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sqlite数据库的使用

江南北 2022-03-16 阅读 165

sqlite数据库的使用

进入数据库

 sqlite3 module_build_service.db 

查询所有表

sqlite> .table

创建数据库文件:

>SQLite3 d:\test.db 回车      #就生成了一个test.db在d盘。这样同时也SQLite3挂上了这个test.db  

看表结构

>.schema 表名  

看看目前挂的数据库

>.database 

把查询输出到文件

>.output 文件名  

把查询结果用屏幕输出

>.output stdout  

退出

>.exit 或者.quit

postgresql

数据库的基本使用

咱们的是在85上,数据库为koji,用户名也是koji

登录( 注意: postgres 是默认用户即管理员 ):
路径 psql -h 服务器 -U 用户名  -d 数据库 -p 端口地址  // -U 是大写
[root@kojihub ~]# psql -h localhost -U postgres
查询数据库
postgres=# \l
                             List of databases
   Name    |  Owner   | Encoding  | Collate | Ctype |   Access privileges   
-----------+----------+-----------+---------+-------+-----------------------
 koji      | koji     | SQL_ASCII | C       | C     | 
 postgres  | postgres | SQL_ASCII | C       | C     | 
 template0 | postgres | SQL_ASCII | C       | C     | =c/postgres          +
           |          |           |         |       | postgres=CTc/postgres
 template1 | postgres | SQL_ASCII | C       | C     | =c/postgres          +
           |          |           |         |       | postgres=CTc/postgres
选择数据库postgres=# \c koji
You are now connected to database "koji" as user "postgres".
查询表(在执行选择数据库之后)
koji-# \dt  

修改数据
update [表名] set [目标字段名]=[目标值] where [该行特征];
例子
koji=# update module_builds set scmurl='git+http://10.4.10.83/modules/mariadb.git?#6287b79e5c4df788c7770e81cc0cc0e0774e8060' where id=5;

1、数据库的连接信息可以这样写:

String driver = "org.postgresql.Driver";
String url = "jdbc:postgresql://<ip地址>:<端口>/<数据库名>";
String username = <用户名>;
String password = <密码>;

flask的链接

postgresql://username:password@localhost/mydatabase
本地: #postgres 这个是默认账户
postgresql://koji:mbox@postgresql/mboxdb

本地的postgresql步骤

下载

yum install postgresql-server -y
# 不要单独下载postgresql,版本会乱,卸载干净 :
#rpm -qa|grep postgresql
#rpm -ev postgresql-12.6-1.fc33.x86_64

检查一下版本信息

psql --version

安装完成之后,不能直接启动数据库,需要先执行初始化,初始化之后,会生成postgresql相关配置文件和数据库文件,他们都会存放在路径/var/lib/pgsql/data

初始化数据库

postgresql-setup initdb

启动数据库

service postgresql start

修改配置文件

[root@localhost ~]# psql -U postgres
psql: 错误: 致命错误:  对用户"postgres"的对等认证失败

需要解决root用户下无法通过psql -U postgres登录的问题,我们需要修改配置文件

/var/lib/pgsql/data/pg_hba.conf

# TYPE  DATABASE        USER            ADDRESS                 METHOD
host    koji            koji            127.0.0.1/32            trust
# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            trust
# IPv6 local connections:
host    all             all             ::1/128                 trust
host    all             all             all                     trust

上面的本地已经可以,下面的共享还有些问题

/var/lib/pgsql/data/postgresql.conf

另外,我们需要让外部IP能够连接本机的postgresql,我们需要修改postgresql.conf配置文件中的listen_addresses= "*"
log_rotation_size = 10MB  #默认为0会报错

权限问题

 chmod 0700 /var/lib/pgsql/data -R 

重启

service postgresql restart

修改数据库密码

psql -U postgres  #进入数据库
 \password     #修改密码

创建数据库

psql -U postgres  #进入数据库
CREATE DATABASE koji;

删除数据库

psql -U postgres 
DROP DATABASE koji;

