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fix: Binary.Scan 复制驱动返回的字节切片，避免连接读缓冲复用导致 BLOB 数据错乱 #40

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Merged
helays merged 1 commit into from
Oct 29, 2026
Merged

fix: Binary.Scan 复制驱动返回的字节切片，避免连接读缓冲复用导致 BLOB 数据错乱 #40

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6 changes: 4 additions & 2 deletions dataType/file.go
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Original file line number Diff line number Diff line change
Expand Up @@ -21,8 +21,10 @@ func (bf *Binary) Scan(value interface{}) error {
if !ok {
return errors.New("type assertion to []byte failed")
}

*bf = bytes
// 必须复制：database/sql 会把驱动返回的 []byte 原样交给 Scanner，
// 而 go-sql-driver/mysql 的结果切片指向连接读缓冲，后续任何查询都会覆盖它。
// 直接持有（*bf = src）会导致读出的 BLOB 在下一次查询后变成另一行的内容。
*bf = append([]byte(nil), bytes...)
return nil
}

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