mirror of https://github.com/go-gorm/gorm.git
564 lines
17 KiB
Go
564 lines
17 KiB
Go
package schema
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import (
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"database/sql"
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"database/sql/driver"
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"fmt"
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"reflect"
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"strconv"
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"sync"
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"time"
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"github.com/jinzhu/now"
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)
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type DataType string
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const (
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Bool DataType = "bool"
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Int = "int"
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Uint = "uint"
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Float = "float"
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String = "string"
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Time = "time"
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Bytes = "bytes"
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)
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type Field struct {
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Name string
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DBName string
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BindNames []string
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DataType DataType
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DBDataType string
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PrimaryKey bool
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AutoIncrement bool
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Creatable bool
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Updatable bool
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HasDefaultValue bool
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DefaultValue string
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NotNull bool
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Unique bool
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Comment string
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Size int
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Precision int
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FieldType reflect.Type
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IndirectFieldType reflect.Type
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StructField reflect.StructField
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Tag reflect.StructTag
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TagSettings map[string]string
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Schema *Schema
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EmbeddedSchema *Schema
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ReflectValuer func(reflect.Value) reflect.Value
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Valuer func(reflect.Value) interface{}
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Setter func(reflect.Value, interface{}) error
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}
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func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
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field := &Field{
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Name: fieldStruct.Name,
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BindNames: []string{fieldStruct.Name},
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FieldType: fieldStruct.Type,
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IndirectFieldType: fieldStruct.Type,
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StructField: fieldStruct,
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Creatable: true,
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Updatable: true,
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Tag: fieldStruct.Tag,
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TagSettings: ParseTagSetting(fieldStruct.Tag),
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Schema: schema,
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}
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for field.IndirectFieldType.Kind() == reflect.Ptr {
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field.IndirectFieldType = field.IndirectFieldType.Elem()
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}
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fieldValue := reflect.New(field.IndirectFieldType)
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// if field is valuer, used its value or first fields as data type
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if valuer, isValuer := fieldValue.Interface().(driver.Valuer); isValuer {
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var overrideFieldValue bool
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if v, err := valuer.Value(); v != nil && err == nil {
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overrideFieldValue = true
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fieldValue = reflect.ValueOf(v)
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}
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if field.IndirectFieldType.Kind() == reflect.Struct {
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for i := 0; i < field.IndirectFieldType.NumField(); i++ {
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if !overrideFieldValue {
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newFieldType := field.IndirectFieldType.Field(i).Type
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for newFieldType.Kind() == reflect.Ptr {
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newFieldType = newFieldType.Elem()
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}
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fieldValue = reflect.New(newFieldType)
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overrideFieldValue = true
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}
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// copy tag settings from valuer
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for key, value := range ParseTagSetting(field.IndirectFieldType.Field(i).Tag) {
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if _, ok := field.TagSettings[key]; !ok {
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field.TagSettings[key] = value
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}
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}
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}
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}
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}
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// setup permission
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if _, ok := field.TagSettings["-"]; ok {
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field.Creatable = false
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field.Updatable = false
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}
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if dbName, ok := field.TagSettings["COLUMN"]; ok {
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field.DBName = dbName
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}
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if val, ok := field.TagSettings["PRIMARYKEY"]; ok && checkTruth(val) {
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field.PrimaryKey = true
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}
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if val, ok := field.TagSettings["AUTOINCREMENT"]; ok && checkTruth(val) {
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field.AutoIncrement = true
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field.HasDefaultValue = true
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}
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if v, ok := field.TagSettings["DEFAULT"]; ok {
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field.HasDefaultValue = true
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field.DefaultValue = v
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}
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if num, ok := field.TagSettings["SIZE"]; ok {
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field.Size, _ = strconv.Atoi(num)
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}
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if p, ok := field.TagSettings["PRECISION"]; ok {
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field.Precision, _ = strconv.Atoi(p)
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}
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if val, ok := field.TagSettings["NOT NULL"]; ok && checkTruth(val) {
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field.NotNull = true
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}
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if val, ok := field.TagSettings["UNIQUE"]; ok && checkTruth(val) {
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field.Unique = true
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}
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if val, ok := field.TagSettings["COMMENT"]; ok {
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field.Comment = val
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}
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if val, ok := field.TagSettings["TYPE"]; ok {
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field.DBDataType = val
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}
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switch fieldValue.Elem().Kind() {
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case reflect.Bool:
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field.DataType = Bool
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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field.DataType = Int
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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field.DataType = Uint
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case reflect.Float32, reflect.Float64:
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field.DataType = Float
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case reflect.String:
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field.DataType = String
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case reflect.Struct:
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if _, ok := fieldValue.Interface().(*time.Time); ok {
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field.DataType = Time
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} else if fieldValue.Type().ConvertibleTo(reflect.TypeOf(&time.Time{})) {
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field.DataType = Time
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}
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case reflect.Array, reflect.Slice:
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if fieldValue.Type().Elem() == reflect.TypeOf(uint8(0)) {
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field.DataType = Bytes
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}
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}
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if field.Size == 0 {
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switch fieldValue.Kind() {
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case reflect.Int, reflect.Int64, reflect.Uint, reflect.Uint64, reflect.Float64:
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field.Size = 64
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case reflect.Int8, reflect.Uint8:
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field.Size = 8
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case reflect.Int16, reflect.Uint16:
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field.Size = 16
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case reflect.Int32, reflect.Uint32, reflect.Float32:
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field.Size = 32
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}
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}
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if _, ok := field.TagSettings["EMBEDDED"]; ok || fieldStruct.Anonymous {
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var err error
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field.Creatable = false
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field.Updatable = false
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if field.EmbeddedSchema, err = Parse(fieldValue.Interface(), &sync.Map{}, schema.namer); err != nil {
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schema.err = err
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}
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for _, ef := range field.EmbeddedSchema.Fields {
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ef.Schema = schema
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ef.BindNames = append([]string{fieldStruct.Name}, ef.BindNames...)