脚本创建数据库

echo -e "createuser koji\n dropdb koji\n createdb -O koji koji\n exit\n" | sh clear_db.sh
!/bin/bash
su - postgres
createuser koji   #当询问到y/n,全部选n
dropdb koji #删除koji数据库
createdb -O koji koji  #创建一个名为koji的数据库,并由koji用户来管理,
exit

netstat -nat

对应的文件

postgresql.conf

# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
#   name = value
#
# (The "=" is optional.)  Whitespace may be used.  Comments are introduced with
# "#" anywhere on a line.  The complete list of parameter names and allowed
# values can be found in the PostgreSQL documentation.
#
# The commented-out settings shown in this file represent the default values.
# Re-commenting a setting is NOT sufficient to revert it to the default value;
# you need to reload the server.
#
# This file is read on server startup and when the server receives a SIGHUP
# signal.  If you edit the file on a running system, you have to SIGHUP the
# server for the changes to take effect, run "pg_ctl reload", or execute
# "SELECT pg_reload_conf()".  Some parameters, which are marked below,
# require a server shutdown and restart to take effect.
#
# Any parameter can also be given as a command-line option to the server, e.g.,
# "postgres -c log_connections=on".  Some parameters can be changed at run time
# with the "SET" SQL command.
#
# Memory units:  kB = kilobytes        Time units:  ms  = milliseconds
#                MB = megabytes                     s   = seconds
#                GB = gigabytes                     min = minutes
#                TB = terabytes                     h   = hours
#                                                   d   = days


#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------

# The default values of these variables are driven from the -D command-line
# option or PGDATA environment variable, represented here as ConfigDir.

#data_directory = 'ConfigDir'		# use data in another directory
					# (change requires restart)
#hba_file = 'ConfigDir/pg_hba.conf'	# host-based authentication file
					# (change requires restart)
#ident_file = 'ConfigDir/pg_ident.conf'	# ident configuration file
					# (change requires restart)

# If external_pid_file is not explicitly set, no extra PID file is written.
#external_pid_file = ''			# write an extra PID file
					# (change requires restart)


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

# - Connection Settings -
listen_addresses= '*'
#listen_addresses = 'localhost'		# what IP address(es) to listen on;
					# comma-separated list of addresses;
					# defaults to 'localhost'; use '*' for all
					# (change requires restart)
#port = 5432				# (change requires restart)
max_connections = 100			# (change requires restart)
#superuser_reserved_connections = 3	# (change requires restart)
#unix_socket_directories = '/var/run/postgresql, /tmp'	# comma-separated list of directories
					# (change requires restart)
#unix_socket_group = ''			# (change requires restart)
#unix_socket_permissions = 0777		# begin with 0 to use octal notation
					# (change requires restart)
#bonjour = off				# advertise server via Bonjour
					# (change requires restart)
#bonjour_name = ''			# defaults to the computer name
					# (change requires restart)

# - TCP settings -
# see "man 7 tcp" for details

#tcp_keepalives_idle = 0		# TCP_KEEPIDLE, in seconds;
					# 0 selects the system default
#tcp_keepalives_interval = 0		# TCP_KEEPINTVL, in seconds;
					# 0 selects the system default
#tcp_keepalives_count = 0		# TCP_KEEPCNT;
					# 0 selects the system default
#tcp_user_timeout = 0			# TCP_USER_TIMEOUT, in milliseconds;
					# 0 selects the system default

# - Authentication -

#authentication_timeout = 1min		# 1s-600s
#password_encryption = md5		# md5 or scram-sha-256
#db_user_namespace = off

# GSSAPI using Kerberos
#krb_server_keyfile = 'FILE:${sysconfdir}/krb5.keytab'
#krb_caseins_users = off

# - SSL -

#ssl = off
#ssl_ca_file = ''
#ssl_cert_file = 'server.crt'
#ssl_crl_file = ''
#ssl_key_file = 'server.key'
#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers
#ssl_prefer_server_ciphers = on
#ssl_ecdh_curve = 'prime256v1'
#ssl_min_protocol_version = 'TLSv1'
#ssl_max_protocol_version = ''
#ssl_dh_params_file = ''
#ssl_passphrase_command = ''
#ssl_passphrase_command_supports_reload = off


