def check_model_creation(model, model_version, service):
model_json = get_model_json(model, model_version, service)
metadata = MetaData()
metadata = make_model_from_service(model, model_version, service, metadata)
eq_(len(metadata.tables), len(model_json['tables']))
def write(model, model_version, output, service):
"""Generate entity relationship diagram for the data model specified.
Arguments:
model Model to generate DDL for.
model_version Model version to generate DDL for.
output Output file for ERD.
service Base URL of the data models service to use.
Raises:
ImportError, if erlalchemy cannot be imported
""" # noqa
metadata = MetaData()
model_json = get_model_json(model, model_version, service)
make_model(model_json, metadata)
from eralchemy import render_er
render_er(metadata, output)
def make_model_from_service(model, model_version, service, metadata):
from dmsa.utility import get_model_json
return make_model(get_model_json(model, model_version, service), metadata)
def generate(model, model_version, dialect, tables=True, constraints=True,
indexes=True, drop=False, delete_data=False, nologging=False,
logging=False,
service='https://data-models-service.research.chop.edu/'):
"""Generate data definition language for the data model specified in the
given DBMS dialect.
Arguments:
model Model to generate DDL for.
model_version Model version to generate DDL for.
dialect DBMS dialect to generate DDL in.
tables Include tables when generating DDL.
constraints Include constraints when generating DDL.
indexes Include indexes when generating DDL.
drop Generate DDL to drop, instead of create, objects.
delete_data Generate DML to delete data from the model.
nologging Generate Oracle DDL to make objects "nologging".
logging Generate Oracle DDL to make objects "logging".
service Base URL of the data models service to use.
""" # noqa
metadata = MetaData()
model_json = get_model_json(model, model_version, service)
make_model(model_json, metadata)
service_version = get_service_version(service)
engine = create_engine(dialect + '://')
output = []
INSERT = ("INSERT INTO version_history (operation, model, model_version, "
"dms_version, dmsa_version) VALUES ('{operation}', '" +
model + "', '" + model_version + "', '" +
service_version + "', '" + __version__ + "');\n\n")
if dialect.startswith('oracle'):
INSERT = INSERT + "COMMIT;\n\n"
version_history = Table(
'version_history', MetaData(),
Column('datetime', DateTime(), primary_key=True,
server_default=text('CURRENT_TIMESTAMP')),
Column('operation', String(100)),
Column('model', String(16)),
Column('model_version', String(50)),
Column('dms_version', String(50)),
Column('dmsa_version', String(50))
)
version_tbl_ddl = str(CreateTable(version_history).
compile(dialect=engine.dialect)).strip()
if dialect.startswith('mssql'):
version_tbl_ddl = ("IF OBJECT_ID ('version_history', 'U') IS NULL " +
version_tbl_ddl + ";")
elif dialect.startswith('oracle'):
version_tbl_ddl = ("BEGIN\n" +
"EXECUTE IMMEDIATE '" + version_tbl_ddl + "';\n" +
"EXCEPTION\n" +
"WHEN OTHERS THEN\n" +
"IF SQLCODE = -955 THEN NULL;\n" +
"ELSE RAISE;\n" +
"END IF;\nEND;\n/")
else:
version_tbl_ddl = version_tbl_ddl.replace('CREATE TABLE',
'CREATE TABLE IF NOT EXISTS')
version_tbl_ddl = version_tbl_ddl + ";"
if delete_data:
output.append(INSERT.format(operation='delete data'))
tables = reversed(metadata.sorted_tables)
output.extend(delete_ddl(tables, engine))
output.insert(0, version_tbl_ddl + '\n\n')
output = ''.join(output)
return output
LOGGING = 'ALTER {type} {name} LOGGING;\n'
NOLOGGING = 'ALTER {type} {name} NOLOGGING;\n'
if tables:
if drop:
tables = reversed(metadata.sorted_tables)
output.extend(table_ddl(tables, engine, True))
output.insert(0, INSERT.format(operation='drop tables'))
elif logging and dialect.startswith('oracle'):
output.append(INSERT.format(operation='table logging'))
for table in metadata.sorted_tables:
output.append(LOGGING.format(type='TABLE', name=table.name))
output.append('\n')
elif nologging and dialect.startswith('oracle'):
output.append(INSERT.format(operation='table nologging'))
for table in metadata.sorted_tables:
output.append(NOLOGGING.format(type='TABLE', name=table.name))
output.append('\n')
else:
output.append(INSERT.format(operation='create tables'))
tables = metadata.sorted_tables
output.extend(table_ddl(tables, engine, False))
if constraints:
if drop and not dialect.startswith('sqlite'):
tables = reversed(metadata.sorted_tables)
output.insert(0, '\n')
output[0:0] = constraint_ddl(tables, engine, True)
output.insert(0, INSERT.format(operation='drop constraints'))
elif logging:
pass
elif nologging:
pass
elif not dialect.startswith('sqlite'):
output.append('\n')
output.append(INSERT.format(operation='create constraints'))
tables = metadata.sorted_tables
output.extend(constraint_ddl(tables, engine, False))
if indexes:
if drop:
tables = reversed(metadata.sorted_tables)
output.insert(0, '\n')
output[0:0] = index_ddl(tables, engine, True)
output.insert(0, INSERT.format(operation='drop indexes'))
elif logging and dialect.startswith('oracle'):
output.append(INSERT.format(operation='index logging'))
for table in metadata.sorted_tables:
output.append(LOGGING.format(type='INDEX', name=table.name))
output.append('\n')
elif nologging and dialect.startswith('oracle'):
output.append(INSERT.format(operation='index nologging'))
for table in metadata.sorted_tables:
output.append(NOLOGGING.format(type='INDEX', name=table.name))
output.append('\n')
else:
output.append('\n')
output.append(INSERT.format(operation='create indexes'))
tables = metadata.sorted_tables
output.extend(index_ddl(tables, engine, False))
output.insert(0, version_tbl_ddl + '\n\n')
output = ''.join(output)
return output
