Class: CartoDB::Client::Connection::PostgreSQL

Inherits:
Object
  • Object
show all
Includes:
Helpers::SqlHelper
Defined in:
lib/cartodb-rb-client/cartodb/client/connection/postgres.rb

Constant Summary collapse

DATA_TYPES_TRANSLATION_TABLE = 
{
  'int4'      => 'number',
  'numeric'   => 'number',
  'text'      => 'string',
  'varchar'   => 'string',
  'date'      => 'date',
  'timestamp' => 'date',
  'bool'      => 'boolean',
  'geometry'  => 'geometry'
}

Instance Method Summary collapse

Methods included from Helpers::SqlHelper

#prepare_data

Constructor Details

#initialize(connection_settings) ⇒ PostgreSQL

Returns a new instance of PostgreSQL.



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 18

def initialize(connection_settings)
  @pg = connect_to_postgres(connection_settings)
end

Instance Method Details

#add_column(table_name, column_name, column_type) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 77

def add_column(table_name, column_name, column_type)
  @pg.query("    ALTER TABLE \#{table_name} ADD COLUMN \#{column_name} \#{column_type};\n  SQL\n  )\nend\n"

#change_column(table_name, old_column_name, new_column_name, column_type) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 91

def change_column(table_name, old_column_name, new_column_name, column_type)
  add_column table_name, new_column_name, column_type
  @pg.query("    UPDATE \#{table_name} SET \#{new_column_name}=cast(\#{old_column_name} as \#{column_type})\n  SQL\n  )\n  drop_column table_name, old_column_name\nend\n"

#create_table(table_name = nil, schema_or_file = nil, the_geom_type = 'Point') ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 35

def create_table(table_name = nil, schema_or_file = nil, the_geom_type = 'Point')
  schema = schema_or_file if schema_or_file && schema_or_file.is_a?(Array)
  file   = schema_or_file if schema_or_file && schema_or_file.is_a?(File)

  params = {:name => table_name}
  params[:file] = file if file

  table_name = table_name.sanitize

  if schema.nil? || schema.empty?
    schema = []
    schema << {:name => 'name',        :type => 'text'} if schema.select{|c| c[:name].eql?('name')}.empty?
    schema << {:name => 'description', :type => 'text'} if schema.select{|c| c[:name].eql?('description')}.empty?
    create_the_geom = "SELECT AddGeometryColumn('public', '#{table_name}', 'the_geom', 4326, 'POINT', 2)"
  end

  schema << {:name => 'cartodb_id',  :type => 'serial',    :extra => 'NOT NULL'}                                                                 if schema.select{|c| c[:name].eql?('cartodb_id')}.empty?
  schema << {:name => 'created_at',  :type => 'timestamp', :extra => 'without time zone DEFAULT current_timestamp::timestamp without time zone'} if schema.select{|c| c[:name].eql?('created_at')}.empty?
  schema << {:name => 'updated_at',  :type => 'timestamp', :extra => 'without time zone DEFAULT current_timestamp::timestamp without time zone'} if schema.select{|c| c[:name].eql?('updated_at')}.empty?
  if schema.any? && schema.select{|c| c[:name].downcase.match(/geo/)}.any?
    the_geom_field = schema.select{|c| c[:name].downcase.match(/geo/)}.first
    create_the_geom = "SELECT AddGeometryColumn('public', '#{table_name}', 'the_geom', 4326, '#{the_geom_field[:geometry_type].upcase}', 2)"
    schema.reject!{|c| c[:name].downcase.match(/geo/)}
  end

  @pg.query("    CREATE TABLE \#{table_name}\n    (\n      \#{schema.map{|s| \"\#{s[:name]} \#{s[:type]} \#{s[:extra]}\"}.join(', ')}\n    )\n    WITH (\n      OIDS=FALSE\n    );\n    ALTER TABLE \#{table_name} OWNER TO \#{@pg.user};\n  SQL\n  )\n\n  @pg.query(create_the_geom) if create_the_geom\n\n  table table_name\nend\n"

#delete_row(table_name, row_id) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 203

def delete_row(table_name, row_id)
  @pg.query("    DELETE FROM \#{table_name}\n    WHERE cartodb_id = \#{row_id}\n  SQL\n  )\nend\n"

#drop_column(table_name, column_name) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 84

def drop_column(table_name, column_name)
  @pg.query("    ALTER TABLE \#{table_name} DROP COLUMN \#{column_name};\n  SQL\n  )\nend\n"

#drop_table(table_name) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 151

def drop_table(table_name)
  @pg.query("    DROP TABLE \#{table_name}\n  SQL\n  )\nend\n"

#insert_row(table_name, row) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 169

def insert_row(table_name, row)
  row = prepare_data(row)

  results = query("    INSERT INTO \#{table_name}\n    (\#{row.keys.join(',')})\n    VALUES (\#{row.values.join(',')});\n\n    SELECT \#{table_name}.cartodb_id as id, \#{table_name}.*\n    FROM \#{table_name}\n    WHERE cartodb_id = currval('public.\#{table_name}_cartodb_id_seq');\n  SQL\n  )\n\n  results.rows.first\nend\n"