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

# - Memory -

shared_buffers = 128MB			# min 128kB
					# (change requires restart)
#huge_pages = try			# on, off, or try
					# (change requires restart)
#temp_buffers = 8MB			# min 800kB
#max_prepared_transactions = 0		# zero disables the feature
					# (change requires restart)
# Caution: it is not advisable to set max_prepared_transactions nonzero unless
# you actively intend to use prepared transactions.
#work_mem = 4MB				# min 64kB
#maintenance_work_mem = 64MB		# min 1MB
#autovacuum_work_mem = -1		# min 1MB, or -1 to use maintenance_work_mem
#max_stack_depth = 2MB			# min 100kB
#shared_memory_type = mmap		# the default is the first option
					# supported by the operating system:
					#   mmap
					#   sysv
					#   windows
					# (change requires restart)
dynamic_shared_memory_type = posix	# the default is the first option
					# supported by the operating system:
					#   posix
					#   sysv
					#   windows
					#   mmap
					# (change requires restart)

# - Disk -

#temp_file_limit = -1			# limits per-process temp file space
					# in kB, or -1 for no limit

# - Kernel Resources -

#max_files_per_process = 1000		# min 25
					# (change requires restart)

# - Cost-Based Vacuum Delay -

#vacuum_cost_delay = 0			# 0-100 milliseconds (0 disables)
#vacuum_cost_page_hit = 1		# 0-10000 credits
#vacuum_cost_page_miss = 10		# 0-10000 credits
#vacuum_cost_page_dirty = 20		# 0-10000 credits
#vacuum_cost_limit = 200		# 1-10000 credits

# - Background Writer -

#bgwriter_delay = 200ms			# 10-10000ms between rounds
#bgwriter_lru_maxpages = 100		# max buffers written/round, 0 disables
#bgwriter_lru_multiplier = 2.0		# 0-10.0 multiplier on buffers scanned/round
#bgwriter_flush_after = 512kB		# measured in pages, 0 disables

# - Asynchronous Behavior -

#effective_io_concurrency = 1		# 1-1000; 0 disables prefetching
#max_worker_processes = 8		# (change requires restart)
#max_parallel_maintenance_workers = 2	# taken from max_parallel_workers
#max_parallel_workers_per_gather = 2	# taken from max_parallel_workers
#parallel_leader_participation = on
#max_parallel_workers = 8		# maximum number of max_worker_processes that
					# can be used in parallel operations
#old_snapshot_threshold = -1		# 1min-60d; -1 disables; 0 is immediate
					# (change requires restart)
#backend_flush_after = 0		# measured in pages, 0 disables


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

# - Settings -

#wal_level = replica			# minimal, replica, or logical
					# (change requires restart)
#fsync = on				# flush data to disk for crash safety
					# (turning this off can cause
					# unrecoverable data corruption)
#synchronous_commit = on		# synchronization level;
					# off, local, remote_write, remote_apply, or on
#wal_sync_method = fsync		# the default is the first option
					# supported by the operating system:
					#   open_datasync
					#   fdatasync (default on Linux)
					#   fsync
					#   fsync_writethrough
					#   open_sync
#full_page_writes = on			# recover from partial page writes
#wal_compression = off			# enable compression of full-page writes
#wal_log_hints = off			# also do full page writes of non-critical updates
					# (change requires restart)
#wal_init_zero = on			# zero-fill new WAL files
#wal_recycle = on			# recycle WAL files
#wal_buffers = -1			# min 32kB, -1 sets based on shared_buffers
					# (change requires restart)
#wal_writer_delay = 200ms		# 1-10000 milliseconds
#wal_writer_flush_after = 1MB		# measured in pages, 0 disables

#commit_delay = 0			# range 0-100000, in microseconds
#commit_siblings = 5			# range 1-1000

# - Checkpoints -

#checkpoint_timeout = 5min		# range 30s-1d
max_wal_size = 1GB
min_wal_size = 80MB
#checkpoint_completion_target = 0.5	# checkpoint target duration, 0.0 - 1.0
#checkpoint_flush_after = 256kB		# measured in pages, 0 disables
#checkpoint_warning = 30s		# 0 disables

# - Archiving -

#archive_mode = off		# enables archiving; off, on, or always
				# (change requires restart)
#archive_command = ''		# command to use to archive a logfile segment
				# placeholders: %p = path of file to archive
				#               %f = file name only
				# e.g. 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'
#archive_timeout = 0		# force a logfile segment switch after this
				# number of seconds; 0 disables

# - Archive Recovery -

# These are only used in recovery mode.

#restore_command = ''		# command to use to restore an archived logfile segment
				# placeholders: %p = path of file to restore
				#               %f = file name only
				# e.g. 'cp /mnt/server/archivedir/%f %p'
				# (change requires restart)
#archive_cleanup_command = ''	# command to execute at every restartpoint
#recovery_end_command = ''	# command to execute at completion of recovery

