加载器与关系 Model Loader Loader Expression Many-to-One Relationship Self Referencing Other Relationships Advanced Usage of Loaders 加载器与关系 Loaders are used to load database row...

声明模型 简单示例 一对多(one-to-many)关系 多对多(many-to-many)关系 声明模型 通常下，Flask-SQLAlchemy 的行为就像一个来自 declarative 扩展配置正确的 declarative 基类。因此，我们强烈建议您阅读 SQLAlchemy 文档以获取一个全面的参考。尽管如此，我们这里还是给出了...

Disable Default Transaction Transaction Nested Transactions Control the transaction manually A Specific Example SavePoint, RollbackTo Disable Default Transaction GORM perfo...

The DAL: A quick tour The DAL: A quick tour web2py defines the following classes that make up the DAL: The DAL object represents a database connection. For example: db = D...

Transactions CodeIgniter’s Approach to Transactions Running Transactions Strict Mode Managing Errors Disabling Transactions Test Mode Running Transactions Manually Trans...

Advanced Usage Error Handling Transactions A Specific Example SQL Builder Run Raw SQL sql.Row & sql.Rows Scan sql.Rows In Iteration Generic database interface sql.DB Connec...

数据库 连接数据库 {#dbc} MySQL PostgreSQL Sqlite3 不支持的数据库 迁移 {#m} 自动迁移 检查表是否存在 创建表 删除表 修改列 删除列 添加外键 索引 数据库 连接数据库 {#dbc} 要连接到数据库首先要导入驱动程序。例如 import _ "github.com/go-s...

Development Architecture Write Plugins Register a new callback Delete an existing callback Replace an existing callback Register callback orders Pre-Defined Callbacks De...

Database Connecting to a database MySQL PostgreSQL Sqlite3 SQL Server Write Dialect for unsupported databases Migration Auto Migration Has Table Create Table Drop table ...

Auto Migration Migrator Interface CurrentDatabase Tables Columns Constraints Indexes Constraints Other Migration Tools Auto Migration Automatically migrate your schema, ...