type User struct {
    Name  string `gorm:"index"`
    Name2 string `gorm:"index:idx_name,unique"`
    Name3 string `gorm:"index:,sort:desc,collate:utf8,type:btree,length:10,where:name3 != 'jinzhu'"`
    Name4 string `gorm:"uniqueIndex"`
    Age   int64  `gorm:"index:,class:FULLTEXT,comment:hello \\, world,where:age > 10"`
    Age2  int64  `gorm:"index:,expression:ABS(age)"`
}

// MySQL 选项
type User struct {
    Name string `gorm:"index:,class:FULLTEXT,option:WITH PARSER ngram INVISIBLE"`
}

// PostgreSQL 选项
type User struct {
    Name string `gorm:"index:,option:CONCURRENTLY"`
}

type User struct {
    Name1 string `gorm:"uniqueIndex"`
    Name2 string `gorm:"uniqueIndex:idx_name,sort:desc"`
}

// create composite index `idx_member` with columns `name`, `number`
type User struct {
    Name   string `gorm:"index:idx_member"`
    Number string `gorm:"index:idx_member"`
}

type User struct {
    Name   string `gorm:"index:idx_member"`
    Number string `gorm:"index:idx_member"`
}
// column order: name, number

type User struct {
    Name   string `gorm:"index:idx_member,priority:2"`
    Number string `gorm:"index:idx_member,priority:1"`
}
// column order: number, name

type User struct {
    Name   string `gorm:"index:idx_member,priority:12"`
    Number string `gorm:"index:idx_member"`
}
// column order: number, name

type Foo struct {
  IndexA int `gorm:"index:,unique,composite:myname"`
  IndexB int `gorm:"index:,unique,composite:myname"`
}

type Bar0 struct {
  Foo
}

type Bar1 struct {
  Foo
}

type UserIndex struct {
    OID          int64  `gorm:"index:idx_id;index:idx_oid,unique"`
    MemberNumber string `gorm:"index:idx_id"`
}