sql syntax error

[fun-li]

• gorm version:v1.23.8
• database:Mysql
• table structure

When I use gorm, the following sql statement is generated, it cannot be executed normally, but it is executed normally in the mysql client. At first, it is suspected that it is a database-driven problem. Use github.com/go-sql-driver/mysql driver It can be executed normally, I want to ask if it is a problem with gorm.

type VerificationSource struct {
    BaseModel
    Name         string                              `json:"name,omitempty"`
    Resource     string                              `json:"resource,omitempty"`
    ResourceType verificationenum.VerificationSource `json:"resourceType,omitempty" gorm:"column:type"`
}
type BaseModel struct {
    ID         uint                  `gorm:"primaryKey;comment:id" json:"id,omitempty"`
    CreateBy   string                `json:"createBy"`
    UpdateBy   string                `json:"updateBy"`
    CreateTime time.Time             `gorm:"comment:创建时间;autoCreateTime" json:"createTime"` // 在创建时，如果该字段值为零值，则使用当前时间填充
    UpdateTime time.Time             `gorm:"comment:更新时间;autoCreateTime" json:"updateTime"` // 在创建时该字段值为零值或者在更新时，使用当前时间戳秒数填充
    DeleteFlag soft_delete.DeletedAt `gorm:"softDelete:flag;DeletedAtField:delete_flag" json:"-"`
}
//grom 
sources := make([]model.VerificationSource, 0)
_ = ver.Select("resource").Where("resource is not ? ", nil).Find(sources)
//generated sql :SELECT resource FROM `li_verification_source` WHERE resource is not NULL  AND `li_verification_source`.`delete_flag` = 0

Error message :Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '? AND li_verification_source.delete_flag = ?' at line 1

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[a631807682]

This is obviously a problematic prepare statement, which cannot be created successfully, not only on https://github.com/go-sql-driver/mysql, but also on mysql itself.

SELECT resource FROM verification_sources WHERE resource is not ?