orm

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Published: Dec 22, 2017 License: BSD-2-Clause Imports: 20 Imported by: 0

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Index

Constants

View Source
const (
	PrimaryKeyFlag = uint8(1) << iota
	ForeignKeyFlag
	NotNullFlag
	UniqueFlag
	ArrayFlag
)
View Source
const (
	AfterQueryHookFlag = uint8(1) << iota
	AfterSelectHookFlag
	BeforeInsertHookFlag
	AfterInsertHookFlag
	BeforeUpdateHookFlag
	AfterUpdateHookFlag
	BeforeDeleteHookFlag
	AfterDeleteHookFlag
)
View Source
const (
	HasOneRelation = 1 << iota
	BelongsToRelation
	HasManyRelation
	Many2ManyRelation
)

Variables

View Source
var Tables = newTables()

Functions

func Delete

func Delete(db DB, model interface{}) error

func Insert

func Insert(db DB, v ...interface{}) error

func Pagination

func Pagination(values url.Values) func(*Query) (*Query, error)

Pagination is used with Query.Apply to set LIMIT and OFFSET from the URL values:

  • ?limit=10 - sets q.Limit(10), max limit is 1000.
  • ?page=5 - sets q.Offset((page - 1) * limit), max offset is 1000000.

func Q

func Q(query string, params ...interface{}) queryParamsAppender

func Scan

func Scan(values ...interface{}) valuesModel

func Select

func Select(db DB, model interface{}) error

func SetTableNameInflector

func SetTableNameInflector(fn func(string) string)

SetTableNameInflector overrides the default func that pluralizes model name to get table name, e.g. my_article becomes my_articles.

func URLFilters

func URLFilters(urlValues url.Values) func(*Query) (*Query, error)

URLFilters is used with Query.Apply to add WHERE clauses from the URL values:

  • ?foo=bar - Where(`"foo" = 'bar'`)
  • ?foo=hello&foo=world - Where(`"foo" IN ('hello','world')`)
  • ?foo__exclude=bar - Where(`"foo" != 'bar'`)
  • ?foo__ieq=bar - Where(`"foo" ILIKE 'bar'`)
  • ?foo__match=bar - Where(`"foo" SIMILAR TO 'bar'`)
  • ?foo__gt=42 - Where(`"foo" > 42`)
  • ?foo__gte=42 - Where(`"foo" >= 42`)
  • ?foo__lt=42 - Where(`"foo" < 42`)
  • ?foo__lte=42 - Where(`"foo" <= 42`)

func Update

func Update(db DB, model ...interface{}) error

Types

type ColumnScanner

type ColumnScanner interface {
	// Scan assigns a column value from a row.
	//
	// An error should be returned if the value can not be stored
	// without loss of information.
	ScanColumn(colIdx int, colName string, b []byte) error
}

ColumnScanner is used to scan column values.

type CreateTableOptions

type CreateTableOptions struct {
	Temp          bool
	IfNotExists   bool
	Varchar       int  // replaces PostgreSQL data type `text` with `varchar(n)`
	FKConstraints bool // whether to create foreign key constraints
}

type DB

type DB interface {
	Model(model ...interface{}) *Query
	Select(model interface{}) error
	Insert(model ...interface{}) error
	Update(model ...interface{}) error
	Delete(model interface{}) error

	Exec(query interface{}, params ...interface{}) (Result, error)
	ExecOne(query interface{}, params ...interface{}) (Result, error)
	Query(coll, query interface{}, params ...interface{}) (Result, error)
	QueryOne(model, query interface{}, params ...interface{}) (Result, error)

	CopyFrom(r io.Reader, query interface{}, params ...interface{}) (Result, error)
	CopyTo(w io.Writer, query interface{}, params ...interface{}) (Result, error)

	Context() context.Context
	QueryFormatter
}

DB is a common interface for pg.DB and pg.Tx types.

