如何使用GORM创建或更新记录? [英] How to Create or Update a record with GORM?

问题描述

Gorm有一个FirstOrCreate方法和一个FirstOrInit，但是之后如何检查记录是否真正创建了呢?我想创建一条不存在的记录，如果存在，我想更新一些字段.

Gorm has a FirstOrCreate method and a FirstOrInit but how to check afterwards if the record was actually created? I like to create a record if it does not exists and if it exists I want to update some fields.

推荐答案

FirstOrInit和FirstOrCreate是不同的.如果数据库中没有匹配的记录，则FirstOrInit将初始化struct但不创建记录，FirstOrCreate将创建一个记录并查询该记录以获取struct.

FirstOrInit and FirstOrCreate are different. If there is no match record in database, FirstOrInit will init struct but not create record, FirstOrCreate will create a record and query that record to struct.

所以让我们回到您的问题上.如何更新或创建?

So let's back to you question. How to update or create?

答案

var user User
if err := db.Where("name = ?", "xxxx").First(&user).Error; err != nil {
    // error handling...
    if gorm.IsRecordNotFoundError(err){
        db.Create(&newUser)  // newUser not user
    }
}else{
    db.Model(&user).Where("id = ?", 3333).Update("name", "nick")
}

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