Distance between 2 POINTs in Postgis in srid 4326 in metres
This is probably a simple question, but I'm not very good at PostGIS and don't fully grok all of this. Basically I have a table (nodes) with a POINT column (point). I have created an index on this column create index nodes__points on nodes using gist (point) The column was created with select addgeometrycolumn('nodes', 'points', 'POINT', 4326, 2) I am using srid 4326 because I'm adding data that's
PostgreSQLã‚’Pythonã‹ã‚‰psycopg2を使ã£ã¦ã„ã˜ã‚‹ — ãã“ã¯ã‹ã¨ãªã書ãよん。 ドã‚ュメント
ã§ç°¡å˜ã§ã™ã€‚ãŸã ã€C関数を作るã®ã§ã€Python.hãªã©ã®devライブラリやgccã¨ã„㣠ãŸãƒ„ールを事å‰ã«ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã¦ãŠãå¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ ç°¡å˜ãªä½¿ã„方¶ >>> import psycopg2 # コãƒã‚¯ã‚·ãƒ§ãƒ³ä½œæˆ >>> conn = psycopg2.connect("dbname=test host=localhost user=postgres") # ã‚«ãƒ¼ã‚½ãƒ«ä½œæˆ >>> cur = conn.cursor() # SQLコマンド実行 (今回ã¯ãƒ†ãƒ¼ãƒ–ル作æˆ) >>> cur.execute("CREATE TABLE test (id serial PRIMARY KEY, num integer, data varchar);") # SQLコマンド実行 (プレースホルダー使用。エスケープもå‹æ‰‹ã«ã•ã‚Œã‚‹) >>> cur.execute("INSERT INTO test
Postgres reference
Last update: Fri, 16 Nov 2001 04:53:55 +0900 PGconn PostgreSQLã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ãŸã‚ã®ã‚¯ãƒ©ã‚¹ã€‚ãã®ä»–ã®ãƒ¡ã‚½ãƒƒãƒ‰ã¯libpqã¨ã»ã¼åŒã˜ã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ã§æä¾›ã•ã‚Œã¾ã™ã€‚ 例ãˆã°ã€localhost 上㮠PostgreSQL ã«æŽ¥ç¶šã—ã€query を出ã™ãŸã‚ã«ã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ã—ã¦è¡Œã„ã¾ã™ã€‚ require "postgres" conn = PGconn.connect("localhost", 5432, "", "", "test1") res = conn.exec("select * from a;") スーãƒãƒ¼ã‚¯ãƒ©ã‚¹: Object クラスメソッド: connect(pghost, pgport, pgoptions, pgtty, dbname, login, passwd) new(pghost, pgport, pgopt
PostgreSQLã«ã¦ãƒ†ãƒ¼ãƒ–ルやカラムã®å„ç¨®æƒ…å ±ã‚’å–å¾—ã™ã‚‹SQL (テーブル一覧, カラム一覧, プライマリーã‚ãƒ¼æƒ…å ±å–å¾—, テーブルã®ã‚³ãƒ¡ãƒ³ãƒˆã‚’å–å¾—, カラムã®ã‚³ãƒ¡ãƒ³ãƒˆã‚’å–å¾—) - ã„ã‚ã„ã‚備忘録日記
以下メモ書ãã§ã™ã€‚ Postgresã«ã¦ãƒ†ãƒ¼ãƒ–ル一覧ã¨ã‹ã‚«ãƒ©ãƒ 一覧ã¨ã‹å„ç¨®æƒ…å ±ã‚’å–å¾—ã™ã‚‹ãŸã‚ã®SQLã§ã™ã€‚ é–“é•ãˆã¦ã„ãŸã‚‰æ•™ãˆã¦ãã ã•ã„。m(_ _)m [テーブル一覧å–å¾—] select relname as TABLE_NAME from pg_stat_user_tables [カラム一覧] select * from information_schema.columns where table_catalog='データベースå' and table_name='テーブルå' order by ordinal_position; [プライマリーã‚ãƒ¼æƒ…å ±å–å¾—] select ccu.column_name as COLUMN_NAME from information_schema.table_constraints tc ,information_schema.constraint_
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