# - Recovery Target -

# Set these only when performing a targeted recovery.

#recovery_target = ''		# 'immediate' to end recovery as soon as a
                                # consistent state is reached
				# (change requires restart)
#recovery_target_name = ''	# the named restore point to which recovery will proceed
				# (change requires restart)
#recovery_target_time = ''	# the time stamp up to which recovery will proceed
				# (change requires restart)
#recovery_target_xid = ''	# the transaction ID up to which recovery will proceed
				# (change requires restart)
#recovery_target_lsn = ''	# the WAL LSN up to which recovery will proceed
				# (change requires restart)
#recovery_target_inclusive = on # Specifies whether to stop:
				# just after the specified recovery target (on)
				# just before the recovery target (off)
				# (change requires restart)
#recovery_target_timeline = 'latest'	# 'current', 'latest', or timeline ID
				# (change requires restart)
#recovery_target_action = 'pause'	# 'pause', 'promote', 'shutdown'
				# (change requires restart)


#------------------------------------------------------------------------------
# REPLICATION
#------------------------------------------------------------------------------

# - Sending Servers -

# Set these on the master and on any standby that will send replication data.

#max_wal_senders = 10		# max number of walsender processes
				# (change requires restart)
#wal_keep_segments = 0		# in logfile segments; 0 disables
#wal_sender_timeout = 60s	# in milliseconds; 0 disables

#max_replication_slots = 10	# max number of replication slots
				# (change requires restart)
#track_commit_timestamp = off	# collect timestamp of transaction commit
				# (change requires restart)

# - Master Server -

# These settings are ignored on a standby server.

#synchronous_standby_names = ''	# standby servers that provide sync rep
				# method to choose sync standbys, number of sync standbys,
				# and comma-separated list of application_name
				# from standby(s); '*' = all
#vacuum_defer_cleanup_age = 0	# number of xacts by which cleanup is delayed

# - Standby Servers -

# These settings are ignored on a master server.

#primary_conninfo = ''			# connection string to sending server
					# (change requires restart)
#primary_slot_name = ''			# replication slot on sending server
					# (change requires restart)
#promote_trigger_file = ''		# file name whose presence ends recovery
#hot_standby = on			# "off" disallows queries during recovery
					# (change requires restart)
#max_standby_archive_delay = 30s	# max delay before canceling queries
					# when reading WAL from archive;
					# -1 allows indefinite delay
#max_standby_streaming_delay = 30s	# max delay before canceling queries
					# when reading streaming WAL;
					# -1 allows indefinite delay
#wal_receiver_status_interval = 10s	# send replies at least this often
					# 0 disables
#hot_standby_feedback = off		# send info from standby to prevent
					# query conflicts
#wal_receiver_timeout = 60s		# time that receiver waits for
					# communication from master
					# in milliseconds; 0 disables
#wal_retrieve_retry_interval = 5s	# time to wait before retrying to
					# retrieve WAL after a failed attempt
#recovery_min_apply_delay = 0		# minimum delay for applying changes during recovery

# - Subscribers -

# These settings are ignored on a publisher.

#max_logical_replication_workers = 4	# taken from max_worker_processes
					# (change requires restart)
#max_sync_workers_per_subscription = 2	# taken from max_logical_replication_workers


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

# - Planner Method Configuration -

#enable_bitmapscan = on
#enable_hashagg = on
#enable_hashjoin = on
#enable_indexscan = on
#enable_indexonlyscan = on
#enable_material = on
#enable_mergejoin = on
#enable_nestloop = on
#enable_parallel_append = on
#enable_seqscan = on
#enable_sort = on
#enable_tidscan = on
#enable_partitionwise_join = off
#enable_partitionwise_aggregate = off
#enable_parallel_hash = on
#enable_partition_pruning = on

# - Planner Cost Constants -

#seq_page_cost = 1.0			# measured on an arbitrary scale
#random_page_cost = 4.0			# same scale as above
#cpu_tuple_cost = 0.01			# same scale as above
#cpu_index_tuple_cost = 0.005		# same scale as above
#cpu_operator_cost = 0.0025		# same scale as above
#parallel_tuple_cost = 0.1		# same scale as above
#parallel_setup_cost = 1000.0	# same scale as above

