caac411e17
This commit implements multi-database support, allowing the system to switch
between SQL Server and MySQL databases seamlessly.
## New Features
- Database type selection (SQL Server or MySQL) via configuration
- Automatic table name conversion between formats ([dbo].[table] → dbo_table)
- Automatic parameter placeholder handling (? for SQL Server, %s for MySQL)
- GUI settings tab now includes database type dropdown and MySQL configuration
## Database Abstraction Layer
- db/base_connection.py: Abstract base class for database connections
- db/sqlserver_connection.py: SQL Server implementation
- db/mysql_connection.py: MySQL implementation using mysql-connector-python
- db/connection_factory.py: Factory pattern for creating connections
- db/table_name_converter.py: Table name format conversion utility
## DAO Base Class
- db/base_dao.py: Base DAO with helper methods for SQL conversion and placeholders
## Updated Components
- config/schema.py: Extended with DatabaseType enum and MySQL/SQLServer config classes
- config/defaults.py: Added MySQL default configuration
- config/loader.py: Updated to handle new database structure
- db/connection.py: Refactored to use factory pattern and load user config
- All DAO files: Updated to inherit from BaseDAO with automatic conversion
## Dependencies
- Added mysql-connector-python>=8.0.0 to requirements.txt
## Configuration
To use MySQL, set db_type to "mysql" in config/user_settings.json:
{
"database": {
"db_type": "mysql",
"mysql": {
"host": "192.168.31.83",
"port": 3306,
"database": "BLD_DB",
"username": "remote_user",
"password": "3.1415926Beeke"
}
}
}
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
85 lines
1.9 KiB
Python
85 lines
1.9 KiB
Python
"""
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数据库连接抽象基类
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定义数据库连接的通用接口
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"""
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from abc import ABC, abstractmethod
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from typing import List, Dict, Any, Optional
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class BaseDatabaseConnection(ABC):
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"""数据库连接抽象基类"""
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def __init__(self, config: Optional[Dict[str, Any]] = None):
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"""
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初始化数据库连接
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Args:
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config: 数据库配置字典
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"""
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self.config = config or {}
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self.connection = None
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@abstractmethod
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def connect(self):
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"""
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建立数据库连接
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Returns:
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数据库连接对象
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"""
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pass
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@abstractmethod
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def disconnect(self):
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"""关闭数据库连接"""
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pass
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@abstractmethod
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def execute_query(self, sql: str, params: Optional[tuple] = None) -> List[Dict[str, Any]]:
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"""
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执行查询语句并返回结果
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Args:
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sql: SQL 查询语句
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params: 查询参数（可选）
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Returns:
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List[Dict[str, Any]]: 查询结果列表，每个元素为一行数据的字典
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"""
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pass
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@abstractmethod
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def execute_update(self, sql: str, params: Optional[tuple] = None) -> int:
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"""
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执行更新/插入/删除语句
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Args:
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sql: SQL 语句
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params: 参数（可选）
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Returns:
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int: 受影响的行数
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"""
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pass
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def __enter__(self):
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"""支持 with 语句的上下文管理器入口"""
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self.connect()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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"""支持 with 语句的上下文管理器出口"""
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self.disconnect()
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@abstractmethod
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def get_placeholder(self) -> str:
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"""
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获取参数占位符
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Returns:
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参数占位符字符串（SQL Server: "?" 或 MySQL: "%s"）
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"""
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pass
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