DDL Parse

DDL parase and Convert to BigQuery JSON schema and DDL statements module, available in Python.

Features

DDL parse and get table schema information.
Currently, only the CREATE TABLE statement is supported.
Convert to BigQuery JSON schema and BigQuery DDL statements.
Supported databases are MySQL/MariaDB, PostgreSQL, Oracle, Redshift.

Requirement

Python >= 3.5
pyparsing

Installation

Install

pip install:

$ pip install ddlparse

command install:

$ python setup.py install

Update

pip update:

$ pip install ddlparse --upgrade

Usage

Example

import json

from ddlparse import DdlParse

sample_ddl = """
CREATE TABLE My_Schema.Sample_Table (
  Id integer PRIMARY KEY COMMENT 'User ID',
  Name varchar(100) NOT NULL COMMENT 'User name',
  Total bigint NOT NULL,
  Avg decimal(5,1) NOT NULL,
  Point int(10) unsigned,
  Zerofill_Id integer unsigned zerofill NOT NULL,
  Created_At date, -- Oracle 'DATE' -> BigQuery 'DATETIME'
  UNIQUE (NAME)
);
"""


# parse pattern (1-1)
table = DdlParse().parse(sample_ddl)

# parse pattern (1-2) : Specify source database
table = DdlParse().parse(ddl=sample_ddl, source_database=DdlParse.DATABASE.oracle)


# parse pattern (2-1)
parser = DdlParse(sample_ddl)
table = parser.parse()

print("* BigQuery Fields * : normal")
print(table.to_bigquery_fields())


# parse pattern (2-2) : Specify source database
parser = DdlParse(ddl=sample_ddl, source_database=DdlParse.DATABASE.oracle)
table = parser.parse()


# parse pattern (3-1)
parser = DdlParse()
parser.ddl = sample_ddl
table = parser.parse()

# parse pattern (3-2) : Specify source database
parser = DdlParse()
parser.source_database = DdlParse.DATABASE.oracle
parser.ddl = sample_ddl
table = parser.parse()

print("* BigQuery Fields * : Oracle")
print(table.to_bigquery_fields())


print("* TABLE *")
print("schema = {} : name = {} : is_temp = {}".format(table.schema, table.name, table.is_temp))

print("* BigQuery Fields *")
print(table.to_bigquery_fields())

print("* BigQuery Fields - column name to lower case / upper case *")
print(table.to_bigquery_fields(DdlParse.NAME_CASE.lower))
print(table.to_bigquery_fields(DdlParse.NAME_CASE.upper))

print("* COLUMN *")
for col in table.columns.values():
    col_info = {}

    col_info["name"]                  = col.name
    col_info["data_type"]             = col.data_type
    col_info["length"]                = col.length
    col_info["precision(=length)"]    = col.precision
    col_info["scale"]                 = col.scale
    col_info["is_unsigned"]           = col.is_unsigned
    col_info["is_zerofill"]           = col.is_zerofill
    col_info["constraint"]            = col.constraint
    col_info["not_null"]              = col.not_null
    col_info["PK"]                    = col.primary_key
    col_info["unique"]                = col.unique
    col_info["auto_increment"]        = col.auto_increment
    col_info["distkey"]               = col.distkey
    col_info["sortkey"]               = col.sortkey
    col_info["encode"]                = col.encode
    col_info["default"]               = col.default
    col_info["character_set"]         = col.character_set
    col_info["bq_legacy_data_type"]   = col.bigquery_legacy_data_type
    col_info["bq_standard_data_type"] = col.bigquery_standard_data_type
    col_info["comment"]               = col.comment
    col_info["description(=comment)"] = col.description
    col_info["bigquery_field"]        = json.loads(col.to_bigquery_field())

    print(json.dumps(col_info, indent=2, ensure_ascii=False))

print("* DDL (CREATE TABLE) statements *")
print(table.to_bigquery_ddl())

print("* DDL (CREATE TABLE) statements - dataset name, table name and column name to lower case / upper case *")
print(table.to_bigquery_ddl(DdlParse.NAME_CASE.lower))
print(table.to_bigquery_ddl(DdlParse.NAME_CASE.upper))

print("* Get Column object (case insensitive) *")
print(table.columns["total"])
print(table.columns["total"].data_type)