日志记录器
原文：https://gorm.io/docs/logger.html
Gorm has a default logger implementation, it will print Slow SQL and happening errors by default
Gorm有一个默认的日志记录器实现，默认情况下会打印慢SQL和发生的错误。
The logger accepts few options, you can customize it during initialization, for example:
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| newLogger := logger.New(
log.New(os.Stdout, "\r\n", log.LstdFlags), // io writer
logger.Config{
SlowThreshold: time.Second, // Slow SQL阈值 Slow SQL threshold
LogLevel: logger.Silent, // Log级别 Log level
IgnoreRecordNotFoundError: true, // 为日志记录器忽略ErrRecordNotFound错误 Ignore ErrRecordNotFound error for logger
ParameterizedQueries: true, // 不在SQL日志中包含参数 Don't include params in the SQL log
Colorful: false, // 禁用颜色 Disable color
},
)
// 全局模式 Globally mode
db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{
Logger: newLogger,
})
// 连续会话模式 Continuous session mode
tx := db.Session(&Session{Logger: newLogger})
tx.First(&user)
tx.Model(&user).Update("Age", 18)
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日志级别 Log Levels
GORM defined log levels: Silent, Error, Warn, Info
GORM定义了以下日志级别：Silent，Error，Warn，Info
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| db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{
Logger: logger.Default.LogMode(logger.Silent),
})
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调试 Debug
Debug a single operation, change current operation’s log level to logger.Info
调试单个操作，将当前操作的日志级别更改为logger.Info
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| db.Debug().Where("name = ?", "jinzhu").First(&User{})
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自定义日志记录器 Customize Logger
Refer to GORM’s default logger for how to define your own one
参考GORM的默认日志记录器以了解如何定义自己的一个
The logger needs to implement the following interface, it accepts context, so you can use it for log tracing
日志记录器需要实现以下接口，它接受context，因此您可以将其用于日志追踪。
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| type Interface interface {
LogMode(LogLevel) Interface
Info(context.Context, string, ...interface{})
Warn(context.Context, string, ...interface{})
Error(context.Context, string, ...interface{})
Trace(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error)
}
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