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| def connect_to_openlookeng(
self,
host: str = None,
catalog:str = None,
schema:str = None,
user: str = None,
password: str = None,
port: int = 8080,
):
try:
from prestodb.dbapi import Connection
from prestodb import exceptions as presto_exceptions
from prestodb.auth import BasicAuthentication
except ImportError:
raise DependencyError(
"You need to install required dependencies to execute this method,"
" run command: \npip install presto-python-client"
)
if not host:
host = os.getenv("HOST")
if not host:
raise ImproperlyConfigured("Please set your openLooKeng host")
if not catalog:
raise ImproperlyConfigured("Please set your catalog")
if not schema:
raise ImproperlyConfigured("Please set your schema")
if not user:
user = os.getenv("USER")
if not user:
raise ImproperlyConfigured("Please set your openLooKeng user")
if not port:
port = os.getenv("PORT")
if not port:
raise ImproperlyConfigured("Please set your openLooKeng port")
conn = None
try:
auth = BasicAuthentication(user, password) if password else None
conn = Connection(host=host,
user=user,
catalog=catalog,
schema=schema,
port=port,
auth=auth
)
except Exception as e:
raise ValidationError(f"Connection failed: {str(e)}")
def run_sql_openlookeng(sql: str) -> pd.DataFrame:
"""执行 SQL 查询并返回 DataFrame"""
if not conn:
raise ValidationError("Connection is not established")
cur = None
try:
cur = conn.cursor()
cur.execute(sql)
results = cur.fetchall()
if not cur.description:
return pd.DataFrame()
columns = [desc[0] for desc in cur.description]
return pd.DataFrame(results, columns=columns)
except presto_exceptions.DatabaseError as e:
raise ValidationError(f"Query failed: {str(e)}")
finally:
if cur:
cur.close()
def get_full_ddl() -> str:
"""获取 catalog.schema 的元数据描述"""
ddl_scripts = []
try:
tables_df = self.run_sql(
f"SELECT table_name FROM information_schema.tables "+
f"WHERE table_schema = '{schema}'"
)
print(tables_df)
except Exception as e:
raise ValidationError(f"Failed to get tables: {str(e)}")
if tables_df.empty:
return ""
for table in tables_df['table_name']:
try:
desc_df = self.run_sql(
f"DESCRIBE {catalog}.{schema}.\"{table}\""
)
print(desc_df)
cols = []
for _, row in desc_df.iterrows():
col_name = row.get('Column', row.get('column'))
col_type = row.get('Type', row.get('type'))
extra = row.get('Extra', row.get('extra', ''))
col_def = f"{col_name} {col_type}"
if extra:
col_def += f" {extra}"
cols.append(col_def)
ddl_scripts.append(
f"CREATE TABLE {table} (\n " + ",\n ".join(cols) + "\n);"
)
except Exception as e:
print(f"Skipping table {table} due to error: {str(e)}")
continue
return "\n\n".join(ddl_scripts)
def get_table_ddl(table_names: Union[str, List[str]]) -> str:
"""获取指定表的DDL语句"""
ddl_scripts = []
if isinstance(table_names, str):
tables = [table_names]
else:
tables = table_names
for table in tables:
try:
desc_df = self.run_sql(
f'DESCRIBE {catalog}.{schema}."{table}"'
)
cols = []
for _, row in desc_df.iterrows():
col_name = row.get('Column', row.get('column', ''))
col_type = row.get('Type', row.get('type', ''))
extra = row.get('Extra', row.get('extra', ''))
col_def = f"{col_name} {col_type}"
if extra:
col_def += f" {extra}"
cols.append(col_def)
create_stmt = f"CREATE TABLE {table} (\n " + ",\n ".join(
cols) + "\n);"
ddl_scripts.append(create_stmt)
except Exception as e:
print(f"Skipping table {table} due to error: {str(e)}")
continue
return "\n\n".join(ddl_scripts)
self.run_sql_is_set = True
self.run_sql = run_sql_openlookeng
self.get_full_ddl = get_full_ddl
self.get_ddl = get_table_ddl
|