#jit_above_cost = 100000		# perform JIT compilation if available
					# and query more expensive than this;
					# -1 disables
#jit_inline_above_cost = 500000		# inline small functions if query is
					# more expensive than this; -1 disables
#jit_optimize_above_cost = 500000	# use expensive JIT optimizations if
					# query is more expensive than this;
					# -1 disables

#min_parallel_table_scan_size = 8MB
#min_parallel_index_scan_size = 512kB
#effective_cache_size = 4GB

# - Genetic Query Optimizer -

#geqo = on
#geqo_threshold = 12
#geqo_effort = 5			# range 1-10
#geqo_pool_size = 0			# selects default based on effort
#geqo_generations = 0			# selects default based on effort
#geqo_selection_bias = 2.0		# range 1.5-2.0
#geqo_seed = 0.0			# range 0.0-1.0

# - Other Planner Options -

#default_statistics_target = 100	# range 1-10000
#constraint_exclusion = partition	# on, off, or partition
#cursor_tuple_fraction = 0.1		# range 0.0-1.0
#from_collapse_limit = 8
#join_collapse_limit = 8		# 1 disables collapsing of explicit
					# JOIN clauses
#force_parallel_mode = off
#jit = on				# allow JIT compilation
#plan_cache_mode = auto			# auto, force_generic_plan or
					# force_custom_plan


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

# - Where to Log -

#log_destination = 'stderr'		# Valid values are combinations of
					# stderr, csvlog, syslog, and eventlog,
					# depending on platform.  csvlog
					# requires logging_collector to be on.

# This is used when logging to stderr:
logging_collector = on			# Enable capturing of stderr and csvlog
					# into log files. Required to be on for
					# csvlogs.
					# (change requires restart)

# These are only used if logging_collector is on:
#log_directory = 'log'			# directory where log files are written,
					# can be absolute or relative to PGDATA
log_filename = 'postgresql-%a.log'	# log file name pattern,
					# can include strftime() escapes
#log_file_mode = 0600			# creation mode for log files,
					# begin with 0 to use octal notation
log_truncate_on_rotation = on		# If on, an existing log file with the
					# same name as the new log file will be
					# truncated rather than appended to.
					# But such truncation only occurs on
					# time-driven rotation, not on restarts
					# or size-driven rotation.  Default is
					# off, meaning append to existing files
					# in all cases.
log_rotation_age = 1d			# Automatic rotation of logfiles will
					# happen after that time.  0 disables.
#改,这个地方必须大于0,默认为0所以重启失败
log_rotation_size = 10MB			# Automatic rotation of logfiles will
					# happen after that much log output.
					# 0 disables.

# These are relevant when logging to syslog:
#syslog_facility = 'LOCAL0'
#syslog_ident = 'postgres'
#syslog_sequence_numbers = on
#syslog_split_messages = on

# This is only relevant when logging to eventlog (win32):
# (change requires restart)
#event_source = 'PostgreSQL'

# - When to Log -

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

#log_min_error_statement = error	# values in order of decreasing detail:
					#   debug5
					#   debug4
					#   debug3
					#   debug2
					#   debug1
					#   info
					#   notice
					#   warning
					#   error
					#   log
					#   fatal
					#   panic (effectively off)

#log_min_duration_statement = -1	# -1 is disabled, 0 logs all statements
					# and their durations, > 0 logs only
					# statements running at least this number
					# of milliseconds

#log_transaction_sample_rate = 0.0	# Fraction of transactions whose statements
					# are logged regardless of their duration. 1.0 logs all
					# statements from all transactions, 0.0 never logs.

# - What to Log -

#debug_print_parse = off
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = on
#log_checkpoints = off
#log_connections = off
#log_disconnections = off
#log_duration = off
#log_error_verbosity = default		# terse, default, or verbose messages
#log_hostname = off
#log_line_prefix = '%m [%p] '		# special values:
					#   %a = application name
					#   %u = user name
					#   %d = database name
					#   %r = remote host and port
					#   %h = remote host
					#   %p = process ID
					#   %t = timestamp without milliseconds
					#   %m = timestamp with milliseconds
					#   %n = timestamp with milliseconds (as a Unix epoch)
					#   %i = command tag
					#   %e = SQL state
					#   %c = session ID
					#   %l = session line number
					#   %s = session start timestamp
					#   %v = virtual transaction ID
					#   %x = transaction ID (0 if none)
					#   %q = stop here in non-session
					#        processes
					#   %% = '%'
					# e.g. '<%u%%%d> '
#log_lock_waits = off			# log lock waits >= deadlock_timeout
#log_statement = 'none'			# none, ddl, mod, all
#log_replication_commands = off
#log_temp_files = -1			# log temporary files equal or larger
					# than the specified size in kilobytes;
					# -1 disables, 0 logs all temp files
log_timezone = 'Asia/Shanghai'