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// index is negative means is pointer
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if field.FieldType.Kind() == reflect.Struct {
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ef.StructField.Index = append([]int{fieldStruct.Index[0]}, ef.StructField.Index...)
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} else {
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ef.StructField.Index = append([]int{-fieldStruct.Index[0] - 1}, ef.StructField.Index...)
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}
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if prefix, ok := field.TagSettings["EMBEDDEDPREFIX"]; ok {
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ef.DBName = prefix + ef.DBName
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}
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for k, v := range field.TagSettings {
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ef.TagSettings[k] = v
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}
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}
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}
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return field
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}
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// ValueOf field value of
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func (field *Field) ValueOf(value reflect.Value) interface{} {
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if field != nil {
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return field.Valuer(value)
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}
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return nil
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}
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func (field *Field) Set(value reflect.Value, v interface{}) error {
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if field != nil {
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return field.Setter(value, v)
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}
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return fmt.Errorf("failed to set field value: %v", field.Name)
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}
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// create valuer, setter when parse struct
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func (field *Field) setupValuerAndSetter() {
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// Valuer
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switch {
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case len(field.StructField.Index) == 1:
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field.Valuer = func(value reflect.Value) interface{} {
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return reflect.Indirect(value).Field(field.StructField.Index[0]).Interface()
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}
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case len(field.StructField.Index) == 2 && field.StructField.Index[0] >= 0:
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field.Valuer = func(value reflect.Value) interface{} {
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return reflect.Indirect(value).Field(field.StructField.Index[0]).Field(field.StructField.Index[1]).Interface()
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}
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default:
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field.Valuer = func(value reflect.Value) interface{} {
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v := reflect.Indirect(value)
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for _, idx := range field.StructField.Index {
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if idx >= 0 {
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v = v.Field(idx)
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} else {
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v = v.Field(-idx - 1)
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if v.Type().Elem().Kind() == reflect.Struct {
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if !v.IsNil() {
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v = v.Elem()
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}
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} else {
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return nil
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}
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}
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}
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return v.Interface()
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}
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}
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// ReflectValuer
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switch {
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case len(field.StructField.Index) == 1:
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if field.FieldType.Kind() == reflect.Ptr {
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field.ReflectValuer = func(value reflect.Value) reflect.Value {
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fieldValue := reflect.Indirect(value).Field(field.StructField.Index[0])
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if fieldValue.IsNil() {
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fieldValue.Set(reflect.New(field.FieldType.Elem()))
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}
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return fieldValue
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}
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} else {
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field.ReflectValuer = func(value reflect.Value) reflect.Value {
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return reflect.Indirect(value).Field(field.StructField.Index[0])
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}
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}
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case len(field.StructField.Index) == 2 && field.StructField.Index[0] >= 0 && field.FieldType.Kind() != reflect.Ptr:
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field.ReflectValuer = func(value reflect.Value) reflect.Value {
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return reflect.Indirect(value).Field(field.StructField.Index[0]).Field(field.StructField.Index[1])
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}
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default:
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field.ReflectValuer = func(value reflect.Value) reflect.Value {
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v := reflect.Indirect(value)
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for _, idx := range field.StructField.Index {
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if idx >= 0 {
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v = v.Field(idx)
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} else {
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v = v.Field(-idx - 1)
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}
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if v.Kind() == reflect.Ptr {
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if v.Type().Elem().Kind() == reflect.Struct {
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if v.IsNil() {
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v.Set(reflect.New(v.Type().Elem()))
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}
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}
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if idx < len(field.StructField.Index)-1 {
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v = v.Elem()
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}
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}
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}
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return v
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}
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}
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recoverFunc := func(value reflect.Value, v interface{}, setter func(reflect.Value, interface{}) error) (err error) {
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reflectV := reflect.ValueOf(v)
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if reflectV.Type().ConvertibleTo(field.FieldType) {
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field.ReflectValuer(value).Set(reflectV.Convert(field.FieldType))
