{"id":2900,"date":"2021-07-21T08:00:08","date_gmt":"2021-07-21T08:00:08","guid":{"rendered":"https:\/\/www.bearloga.space\/?page_id=2900"},"modified":"2021-07-21T08:00:09","modified_gmt":"2021-07-21T08:00:09","slug":"yadro-sqlalchemy-ispolzovanie-soedinenij","status":"publish","type":"page","link":"https:\/\/www.bearloga.space\/uk\/yadro-sqlalchemy-ispolzovanie-soedinenij\/","title":{"rendered":"\u042f\u0434\u0440\u043e SQLAlchemy \u2014 \u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u0412 \u044d\u0442\u043e\u0439 \u0433\u043b\u0430\u0432\u0435 \u043c\u044b \u0443\u0437\u043d\u0430\u0435\u043c, \u043a\u0430\u043a \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0432 SQLAlchemy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u042d\u0444\u0444\u0435\u043a\u0442 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0438\u0433\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u044b\u043c \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u0435\u043c \u0434\u0432\u0443\u0445 \u0442\u0430\u0431\u043b\u0438\u0446 \u043b\u0438\u0431\u043e \u0432&nbsp;<strong>\u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0438 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432,<\/strong>&nbsp;\u043b\u0438\u0431\u043e \u0432&nbsp;<strong>\u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0438 where<\/strong>&nbsp;\u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 select ().&nbsp;\u0422\u0435\u043f\u0435\u0440\u044c \u043c\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u043c\u0435\u0442\u043e\u0434\u044b join () \u0438 outerjoin ().<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041c\u0435\u0442\u043e\u0434 join () \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u043e\u0431\u044a\u0435\u043a\u0442 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438\u0437 \u043e\u0434\u043d\u043e\u0433\u043e \u043e\u0431\u044a\u0435\u043a\u0442\u0430 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0432 \u0434\u0440\u0443\u0433\u043e\u0439.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">join(right, onclause = None, isouter = False, full = False)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0424\u0443\u043d\u043a\u0446\u0438\u0438 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432, \u0443\u043f\u043e\u043c\u044f\u043d\u0443\u0442\u044b\u0445 \u0432 \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u043d\u043d\u043e\u043c \u0432\u044b\u0448\u0435 \u043a\u043e\u0434\u0435, \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>right<\/strong>&nbsp;\u2014 \u043f\u0440\u0430\u0432\u0430\u044f \u0441\u0442\u043e\u0440\u043e\u043d\u0430 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f;&nbsp;\u044d\u0442\u043e \u043b\u044e\u0431\u043e\u0439 \u043e\u0431\u044a\u0435\u043a\u0442 \u0442\u0430\u0431\u043b\u0438\u0446\u044b<\/li><li><strong>onclause<\/strong>&nbsp;\u2014 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0435 SQL, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435 ON \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f.&nbsp;\u0415\u0441\u043b\u0438 \u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c None, \u043e\u043d \u043f\u043e\u043f\u044b\u0442\u0430\u0435\u0442\u0441\u044f \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0438\u0442\u044c \u0434\u0432\u0435 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u044f \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u043a\u043b\u044e\u0447\u0430.<\/li><li><strong>isouter<\/strong>&nbsp;\u2014 \u0435\u0441\u043b\u0438 True, \u0442\u043e&nbsp;<strong>\u0440\u0435\u043d\u0434\u0435\u0440\u0438\u0442\u0441\u044f \u041b\u0415\u0412\u041e\u0415 \u0412\u041d\u0415\u0428\u041d\u0415\u0415<\/strong>&nbsp;\u0421\u041e\u0415\u0414\u0418\u041d\u0415\u041d\u0418\u0415, \u0430 \u043d\u0435 \u0421\u041e\u0415\u0414\u0418\u041d\u0415\u041d\u0418\u0415<\/li><li><strong>full<\/strong>&nbsp;\u2014 \u0435\u0441\u043b\u0438 True, \u0440\u0435\u043d\u0434\u0435\u0440\u0438\u0442 FULL OUTER JOIN \u0432\u043c\u0435\u0441\u0442\u043e LEFT OUTER JOIN<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>right<\/strong>&nbsp;\u2014 \u043f\u0440\u0430\u0432\u0430\u044f \u0441\u0442\u043e\u0440\u043e\u043d\u0430 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f;&nbsp;\u044d\u0442\u043e \u043b\u044e\u0431\u043e\u0439 \u043e\u0431\u044a\u0435\u043a\u0442 \u0442\u0430\u0431\u043b\u0438\u0446\u044b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>onclause<\/strong>&nbsp;\u2014 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0435 SQL, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435 ON \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f.&nbsp;\u0415\u0441\u043b\u0438 \u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c None, \u043e\u043d \u043f\u043e\u043f\u044b\u0442\u0430\u0435\u0442\u0441\u044f \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0438\u0442\u044c \u0434\u0432\u0435 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u044f \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u043a\u043b\u044e\u0447\u0430.