#------------------------------------------------------------------------------
# PROCESS TITLE
#------------------------------------------------------------------------------

#cluster_name = ''			# added to process titles if nonempty
					# (change requires restart)
#update_process_title = on


#------------------------------------------------------------------------------
# STATISTICS
#------------------------------------------------------------------------------

# - Query and Index Statistics Collector -

#track_activities = on
#track_counts = on
#track_io_timing = off
#track_functions = none			# none, pl, all
#track_activity_query_size = 1024	# (change requires restart)
#stats_temp_directory = 'pg_stat_tmp'


# - Monitoring -

#log_parser_stats = off
#log_planner_stats = off
#log_executor_stats = off
#log_statement_stats = off


#------------------------------------------------------------------------------
# AUTOVACUUM
#------------------------------------------------------------------------------

#autovacuum = on			# Enable autovacuum subprocess?  'on'
					# requires track_counts to also be on.
#log_autovacuum_min_duration = -1	# -1 disables, 0 logs all actions and
					# their durations, > 0 logs only
					# actions running at least this number
					# of milliseconds.
#autovacuum_max_workers = 3		# max number of autovacuum subprocesses
					# (change requires restart)
#autovacuum_naptime = 1min		# time between autovacuum runs
#autovacuum_vacuum_threshold = 50	# min number of row updates before
					# vacuum
#autovacuum_analyze_threshold = 50	# min number of row updates before
					# analyze
#autovacuum_vacuum_scale_factor = 0.2	# fraction of table size before vacuum
#autovacuum_analyze_scale_factor = 0.1	# fraction of table size before analyze
#autovacuum_freeze_max_age = 200000000	# maximum XID age before forced vacuum
					# (change requires restart)
#autovacuum_multixact_freeze_max_age = 400000000	# maximum multixact age
					# before forced vacuum
					# (change requires restart)
#autovacuum_vacuum_cost_delay = 2ms	# default vacuum cost delay for
					# autovacuum, in milliseconds;
					# -1 means use vacuum_cost_delay
#autovacuum_vacuum_cost_limit = -1	# default vacuum cost limit for
					# autovacuum, -1 means use
					# vacuum_cost_limit


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

# - Statement Behavior -

#client_min_messages = notice		# values in order of decreasing detail:
					#   debug5
					#   debug4
					#   debug3
					#   debug2
					#   debug1
					#   log
					#   notice
					#   warning
					#   error
#search_path = '"$user", public'	# schema names
#row_security = on
#default_tablespace = ''		# a tablespace name, '' uses the default
#temp_tablespaces = ''			# a list of tablespace names, '' uses
					# only default tablespace
#default_table_access_method = 'heap'
#check_function_bodies = on
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = off
#default_transaction_deferrable = off
#session_replication_role = 'origin'
#statement_timeout = 0			# in milliseconds, 0 is disabled
#lock_timeout = 0			# in milliseconds, 0 is disabled
#idle_in_transaction_session_timeout = 0	# in milliseconds, 0 is disabled
#vacuum_freeze_min_age = 50000000
#vacuum_freeze_table_age = 150000000
#vacuum_multixact_freeze_min_age = 5000000
#vacuum_multixact_freeze_table_age = 150000000
#vacuum_cleanup_index_scale_factor = 0.1	# fraction of total number of tuples
						# before index cleanup, 0 always performs
						# index cleanup
#bytea_output = 'hex'			# hex, escape
#xmlbinary = 'base64'
#xmloption = 'content'
#gin_fuzzy_search_limit = 0
#gin_pending_list_limit = 4MB

