go应用专题：gorm

参考：

http://books.studygolang.com/gorm/models.html（api）

https://gorm.io/docs/ （官方）

https://gorm.io/driver/mysql（官方）

引入包

import (
  "gorm.io/driver/mysql"
  "gorm.io/gorm"
)

 

连接数据库

//基本
dsn := "user:pass@tcp(127.0.0.1:3306)/dbname?charset=utf8mb4&parseTime=True&loc=Local"
  db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})

//更多选项
db, err := gorm.Open(mysql.New(mysql.Config{
  DSN: "gorm:gorm@tcp(127.0.0.1:3306)/gorm?charset=utf8&parseTime=True&loc=Local", // data source name
  DefaultStringSize: 256, // default size for string fields
  DisableDatetimePrecision: true, // disable datetime precision, which not supported before MySQL 5.6
  DontSupportRenameIndex: true, // drop & create when rename index, rename index not supported before MySQL 5.7, MariaDB
  DontSupportRenameColumn: true, // `change` when rename column, rename column not supported before MySQL 8, MariaDB
  SkipInitializeWithVersion: false, // auto configure based on currently MySQL version
}), &gorm.Config{})

连接池

参考：https://www.cnblogs.com/frankfud/p/13605842.html

GORM using database/sql to maintain connection pool

sqlDB, err := db.DB()

// SetMaxIdleConns sets the maximum number of connections in the idle connection pool.
sqlDB.SetMaxIdleConns(10)

// SetMaxOpenConns sets the maximum number of open connections to the database.
sqlDB.SetMaxOpenConns(100)

// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
sqlDB.SetConnMaxLifetime(time.Hour)

 

原生sql

参考：https://gorm.io/docs/sql_builder.html

ddl数据定义：数据库，表，字段，索引

参考：https://gorm.io/docs/migration.html

dml和dql：curd

参考：https://gorm.io/docs/create.html

TCL：事务

参考：https://gorm.io/docs/transactions.html

模型关联

参考：https://gorm.io/docs/belongs_to.html