{"id":7676,"date":"2016-05-10T14:24:08","date_gmt":"2016-05-10T12:24:08","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/connecting-your-postgresql-instance-to-a-microsoft-sql-server-instance\/"},"modified":"2016-05-10T14:24:08","modified_gmt":"2016-05-10T12:24:08","slug":"connecting-your-postgresql-instance-to-a-microsoft-sql-server-instance","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/connecting-your-postgresql-instance-to-a-microsoft-sql-server-instance\/","title":{"rendered":"Connecting your PostgreSQL instance to a Microsoft SQL Server instance"},"content":{"rendered":"<p>In the last posts I looked at how you can connect <a href=\"http:\/\/dbi-services.com\/blog\/connecting-your-postgresql-instance-to-an-oracle-database-the-postgresql-9-5-way\/\" target=\"_blank\" rel=\"noopener\">Oracle<\/a> and <a href=\"http:\/\/dbi-services.com\/blog\/connecting-your-postgresql-instance-to-a-mariadbmysql-instance\/\" target=\"_blank\" rel=\"noopener\">MariaDB\/MySQL<\/a> to a PostgreSQL instance. In this post I&#8217;ll do the same with a MS SQL Server instance.<\/p>\n<p><!--more--><\/p>\n<p>What you need before you can start is a library that implements the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Tabular_Data_Strea\" target=\"_blank\" rel=\"noopener\">Tabular Data Stream<\/a> protocol. For Linux based systems there is <a href=\"http:\/\/www.freetds.org\/\" target=\"_blank\" rel=\"noopener\">FreeTDS<\/a>. Installation is quite easy:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgreporting:\/var\/tmp\/ [pg952] wget ftp:\/\/ftp.freetds.org\/pub\/freetds\/stable\/freetds-patched.tar.gz\npostgres@pgreporting:\/var\/tmp\/ [pg952] ls\nfreetds-patched.tar.gz\npostgres@pgreporting:\/var\/tmp\/ [pg952] tar -axf freetds-patched.tar.gz\npostgres@pgreporting:\/var\/tmp\/freetds-0.95.95\/ [pg952] ls\naclocal.m4  CMakeLists.txt  configure     doc              INSTALL       m4           mkinstalldirs  samples      vms\nAUTHORS     compile         configure.ac  freetds.conf     install-sh    Makefile.am  NEWS           src          win32\nautogen.sh  config.guess    COPYING       freetds.spec     interfaces    Makefile.in  Nmakefile      tds.dox\nBUGS        config.rpath    COPYING.LIB   freetds.spec.in  locales.conf  misc         PWD.in         test-driver\nChangeLog   config.sub      depcomp       include          ltmain.sh     missing      README         TODO\npostgres@pgreporting:\/var\/tmp\/freetds-0.95.95\/ [pg952] .\/configure \npostgres@pgreporting:\/var\/tmp\/freetds-0.95.95\/ [pg952] make\npostgres@pgreporting:\/var\/tmp\/freetds-0.95.95\/ [pg952] sudo make install\n<\/pre>\n<p>At this point in time it is advisable to test the connection to the MS SQL Server instance. FreeTDS will install a default configuration which you can adjust to fit your environment:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgreporting:\/var\/tmp\/freetds-0.95.95\/ [pg952] cat \/usr\/local\/etc\/freetds.conf\n#   $Id: freetds.conf,v 1.12 2007-12-25 06:02:36 jklowden Exp $\n#\n# This file is installed by FreeTDS if no file by the same \n# name is found in the installation directory.  \n#\n# For information about the layout of this file and its settings, \n# see the freetds.conf manpage \"man freetds.conf\".  \n\n# Global settings are overridden by those in a database\n# server specific section\n[global]\n        # TDS protocol version\n;\ttds version = 4.2\n\n\t# Whether to write a TDSDUMP file for diagnostic purposes\n\t# (setting this to \/tmp is insecure on a multi-user system)\n;\tdump file = \/tmp\/freetds.log\n;\tdebug flags = 0xffff\n\n\t# Command and connection timeouts\n;\ttimeout = 10\n;\tconnect timeout = 10\n\t\n\t# If you get out-of-memory errors, it may mean that your client\n\t# is trying to allocate a huge buffer for a TEXT field.  \n\t# Try setting 'text size' to a more reasonable limit \n\ttext size = 64512\n\n# A typical Sybase server\n[egServer50]\n\thost = symachine.domain.com\n\tport = 5000\n\ttds version = 5.0\n\n# A typical Microsoft server\n[mssql]\n\thost = 192.168.22.102\n\tport = 1433\n        database = ds2\n\ttds version = 7.3\n<\/pre>\n<p>The last block specifies the parameters for connecting to my MS SQL Server instance. Lets try:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgreporting:\/home\/postgres\/ [pg952] tsql -I \/usr\/local\/etc\/freetds.conf -S mssql -U ds2user -P xxxxx -o v\nlocale is \"LC_CTYPE=en_US.UTF-8;LC_NUMERIC=de_CH.UTF-8;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=de_CH.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=de_CH.UTF-8;LC_NAME=de_CH.UTF-8;LC_ADDRESS=de_CH.UTF-8;LC_TELEPHONE=de_CH.UTF-8;LC_MEASUREMENT=de_CH.UTF-8;LC_IDENTIFICATION=de_CH.UTF-8\"\nlocale charset is \"UTF-8\"\nusing default charset \"UTF-8\"\n1&gt; select count(*) from sys.databases;\n2&gt; go\n\nusing TDS version 7.3\n5\n(1 row affected)\nusing TDS version 7.3\n<\/pre>\n<p>Cool, works. If you wonder where the ds2user comes from then <a href=\"http:\/\/dbi-services.com\/blog\/the-almost-same-sample-schema-for-all-major-relational-databases-4-mssql\/\" target=\"_blank\" rel=\"noopener\">check this post<\/a>.<\/p>\n<p>Once this works we can proceed with installing the foreign data wrapper for <a href=\"https:\/\/github.com\/tds-fdw\/tds_fdw\" target=\"_blank\" rel=\"noopener\">Sybase \/ MS SQL Server<\/a> which is quite easy as well:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgreporting:\/home\/postgres\/ [PGREP] git clone https:\/\/github.com\/tds-fdw\/tds_fdw.git\nCloning into 'tds_fdw'...\nremote: Counting objects: 588, done.\nremote: Compressing objects: 100% (27\/27), done.\nremote: Total 588 (delta 11), reused 0 (delta 0), pack-reused 561\nReceiving objects: 100% (588\/588), 242.61 KiB | 0 bytes\/s, done.\nResolving deltas: 100% (335\/335), done.\npostgres@pgreporting:\/home\/postgres\/ [PGREP] cd tds_fdw\npostgres@pgreporting:\/home\/postgres\/tds_fdw\/ [PGREP] PATH=$PGHOME:$PATH make USE_PGXS=1\ngcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -O2 -fpic -I.\/include\/ -I. -I.\/ -I\/u01\/app\/postgres\/product\/95\/db_2\/include\/server -I\/u01\/app\/postgres\/product\/95\/db_2\/include\/internal -D_GNU_SOURCE -I\/usr\/include\/libxml2   -c -o src\/tds_fdw.o src\/tds_fdw.c\ngcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -O2 -fpic -I.\/include\/ -I. -I.\/ -I\/u01\/app\/postgres\/product\/95\/db_2\/include\/server -I\/u01\/app\/postgres\/product\/95\/db_2\/include\/internal -D_GNU_SOURCE -I\/usr\/include\/libxml2   -c -o src\/options.o src\/options.c\ngcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -O2 -fpic -I.\/include\/ -I. -I.\/ -I\/u01\/app\/postgres\/product\/95\/db_2\/include\/server -I\/u01\/app\/postgres\/product\/95\/db_2\/include\/internal -D_GNU_SOURCE -I\/usr\/include\/libxml2   -c -o src\/deparse.o src\/deparse.c\ngcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -O2 -fpic -shared -o tds_fdw.so src\/tds_fdw.o src\/options.o src\/deparse.o -L\/u01\/app\/postgres\/product\/95\/db_2\/lib -Wl,--as-needed -Wl,-rpath,'\/u01\/app\/postgres\/product\/95\/db_2\/lib',--enable-new-dtags  -lsybdb \ncp sql\/tds_fdw.sql sql\/tds_fdw--2.0.0-alpha.1.sql\ncp README.md README.tds_fdw.md\npostgres@pgreporting:\/home\/postgres\/tds_fdw\/ [PGREP] sudo PATH=$PGHOME\/bin:$PATH make USE_PGXS=1 install\n\/bin\/mkdir -p '\/u01\/app\/postgres\/product\/95\/db_2\/lib'\n\/bin\/mkdir -p '\/u01\/app\/postgres\/product\/95\/db_2\/share\/extension'\n\/bin\/mkdir -p '\/u01\/app\/postgres\/product\/95\/db_2\/share\/extension'\n\/bin\/mkdir -p '\/u01\/app\/postgres\/product\/95\/db_2\/share\/doc\/extension'\n\/bin\/install -c -m 755  tds_fdw.so '\/u01\/app\/postgres\/product\/95\/db_2\/lib\/tds_fdw.so'\n\/bin\/install -c -m 644 .\/\/tds_fdw.control '\/u01\/app\/postgres\/product\/95\/db_2\/share\/extension\/'\n\/bin\/install -c -m 644 .\/\/sql\/tds_fdw--2.0.0-alpha.1.sql  '\/u01\/app\/postgres\/product\/95\/db_2\/share\/extension\/'\n\/bin\/install -c -m 644 .