class Blazer::Adapters::Neo4jAdapter

Public Instance Methods

parameter_binding() click to toggle source
# File lib/blazer/adapters/neo4j_adapter.rb, line 42
def parameter_binding
  proc do |statement, variables|
    variables.each_key do |k|
      statement = statement.gsub("{#{k}}") { "$#{k} " }
    end
    [statement, variables]
  end
end
preview_statement() click to toggle source
# File lib/blazer/adapters/neo4j_adapter.rb, line 33
def preview_statement
  "MATCH (n:{table}) RETURN n LIMIT 10"
end
quoting() click to toggle source

neo4j.com/docs/cypher-manual/current/syntax/expressions/#cypher-expressions-string-literals

# File lib/blazer/adapters/neo4j_adapter.rb, line 38
def quoting
  :backslash_escape
end
run_statement(statement, comment, bind_params) click to toggle source
# File lib/blazer/adapters/neo4j_adapter.rb, line 4
def run_statement(statement, comment, bind_params)
  columns = []
  rows = []
  error = nil

  begin
    result = session.query("#{statement} /*#{comment}*/", bind_params)
    columns = result.columns.map(&:to_s)
    rows = []
    result.each do |row|
      rows << columns.map do |c|
        v = row.send(c)
        v = v.properties if v.respond_to?(:properties)
        v
      end
    end
  rescue => e
    error = e.message
    error = Blazer::VARIABLE_MESSAGE if error.include?("Invalid input '$'")
  end

  [columns, rows, error]
end
tables() click to toggle source
# File lib/blazer/adapters/neo4j_adapter.rb, line 28
def tables
  result = session.query("CALL db.labels()")
  result.rows.map(&:first)
end

Protected Instance Methods

session() click to toggle source
# File lib/blazer/adapters/neo4j_adapter.rb, line 53
def session
  @session ||= begin
    require "neo4j/core/cypher_session/adaptors/http"
    http_adaptor = Neo4j::Core::CypherSession::Adaptors::HTTP.new(settings["url"])
    Neo4j::Core::CypherSession.new(http_adaptor)
  end
end