Golang开发使用gorm时打印SQL语句方式

package main

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

type User struct {
    ID   int
    Name string
}

func main() {
    dsn := "user:password@tcp(127.0.0.1:3306)/dbname?charset=utf8mb4&parseTime=True&loc=Local"
    db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
    if err != nil {
        panic("failed to connect database")
    }

    var users []User
    // 使用 Debug() 方法
    db.Debug().Where("name = ?", "John").Find(&users)

    fmt.Println(users)
}

package main

import (
    "log"
    "time"
    "gorm.io/driver/mysql"
    "gorm.io/gorm"
    "gorm.io/gorm/logger"
)

type User struct {
    ID   int
    Name string
}

func main() {
    dsn := "user:password@tcp(127.0.0.1:3306)/dbname?charset=utf8mb4&parseTime=True&loc=Local"
    newLogger := logger.New(
        log.New(log.Writer(), "\r\n", log.LstdFlags), // io writer
        logger.Config{
            SlowThreshold: time.Second,   // 慢 SQL 阈值
            LogLevel:      logger.Info,   // 日志级别
            IgnoreRecordNotFoundError: true, // 忽略ErrRecordNotFound（记录未找到）错误
            Colorful:      true,          // 启用彩色打印
        },
    )

    db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
        Logger: newLogger,
    })
    if err != nil {
        panic("failed to connect database")
    }

    var users []User
    db.Where("name = ?", "John").Find(&users)

    fmt.Println(users)
}

package main

import (
    "log"
    "time"
    "gorm.io/driver/mysql"
    "gorm.io/gorm"
    "gorm.io/gorm/logger"
    "gorm.io/gorm/utils"
)

type CustomLogger struct {
    logger.Interface
}

func (c *CustomLogger) Info(ctx context.Context, msg string, data ...interface{}) {
    log.Printf("[INFO] "+msg, data...)
}

func (c *CustomLogger) Warn(ctx context.Context, msg string, data ...interface{}) {
    log.Printf("[WARN] "+msg, data...)
}

func (c *CustomLogger) Error(ctx context.Context, msg string, data ...interface{}) {
    log.Printf("[ERROR] "+msg, data...)
}

// 追踪并输出 sql 的详细信息：sql 语句、绑定的参数、执行时间等。
func (c *CustomLogger) Trace(ctx context.Context, begin time.Time, fc func() (string, int64), err error) {
    elapsed := time.Since(begin)
    sql, rows := fc()
    log.Printf("[SQL] %s [rows:%d] [elapsed:%s] [error:%v]\n", sql, rows, elapsed, err)
}

func main() {
    dsn := "user:password@tcp(127.0.0.1:3306)/dbname?charset=utf8mb4&parseTime=True&loc=Local"
    customLogger := &CustomLogger{}

    db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
        Logger: customLogger,
    })
    if err != nil {
        panic("failed to connect database")
    }

    var users []User
    db.Where("name = ?", "John").Find(&users)

    fmt.Println(users)
}