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shared_examples_for 'a Reader' do
before :all do
setup_test_environment
end
before do
@connection = DataObjects::Connection.new(CONFIG.uri)
@reader = @connection.create_command("SELECT code, name FROM widgets WHERE ad_description = ? order by id").execute_reader('Buy this product now!')
@reader2 = @connection.create_command("SELECT code FROM widgets WHERE ad_description = ? order by id").execute_reader('Buy this product now!')
end
after do
@reader.close
@reader2.close
@connection.close
end
it { expect(@reader).to respond_to(:fields) }
describe 'fields' do
it 'should return the correct fields in the reader' do
# we downcase the field names as some drivers such as do_derby, do_h2,
# do_hsqldb, do_oracle return the field names as uppercase
expect(@reader.fields).to be_array_case_insensitively_equal_to(['code', 'name'])
end
it 'should return the field alias as the name, when the SQL AS keyword is specified' do
reader = @connection.create_command("SELECT code AS codigo, name AS nombre FROM widgets WHERE ad_description = ? order by id").execute_reader('Buy this product now!')
expect(reader.fields).not_to be_array_case_insensitively_equal_to(['code', 'name'])
expect(reader.fields).to be_array_case_insensitively_equal_to(['codigo', 'nombre'])
reader.close
end
end
it { expect(@reader).to respond_to(:values) }
describe 'values' do
describe 'when the reader is uninitialized' do
it 'should raise an error' do
expect { @reader.values }.to raise_error(DataObjects::DataError)
end
end
describe 'when the reader is moved to the first result' do
before do
@reader.next!
end
it 'should return the correct first set of in the reader' do
expect(@reader.values).to eq(["W0000001", "Widget 1"])
end
end
describe 'when the reader is moved to the second result' do
before do
@reader.next!; @reader.next!
end
it 'should return the correct first set of in the reader' do
expect(@reader.values).to eq(["W0000002", "Widget 2"])
end
end
describe 'when the reader is moved to the end' do
before do
while @reader.next! ; end
end
it 'should raise an error again' do
expect { @reader.values }.to raise_error(DataObjects::DataError)
end
end
end
it { expect(@reader).to respond_to(:close) }
describe 'close' do
describe 'on an open reader' do
it 'should return true' do
expect(@reader.close).to be_truthy
end
end
describe 'on an already closed reader' do
before do
@reader.close
end
it 'should return false' do
expect(@reader.close).to be_falsey
end
end
end
it { expect(@reader).to respond_to(:next!) }
describe 'next!' do
describe 'successfully moving the cursor initially' do
it 'should return true' do
expect(@reader.next!).to be_truthy
end
end
describe 'moving the cursor' do
before do
@reader.next!
end
it 'should move the cursor to the next value' do
expect(@reader.values).to eq(["W0000001", "Widget 1"])
expect { @reader.next! }.to change { @reader.values }
expect(@reader.values).to eq(["W0000002", "Widget 2"])
end
end
describe 'arriving at the end of the reader' do
before do
while @reader.next!; end
end
it 'should return false when the end is reached' do
expect(@reader.next!).to be_falsey
end
end
end
it { expect(@reader).to respond_to(:field_count) }
describe 'field_count' do
it 'should count the number of fields' do
expect(@reader.field_count).to eq(2)
end
end
it { expect(@reader).to respond_to(:values) }
describe 'each' do
it 'should yield each row to the block for multiple columns' do
rows_yielded = 0
@reader.each do |row|
expect(row).to respond_to(:[])
expect(row.size).to eq(2)
# the field names need to be case insensitive as some drivers such as
# do_derby, do_h2, do_hsqldb return the field names as uppercase
expect(row['name'] || row['NAME']).to be_kind_of(String)
expect(row['code'] || row['CODE']).to be_kind_of(String)
rows_yielded += 1
end
expect(rows_yielded).to eq(15)
end
it 'should yield each row to the block for a single column' do
rows_yielded = 0
@reader2.each do |row|
expect(row).to respond_to(:[])
expect(row.size).to eq(1)
# the field names need to be case insensitive as some drivers such as
# do_derby, do_h2, do_hsqldb return the field names as uppercase
expect(row['code'] || row['CODE']).to be_kind_of(String)
rows_yielded += 1
end
expect(rows_yielded).to eq(15)
end
it 'should return the reader' do
expect(@reader.each { |row| }).to equal(@reader)
end
end
end
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