Documentation
¶
Overview ¶
Package gconv implements powerful and convenient converting functionality for any types of variables.
This package should keep much less dependencies with other packages.
Index ¶
- Variables
- func Bool(any interface{}) bool
- func Byte(any interface{}) byte
- func Bytes(any interface{}) []byte
- func Convert(fromValue interface{}, toTypeName string, extraParams ...interface{}) interface{}
- func Duration(any interface{}) time.Duration
- func Float32(any interface{}) float32
- func Float32s(any interface{}) []float32
- func Float64(any interface{}) float64
- func Float64s(any interface{}) []float64
- func Floats(any interface{}) []float64
- func GTime(any interface{}, format ...string) *gtime.Time
- func Int(any interface{}) int
- func Int16(any interface{}) int16
- func Int32(any interface{}) int32
- func Int32s(any interface{}) []int32
- func Int64(any interface{}) int64
- func Int64s(any interface{}) []int64
- func Int8(any interface{}) int8
- func Interfaces(any interface{}) []interface{}
- func Ints(any interface{}) []int
- func Map(value interface{}, tags ...string) map[string]interface{}
- func MapDeep(value interface{}, tags ...string) map[string]interface{}
- func MapStrStr(value interface{}, tags ...string) map[string]string
- func MapStrStrDeep(value interface{}, tags ...string) map[string]string
- func MapToMap(params interface{}, pointer interface{}, mapping ...map[string]string) error
- func MapToMaps(params interface{}, pointer interface{}, mapping ...map[string]string) error
- func Maps(value interface{}, tags ...string) []map[string]interface{}
- func MapsDeep(value interface{}, tags ...string) []map[string]interface{}
- func Rune(any interface{}) rune
- func Runes(any interface{}) []rune
- func Scan(params interface{}, pointer interface{}, mapping ...map[string]string) (err error)
- func ScanList(structSlice interface{}, structSlicePointer interface{}, bindToAttrName string, ...) (err error)
- func SliceAny(any interface{}) []interface{}
- func SliceFloat(any interface{}) []float64
- func SliceFloat32(any interface{}) []float32
- func SliceFloat64(any interface{}) []float64
- func SliceInt(any interface{}) []int
- func SliceInt32(any interface{}) []int32
- func SliceInt64(any interface{}) []int64
- func SliceMap(any interface{}) []map[string]interface{}
- func SliceMapDeep(any interface{}) []map[string]interface{}
- func SliceStr(any interface{}) []string
- func SliceStruct(params interface{}, pointer interface{}, mapping ...map[string]string) (err error)
- func SliceUint(any interface{}) []uint
- func SliceUint32(any interface{}) []uint32
- func SliceUint64(any interface{}) []uint64
- func String(any interface{}) string
- func Strings(any interface{}) []string
- func Struct(params interface{}, pointer interface{}, mapping ...map[string]string) (err error)
- func StructTag(params interface{}, pointer interface{}, priorityTag string) (err error)
- func Structs(params interface{}, pointer interface{}, mapping ...map[string]string) (err error)
- func StructsTag(params interface{}, pointer interface{}, priorityTag string) (err error)
- func Time(any interface{}, format ...string) time.Time
- func Uint(any interface{}) uint
- func Uint16(any interface{}) uint16
- func Uint32(any interface{}) uint32
- func Uint32s(any interface{}) []uint32
- func Uint64(any interface{}) uint64
- func Uint64s(any interface{}) []uint64
- func Uint8(any interface{}) uint8
- func Uints(any interface{}) []uint
- func UnsafeBytesToStr(b []byte) string
- func UnsafeStrToBytes(s string) []byte
Constants ¶
This section is empty.
Variables ¶
var ( // StructTagPriority defines the default priority tags for Map*/Struct* functions. // Note, the "gconv", "param", "params" tags are used by old version of package. // It is strongly recommended using short tag "c" or "p" instead in the future. StructTagPriority = []string{"gconv", "param", "params", "c", "p", "json"} )
Functions ¶
func Bool ¶
func Bool(any interface{}) bool
Bool converts `any` to bool. It returns false if `any` is: false, "", 0, "false", "off", "no", empty slice/map.
func Convert ¶
func Convert(fromValue interface{}, toTypeName string, extraParams ...interface{}) interface{}
Convert converts the variable `fromValue` to the type `toTypeName`, the type `toTypeName` is specified by string. The optional parameter `extraParams` is used for additional necessary parameter for this conversion. It supports common types conversion as its conversion based on type name string.
func Duration ¶
Duration converts `any` to time.Duration. If `any` is string, then it uses time.ParseDuration to convert it. If `any` is numeric, then it converts `any` as nanoseconds.
func GTime ¶
GTime converts `any` to *gtime.Time. The parameter `format` can be used to specify the format of `any`. If no `format` given, it converts `any` using gtime.NewFromTimeStamp if `any` is numeric, or using gtime.StrToTime if `any` is string.
func Interfaces ¶
func Interfaces(any interface{}) []interface{}
Interfaces converts `any` to []interface{}.
func Map ¶
Map converts any variable `value` to map[string]interface{}. If the parameter `value` is not a map/struct/*struct type, then the conversion will fail and returns nil.
