err {"error":"sql: Scan error on column index 0, name \"mobile\": converting NULL to string is unsupported"} 总结: 根据项目需要,在数据库查询时,可能需要对查询结果进行封装,为避免前端抛出空指针异常(NullPointException),对于没有值的字段也不能返回空,而应该赋一个默认值,在使用 MYSQL 作为数据库...
go-gorm/playground#113 I can't reopen my last issue (#3363), but after the changes made to allow NULL as default value, I'm getting Error: sql: Scan error on column index 0, name "value": converting NULL to string is unsupported using Po...
因此,total列的值将为NULL。 数据库中存在NULL值:如果amount列中存在NULL值,并且在查询中没有处理NULL值的情况,那么计算总和时将返回NULL。 解决方法 复制代码 import"database/sql"vartotal sql.NullFloat64 res := db.Model(&model.Record{}).Select("COALESCE(sum(amount), 0) as total").Where("id = ...
sql: Scan error on column index 0, name "COMMENTS": converting NULL to string is unsupported Signed-off-by: liutianqi <zixizixi@vip.qq.com>Loading branch information iTanken committed Dec 25, 2023 1 parent 3e766cf commit 0fe897c Showing...
"convertingdriver.Valuetype%T(%q)toa%s:%v",src,s,dv.Kind(),err)}dv.SetFloat(f64)returnnilcasereflect.String:ifsrc==nil{returnfmt.Errorf("convertingNULLto%sisunsupported",dv.Kind())}switchv:=src.(type){casestring:dv.SetString(v)returnnilcase[]byte:dv.SetString(string(v)...
摘要:场景:查询时报错 err {"error": "sql: Scan error on column index 0, name \"mobile\": converting NULL to string is unsupported"} 总结: 根据项目需要,在数据库查询时,可能需要对查询结果进行封 阅读全文 posted @ 2023-06-06 19:58 李若盛开 阅读(603) 评论(0) 推荐(0) 编辑 Gorm - ...
A sql like "select 'http://127.0.0.1?name=aaa' as url, name from test t where name = @name" which has "?" will lead to an error: sql: converting argument $1 type: unsupported type map[string]interface {}, a map dsn := "u:p@tcp(ip:3306)/t...