#query(sql, options = {}) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 223

def query(sql, options = {})
  sql = sql.strip if sql

  if sql.include?('*')
    table_name = sql.match(/select(.*)\s((\w+\.)?\*)(.*)from\s+(\w*)[^;]*;?/im)[5]
    schema = table(table_name).schema if table_name

    sql.gsub!(/^select(.*)\s((\w+\.)?\*)(.*)from/im) do |matches|
      %Q{SELECT #{$1.strip} #{schema.map{|c| "#{$3}#{c[0]}"}.join(', ')} #{$4.strip} FROM}
    end
  end

  crono = Time.now
  begin
    result = @pg.query("      \#{sql}\n    SQL\n    )\n  rescue PGError => e\n    raise CartoDB::Client::Error.new(nil, nil, nil, e.message)\n  end\n\n  CartoDB::Types::Metadata.from_hash({\n    :time => Time.now - crono,\n    :total_rows => result.cmd_tuples,\n    :rows       => result.map{|row| CartoDB::Types::Metadata.from_hash(row)}\n  })\nend\n"

#records(table_name, options = {}) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 211

def records(table_name, options = {})
  sql = "    SELECT \#{table_name}.cartodb_id AS id, \#{table_name}.*\n    FROM \#{table_name}\n  SQL\n\n  results = query(sql, options)\n\n  results[:name] = table_name\n  results\nend\n"

#row(table_name, row_id) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 158

def row(table_name, row_id)
  results = query("    SELECT \#{table_name}.cartodb_id as id, \#{table_name}.*\n    FROM \#{table_name}\n    WHERE cartodb_id = \#{row_id};\n  SQL\n  )\n\n  results.rows.first\nend\n"

#table(table_name) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 121

def table(table_name)
  pg_result = @pg.query("    SELECT columns.table_name, columns.column_name, columns.udt_name as data_type, geo_cols.type as geometry_type\n    FROM information_schema.tables tables\n    INNER JOIN information_schema.columns columns ON columns.table_name = tables.table_name\n    LEFT OUTER JOIN public.geometry_columns geo_cols ON geo_cols.f_table_schema = columns.table_schema AND geo_cols.f_table_name = columns.table_name AND geo_cols.f_geometry_column = columns.column_name\n    WHERE tables.table_schema = 'public' AND tables.table_name not IN ('spatial_ref_sys', 'geometry_columns', 'geography_columns') AND tables.table_name ilike '\#{table_name}'\n  SQL\n  )\n\n  if pg_result.to_a.empty?\n    non_existing_table = @pg.query(<<-SQL\n      SELECT tables.table_name\n      FROM information_schema.tables tables\n      WHERE tables.table_schema = 'public' AND tables.table_name not IN ('spatial_ref_sys', 'geometry_columns', 'geography_columns') AND tables.table_name ilike '\#{table_name}'\n    SQL\n    )\n    raise CartoDB::Client::Error.new if non_existing_table.to_a.empty?\n  end\n\n  table_result = nil\n  pg_result.each do |column|\n    table_result = CartoDB::Types::Metadata.from_hash({:name => column['table_name'], :schema => []}) unless table_result\n    table_result.schema << %W(\#{column['column_name']} \#{CartoDB::Client::Connection::PostgreSQL::DATA_TYPES_TRANSLATION_TABLE[column['data_type']]})\n    table_result.schema.last << CartoDB::Client::Connection::PostgreSQL::DATA_TYPES_TRANSLATION_TABLE[column['data_type']]  if column['geometry_type']\n    table_result.schema.last << column['geometry_type'].downcase if column['geometry_type']\n  end\n  table_result\nend\n"

#tables ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 100

def tables
  pg_result = @pg.query("    SELECT columns.table_name, columns.column_name, columns.udt_name as data_type\n    FROM information_schema.tables tables\n    INNER JOIN information_schema.columns columns ON columns.table_name = tables.table_name\n    WHERE tables.table_schema = 'public' AND tables.table_name not IN ('spatial_ref_sys', 'geometry_columns', 'geography_columns')\n  SQL\n  )\n\n  result = CartoDB::Types::Metadata.new\n  tables = {}\n  pg_result.each do |column|\n    tables[column['table_name']] = CartoDB::Types::Metadata.from_hash({:name => column['table_name'], :schema => []}) unless tables[column['table_name']]\n    tables[column['table_name']].schema << %W(\#{column['column_name']} \#{CartoDB::Client::Connection::PostgreSQL::DATA_TYPES_TRANSLATION_TABLE[column['data_type']]})\n  end\n\n  result.total_entries = tables.to_a.length\n  result.tables = tables.to_a.map(&:last)\n  result\nend\n"

#update_row(table_name, row_id, row) ⇒ Object 



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# File 'lib/cartodb-rb-client/cartodb/client/connection/postgres.rb', line 186

def update_row(table_name, row_id, row)
  row = prepare_data(row)

  results = query("    UPDATE \#{table_name}\n    SET (\#{row.keys.join(',')})\n    = (\#{row.values.join(',')})\n    WHERE cartodb_id = \#{row_id};\n    SELECT \#{table_name}.cartodb_id as id, \#{table_name}.*\n    FROM \#{table_name}\n    WHERE cartodb_id = currval('public.\#{table_name}_cartodb_id_seq');\n  SQL\n  )\n\n  results.rows.first\nend\n"