type Discard

type Discard struct {
	// contains filtered or unexported fields
}

func (Discard) AddModel

func (Discard) AddModel(_ ColumnScanner) error

func (Discard) AfterDelete

func (Discard) AfterDelete(_ DB) error

func (Discard) AfterInsert

func (Discard) AfterInsert(_ DB) error

func (Discard) AfterQuery

func (Discard) AfterQuery(_ DB) error

func (Discard) AfterSelect

func (Discard) AfterSelect(_ DB) error

func (Discard) AfterUpdate

func (Discard) AfterUpdate(_ DB) error

func (Discard) BeforeDelete

func (Discard) BeforeDelete(_ DB) error

func (Discard) BeforeInsert

func (Discard) BeforeInsert(_ DB) error

func (Discard) BeforeUpdate

func (Discard) BeforeUpdate(_ DB) error

func (Discard) Init

func (Discard) Init() error

func (Discard) NewModel

func (d Discard) NewModel() ColumnScanner

func (Discard) ScanColumn

func (Discard) ScanColumn(colIdx int, colName string, b []byte) error

type DropTableOptions

type DropTableOptions struct {
	IfExists bool
	Cascade  bool
}

type Field

type Field struct {
	Type reflect.Type

	GoName  string  // struct field name, e.g. Id
	SQLName string  // SQL name, .e.g. id
	Column  types.Q // escaped SQL name, e.g. "id"
	SQLType string
	Index   []int
	Default types.Q
	// contains filtered or unexported fields
}

func (*Field) AppendValue

func (f *Field) AppendValue(b []byte, strct reflect.Value, quote int) []byte

func (*Field) Copy

func (f *Field) Copy() *Field

func (*Field) HasFlag

func (f *Field) HasFlag(flag uint8) bool

func (*Field) IsZero

func (f *Field) IsZero(strct reflect.Value) bool

func (*Field) OmitZero

func (f *Field) OmitZero(strct reflect.Value) bool

func (*Field) ScanValue

func (f *Field) ScanValue(strct reflect.Value, b []byte) error

func (*Field) SetFlag

func (f *Field) SetFlag(flag uint8)

func (*Field) Value

func (f *Field) Value(strct reflect.Value) reflect.Value

type FormatAppender

type FormatAppender interface {
	AppendFormat([]byte, QueryFormatter) []byte
}

type Formatter

type Formatter struct {
	// contains filtered or unexported fields
}

func (Formatter) Append

func (f Formatter) Append(dst []byte, src string, params ...interface{}) []byte

func (Formatter) AppendBytes

func (f Formatter) AppendBytes(dst, src []byte, params ...interface{}) []byte

func (Formatter) FormatQuery

func (f Formatter) FormatQuery(dst []byte, query string, params ...interface{}) []byte

func (*Formatter) SetParam

func (f *Formatter) SetParam(param string, value interface{})

func (Formatter) String

func (f Formatter) String() string

func (*Formatter) WithParam

func (f *Formatter) WithParam(param string, value interface{}) Formatter

type Method

type Method struct {
	Index int
	// contains filtered or unexported fields
}

func (*Method) AppendValue

func (m *Method) AppendValue(dst []byte, strct reflect.Value, quote int) []byte

func (*Method) Has

func (m *Method) Has(flag int8) bool

func (*Method) Value

func (m *Method) Value(strct reflect.Value) reflect.Value

type Model

type Model interface {
	ColumnScanner

	Init() error

	// NewModel returns ColumnScanner that is used to scan columns
	// from the current row.
	NewModel() ColumnScanner

	// AddModel adds ColumnScanner to the Collection.
	AddModel(ColumnScanner) error

	AfterQuery(DB) error
	AfterSelect(DB) error

	BeforeInsert(DB) error
	AfterInsert(DB) error

	BeforeUpdate(DB) error
	AfterUpdate(DB) error

	BeforeDelete(DB) error
	AfterDelete(DB) error
}

func NewModel

func NewModel(values ...interface{}) (Model, error)

type Pager

type Pager struct {
	Limit  int
	Offset int

	// Default max limit is 1000.
	MaxLimit int
	// Default max offset is 1000000.
	MaxOffset int
	// contains filtered or unexported fields
}

func NewPager

func NewPager(values url.Values) *Pager

func (*Pager) GetLimit

func (p *Pager) GetLimit() int

func (*Pager) GetOffset

func (p *Pager) GetOffset() int

func (*Pager) GetPage

func (p *Pager) GetPage() int

func (*Pager) Paginate

func (p *Pager) Paginate(q *Query) (*Query, error)

func (*Pager) SetPage

func (p *Pager) SetPage(page int)

func (*Pager) SetURLValues

func (p *Pager) SetURLValues(values url.Values)

type Query

type Query struct {
	// contains filtered or unexported fields
}

func NewQuery

func NewQuery(db DB, model ...interface{}) *Query

func (*Query) AppendQuery

func (q *Query) AppendQuery(b []byte) ([]byte, error)

func (*Query) Apply

func (q *Query) Apply(fn func(*Query) (*Query, error)) *Query

Apply calls the fn passing the Query as an argument.

func (*Query) Column

func (q *Query) Column(columns ...string) *Query

Column adds column to the Query quoting it according to PostgreSQL rules. ColumnExpr can be used to bypass quoting restriction.

