152 lines
5.1 KiB
Python
152 lines
5.1 KiB
Python
import os
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from flask import Flask, request, jsonify, g
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from sqlalchemy import (
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create_engine, MetaData, Table, select, insert, update, delete, text
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)
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from sqlalchemy.exc import SQLAlchemyError
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from waitress import serve
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app = Flask(__name__)
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# 数据库配置
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DATABASE_URL = os.environ.get('DATABASE_URL', 'sqlite:///database.db')
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engine = create_engine(DATABASE_URL)
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# 缓存反射的元数据（避免每次请求都反射）
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metadata = MetaData()
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def get_table(table_name):
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"""反射表对象（若已缓存则直接返回）"""
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if table_name not in metadata.tables:
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Table(table_name, metadata, autoload_with=engine)
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return metadata.tables[table_name]
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def build_where(table, conditions):
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"""将条件字典转换为 SQLAlchemy 条件表达式"""
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if not conditions:
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return None
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clauses = []
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for col, val in conditions.items():
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column = table.columns[col]
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if isinstance(val, dict):
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# 支持多种比较操作
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if 'eq' in val:
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clauses.append(column == val['eq'])
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if 'ne' in val:
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clauses.append(column != val['ne'])
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if 'gt' in val:
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clauses.append(column > val['gt'])
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if 'lt' in val:
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clauses.append(column < val['lt'])
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if 'ge' in val:
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clauses.append(column >= val['ge'])
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if 'le' in val:
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clauses.append(column <= val['le'])
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if 'like' in val:
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clauses.append(column.like(val['like']))
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if 'in' in val:
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clauses.append(column.in_(val['in']))
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else:
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# 直接等值比较
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clauses.append(column == val)
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from sqlalchemy import and_
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return and_(*clauses)
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@app.route('/execute', methods=['POST'])
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def execute_structured():
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data = request.get_json()
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if not data:
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return jsonify({'success': False, 'error': '请求体不能为空'}), 400
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action = data.get('action', 'select')
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table_name = data.get('table')
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if not table_name:
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return jsonify({'success': False, 'error': '缺少 table 字段'}), 400
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try:
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table = get_table(table_name)
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except Exception as e:
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return jsonify({'success': False, 'error': f'表加载失败: {str(e)}'}), 400
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conn = None
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try:
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conn = engine.connect()
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result = []
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if action == 'select':
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columns = data.get('columns', None)
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if columns:
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cols = [table.columns[c] for c in columns]
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else:
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cols = [table] # select *
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stmt = select(*cols)
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where_cond = build_where(table, data.get('where'))
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if where_cond is not None:
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stmt = stmt.where(where_cond)
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# 排序
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order_by = data.get('order_by')
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if order_by:
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for item in order_by:
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col = table.columns[item['column']]
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stmt = stmt.order_by(col.desc() if item.get('desc') else col.asc())
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# 分页
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limit = data.get('limit')
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if limit is not None:
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stmt = stmt.limit(limit)
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offset = data.get('offset')
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if offset is not None:
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stmt = stmt.offset(offset)
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res = conn.execute(stmt)
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rows = res.fetchall()
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result = [dict(row._mapping) for row in rows]
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elif action == 'insert':
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values = data.get('values', {})
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stmt = insert(table).values(**values)
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res = conn.execute(stmt)
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conn.commit()
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result = [{'lastrowid': res.lastrowid}] if hasattr(res, 'lastrowid') else []
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elif action == 'update':
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values = data.get('values', {})
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where_cond = build_where(table, data.get('where'))
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stmt = update(table).values(**values)
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if where_cond is not None:
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stmt = stmt.where(where_cond)
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res = conn.execute(stmt)
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conn.commit()
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result = [{'rowcount': res.rowcount}]
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elif action == 'delete':
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where_cond = build_where(table, data.get('where'))
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stmt = delete(table)
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if where_cond is not None:
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stmt = stmt.where(where_cond)
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res = conn.execute(stmt)
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conn.commit()
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result = [{'rowcount': res.rowcount}]
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else:
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return jsonify({'success': False, 'error': f'不支持的操作: {action}'}), 400
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return jsonify({'success': True, 'data': result})
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except SQLAlchemyError as e:
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if conn:
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conn.rollback()
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return jsonify({'success': False, 'error': str(e)}), 400
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except Exception as e:
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if conn:
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conn.rollback()
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return jsonify({'success': False, 'error': str(e)}), 400
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finally:
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if conn:
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conn.close()
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if __name__ == '__main__':
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# 单线程单进程，绑定 127.0.0.1
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serve(app, host='127.0.0.1', port=8005, threads=1)
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