298 lines
11 KiB
Python
298 lines
11 KiB
Python
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#!/usr/bin/env python3
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"""
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Database Schema Generator
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Converts analyzed requirements into database schema files
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"""
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import json
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import sys
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import argparse
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from typing import Dict, List, Any
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class SchemaGenerator:
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def __init__(self, framework: str = "prisma"):
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self.framework = framework
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def generate_from_entities(self, entities: List[Dict[str, Any]]) -> str:
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"""Generate schema from entity definitions"""
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if self.framework == "prisma":
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return self._generate_prisma(entities)
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elif self.framework == "sqlalchemy":
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return self._generate_sqlalchemy(entities)
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elif self.framework == "typeorm":
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return self._generate_typeorm(entities)
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elif self.framework == "sql":
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return self._generate_sql(entities)
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else:
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raise ValueError(f"Unsupported framework: {self.framework}")
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def _generate_prisma(self, entities: List[Dict[str, Any]]) -> str:
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"""Generate Prisma schema"""
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schema = """datasource db {
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provider = "postgresql"
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url = env("DATABASE_URL")
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}
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generator client {
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provider = "prisma-client-js"
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}
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"""
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for entity in entities:
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schema += f"model {entity['name']} {{\n"
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# Add fields
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for field in entity['fields']:
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field_type = self._map_type_prisma(field['type'])
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modifiers = []
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if field.get('primary'):
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modifiers.append("@id @default(uuid())")
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if field.get('unique'):
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modifiers.append("@unique")
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if field.get('required', True):
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field_type += ""
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else:
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field_type += "?"
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if field.get('default'):
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modifiers.append(f"@default({field['default']})")
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modifier_str = " ".join(modifiers)
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schema += f" {field['name']} {field_type} {modifier_str}\n"
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# Add relationships
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for rel in entity.get('relationships', []):
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rel_type = f"{rel['target']}[]" if rel['type'] == 'many' else rel['target']
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if rel['type'] == 'one':
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rel_type += "?"
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schema += f" {rel['name']} {rel_type}\n"
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# Add timestamps
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schema += " createdAt DateTime @default(now())\n"
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schema += " updatedAt DateTime @updatedAt\n"
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schema += "}\n\n"
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return schema
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def _generate_sqlalchemy(self, entities: List[Dict[str, Any]]) -> str:
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"""Generate SQLAlchemy models"""
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code = """from sqlalchemy import Column, String, Integer, Boolean, DateTime, ForeignKey, Text
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from sqlalchemy.dialects.postgresql import UUID
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from sqlalchemy.orm import relationship
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from sqlalchemy.ext.declarative import declarative_base
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from datetime import datetime
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import uuid
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Base = declarative_base()
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"""
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for entity in entities:
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code += f"class {entity['name']}(Base):\n"
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code += f" __tablename__ = '{entity['name'].lower()}s'\n\n"
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# Add fields
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for field in entity['fields']:
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col_type = self._map_type_sqlalchemy(field['type'])
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constraints = []
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if field.get('primary'):
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constraints.append("primary_key=True")
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constraints.append("default=uuid.uuid4")
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if field.get('unique'):
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constraints.append("unique=True")
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if field.get('required', True):
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constraints.append("nullable=False")
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constraint_str = ", ".join(constraints)
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code += f" {field['name']} = Column({col_type}, {constraint_str})\n"
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# Add timestamps
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code += " created_at = Column(DateTime, default=datetime.utcnow, nullable=False)\n"
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code += " updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)\n"
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# Add relationships
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for rel in entity.get('relationships', []):
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code += f" {rel['name']} = relationship('{rel['target']}')\n"
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code += "\n"
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return code
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def _generate_typeorm(self, entities: List[Dict[str, Any]]) -> str:
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"""Generate TypeORM entities"""
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code = """import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn, ManyToOne, OneToMany } from 'typeorm';
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"""
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for entity in entities:
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code += "@Entity()\n"
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code += f"export class {entity['name']} {{\n"
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# Add fields
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for field in entity['fields']:
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decorators = []
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if field.get('primary'):
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decorators.append(" @PrimaryGeneratedColumn('uuid')")
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else:
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col_type = self._map_type_typescript(field['type'])
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options = []
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if field.get('unique'):
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options.append("unique: true")
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if not field.get('required', True):
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options.append("nullable: true")
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option_str = f", {{ {', '.join(options)} }}" if options else ""
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decorators.append(f" @Column('{col_type}'{option_str})")
