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GORM 剖析与最佳实践
张⾦柱 @ 字节跳动
GORM - The fantastic ORM library for Golang
ABOUT ME
• Github: @jinzhu
• 字节跳动:@zhangjinzhu
• GORM 官⽹:https://gorm.io
https://gorm.cn(国内 CDN)
Jinzhu / 张⾦柱
GORM 剖析与最佳实践 - ⼤纲
• GORM 五分钟快速⼊⻔
• SQL 是怎么⽣成的(Locking,Optimizer Hints,Batch Upsert)
• 插件是怎么⼯作的(读写分离,Open Tracing,压测平台)
• 最佳实践 & FAQ
GORM 五分钟快速⼊⻔ - 初始化
GORM 五分钟快速⼊⻔ - 常⻅⽤法
SQL是怎么⽣成的 (SQL Statement & Clauses)
SQL是怎么⽣成的 (SQL Statement & Clauses)
SQLSTATEMENT
SELECT Clause
FROM Clause
WHERE Clause
ORDER BY Clause
LIMIT Clause
FOR Clause
expression
expression
SQL是怎么⽣成的 (GORM Statement & Clauses)
STATEMENT
SELECT Clause
FROM Clause
WHERE Clause
ORDER BY Clause
LIMIT Clause
SQL是怎么⽣成的 - 使⽤ Clause / 修改 Clause Builder - Locking
SELECT SQL + Locking Clause
Locking Clause ⽣成不同 SQL
SQL是怎么⽣成的 - Clause 钩⼦ - Hints
添加到 SELECT Clause 后
添加到 FORM Clause 后
Before, After Name, After 某 Clause
SQL是怎么⽣成的 - 修改 Clause / 重新组装 Clause - Batch Upsert
批量插⼊
批量插⼊ & 忽略错误
批量插⼊ || 更新现有数据
批量插⼊ || 更新现有数据
插件是怎么⼯作的 - GORM Callbacks
执⾏ Create 的过程
取出注册的 Create Callbacks 并调⽤
GORM Callbacks ⽀持 Create, Update,
Delete, Query, Row, Raw 六种 Callbacks
插件是怎么⼯作的 - GORM Callbacks
GORM 默认
Create Callbacks
GORM Callbacks API
指定 Callbacks 顺序
插件是怎么⼯作的 - GORM Callbacks - OpenTracing
插件是怎么⼯作的 - GORM Callbacks - 多数据库/读写分离
db2 为主数据库(全局)
db3, db4 为从数据库(全局)
db5 为从数据库,默认连接 db1 为主数据库 (User,Address)
注册 GORM Callbacks
指定写模式
指定策略组 secondary
指定写模式 + 策略组
插件是怎么⼯作的 - Callbacks/Hooks API
插件是怎么⼯作的 - Callbacks/Hooks API
最佳实践 & FAQ - 更新零值问题
⽅法 1
⽅法 2
⽅法 3
⽅法 4
最佳实践 & FAQ - 使⽤ SQL 表达式创建/更新数据
通过 Map 使⽤
SQL 表达式创建
通过 struct ⽤
SQL 表达式
最佳实践 & FAQ - ⾃定义数据类型 / 使⽤ SQL 表达式查询数据
⾃定义类型
SQL 表达式查询
最佳实践 & FAQ - 共享代码
共享分⻚逻辑代码
最佳实践 & FAQ - 数据库事务
关闭全局默认事务
会话关闭默认事务
嵌套事务
事务代码块
最佳实践 & FAQ - 字段权限设置
字段读、创建、更新权限
⽆创建权限
⽆读取权限
未创建
最佳实践 & FAQ - 关联模型定义
User 拥有⼀个 Account (has one), 拥有多个 Pets (has many), 多个 Toys (多态 has many)
属于某 Company (belongs to) 属于某 Manager (单表 belongs to) 管理 Team (单表 has many)
会多种 Languages (many to many) 拥有很多 Friends (单表 many to many)
并且他的 Pet 也有⼀个玩具 Toy (多态 has one)
最佳实践 & FAQ - 关联模式
关联模式常⻅操作
最佳实践 & FAQ - 关联模式预加载
最佳实践 & FAQ - To Be Continue
• 关联模式批量操作 / 关联的级联删除
• 数据库连接参数
• 分库分表
• CreateInBatches
• Find To Map
• Sub Query / From Sub Query / SQL Builder
• Group Conditions
• Iteration / Find In Batches
• Prepared Statements
• 默认值问题 / 虚拟字段
• Soft Delete
• gorm.Config
• 修改默认命名策略
• Logger
• New Driver Support
• Session Mode
• Time Tracking (Unix Seconds/Milli/Nano Seconds)
• Hooks
• DryRun Mode
• 复合主键
• Indexes / Checker
• Prometheus
• Performance
• …
GORM 剖析与最佳实践
GORM 剖析与最佳实践
Q&A

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