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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package driver
import (
"fmt"
"reflect"
"strconv"
)
// ValueConverter is the interface providing the ConvertValue method.
type ValueConverter interface {
// ConvertValue converts a value to a restricted subset type.
ConvertValue(v interface{}) (interface{}, error)
}
// Bool is a ValueConverter that converts input values to bools.
//
// The conversion rules are:
// - .... TODO(bradfitz): TBD
var Bool boolType
type boolType struct{}
var _ ValueConverter = boolType{}
func (boolType) ConvertValue(v interface{}) (interface{}, error) {
return nil, fmt.Errorf("TODO(bradfitz): bool conversions")
}
// Int32 is a ValueConverter that converts input values to int64,
// respecting the limits of an int32 value.
var Int32 int32Type
type int32Type struct{}
var _ ValueConverter = int32Type{}
func (int32Type) ConvertValue(v interface{}) (interface{}, error) {
rv := reflect.ValueOf(v)
switch rv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
i64 := rv.Int()
if i64 > (1<<31)-1 || i64 < -(1<<31) {
return nil, fmt.Errorf("sql/driver: value %d overflows int32", v)
}
return i64, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
u64 := rv.Uint()
if u64 > (1<<31)-1 {
return nil, fmt.Errorf("sql/driver: value %d overflows int32", v)
}
return int64(u64), nil
case reflect.String:
i, err := strconv.Atoi(rv.String())
if err != nil {
return nil, fmt.Errorf("sql/driver: value %q can't be converted to int32", v)
}
return int64(i), nil
}
return nil, fmt.Errorf("sql/driver: unsupported value %v (type %T) converting to int32", v, v)
}
// String is a ValueConverter that converts its input to a string.
// If the value is already a string or []byte, it's unchanged.
// If the value is of another type, conversion to string is done
// with fmt.Sprintf("%v", v).
var String stringType
type stringType struct{}
func (stringType) ConvertValue(v interface{}) (interface{}, error) {
switch v.(type) {
case string, []byte:
return v, nil
}
return fmt.Sprintf("%v", v), nil
}
// IsParameterSubsetType reports whether v is of a valid type for a
// parameter. These types are:
//
// int64
// float64
// bool
// nil
// []byte
// string
//
// This is the ame list as IsScanSubsetType, with the addition of
// string.
func IsParameterSubsetType(v interface{}) bool {
if IsScanSubsetType(v) {
return true
}
if _, ok := v.(string); ok {
return true
}
return false
}
// IsScanSubsetType reports whether v is of a valid type for a
// value populated by Rows.Next. These types are:
//
// int64
// float64
// bool
// nil
// []byte
//
// This is the same list as IsParameterSubsetType, without string.
func IsScanSubsetType(v interface{}) bool {
if v == nil {
return true
}
switch v.(type) {
case int64, float64, []byte, bool:
return true
}
return false
}
// DefaultParameterConverter is the default implementation of
// ValueConverter that's used when a Stmt doesn't implement
// ColumnConverter.
//
// DefaultParameterConverter returns the given value directly if
// IsSubsetType(value). Otherwise integer type are converted to
// int64, floats to float64, and strings to []byte. Other types are
// an error.
var DefaultParameterConverter defaultConverter
type defaultConverter struct{}
var _ ValueConverter = defaultConverter{}
func (defaultConverter) ConvertValue(v interface{}) (interface{}, error) {
if IsParameterSubsetType(v) {
return v, nil
}
rv := reflect.ValueOf(v)
switch rv.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return rv.Int(), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
return int64(rv.Uint()), nil
case reflect.Uint64:
u64 := rv.Uint()
if u64 >= 1<<63 {
return nil, fmt.Errorf("uint64 values with high bit set are not supported")
}
return int64(u64), nil
case reflect.Float32, reflect.Float64:
return rv.Float(), nil
}
return nil, fmt.Errorf("unsupported type %s", rv.Kind())
}
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