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>isouter<\/strong>\u00a0\u2014 \u0435\u0441\u043b\u0438 True, \u0442\u043e\u00a0<strong>\u0440\u0435\u043d\u0434\u0435\u0440\u0438\u0442\u0441\u044f \u041b\u0415\u0412\u041e\u0415 \u0412\u041d\u0415\u0428\u041d\u0415\u0415<\/strong>\u00a0\u0421\u041e\u0415\u0414\u0418\u041d\u0415\u041d\u0418\u0415, \u0430 \u043d\u0435 \u0421\u041e\u0415\u0414\u0418\u041d\u0415\u041d\u0418\u0415<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>full<\/strong>&nbsp;\u2014 \u0435\u0441\u043b\u0438 True, \u0440\u0435\u043d\u0434\u0435\u0440\u0438\u0442 FULL OUTER JOIN \u0432\u043c\u0435\u0441\u0442\u043e LEFT OUTER JOIN<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u043e\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u0430 join () \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u0442 \u043a \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044e \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u043a\u043b\u044e\u0447\u0430.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&gt;&gt;&gt; print(students.join(addresses))<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u042d\u0442\u043e \u044d\u043a\u0432\u0438\u0432\u0430\u043b\u0435\u043d\u0442\u043d\u043e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044e SQL \u2014<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">students JOIN addresses ON students.id = addresses.st_id<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u044f\u0432\u043d\u043e \u0443\u043f\u043e\u043c\u044f\u043d\u0443\u0442\u044c \u043a\u0440\u0438\u0442\u0435\u0440\u0438\u0438 \u043f\u0440\u0438\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">j = students.join(addresses, students.c.id == addresses.c.st_id)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0415\u0441\u043b\u0438 \u043c\u044b \u0441\u0435\u0439\u0447\u0430\u0441 \u043f\u043e\u0441\u0442\u0440\u043e\u0438\u043c \u043d\u0438\u0436\u0435\u043f\u0440\u0438\u0432\u0435\u0434\u0435\u043d\u043d\u0443\u044e \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044e select, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u044d\u0442\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0430\u043a \u2014<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">stmt = select([students]).select_from(j)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u042d\u0442\u043e \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u0442 \u043a \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u043c\u0443 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044e SQL \u2014<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">SELECT students.id, students.name, students.lastname\nFROM students JOIN addresses ON students.id = addresses.st_id<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0415\u0441\u043b\u0438 \u044d\u0442\u043e\u0442 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0431\u0443\u0434\u0443\u0442 \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u0442\u044c\u0441\u044f \u0434\u0430\u043d\u043d\u044b\u0435, \u043e\u0442\u043d\u043e\u0441\u044f\u0449\u0438\u0435\u0441\u044f \u043a \u0432\u044b\u0431\u0440\u0430\u043d\u043d\u044b\u043c \u0441\u0442\u043e\u043b\u0431\u0446\u0430\u043c.&nbsp;\u041f\u043e\u043b\u043d\u044b\u0439 \u043a\u043e\u0434 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u2014<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">from sqlalchemy import create_engine, MetaData, Table, Column, Integer, String, ForeignKey\nengine = create_engine('sqlite:\/\/\/college.db', echo = True)\n\nmeta = MetaData()\nconn = engine.connect()\nstudents = Table(\n   'students', meta, \n   Column('id', Integer, primary_key = True), \n   Column('name', String), \n   Column('lastname', String), \n)\n\naddresses = Table(\n   'addresses', meta, \n   Column('id', Integer, primary_key = True), \n   Column('st_id', Integer,ForeignKey('students.id')), \n   Column('postal_add', String), \n   Column('email_add', String)\n)\n\nfrom sqlalchemy import join\nfrom sqlalchemy.sql import select\nj = students.join(addresses, students.c.id == addresses.c.st_id)\nstmt = select([students]).select_from(j)\nresult = conn.execute(stmt)\nresult.fetchall()<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u0412 \u044d\u0442\u043e\u0439 \u0433\u043b\u0430\u0432\u0435 \u043c\u044b \u0443\u0437\u043d\u0430\u0435\u043c, \u043a\u0430\u043a \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0432 SQLAlchemy. \u042d\u0444\u0444\u0435\u043a\u0442 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0438\u0433\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u044b\u043c \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u0435\u043c \u0434\u0432\u0443\u0445 \u0442\u0430\u0431\u043b\u0438\u0446 \u043b\u0438\u0431\u043e \u0432&nbsp;\u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0438 \u0441\u0442\u043e\u043b\u0431\u0446\u043e\u0432,&nbsp;\u043b\u0438\u0431\u043e [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-2900","page","type-page","status-publish","hentry","category-sqlalchemy"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/pages\/2900","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/comments?post=2900"}],"version-history":[{"count":0,"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/pages\/2900\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/media?parent=2900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/categories?post=2900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bearloga.space\/uk\/wp-json\/wp\/v2\/tags?post=2900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}