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ts_type = self._map_type_typescript(field['type'])
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nullable = "" if field.get('required', True) else " | null"
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code += "\n".join(decorators) + "\n"
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code += f" {field['name']}: {ts_type}{nullable};\n\n"
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# Add timestamps
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code += " @CreateDateColumn()\n"
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code += " createdAt: Date;\n\n"
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code += " @UpdateDateColumn()\n"
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code += " updatedAt: Date;\n"
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code += "}\n\n"
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return code
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def _generate_sql(self, entities: List[Dict[str, Any]]) -> str:
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"""Generate SQL DDL"""
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sql = "-- Database Schema\n\n"
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for entity in entities:
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table_name = entity['name'].lower() + 's'
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sql += f"CREATE TABLE {table_name} (\n"
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fields = []
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# Add fields
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for field in entity['fields']:
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col_type = self._map_type_sql(field['type'])
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constraints = []
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if field.get('primary'):
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constraints.append("PRIMARY KEY")
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constraints.append("DEFAULT gen_random_uuid()")
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if field.get('unique'):
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constraints.append("UNIQUE")
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if field.get('required', True):
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constraints.append("NOT NULL")
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constraint_str = " ".join(constraints)
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fields.append(f" {field['name']} {col_type} {constraint_str}")
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# Add timestamps
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fields.append(" created_at TIMESTAMP DEFAULT NOW() NOT NULL")
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fields.append(" updated_at TIMESTAMP DEFAULT NOW() NOT NULL")
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sql += ",\n".join(fields)
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sql += "\n);\n\n"
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# Add indexes for foreign keys
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for rel in entity.get('relationships', []):
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if rel.get('foreign_key'):
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sql += f"CREATE INDEX idx_{table_name}_{rel['name']} ON {table_name}({rel['name']}_id);\n"
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sql += "\n"
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return sql
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def _map_type_prisma(self, field_type: str) -> str:
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"""Map generic type to Prisma type"""
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mapping = {
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'string': 'String',
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'text': 'String',
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'integer': 'Int',
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'float': 'Float',
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'boolean': 'Boolean',
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'date': 'DateTime',
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'datetime': 'DateTime',
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'uuid': 'String',
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'json': 'Json'
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}
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return mapping.get(field_type.lower(), 'String')
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def _map_type_sqlalchemy(self, field_type: str) -> str:
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"""Map generic type to SQLAlchemy type"""
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mapping = {
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'string': 'String(255)',
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'text': 'Text',
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'integer': 'Integer',
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'float': 'Float',
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'boolean': 'Boolean',
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'date': 'DateTime',
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'datetime': 'DateTime',
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'uuid': 'UUID(as_uuid=True)',
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'json': 'JSON'
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}
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return mapping.get(field_type.lower(), 'String(255)')
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def _map_type_typescript(self, field_type: str) -> str:
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"""Map generic type to TypeScript type"""
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mapping = {
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'string': 'string',
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'text': 'string',
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'integer': 'number',
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'float': 'number',
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'boolean': 'boolean',
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'date': 'Date',
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'datetime': 'Date',
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'uuid': 'string',
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'json': 'object'
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}
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return mapping.get(field_type.lower(), 'string')
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def _map_type_sql(self, field_type: str) -> str:
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"""Map generic type to SQL type"""
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mapping = {
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'string': 'VARCHAR(255)',
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'text': 'TEXT',
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'integer': 'INTEGER',
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'float': 'DECIMAL(10,2)',
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'boolean': 'BOOLEAN',
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'date': 'DATE',
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'datetime': 'TIMESTAMP',
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'uuid': 'UUID',
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'json': 'JSONB'
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}
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return mapping.get(field_type.lower(), 'VARCHAR(255)')
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def main():
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parser = argparse.ArgumentParser(description='Generate database schema from entity definitions')
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parser.add_argument('--input', required=True, help='JSON file with entity definitions')
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parser.add_argument('--framework', default='prisma',
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choices=['prisma', 'sqlalchemy', 'typeorm', 'sql'],
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help='Target framework/format')
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parser.add_argument('--output', help='Output file (default: stdout)')
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args = parser.parse_args()
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# Load entities
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with open(args.input, 'r') as f:
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data = json.load(f)
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entities = data if isinstance(data, list) else data.get('entities', [])
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# Generate schema
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generator = SchemaGenerator(args.framework)
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schema = generator.generate_from_entities(entities)
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# Output
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if args.output:
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with open(args.output, 'w') as f:
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f.write(schema)
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print(f"✅ Schema generated: {args.output}")
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else:
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print(schema)
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if __name__ == '__main__':
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main()
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