kallax

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 Go to latest Published: Feb 16, 2017 License: MIT Imports: 14 Imported by: 0

README

Kallax - PostgreSQL ORM for Go

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Installation

The recommended way to install kallax is:

go get -u github.com/src-d/kallax/...

kallax includes a binary tool used by go generate, please be sure that $GOPATH/bin is on your $PATH

Running tests

For obvious reasons, an instance of PostgreSQL is required to run the tests of this package.

By default, it assumes that an instance exists at 0.0.0.0:5432 with an user, password and database name all equal to testing.

If that is not the case you can set the following environment variables:

  • DBNAME: name of the database
  • DBUSER: database user
  • DBPASS: database user password

License

MIT, see LICENSE

Documentation

Overview

Kallax is a PostgreSQL typesafe ORM for the Go language.

Kallax aims to provide a way of programmatically write queries and interact with a PostgreSQL database without having to write a single line of SQL, use strings to refer to columns and use values of any type in queries. For that reason, the first priority of kallax is to provide type safety to the data access layer. Another of the goals of kallax is make sure all models are, first and foremost, Go structs without having to use database-specific types such as, for example, `sql.NullInt64. Support for arrays of all basic Go types and all JSON and arrays operators is provided as well.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrNonNewDocument non-new documents cannot be inserted
	ErrNonNewDocument = errors.New("kallax: cannot insert a non new document")
	// ErrNewDocument a new documents cannot be updated
	ErrNewDocument = errors.New("kallax: cannot updated a new document")
	// ErrEmptyID a document without ID cannot be used with Save method
	ErrEmptyID = errors.New("kallax: a record without id is not allowed")
	// ErrNoRowUpdate is returned when an update operation does not affect any
	// rows, meaning the model being updated does not exist.
	ErrNoRowUpdate = errors.New("kallax: update affected no rows")
	// ErrNotWritable is returned when a record is not writable.
	ErrNotWritable = errors.New("kallax: record is not writable")
	// ErrStop can be returned inside a ForEach callback to stop iteration.
	ErrStop = errors.New("kallax: stopped ForEach execution")
	// ErrInvalidTxCallback is returned when a nil callback is passed.
	ErrInvalidTxCallback = errors.New("kallax: invalid transaction callback given")
	// ErrNotFound is returned when a certain entity is not found.
	ErrNotFound = errors.New("kallax: entity not found")
	// ErrCantSetID is returned when a model is inserted and it does not have
	// neither an autoincrement primary key nor implements the IDSetter
	// interface.
	ErrCantSetID = errors.New("kallax: model does not have an auto incrementable primary key, it needs to implement IDSetter interface")
)
View Source 
var (
	// ErrManyToManyNotSupported is returned when a many to many relationship
	// is added to a query.
	ErrManyToManyNotSupported = errors.New("kallax: many to many relationships are not supported")
)
View Source 
var ErrRawScan = errors.New("kallax: result set comes from raw query, use RawScan instead")

ErrRawScan is an error returned when a the `Scan` method of `ResultSet` is called with a `ResultSet` created as a result of a `RawQuery`, which is not allowed.

View Source 
var ErrRawScanBatching = errors.New("kallax: cannot perform a raw scan on a batching result set")

ErrRawScanBatching is an error returned when the `RawScan` method is used with a batching result set.

Functions

func ApplyAfterEvents added in v0.13.0 

func ApplyAfterEvents(r Record, wasPersisted bool) error

ApplyAfterEvents calls all the update, insert or save after events of the record. Save events are always called after the insert or update event.

func ApplyBeforeEvents added in v0.13.0 

func ApplyBeforeEvents(r Record) error

ApplyBeforeEvents calls all the update, insert or save before events of the record. Save events are always called before the insert or update event.

func ColumnNames 

func ColumnNames(columns []SchemaField) []string

ColumnNames returns the names of the given schema fields.

func RecordValues 

func RecordValues(record Valuer, columns ...string) ([]interface{}, error)

RecordValues returns the values of a record at the given columns in the same order as the columns.

func VirtualColumn added in v0.12.0 

func VirtualColumn(col string, r Record, id Identifier) sql.Scanner

VirtualColumn returns a sql.Scanner that will scan the given column as a virtual column in the given record.