# - Locale and Formatting -

datestyle = 'iso, ymd'
#intervalstyle = 'postgres'
timezone = 'Asia/Shanghai'
#timezone_abbreviations = 'Default'     # Select the set of available time zone
					# abbreviations.  Currently, there are
					#   Default
					#   Australia (historical usage)
					#   India
					# You can create your own file in
					# share/timezonesets/.
#extra_float_digits = 1			# min -15, max 3; any value >0 actually
					# selects precise output mode
#client_encoding = sql_ascii		# actually, defaults to database
					# encoding

# These settings are initialized by initdb, but they can be changed.
lc_messages = 'zh_CN.UTF-8'			# locale for system error message
					# strings
lc_monetary = 'zh_CN.UTF-8'			# locale for monetary formatting
lc_numeric = 'zh_CN.UTF-8'			# locale for number formatting
lc_time = 'zh_CN.UTF-8'				# locale for time formatting

# default configuration for text search
default_text_search_config = 'pg_catalog.simple'

# - Shared Library Preloading -

#shared_preload_libraries = ''	# (change requires restart)
#local_preload_libraries = ''
#session_preload_libraries = ''
#jit_provider = 'llvmjit'		# JIT library to use

# - Other Defaults -

#dynamic_library_path = '$libdir'


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

#deadlock_timeout = 1s
#max_locks_per_transaction = 64		# min 10
					# (change requires restart)
#max_pred_locks_per_transaction = 64	# min 10
					# (change requires restart)
#max_pred_locks_per_relation = -2	# negative values mean
					# (max_pred_locks_per_transaction
					#  / -max_pred_locks_per_relation) - 1
#max_pred_locks_per_page = 2            # min 0


#------------------------------------------------------------------------------
# VERSION AND PLATFORM COMPATIBILITY
#------------------------------------------------------------------------------

# - Previous PostgreSQL Versions -

#array_nulls = on
#backslash_quote = safe_encoding	# on, off, or safe_encoding
#escape_string_warning = on
#lo_compat_privileges = off
#operator_precedence_warning = off
#quote_all_identifiers = off
#standard_conforming_strings = on
#synchronize_seqscans = on

# - Other Platforms and Clients -

#transform_null_equals = off


#------------------------------------------------------------------------------
# ERROR HANDLING
#------------------------------------------------------------------------------

#exit_on_error = off			# terminate session on any error?
#restart_after_crash = on		# reinitialize after backend crash?
#data_sync_retry = off			# retry or panic on failure to fsync
					# data?
					# (change requires restart)


#------------------------------------------------------------------------------
# CONFIG FILE INCLUDES
#------------------------------------------------------------------------------

# These options allow settings to be loaded from files other than the
# default postgresql.conf.  Note that these are directives, not variable
# assignments, so they can usefully be given more than once.

#include_dir = '...'			# include files ending in '.conf' from
					# a directory, e.g., 'conf.d'
#include_if_exists = '...'		# include file only if it exists
#include = '...'			# include file


#------------------------------------------------------------------------------
# CUSTOMIZED OPTIONS
#------------------------------------------------------------------------------