If `value` is a struct/*struct object, the second parameter `tags` specifies the most priority tags that will be detected, otherwise it detects the tags in order of: gconv, json, field name.
func MapDeep ¶
MapDeep does Map function recursively, which means if the attribute of `value` is also a struct/*struct, calls Map function on this attribute converting it to a map[string]interface{} type variable. Also see Map.
func MapStrStr ¶
MapStrStr converts `value` to map[string]string. Note that there might be data copy for this map type converting.
func MapStrStrDeep ¶
MapStrStrDeep converts `value` to map[string]string recursively. Note that there might be data copy for this map type converting.
func MapToMap ¶
MapToMap converts any map type variable `params` to another map type variable `pointer` using reflect. See doMapToMap.
func MapToMaps ¶
MapToMaps converts any slice type variable `params` to another map slice type variable `pointer`. See doMapToMaps.
func Maps ¶
Maps converts `value` to []map[string]interface{}. Note that it automatically checks and converts json string to []map if `value` is string/[]byte.
func MapsDeep ¶
MapsDeep converts `value` to []map[string]interface{} recursively.
TODO completely implement the recursive converting for all types.
func Scan ¶
Scan automatically checks the type of `pointer` and converts `params` to `pointer`. It supports `pointer` with type of `*map/*[]map/*[]*map/*struct/**struct/*[]struct/*[]*struct` for converting.
It calls function `doMapToMap` internally if `pointer` is type of *map for converting. It calls function `doMapToMaps` internally if `pointer` is type of *[]map/*[]*map for converting. It calls function `doStruct` internally if `pointer` is type of *struct/**struct for converting. It calls function `doStructs` internally if `pointer` is type of *[]struct/*[]*struct for converting.
func ScanList ¶
func ScanList(structSlice interface{}, structSlicePointer interface{}, bindToAttrName string, relationAttrNameAndFields ...string) (err error)
ScanList converts `structSlice` to struct slice which contains other complex struct attributes. Note that the parameter `structSlicePointer` should be type of *[]struct/*[]*struct.
Usage example 1: Normal attribute struct relation:
type EntityUser struct {
Uid int
Name string
}
type EntityUserDetail struct {
Uid int
Address string
}
type EntityUserScores struct {
Id int
Uid int
Score int
Course string
}
type Entity struct {
User *EntityUser
UserDetail *EntityUserDetail
UserScores []*EntityUserScores
}
var users []*Entity ScanList(records, &users, "User") ScanList(records, &users, "User", "uid") ScanList(records, &users, "UserDetail", "User", "uid:Uid") ScanList(records, &users, "UserScores", "User", "uid:Uid") ScanList(records, &users, "UserScores", "User", "uid")
Usage example 2: Embedded attribute struct relation:
type EntityUser struct {
Uid int
Name string
}
type EntityUserDetail struct {
Uid int
Address string
}
type EntityUserScores struct {
Id int
Uid int
Score int
}
type Entity struct {
EntityUser
UserDetail EntityUserDetail
UserScores []EntityUserScores
}
var users []*Entity ScanList(records, &users) ScanList(records, &users, "UserDetail", "uid") ScanList(records, &users, "UserScores", "uid")
The parameters "User/UserDetail/UserScores" in the example codes specify the target attribute struct that current result will be bound to.
The "uid" in the example codes is the table field name of the result, and the "Uid" is the relational struct attribute name - not the attribute name of the bound to target. In the example codes, it's attribute name "Uid" of "User" of entity "Entity". It automatically calculates the HasOne/HasMany relationship with given `relation` parameter.
See the example or unit testing cases for clear understanding for this function.
func SliceMapDeep ¶
func SliceMapDeep(any interface{}) []map[string]interface{}
SliceMapDeep is alias of MapsDeep.
func SliceStruct ¶
SliceStruct is alias of Structs.
func String ¶
func String(any interface{}) string
String converts `any` to string. It's most commonly used converting function.
func Struct ¶
Struct maps the params key-value pairs to the corresponding struct object's attributes. The third parameter `mapping` is unnecessary, indicating the mapping rules between the custom key name and the attribute name(case-sensitive).
Note:
- The `params` can be any type of map/struct, usually a map.
- The `pointer` should be type of *struct/**struct, which is a pointer to struct object or struct pointer.
- Only the public attributes of struct object can be mapped.
- If `params` is a map, the key of the map `params` can be lowercase. It will automatically convert the first letter of the key to uppercase in mapping procedure to do the matching. It ignores the map key, if it does not match.
func StructTag ¶
StructTag acts as Struct but also with support for priority tag feature, which retrieves the specified tags for `params` key-value items to struct attribute names mapping. The parameter `priorityTag` supports multiple tags that can be joined with char ','.
func StructsTag ¶
StructsTag acts as Structs but also with support for priority tag feature, which retrieves the specified tags for `params` key-value items to struct attribute names mapping. The parameter `priorityTag` supports multiple tags that can be joined with char ','.
func UnsafeBytesToStr ¶
UnsafeBytesToStr converts []byte to string without memory copy. Note that, if you completely sure you will never use `b` variable in the feature, you can use this unsafe function to implement type conversion in high performance.
func UnsafeStrToBytes ¶
UnsafeStrToBytes converts string to []byte without memory copy. Note that, if you completely sure you will never use `s` variable in the feature, you can use this unsafe function to implement type conversion in high performance.
Types ¶
This section is empty.
Source Files
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- gconv.go
- gconv_float.go
- gconv_int.go
- gconv_interface.go
- gconv_map.go
- gconv_maps.go
- gconv_maptomap.go
- gconv_maptomaps.go
- gconv_scan.go
- gconv_slice_any.go
- gconv_slice_float.go
- gconv_slice_int.go
- gconv_slice_str.go
- gconv_slice_uint.go
- gconv_struct.go
- gconv_structs.go
- gconv_time.go
- gconv_uint.go
- gconv_unsafe.go