func (*Query) ColumnExpr

func (q *Query) ColumnExpr(expr string, params ...interface{}) *Query

ColumnExpr adds column expression to the Query.

func (*Query) Copy

func (q *Query) Copy() *Query

Copy returns copy of the Query.

func (*Query) CopyFrom

func (q *Query) CopyFrom(r io.Reader, query interface{}, params ...interface{}) (Result, error)

CopyFrom is an alias from DB.CopyFrom.

func (*Query) CopyTo

func (q *Query) CopyTo(w io.Writer, query interface{}, params ...interface{}) (Result, error)

CopyTo is an alias from DB.CopyTo.

func (*Query) Count

func (q *Query) Count() (int, error)

Count returns number of rows matching the query using count aggregate function.

func (*Query) CountEstimate

func (q *Query) CountEstimate(threshold int) (int, error)

CountEstimate uses EXPLAIN to get estimated number of rows matching the query. If that number is bigger than the threshold it returns the estimation. Otherwise it executes another query using count aggregate function and returns the result.

Based on https://wiki.postgresql.org/wiki/Count_estimate

func (*Query) CreateTable

func (q *Query) CreateTable(opt *CreateTableOptions) (Result, error)

func (*Query) DB

func (q *Query) DB(db DB) *Query

func (*Query) Delete

func (q *Query) Delete(values ...interface{}) (Result, error)

Delete deletes the model.

func (*Query) DropTable

func (q *Query) DropTable(opt *DropTableOptions) (Result, error)

func (*Query) Exec

func (q *Query) Exec(query interface{}, params ...interface{}) (Result, error)

Exec is an alias for DB.Exec.

func (*Query) ExecOne

func (q *Query) ExecOne(query interface{}, params ...interface{}) (Result, error)

ExecOne is an alias for DB.ExecOne.

func (*Query) First

func (q *Query) First() error

First sorts rows by primary key and selects the first row. It is a shortcut for:

q.OrderExpr("id ASC").Limit(1)

func (*Query) For

func (q *Query) For(s string, params ...interface{}) *Query

func (*Query) FormatQuery

func (q *Query) FormatQuery(b []byte, query string, params ...interface{}) []byte

func (*Query) Group

func (q *Query) Group(columns ...string) *Query

func (*Query) GroupExpr

func (q *Query) GroupExpr(group string, params ...interface{}) *Query

func (*Query) Having

func (q *Query) Having(having string, params ...interface{}) *Query

func (*Query) Insert

func (q *Query) Insert(values ...interface{}) (Result, error)

Insert inserts the model.

func (*Query) Join

func (q *Query) Join(join string, params ...interface{}) *Query

func (*Query) Last

func (q *Query) Last() error

Last sorts rows by primary key and selects the last row. It is a shortcut for:

q.OrderExpr("id DESC").Limit(1)

func (*Query) Limit

func (q *Query) Limit(n int) *Query

func (*Query) Model

func (q *Query) Model(model ...interface{}) *Query

func (*Query) New

func (q *Query) New() *Query

New returns new zero Query binded to the current db and model.

func (*Query) Offset

func (q *Query) Offset(n int) *Query

func (*Query) OnConflict

func (q *Query) OnConflict(s string, params ...interface{}) *Query

func (*Query) Order

func (q *Query) Order(orders ...string) *Query

Order adds sort order to the Query quoting column name. OrderExpr can be used to bypass quoting restriction.

func (*Query) OrderExpr

func (q *Query) OrderExpr(order string, params ...interface{}) *Query

Order adds sort order to the Query.

func (*Query) Query

func (q *Query) Query(model, query interface{}, params ...interface{}) (Result, error)

Query is an alias for DB.Query.

func (*Query) QueryOne

func (q *Query) QueryOne(model, query interface{}, params ...interface{}) (Result, error)

QueryOne is an alias for DB.QueryOne.

func (*Query) Relation

func (q *Query) Relation(name string, apply func(*Query) (*Query, error)) *Query

func (*Query) Returning

func (q *Query) Returning(s string, params ...interface{}) *Query

func (*Query) Select

func (q *Query) Select(values ...interface{}) error

Select selects the model.

func (*Query) SelectAndCount

func (q *Query) SelectAndCount(values ...interface{}) (count int, err error)

SelectAndCount runs Select and Count in two goroutines, waits for them to finish and returns the result.

func (*Query) SelectAndCountEstimate

func (q *Query) SelectAndCountEstimate(threshold int, values ...interface{}) (count int, err error)

