Group/Order分组与排序

Group方法用于查询分组，Order方法用于查询排序。使用示例：

// 获取默认配置的数据库对象(配置名称为"default")
db := g.DB()

// SELECT COUNT(*) total,age FROM `user` GROUP BY age
db.Model("user").Fields("COUNT(*) total,age").Group("age").All()

// SELECT * FROM `student` ORDER BY class asc,course asc,score desc
db.Model("student").Order("class asc,course asc,score desc").All()

同时，goframe的ORM提供了一些常用的排序方法：

// 按照指定字段递增排序
func (m *Model) OrderAsc(column string) *Model
// 按照指定字段递减排序
func (m *Model) OrderDesc(column string) *Model
// 随机排序
func (m *Model) OrderRandom() *Model

使用示例：

// SELECT `id`,`title` FROM `article` ORDER BY `created_at` ASC
db.Model("article").Fields("id,title").OrderAsc("created_at").All()

// SELECT `id`,`title` FROM `article` ORDER BY `views` DESC
db.Model("article").Fields("id,title").OrderDesc("views").All()

// SELECT `id`,`title` FROM `article` ORDER BY RAND()
db.Model("article").Fields("id,title").OrderRandom().All()

Having条件过滤

Having方法用于查询结果的条件过滤。使用示例：

// SELECT COUNT(*) total,age FROM `user` GROUP BY age HAVING total>100
db.Model("user").Fields("COUNT(*) total,age").Group("age").Having("total>100").All()

// SELECT * FROM `student` ORDER BY class HAVING score>60
db.Model("student").Order("class").Having("score>?", 60).All()














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2 Comments

  1. 扶程星云

    关于group，我今天折腾了一上午，将结果写下来供大家参考。

    db := lwmain.Model.Safe()
condition := g.Map{}
if info.StartTime != "" {
    condition["xjsj >= ?"] = info.StartTime
}

if info.EndTime != "" {
    condition["xjsj <= ?"] = info.EndTime
}

if info.Site != "" {
    condition["dd like ?"] = "%" + info.Site + "%"
}

dbMap,_ := db.Fields("ID").Where(condition).Group(info.GroupKey).Fields("count(ID),"+info.GroupKey).All()

    其中，第一个Fields是要count的字段，第二个Fields是最外层的select字段列表。 解析出来的sql语句是：

    SELECT count(ID),`sj` FROM `lwmain` WHERE xjsj >= '2021-01-22 00:00:00' AND xjsj <= '2021-05-22 00:00:00' GROUP BY `sj`

    1. 郭强

      建议：

      model := dao.lwmain
if info.StartTime != "" {
    model = model.WhereGE(dao.lwmain.Columns.Xjsj, info.StartTime)
}

if info.EndTime != "" {
    model = model.WhereLE(dao.lwmain.Columns.Xjsj, info.EndTime)
}

if info.Site != "" {
    model = model.WhereLike(dao.lwmain.Columns.Dd, "%" + info.Site + "%")
}

dbMap, _ := model.Fields("count(ID)"+","+info.GroupKey).Group(info.GroupKey).All()