Documentation
¶
Overview ¶
Package def parses column and index definitions used across sqlx.
structs.FieldsFor attaches a ColumnDef to each model field; [builder] and dialects consume it for DDL. The genx model generator uses ParseKeyDef to turn `@model pk|idx|uidx=...` annotations into KeyDefine values.
ColumnDef ¶
d := def.ParseColDef(t, `db:"name,width=128,default='',null"`)
ParseColDef reads the `db` struct tag options into ColumnDef:
- null / autoinc / unsigned
- width / precision
- default (raw string, including quotes or SQL functions)
- onupdate
- deprecated (optional rename target for migrations)
DefineFromCatalog / DefineFromUser / DefineFromGoType record where a definition originated when filled later by catalog scan or dialect.
KeyDefine ¶
ParseKeyDef parses `@model` index annotation values. See that function's comment and ExampleParseKeyDef for annotation → parse mappings.
pk=<field>[;<field>...] idx=<name[,method]>;<field[,options...]>[;...] uidx=<name[,method]>;<field[,options...]>[;...]
Fields are separated by `;`, options by `,`. KeyColumnOption holds a field (or column) name plus per-column options such as NULLS,FIRST. Helpers: ResolveIndexNameAndUsing, ResolveKeyColumnOptions, KeyColumnOptionByNames.
Index ¶
Examples ¶
Constants ¶
const ( // DefineFromCatalog scan from database DefineFromCatalog = 1 // DefineFromUser type implements builder.ColDef interface DefineFromUser = 2 // DefineFromGoType parse depends on Go type DefineFromGoType = 3 )
Variables ¶
This section is empty.
Functions ¶
Types ¶
type ColumnDef ¶
type ColumnDef struct {
Type typx.Type
Tag reflect.StructTag
DataType string
IsUnsigned *bool
Width *uint64
Precision *uint64
Default *string
OnUpdate *string
Null bool
AutoInc bool
Comment string
Desc []string
Relation []string
Deprecated *DeprecatedActions
DefineFrom int
}
ColumnDef describes source and database model
func (*ColumnDef) ParseDBTag ¶
type ColumnDef2 ¶ added in v0.3.1
type ColumnDef2 struct {
Type typx.Type
Tag reflect.StructTag
DataType string
IsUnsigned bool
NumericPrecision *uint64
NumericScale *uint64
DatetimePrecision *uint64
TextLength *uint64
AutoInc bool
Nullable bool
DefaultValue *string
OnUpdate *string
Comment string
Desc []string
Relation []string
Deprecated *DeprecatedActions
}
type DeprecatedActions ¶
type DeprecatedActions struct {
RenameTo string `name:"rename"`
}
type KeyColumnOption ¶
func KeyColumnOptionByNames ¶
func KeyColumnOptionByNames(names ...string) []KeyColumnOption
func ResolveKeyColumnOptions ¶
func ResolveKeyColumnOptions(s string) KeyColumnOption
func ResolveKeyColumnOptionsFromStrings ¶
func ResolveKeyColumnOptionsFromStrings(ss ...string) (options []KeyColumnOption)
func (*KeyColumnOption) String ¶
func (o *KeyColumnOption) String() string
type KeyDefine ¶
type KeyDefine struct {
Kind KeyKind
Name string
Using string
Comment string
Options []KeyColumnOption
}
func ParseKeyDef ¶
ParseKeyDef parses an `@model` primary-key or index annotation value.
k is the annotation key: "pk", "idx", or "uidx". def is the annotation value after `=`.
Separators: fields use `;`; name/method and field options use `,`.
Annotation → ParseKeyDef(k, def):
// @model pk=ID
ParseKeyDef("pk", "ID")
// Kind=PRIMARY Name=primary Options=[{ID}]
// @model idx=i_status;Status
ParseKeyDef("idx", "i_status;Status")
// Kind=INDEX Name=i_status Options=[{Status}]
// @model idx=ui_username,BTREE;Username
ParseKeyDef("idx", "ui_username,BTREE;Username")
// Kind=INDEX Name=ui_username Using=BTREE Options=[{Username}]
// @model idx=i_status;Status,NULLS,FIRST
ParseKeyDef("idx", "i_status;Status,NULLS,FIRST")
// Kind=INDEX Name=i_status Options=[{Status [NULLS FIRST]}]
// @model uidx=ui_product_id;ProductID;DeletedAt
ParseKeyDef("uidx", "ui_product_id;ProductID;DeletedAt")
// Kind=UNIQUE Name=ui_product_id Options=[{ProductID} {DeletedAt}]
// @model uidx=ui_name;f_org_id,NULLS,FIRST;MemberID
ParseKeyDef("uidx", "ui_name;f_org_id,NULLS,FIRST;MemberID")
// Kind=UNIQUE Name=ui_name Options=[{f_org_id [NULLS FIRST]} {MemberID}]
Tabular form of def:
| Kind | Name[,Using] | Field[,Option]... | | :--- | :--- | :---- | | idx | idx_name,BTREE | Name | | uidx | idx_name | OrgID;f_member_id,NULLS,FIRST | | pk | (forced "primary") | ID |
Example ¶
// // @model pk=ID
kd := def.ParseKeyDef("pk", "ID")
fmt.Printf("pk name=%s fields=%v\n", kd.Name, kd.OptionsNames())
// // @model idx=ui_username,BTREE;Username
kd = def.ParseKeyDef("idx", "ui_username,BTREE;Username")
fmt.Printf("idx name=%s using=%s fields=%v\n", kd.Name, kd.Using, kd.OptionsNames())
// // @model idx=i_status;Status,NULLS,FIRST
kd = def.ParseKeyDef("idx", "i_status;Status,NULLS,FIRST")
fmt.Printf("idx fields=%v\n", kd.OptionsStrings())
// // @model uidx=ui_product_id;ProductID;DeletedAt
kd = def.ParseKeyDef("uidx", "ui_product_id;ProductID;DeletedAt")
fmt.Printf("uidx name=%s fields=%v\n", kd.Name, kd.OptionsNames())
Output: pk name=primary fields=[ID] idx name=ui_username using=BTREE fields=[Username] idx fields=[Status,NULLS,FIRST] uidx name=ui_product_id fields=[ProductID DeletedAt]
Source Files