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} else if valuer, ok := v.(driver.Valuer); ok {
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if v, err = valuer.Value(); err == nil {
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return setter(value, v)
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}
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} else if field.FieldType.Kind() == reflect.Ptr && reflectV.Type().ConvertibleTo(field.FieldType.Elem()) {
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field.ReflectValuer(value).Elem().Set(reflectV.Convert(field.FieldType.Elem()))
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} else if reflectV.Kind() == reflect.Ptr {
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return field.Setter(value, reflectV.Elem().Interface())
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} else {
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return fmt.Errorf("failed to set value %+v to field %v", v, field.Name)
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}
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return err
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}
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// Setter
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switch field.FieldType.Kind() {
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case reflect.Bool:
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field.Setter = func(value reflect.Value, v interface{}) error {
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switch data := v.(type) {
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case bool:
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field.ReflectValuer(value).SetBool(data)
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case *bool:
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field.ReflectValuer(value).SetBool(*data)
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default:
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return recoverFunc(value, v, field.Setter)
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}
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return nil
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}
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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field.Setter = func(value reflect.Value, v interface{}) (err error) {
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switch data := v.(type) {
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case int64:
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field.ReflectValuer(value).SetInt(data)
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case int:
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field.ReflectValuer(value).SetInt(int64(data))
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case int8:
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field.ReflectValuer(value).SetInt(int64(data))
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case int16:
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field.ReflectValuer(value).SetInt(int64(data))
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case int32:
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field.ReflectValuer(value).SetInt(int64(data))
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case uint:
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field.ReflectValuer(value).SetInt(int64(data))
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case uint8:
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field.ReflectValuer(value).SetInt(int64(data))
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case uint16:
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field.ReflectValuer(value).SetInt(int64(data))
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case uint32:
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field.ReflectValuer(value).SetInt(int64(data))
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case uint64:
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field.ReflectValuer(value).SetInt(int64(data))
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case float32:
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field.ReflectValuer(value).SetInt(int64(data))
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case float64:
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field.ReflectValuer(value).SetInt(int64(data))
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case []byte:
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return field.Setter(value, string(data))
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case string:
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if i, err := strconv.ParseInt(data, 0, 64); err == nil {
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field.ReflectValuer(value).SetInt(i)
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} else {
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return err
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}
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default:
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return recoverFunc(value, v, field.Setter)
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}
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return err
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}
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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field.Setter = func(value reflect.Value, v interface{}) (err error) {
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switch data := v.(type) {
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case uint64:
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field.ReflectValuer(value).SetUint(data)
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case uint:
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field.ReflectValuer(value).SetUint(uint64(data))
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case uint8:
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field.ReflectValuer(value).SetUint(uint64(data))
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case uint16:
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field.ReflectValuer(value).SetUint(uint64(data))
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case uint32:
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field.ReflectValuer(value).SetUint(uint64(data))
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case int64:
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field.ReflectValuer(value).SetUint(uint64(data))
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case int:
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field.ReflectValuer(value).SetUint(uint64(data))
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case int8:
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field.ReflectValuer(value).SetUint(uint64(data))
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case int16:
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field.ReflectValuer(value).SetUint(uint64(data))
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case int32:
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field.ReflectValuer(value).SetUint(uint64(data))
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case float32:
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field.ReflectValuer(value).SetUint(uint64(data))
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case float64:
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field.ReflectValuer(value).SetUint(uint64(data))
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case []byte:
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return field.Setter(value, string(data))
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case string:
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if i, err := strconv.ParseUint(data, 0, 64); err == nil {
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field.ReflectValuer(value).SetUint(i)
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} else {
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return err
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}
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default:
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return recoverFunc(value, v, field.Setter)
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}
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return err
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}
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case reflect.Float32, reflect.Float64:
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field.Setter = func(value reflect.Value, v interface{}) (err error) {
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switch data := v.(type) {
