PG will not build SQL for you. Each element of the in list must be its own parameter. sql = select * from table where type in ($1, $2, $3) pg _con = PG ::Connection.open(myserver) p pg _con.exec_params(sql, [a, b, c]).values But since you’re using Ruby on Rails there’s no need to write simple SQL. Use ActiveRecord. Let’s say the table name is things.
Be sure to free the returned result handle with pg_result -clear when you are done with it. See Section 5.13, “Example – COPY FROM and COPY TO” for an example . If optional arguments are supplied, this command becomes a simplified form of pg_exec_params , supporting only text-format arguments with a text-format result.
The statement must be prepared with an SQL PREPARE command, for example: PREPARE statementName (INTEGER) AS SELECT * FROM mytable WHERE ID > $1 This can be sent to the database with pg_exec or pg_execute (but note that $1 must be escaped for Tcl as $1). Prepared statements persist until the end of a session.
7/6/2020 · The example uses exec_params to create and execute a prepared statement. stm = SELECT $1::int AS a, $2::int AS b, $3::int AS c In the statement, we append data types of the expected parameters to the placeholders. rs = con.exec_params(stm, [1, 2, 3]) The exec_params method sends an SQL query request to the database using placeholders for parameters.
require ‘pg’ conn = PG::Connection. open ( :dbname => ‘test’ ) res = conn. exec_params ( ‘SELECT $1 AS a, $2 AS b, $3 AS c’, [ 1, 2, nil ]) # Equivalent to: # res = conn.exec (‘SELECT 1 AS a, 2 AS b, NULL AS c’) See the PG::Result class for information on working with the results of a query.
For example , to send query to the database on the localhost: require ‘pg’ conn = PG ::Connection.open(:dbname => ‘test’) res = conn.exec_params(‘SELECT $1 AS a, $2 AS b, $3 AS c’, [1, 2, nil]) See the PG::Result class for information on working with the results of a query.
require ‘ pg ‘ require ‘sinatra’ DB = PG ::Connection.new(dbconfig) def qry(sql, params=[]) @res = DB.exec_params(‘select js from ‘ + sql, params) end after do content_type ‘application/json’ body @res[0][‘js’] end get ‘/people’ do qry(‘get_people()’) end get %r{/people/([0-9]+)} do |id| qry(‘get_person($1)’, [id]) end put %r{/people/([0-9]+)} do |id| qry(‘update_password($1, $2)’, [id,.
A small example usage: #!/usr/bin/env ruby require ‘ pg ‘ # Output a table of current connections to the DB conn = PG . connect ( dbname: ‘ sales ‘) conn. exec ( SELECT * FROM pg _stat_activity ) do | result | puts PID | User | Query result. each do | row | puts %7d | %-16s | %s % row. values_at (‘ pid ‘, ‘ usename ‘, ‘ query ‘) end end Build Status. Requirements, C++ (Cpp) work::exec – 4 examples found. These are the top rated real world C++ (Cpp) examples of pqxx::work::exec extracted from open source projects. You can rate examples to help us improve the quality of examples . Programming Language: C++ (Cpp).
It works with PostgreSQL 9.2 and later. A small example usage: require ‘ pg ‘ conn = PG . connect ( dbname: ‘sales’ ) conn.exec( SELECT * FROM pg _stat_activity ) do |result| puts PID | User | Query result.each do |row| puts %7d | %-16s | %s % row.values_at(‘procpid’, …
