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Support the AUTO_RANDOM Field #104

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merged 3 commits into from
Jan 31, 2023
Merged

Support the AUTO_RANDOM Field #104

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0b09873
feat: support auto_random through default tag
Jan 29, 2023
120c47f
fix: unsigned type support
Jan 30, 2023
b3a1a34
fix: keeping the HasDefaultValue value is true for auto_random
Jan 30, 2023
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34 changes: 34 additions & 0 deletions mysql.go
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,10 @@ import (
"gorm.io/gorm/utils"
)

const (
AutoRandomTag = "auto_random()" // Treated as an auto_random field for tidb
)

type Config struct {
DriverName string
ServerVersion string
Expand Down Expand Up @@ -417,7 +421,37 @@ func (dialector Dialector) getSchemaBytesType(field *schema.Field) string {
return "longblob"
}

// autoRandomType
// field.DataType MUST be `schema.Int` or `schema.Uint`
// Judgement logic:
// 1. Is PrimaryKey;
// 2. Has default value;
// 3. Default value is "auto_random()";
// 4. IGNORE the field.Size, it MUST be bigint;
// 5. CLEAR the default tag, and return true;
// 6. Otherwise, return false.
func autoRandomType(field *schema.Field) (bool, string) {
if field.PrimaryKey && field.HasDefaultValue &&
strings.ToLower(strings.TrimSpace(field.DefaultValue)) == AutoRandomTag {
field.HasDefaultValue = false
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Why do we need to set HasDefaultValue to false, it should be true?

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We used this tag default:auto_random() to implement the auto_random feature. But it is actually not a default value. It's a field like auto_increment.

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for auto_increment fields we also marked them as HasDefaultValue, e.g:

https://github.com/go-gorm/gorm/blob/d834dd60b715422dc2a900fb2744f9c278a9830f/schema/field.go#L113

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Ah, got it. I made a mistake.

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Fixed. PTAL again.

field.DefaultValue = ""

sqlType := "bigint"
if field.DataType == schema.Uint {
sqlType += " unsigned"
}
sqlType += " auto_random"
return true, sqlType
}

return false, ""
}

func (dialector Dialector) getSchemaIntAndUnitType(field *schema.Field) string {
if autoRandom, typeString := autoRandomType(field); autoRandom {
return typeString
}

constraint := func(sqlType string) string {
if field.DataType == schema.Uint {
sqlType += " unsigned"
Expand Down