\/\/README.tds_fdw.md '\/u01\/app\/postgres\/product\/95\/db_2\/share\/doc\/extension\/'\n<\/pre>\n<p>Continue with the usual steps to create the extension in your PostgreSQL instance:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres= create extension tds_fdw;\nCREATE EXTENSION\npostgres= dx\n                                                List of installed extensions\n   Name    |    Version    |   Schema   |                                    Description                                    \n-----------+---------------+------------+-----------------------------------------------------------------------------------\n mysql_fdw | 1.0           | public     | Foreign data wrapper for querying a MySQL server\n plpgsql   | 1.0           | pg_catalog | PL\/pgSQL procedural language\n tds_fdw   | 2.0.0-alpha.1 | public     | Foreign data wrapper for querying a TDS database (Sybase or Microsoft SQL Server)\n(3 rows)\n<\/pre>\n<p>If this succeeds we&#8217;ll need to create the foreign server and the user mapping:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres= create server mssql_svr foreign data wrapper tds_fdw options ( servername '192.168.22.102', port '1433',  database 'ds2', tds_version '7.3', msg_handler 'notice' );\nCREATE schema ds2_mssql;\nCREATE USER MAPPING FOR postgres SERVER mssql_svr  OPTIONS (username 'ds2user', password 'xxxxx');\n<\/pre>\n<p>As I am lazy I want to import the foreign the schema for not needing to specify each table on my own:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres=# IMPORT FOREIGN SCHEMA ds2 FROM SERVER mssql_svr into ds2_mssql;\nERROR:  foreign-data wrapper \"tds_fdw\" does not support IMPORT FOREIGN SCHEMA\n<\/pre>\n<p>Hm, not available. This is tracked <a href=\"https:\/\/github.com\/tds-fdw\/tds_fdw\/issues\/75\" target=\"_blank\" rel=\"noopener\">here<\/a> and might be available in future versions. No other choice than to do some hand work:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\ncreate foreign table ds2_mssql.customers (\n CUSTOMERID            int\n,FIRSTNAME             varchar(50)\n,LASTNAME              varchar(50)\n,ADDRESS1              varchar(50)\n,ADDRESS2              varchar(50)\n,CITY                  varchar(50)\n,STATE                 varchar(50)\n,ZIP                   int\n,COUNTRY               varchar(50)\n,REGION                int\n,EMAIL                 varchar(50)\n,PHONE                 varchar(50)\n,CREDITCARDTYPE        int\n,CREDITCARD            varchar(50)\n,CREDITCARDEXPIRATION  varchar(50)\n,USERNAME              varchar(50)\n,PASSWORD              varchar(50)\n,AGE                   int\n,INCOME                int\n,GENDER                varchar(50))\nSERVER mssql_svr\n    OPTIONS (table 'dbo.customers', row_estimate_method 'showplan_all');\n<\/pre>\n<p>Lets see if it works:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# select count(*) from ds2_mssql.customers;\n count  \n--------\n 200000\n(1 row)\n<\/pre>\n<p>Perfect. Have fun getting data from MS SQL Server.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the last posts I looked at how you can connect Oracle and MariaDB\/MySQL to a PostgreSQL instance. In this post I&#8217;ll do the same with a MS SQL Server instance.<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[77],"type_dbi":[],"class_list":["post-7676","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-postgresql"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Connecting your PostgreSQL instance to a Microsoft SQL Server instance - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/connecting-your-postgresql-instance-to-a-microsoft-sql-server-instance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Connecting your PostgreSQL instance to a Microsoft SQL Server instance\" \/>\n<meta property=\"og:description\" content=\"In the last posts I looked at how you can connect Oracle and MariaDB\/MySQL to a PostgreSQL instance. 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