# Add settings for extensions here

pg_hba.conf

# PostgreSQL Client Authentication Configuration File
# ===================================================
#
# Refer to the "Client Authentication" section in the PostgreSQL
# documentation for a complete description of this file.  A short
# synopsis follows.
#
# This file controls: which hosts are allowed to connect, how clients
# are authenticated, which PostgreSQL user names they can use, which
# databases they can access.  Records take one of these forms:
#
# local      DATABASE  USER  METHOD  [OPTIONS]
# host       DATABASE  USER  ADDRESS  METHOD  [OPTIONS]
# hostssl    DATABASE  USER  ADDRESS  METHOD  [OPTIONS]
# hostnossl  DATABASE  USER  ADDRESS  METHOD  [OPTIONS]
#
# (The uppercase items must be replaced by actual values.)
#
# The first field is the connection type: "local" is a Unix-domain
# socket, "host" is either a plain or SSL-encrypted TCP/IP socket,
# "hostssl" is an SSL-encrypted TCP/IP socket, and "hostnossl" is a
# plain TCP/IP socket.
#
# DATABASE can be "all", "sameuser", "samerole", "replication", a
# database name, or a comma-separated list thereof. The "all"
# keyword does not match "replication". Access to replication
# must be enabled in a separate record (see example below).
#
# USER can be "all", a user name, a group name prefixed with "+", or a
# comma-separated list thereof.  In both the DATABASE and USER fields
# you can also write a file name prefixed with "@" to include names
# from a separate file.
#
# ADDRESS specifies the set of hosts the record matches.  It can be a
# host name, or it is made up of an IP address and a CIDR mask that is
# an integer (between 0 and 32 (IPv4) or 128 (IPv6) inclusive) that
# specifies the number of significant bits in the mask.  A host name
# that starts with a dot (.) matches a suffix of the actual host name.
# Alternatively, you can write an IP address and netmask in separate
# columns to specify the set of hosts.  Instead of a CIDR-address, you
# can write "samehost" to match any of the server's own IP addresses,
# or "samenet" to match any address in any subnet that the server is
# directly connected to.
#
# METHOD can be "trust", "reject", "md5", "password", "scram-sha-256",
# "gss", "sspi", "ident", "peer", "pam", "ldap", "radius" or "cert".
# Note that "password" sends passwords in clear text; "md5" or
# "scram-sha-256" are preferred since they send encrypted passwords.
#
# OPTIONS are a set of options for the authentication in the format
# NAME=VALUE.  The available options depend on the different
# authentication methods -- refer to the "Client Authentication"
# section in the documentation for a list of which options are
# available for which authentication methods.
#
# Database and user names containing spaces, commas, quotes and other
# special characters must be quoted.  Quoting one of the keywords
# "all", "sameuser", "samerole" or "replication" makes the name lose
# its special character, and just match a database or username with
# that name.
#
# This file is read on server startup and when the server receives a
# SIGHUP signal.  If you edit the file on a running system, you have to
# SIGHUP the server for the changes to take effect, run "pg_ctl reload",
# or execute "SELECT pg_reload_conf()".
#
# Put your actual configuration here
# ----------------------------------
#
# If you want to allow non-local connections, you need to add more
# "host" records.  In that case you will also need to make PostgreSQL
# listen on a non-local interface via the listen_addresses
# configuration parameter, or via the -i or -h command line switches.

# CAUTION: Configuring the system for local "trust" authentication
# allows any local user to connect as any PostgreSQL user, including
# the database superuser.  If you do not trust all your local users,
# use another authentication method.


# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            trust
# IPv6 local connections:
host    all             all             ::1/128                 trust
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     trust
host    replication     all             127.0.0.1/32            trust
host    replication     all             ::1/128                 trust

host all all all md5

postgresql自增字段初始值的设定

在实际开发中会有这样的需求,想要自己设置表中自增字段的初始值。

比如:有一个your_table表中有一个自增字段id,我们知道,插入数据后,默认是从1开始自增的。

但是假如现在有一个需求,是要求id从100开始插入,那么该怎么实现呢?其实就是一句sql命令的事儿:

psql -U postgres  #进入数据库
# \l                 #查看有那些表
\c koji            #选择koji这张表
select setval('module_builds_id_seq', 10000, false);       #select setval('your_table_id_seq', 100, false);

执行成功后,进行测试,插入一条数据后,会发现主键id的值会从100开始递增。

使用pycahrm链接postgresql

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  1. 链接数据库选择postgresql

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        127.0.0.1/32            trust

IPv6 local connections:

host all all ::1/128 trust

Allow replication connections from localhost, by a user with the

replication privilege.

local replication all trust
host replication all 127.0.0.1/32 trust
host replication all ::1/128 trust

host all all all md5




## [postgresql自增字段初始值的设定](https://www.cnblogs.com/yuanyiming/p/12239013.html)

在实际开发中会有这样的需求,想要自己设置表中自增字段的初始值。

比如:有一个your_table表中有一个自增字段id,我们知道,插入数据后,默认是从1开始自增的。

但是假如现在有一个需求,是要求id从100开始插入,那么该怎么实现呢?其实就是一句sql命令的事儿:

```shell
psql -U postgres  #进入数据库
# \l                 #查看有那些表
\c koji            #选择koji这张表
select setval('module_builds_id_seq', 10000, false);       #select setval('your_table_id_seq', 100, false);

执行成功后,进行测试,插入一条数据后,会发现主键id的值会从100开始递增。

使用pycahrm链接postgresql

[外链图片转存中…(img-D7Aj3smA-1647419851909)]

  1. 链接数据库选择postgresql

[外链图片转存中…(img-TnSRqrTr-1647419851909)]

  1. 里面就有
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