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types.go
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types.go
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package test
import (
"database/sql"
"database/sql/driver"
"encoding/json"
"fmt"
"github.com/gotomicro/ekit"
)
// SimpleStruct 包含所有支持的类型
type SimpleStruct struct {
Id uint64
Bool bool
BoolPtr *bool
Int int
IntPtr *int
Int8 int8
Int8Ptr *int8
Int16 int16
Int16Ptr *int16
Int32 int32
Int32Ptr *int32
Int64 int64
Int64Ptr *int64
Uint uint
UintPtr *uint
Uint8 uint8
Uint8Ptr *uint8
Uint16 uint16
Uint16Ptr *uint16
Uint32 uint32
Uint32Ptr *uint32
Uint64 uint64
Uint64Ptr *uint64
Float32 float32
Float32Ptr *float32
Float64 float64
Float64Ptr *float64
Byte byte
BytePtr *byte
ByteArray []byte
String string
// 特殊类型
NullStringPtr *sql.NullString
NullInt16Ptr *sql.NullInt16
NullInt32Ptr *sql.NullInt32
NullInt64Ptr *sql.NullInt64
NullBoolPtr *sql.NullBool
// NullTimePtr *sql.NullTime
NullFloat64Ptr *sql.NullFloat64
JsonColumn *JsonColumn
}
type User struct {
Name string
}
// JsonColumn 是自定义的 JSON 类型字段
// Val 字段必须是结构体指针
// 模仿 sql.NullXXX 模式 构造一个手动转换 json 的类型
// 将 json 转换成字符串 byte[] 类型,然后存入,取出的时候 手动转换
type JsonColumn struct {
Val User
Valid bool
}
// Scan 参考 sql.NullXXX 类型定义的
func (j *JsonColumn) Scan(src any) error {
if src == nil {
return nil
}
var bs []byte
switch val := src.(type) {
case string:
bs = []byte(val)
case []byte:
bs = val
case *[]byte:
if val == nil {
return nil
}
bs = *val
default:
return fmt.Errorf("不合法类型 %+v", src)
}
if len(bs) == 0 {
return nil
}
err := json.Unmarshal(bs, &j.Val)
if err != nil {
return err
}
j.Valid = true
return nil
}
// Value 参考 sql.NullXXX 类型定义的
func (j JsonColumn) Value() (driver.Value, error) {
if !j.Valid {
return nil, nil
}
bs, err := json.Marshal(j.Val)
if err != nil {
return nil, err
}
return bs, nil
}
func NewSimpleStruct(id uint64) *SimpleStruct {
return &SimpleStruct{
Id: id,
Bool: true,
BoolPtr: ekit.ToPtr[bool](false),
Int: 12,
IntPtr: ekit.ToPtr[int](13),
Int8: 8,
Int8Ptr: ekit.ToPtr[int8](-8),
Int16: 16,
Int16Ptr: ekit.ToPtr[int16](-16),
Int32: 32,
Int32Ptr: ekit.ToPtr[int32](-32),
Int64: 64,
Int64Ptr: ekit.ToPtr[int64](-64),
Uint: 14,
UintPtr: ekit.ToPtr[uint](15),
Uint8: 8,
Uint8Ptr: ekit.ToPtr[uint8](18),
Uint16: 16,
Uint16Ptr: ekit.ToPtr[uint16](116),
Uint32: 32,
Uint32Ptr: ekit.ToPtr[uint32](132),
Uint64: 64,
Uint64Ptr: ekit.ToPtr[uint64](164),
Float32: 3.2,
Float32Ptr: ekit.ToPtr[float32](-3.2),
Float64: 6.4,
Float64Ptr: ekit.ToPtr[float64](-6.4),
Byte: byte(8),
BytePtr: ekit.ToPtr[byte](18),
ByteArray: []byte("hello"),
String: "world",
NullStringPtr: &sql.NullString{String: "null string", Valid: true},
NullInt16Ptr: &sql.NullInt16{Int16: 16, Valid: true},
NullInt32Ptr: &sql.NullInt32{Int32: 32, Valid: true},
NullInt64Ptr: &sql.NullInt64{Int64: 64, Valid: true},
NullBoolPtr: &sql.NullBool{Bool: true, Valid: true},
NullFloat64Ptr: &sql.NullFloat64{Float64: 6.4, Valid: true},
JsonColumn: &JsonColumn{
Val: User{Name: "Tom"},
Valid: true,
},
}
}