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case float64:
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field.ReflectValuer(value).SetFloat(data)
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case float32:
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field.ReflectValuer(value).SetFloat(float64(data))
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case int64:
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field.ReflectValuer(value).SetFloat(float64(data))
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case int:
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field.ReflectValuer(value).SetFloat(float64(data))
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case int8:
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field.ReflectValuer(value).SetFloat(float64(data))
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case int16:
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field.ReflectValuer(value).SetFloat(float64(data))
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case int32:
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field.ReflectValuer(value).SetFloat(float64(data))
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case uint:
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field.ReflectValuer(value).SetFloat(float64(data))
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case uint8:
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field.ReflectValuer(value).SetFloat(float64(data))
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case uint16:
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field.ReflectValuer(value).SetFloat(float64(data))
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case uint32:
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field.ReflectValuer(value).SetFloat(float64(data))
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case uint64:
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field.ReflectValuer(value).SetFloat(float64(data))
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case []byte:
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return field.Setter(value, string(data))
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case string:
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if i, err := strconv.ParseFloat(data, 64); err == nil {
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field.ReflectValuer(value).SetFloat(i)
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} else {
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return err
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}
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default:
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return recoverFunc(value, v, field.Setter)
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}
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return err
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}
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case reflect.String:
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field.Setter = func(value reflect.Value, v interface{}) (err error) {
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switch data := v.(type) {
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case string:
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field.ReflectValuer(value).SetString(data)
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case []byte:
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field.ReflectValuer(value).SetString(string(data))
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case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
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field.ReflectValuer(value).SetString(fmt.Sprint(data))
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case float64, float32:
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field.ReflectValuer(value).SetString(fmt.Sprintf("%."+strconv.Itoa(field.Precision)+"f", data))
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default:
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return recoverFunc(value, v, field.Setter)
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}
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return err
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}
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default:
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fieldValue := reflect.New(field.FieldType)
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switch fieldValue.Elem().Interface().(type) {
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case time.Time:
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field.Setter = func(value reflect.Value, v interface{}) error {
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switch data := v.(type) {
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case time.Time:
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field.ReflectValuer(value).Set(reflect.ValueOf(v))
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case *time.Time:
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field.ReflectValuer(value).Set(reflect.ValueOf(v).Elem())
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case string:
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if t, err := now.Parse(data); err == nil {
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field.ReflectValuer(value).Set(reflect.ValueOf(t))
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} else {
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return fmt.Errorf("failed to set string %v to time.Time field %v, failed to parse it as time, got error %v", v, field.Name, err)
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}
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default:
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return recoverFunc(value, v, field.Setter)
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}
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return nil
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}
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case *time.Time:
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field.Setter = func(value reflect.Value, v interface{}) error {
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switch data := v.(type) {
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case time.Time:
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field.ReflectValuer(value).Elem().Set(reflect.ValueOf(v))
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case *time.Time:
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field.ReflectValuer(value).Set(reflect.ValueOf(v))
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case string:
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if t, err := now.Parse(data); err == nil {
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field.ReflectValuer(value).Elem().Set(reflect.ValueOf(t))
|
|
} else {
|
|
return fmt.Errorf("failed to set string %v to time.Time field %v, failed to parse it as time, got error %v", v, field.Name, err)
|
|
}
|
|
default:
|
|
return recoverFunc(value, v, field.Setter)
|
|
}
|
|
return nil
|
|
}
|
|
default:
|
|
if _, ok := fieldValue.Interface().(sql.Scanner); ok {
|
|
// struct scanner
|
|
field.Setter = func(value reflect.Value, v interface{}) (err error) {
|
|
reflectV := reflect.ValueOf(v)
|
|
if reflectV.Type().ConvertibleTo(field.FieldType) {
|
|
field.ReflectValuer(value).Set(reflectV.Convert(field.FieldType))
|
|
} else if valuer, ok := v.(driver.Valuer); ok {
|
|
if v, err = valuer.Value(); err == nil {
|
|
err = field.ReflectValuer(value).Addr().Interface().(sql.Scanner).Scan(v)
|
|
}
|
|
} else {
|
|
err = field.ReflectValuer(value).Addr().Interface().(sql.Scanner).Scan(v)
|
|
}
|
|
return
|
|
}
|
|
} else if _, ok := fieldValue.Elem().Interface().(sql.Scanner); ok {
|
|
// pointer scanner
|
|
field.Setter = func(value reflect.Value, v interface{}) (err error) {
|
|
reflectV := reflect.ValueOf(v)
|
|
if reflectV.Type().ConvertibleTo(field.FieldType) {
|
|
field.ReflectValuer(value).Set(reflectV.Convert(field.FieldType))
|
|
} else if reflectV.Type().ConvertibleTo(field.FieldType.Elem()) {
|
|
field.ReflectValuer(value).Elem().Set(reflectV.Convert(field.FieldType.Elem()))
|
|
} else if valuer, ok := v.(driver.Valuer); ok {
|
|
if v, err = valuer.Value(); err == nil {
|
|
err = field.ReflectValuer(value).Interface().(sql.Scanner).Scan(v)
|
|
}
|
|
} else {
|
|
err = field.ReflectValuer(value).Interface().(sql.Scanner).Scan(v)
|
|
}
|
|
return
|
|
}
|
|
} else {
|
|
field.Setter = func(value reflect.Value, v interface{}) (err error) {
|
|
return recoverFunc(value, v, field.Setter)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|