SelectAndCountEstimate runs Select and CountEstimate in two goroutines, waits for them to finish and returns the result.

func (*Query) SelectOrInsert

func (q *Query) SelectOrInsert(values ...interface{}) (inserted bool, err error)

SelectOrInsert selects the model inserting one if it does not exist.

func (*Query) Set

func (q *Query) Set(set string, params ...interface{}) *Query

func (*Query) Table

func (q *Query) Table(tables ...string) *Query

func (*Query) TableExpr

func (q *Query) TableExpr(expr string, params ...interface{}) *Query

func (*Query) Update

func (q *Query) Update(scan ...interface{}) (Result, error)

Update updates the model.

func (*Query) UpdateNotNull

func (q *Query) UpdateNotNull(scan ...interface{}) (Result, error)

Update updates the model omitting null columns.

func (*Query) Where

func (q *Query) Where(where string, params ...interface{}) *Query

func (*Query) WhereGroup

func (q *Query) WhereGroup(fn func(*Query) (*Query, error)) *Query

WhereGroup encloses conditions added in the function in parentheses.

q.Where("TRUE").
	WhereGroup(func(q *orm.Query) (*orm.Query, error)) {
		q = q.WhereOr("FALSE").WhereOr("TRUE").
		return q, nil
	})

generates

WHERE TRUE AND (FALSE OR TRUE)

func (*Query) WhereIn

func (q *Query) WhereIn(where string, values ...interface{}) *Query

WhereIn is a shortcut for Where and pg.In to work with IN operator:

WhereIn("id IN (?)", 1, 2, 3)

func (*Query) WhereOr

func (q *Query) WhereOr(where string, params ...interface{}) *Query

func (*Query) WhereOrGroup

func (q *Query) WhereOrGroup(fn func(*Query) (*Query, error)) *Query

WhereOrGroup encloses conditions added in the function in parentheses.

q.Where("TRUE").
	WhereOrGroup(func(q *orm.Query) (*orm.Query, error)) {
		q = q.Where("FALSE").Where("TRUE").
		return q, nil
	})

generates

WHERE TRUE OR (FALSE AND TRUE)

func (*Query) WherePK

func (q *Query) WherePK() *Query

func (*Query) With

func (q *Query) With(name string, subq *Query) *Query

With adds subq as common table expression with the given name.

func (*Query) WrapWith

func (q *Query) WrapWith(name string) *Query

WrapWith creates new Query and adds to it current query as common table expression with the given name.

type QueryAppender

type QueryAppender interface {
	Copy() QueryAppender
	Query() *Query
	AppendQuery(dst []byte) ([]byte, error)
}

type QueryFormatter

type QueryFormatter interface {
	FormatQuery(b []byte, query string, params ...interface{}) []byte
}

type Relation

type Relation struct {
	Type        int
	Polymorphic bool
	Field       *Field
	JoinTable   *Table
	FKs         []*Field

	M2MTableName  types.Q
	M2MTableAlias types.Q
	BasePrefix    string
	JoinPrefix    string
}

type Result

type Result interface {
	Model() Model

	// RowsAffected returns the number of rows affected by SELECT, INSERT, UPDATE,
	// or DELETE queries. It returns -1 if query can't possibly affect any rows,
	// e.g. in case of CREATE or SHOW queries.
	RowsAffected() int

	// RowsReturned returns the number of rows returned by the query.
	RowsReturned() int
}

A Result summarizes an executed SQL command.

func CreateTable

func CreateTable(db DB, model interface{}, opt *CreateTableOptions) (Result, error)

func DropTable

func DropTable(db DB, model interface{}, opt *DropTableOptions) (Result, error)

type Table

type Table struct {
	Type reflect.Type

	TypeName  string
	Name      types.Q
	Alias     types.Q
	ModelName string

	Fields     []*Field // PKs + DataFields
	PKs        []*Field
	DataFields []*Field
	FieldsMap  map[string]*Field

	Methods   map[string]*Method
	Relations map[string]*Relation
	// contains filtered or unexported fields
}

func (*Table) AddField

func (t *Table) AddField(field *Field)

func (*Table) AppendParam

func (t *Table) AppendParam(b []byte, strct reflect.Value, name string) ([]byte, bool)

func (*Table) GetField

func (t *Table) GetField(fieldName string) (*Field, error)

func (*Table) HasField

func (t *Table) HasField(field string) bool

func (*Table) HasFlag

func (t *Table) HasFlag(flag uint8) bool

func (*Table) RemoveField

func (t *Table) RemoveField(field *Field)

func (*Table) SetFlag

func (t *Table) SetFlag(flag uint8)

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