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185 lines
3.2 KiB
Crystal
185 lines
3.2 KiB
Crystal
require "spec"
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require "../src/db"
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class DummyDriver < DB::Driver
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def build_connection(db : DB::Database) : DB::Connection
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DummyConnection.new(db)
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end
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class DummyConnection < DB::Connection
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def initialize(db)
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super(db)
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@@connections ||= [] of DummyConnection
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@@connections.not_nil! << self
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end
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def self.connections
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@@connections.not_nil!
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end
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def self.clear_connections
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@@connections.try &.clear
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end
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def build_statement(query)
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DummyStatement.new(self, query)
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end
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def last_insert_id : Int64
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0
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end
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protected def do_close
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super
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end
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end
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class DummyStatement < DB::Statement
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property params
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def initialize(connection, @query : String)
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@params = Hash(Int32 | String, DB::Any).new
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super(connection)
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end
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protected def perform_query(args : Enumerable)
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set_params args
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DummyResultSet.new self, @query
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end
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protected def perform_exec(args : Enumerable)
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set_params args
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DB::ExecResult.new 0i64, 0_i64
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end
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private def set_params(args)
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@params.clear
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args.each_with_index do |arg, index|
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set_param(index, arg)
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end
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end
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private def set_param(index, value : DB::Any)
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@params[index] = value
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end
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private def set_param(index, value)
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raise "not implemented for #{value.class}"
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end
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protected def do_close
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super
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end
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end
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class DummyResultSet < DB::ResultSet
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@top_values : Array(Array(String))
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@values : Array(String)?
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@@last_result_set : self?
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def initialize(statement, query)
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super(statement)
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@top_values = query.split.map { |r| r.split(',') }.to_a
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@@last_result_set = self
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end
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protected def do_close
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super
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end
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def self.last_result_set
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@@last_result_set.not_nil!
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end
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def move_next
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@values = @top_values.shift?
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!!@values
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end
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def column_count
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2
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end
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def column_name(index)
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"c#{index}"
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end
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def read
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n = @values.not_nil!.shift?
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raise "end of row" if n.is_a?(Nil)
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return nil if n == "NULL"
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if n == "?"
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return (@statement.as(DummyStatement)).params[0]
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end
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return n
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end
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def read(t : String.class)
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read.to_s
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end
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def read(t : String?.class)
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read.try &.to_s
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end
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def read(t : Int32.class)
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read(String).to_i32
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end
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def read(t : Int64.class)
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read(String).to_i64
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end
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def read(t : Float32.class)
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read(String).to_f32
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end
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def read(t : Float64.class)
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read(String).to_f64
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end
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def read(t : Bytes.class)
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case value = read
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when String
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ary = value.bytes
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Slice.new(ary.to_unsafe, ary.size)
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when Bytes
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value
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else
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raise "#{value} is not convertible to Bytes"
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end
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end
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end
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end
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DB.register_driver "dummy", DummyDriver
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class Witness
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getter count
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def initialize(@count = 1)
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end
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def check
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@count -= 1
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end
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end
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def with_witness(count = 1)
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w = Witness.new(count)
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yield w
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w.count.should eq(0), "The expected coverage was unmet"
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end
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def with_dummy
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DummyDriver::DummyConnection.clear_connections
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DB.open "dummy://host" do |db|
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yield db
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end
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end
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