8/9/2023 0 Comments Postgres sequel![]() The block should return a string, or nil to signal that it is finished. If a block is provided and :data option is not, this will yield to the block repeatedly. :optionsĪn options SQL string to use, which should contain comma separated options. text is the default, so this should be :csv or :binary. This can be either a string, or any object that responds to each and yields string. The data to copy to PostgreSQL, which should already be in CSV or PostgreSQL text format. If this isn’t given, uses all columns in the table. The columns to insert into, with the same order as the columns in the input data. The following options are respected: :columns If you are using COPY FROM with a filename, you should just use run instead of this method. This method should only be called if you want results returned to the client. This method is only supported if pg 0.14.0+ is the underlying ruby driver. You should probably fix RbConfig::CONFIG in that case.Copy_into uses PostgreSQL’s COPY FROM STDIN SQL statement to do very fast inserts into a table using input preformatting in either CSV or PostgreSQL text format. If RbConfig::CONFIG contains -Wl,-no-undefined, you’ll probably have issues installing sequel_pg. Sequel_pg currently calls functions defined in the pg gem, which does not work on Windows and does not work in some unix-like operating systems that disallow undefined functions in shared libraries. If you are using bundler, you should add it to your Gemfile like so: gem 'sequel_pg', :require => 'sequel' You do not need to require the library, the sequel postgres adapter will require it automatically. In addition to PostgreSQL defaulting to ISO, Sequel also manually sets the date format to ISO by default, so unless you are overriding that setting (via DB.use_iso_date_format = false), you should be OK.Īdding your own type conversion procs only has an effect if those types are not handled by default. Using the SQL, POSTGRESQL, or GERMAN date formats will result in incorrect date/timestamp handling. You must be using the ISO PostgreSQL date format (which is the default). To build the library from a git checkout, after installing the requirements: rake build Known Issues ¶ ↑ There are only a few requirements, which you should probably have before considering use of the library: To get a copy: git clone git:///jeremyevans/sequel_pg.git 1 Answer Sorted by: 3 You should create connection pool only once, and checkout a connection from the pool for each request, but in your code, you just create a new pool for each request. PostgreSQL also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance. The source code is on GitHub: http :/ / github. com / jeremyevans / sequel_pg / issues Contributing ¶ ↑ Sequel_pg uses GitHub Issues for tracking issues/bugs: http :/ / github. ![]() ![]() stream_all_queries = true Reporting issues/bugs ¶ ↑ It sets the SEQUEL_PG_STREAM environment variable when running Sequel’s specs, make sure that spec/spec_config.rb in Sequel is set to connect to PostgreSQL and use the following additional settings: DB. sequel, and uses a small spec suite for parts of sequel_pg not covered by Sequel’s specs. There is a spec_cov task that assumes you have Sequel checked out at. Sequel_pg is designed to replace a part of Sequel, so it shold be tested using Sequel’s specs (the spec_postgres rake task). Alternatively, you can use the POSTGRES_LIB and POSTGRES_INCLUDE environment variables to specify the shared library and header directories. Make sure the pg_config binary is in your PATH so the installation can find the PostgreSQL shared library and header files. stream_all_queries = true Installing the gem ¶ ↑ gem install sequel_pg If you want to enable streaming for all of a database’s datasets, you can do the following: DB. Here’s an example that shows the difference it makes on a couple of models: Track. The speed up that sequel_pg gives you depends on what you are selecting, but it should be noticeable whenever many rows are selected. The C version is significantly faster than the pure ruby version that Sequel uses by default. Sequel_pg overwrites the inner loop of the Sequel postgres adapter row fetching code with a C version. ![]()
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