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array.go
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array.go
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package pgdialect
import (
"database/sql"
"fmt"
"reflect"
"github.com/pandoratoolbox/bun/schema"
)
type ArrayValue struct {
v reflect.Value
append schema.AppenderFunc
scan schema.ScannerFunc
}
// Array accepts a slice and returns a wrapper for working with PostgreSQL
// array data type.
//
// For struct fields you can use array tag:
//
// Emails []string `bun:",array"`
func Array(vi interface{}) *ArrayValue {
v := reflect.ValueOf(vi)
if !v.IsValid() {
panic(fmt.Errorf("bun: Array(nil)"))
}
return &ArrayValue{
v: v,
append: pgDialect.arrayAppender(v.Type()),
scan: arrayScanner(v.Type()),
}
}
var (
_ schema.QueryAppender = (*ArrayValue)(nil)
_ sql.Scanner = (*ArrayValue)(nil)
)
func (a *ArrayValue) AppendQuery(fmter schema.Formatter, b []byte) ([]byte, error) {
if a.append == nil {
panic(fmt.Errorf("bun: Array(unsupported %s)", a.v.Type()))
}
return a.append(fmter, b, a.v), nil
}
func (a *ArrayValue) Scan(src interface{}) error {
if a.scan == nil {
return fmt.Errorf("bun: Array(unsupported %s)", a.v.Type())
}
if a.v.Kind() != reflect.Ptr {
return fmt.Errorf("bun: Array(non-pointer %s)", a.v.Type())
}
return a.scan(a.v, src)
}
func (a *ArrayValue) Value() interface{} {
if a.v.IsValid() {
return a.v.Interface()
}
return nil
}