = false             # DO NOT USE without Syslog!

# - What to Log -

#debug_print_parse = false
#debug_print_rewritten = false
#debug_print_plan = false
#debug_pretty_print = false
#log_connections = false
#log_duration = false
#log_pid = false
#log_statement = false
#log_timestamp = false
#log_hostname = false
#log_source_port = false


#---------------------------------------------------------------------------
# RUNTIME STATISTICS
#---------------------------------------------------------------------------

# - Statistics Monitoring -

#log_parser_stats = false
#log_planner_stats = false
#log_executor_stats = false
#log_statement_stats = false

# - Query/Index Statistics Collector -

#stats_start_collector = true
#stats_command_string = false
#stats_block_level = false
#stats_row_level = false
#stats_reset_on_server_start = true


#---------------------------------------------------------------------------
# CLIENT CONNECTION DEFAULTS
#---------------------------------------------------------------------------

# - Statement Behavior -

#search_path = '$user,public'   # schema names
#check_function_bodies = true
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = false
#statement_timeout = 0          # 0 is disabled, in milliseconds

# - Locale and Formatting -

#datestyle = 'iso, mdy'
#timezone = unknown             # actually, defaults to TZ environment setting
#australian_timezones = false
#extra_float_digits = 0         # min -15, max 2
#client_encoding = sql_ascii    # actually, defaults to database encoding

# These settings are initialized by initdb -- they may be changed
lc_messages = 'C'               # locale for system error message strings
lc_monetary = 'C'               # locale for monetary formatting
lc_numeric = 'C'                # locale for number formatting
lc_time = 'C'                   # locale for time formatting

# - Other Defaults -

#explain_pretty_print = true
#dynamic_library_path = '$libdir'
#max_expr_depth = 10000         # min 10


#---------------------------------------------------------------------------
# LOCK MANAGEMENT
#---------------------------------------------------------------------------

#deadlock_timeout = 1000        # in milliseconds
#max_locks_per_transaction = 64 # min 10, ~260*max_connections bytes each


#---------------------------------------------------------------------------
# VERSION/PLATFORM COMPATIBILITY
#---------------------------------------------------------------------------

# - Previous Postgres Versions -

#add_missing_from = true
#regex_flavor = advanced        # advanced, extended, or basic
#sql_inheritance = true

# - Other Platforms & Clients -

#transform_null_equals = false
[root@juno database]#  
  • パラメータtcpip_socketをoffからonに変更する.
#---------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#---------------------------------------------------------------------------

# - Connection Settings -

tcpip_socket = on
max_connections = 100
        # note: increasing max_connections costs about 500 bytes of shared
        # memory per connection slot, in addition to costs from shared_buffers
        # and max_locks_per_transaction.
  • 設定ファイル変更後,PostgreSQLを再起動する.
[postgres@juno database]$ pg_stop
waiting for postmaster to shut down......done
postmaster successfully shut down
[postgres@juno database]$ pg_start
postmaster successfully started
[postgres@juno database]$ pg_ctl status
pg_ctl: postmaster is running (PID: 8099)
Command line was:
/usr/local/pgsql/bin/postmaster
[postgres@juno database]$  
  • 再度PHPプログラムを起動して接続を行ってみる.
Connect OK
  • これで終了.


広告スペース
Google