Types

type AfterDeleter added in v0.13.0 

type AfterDeleter interface {
	// AfterDelete will do some operations after being deleted. If an error is
	// returned, it will cause the delete to be rolled back.
	AfterDelete() error
}

AfterDeleter will do some operations after being deleted.

type AfterInserter added in v0.13.0 

type AfterInserter interface {
	// AfterInsert will do some operations after being inserted. If an error is
	// returned, it will cause the insert to be rolled back.
	AfterInsert() error
}

AfterInserter will do some operations after being inserted.

type AfterSaver added in v0.13.0 

type AfterSaver interface {
	// AfterSave will do some operations after being inserted or updated. If an
	// error is returned, it will cause the insert or update to be rolled back.
	AfterSave() error
}

AfterSaver will do some operations after being inserted or updated.

type AfterUpdater added in v0.13.0 

type AfterUpdater interface {
	// AfterUpdate will do some operations after being updated. If an error is
	// returned, it will cause the update to be rolled back.
	AfterUpdate() error
}

AfterUpdater will do some operations after being updated.

type ArraySchemaField added in v0.13.0 

type ArraySchemaField interface {
	SchemaField
	// contains filtered or unexported methods
}

ArraySchemaField is an interface that defines if a field is a JSON array.

type BaseQuery 

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

BaseQuery is a generic query builder to build queries programmatically.

func NewBaseQuery 

func NewBaseQuery(schema Schema) *BaseQuery

NewBaseQuery creates a new BaseQuery for querying the table of the given schema.

func (*BaseQuery) AddRelation 

func (q *BaseQuery) AddRelation(schema Schema, field string, typ RelationshipType, filter Condition) error

AddRelation adds a relationship if the given to the query, which is present in the given field of the query base schema. A condition to filter can also be passed in the case of one to many relationships.

func (*BaseQuery) BatchSize 

func (q *BaseQuery) BatchSize(size uint64)

BatchSize sets the batch size.

func (*BaseQuery) Copy 

func (q *BaseQuery) Copy() *BaseQuery

Copy returns an identical copy of the query. BaseQuery is mutable, that is why this method is provided.

func (*BaseQuery) GetBatchSize 

func (q *BaseQuery) GetBatchSize() uint64

GetBatchSize returns the number of rows retrieved per batch while retrieving 1:N relationships.

func (*BaseQuery) GetLimit 

func (q *BaseQuery) GetLimit() uint64

GetLimit returns the max number of rows to retrieve.

func (*BaseQuery) GetOffset 

func (q *BaseQuery) GetOffset() uint64

GetOffset returns the number of rows to skip.

func (*BaseQuery) Limit 

func (q *BaseQuery) Limit(n uint64)

Limit sets the max number of rows to retrieve.

func (*BaseQuery) Offset 

func (q *BaseQuery) Offset(n uint64)

Offset sets the number of rows to skip.

func (*BaseQuery) Order 

func (q *BaseQuery) Order(cols ...ColumnOrder)

Order adds the given order clauses to the list of columns to order the results by.

func (*BaseQuery) Schema added in v0.12.0 

func (q *BaseQuery) Schema() Schema

Schema returns the Schema of the query.

func (*BaseQuery) Select 

func (q *BaseQuery) Select(columns ...SchemaField)

Select adds the given columns to the list of selected columns in the query.

func (*BaseQuery) SelectNot 

func (q *BaseQuery) SelectNot(columns ...SchemaField)

SelectNot adds the given columns to the list of excluded columns in the query.

func (*BaseQuery) String 

func (q *BaseQuery) String() string

String returns the SQL generated by the query. If the query is malformed, it will return an empty string, as errors compiling the SQL are ignored.

func (*BaseQuery) Where 

func (q *BaseQuery) Where(cond Condition)

Where adds a new condition to filter the query. All conditions added are concatenated with "and". 

q.Where(Eq(NameColumn, "foo"))
q.Where(Gt(AgeColumn, 18))
// ... WHERE name = "foo" AND age > 18

type BaseResultSet added in v0.12.0 

type BaseResultSet struct {
	*sql.Rows
	// contains filtered or unexported fields
}

BaseResultSet is a generic collection of rows.

func NewResultSet 

func NewResultSet(rows *sql.Rows, readOnly bool, relationships []Relationship, columns ...string) *BaseResultSet

NewResultSet creates a new result set with the given rows and columns. It is mandatory that all column names are in the same order and are exactly equal to the ones in the query that produced the rows.

func (*BaseResultSet) Get added in v0.12.0 

func (rs *BaseResultSet) Get(schema Schema) (Record, error)

Get returns the next record in the schema.

func (*BaseResultSet) RawScan added in v0.12.0 

func (rs *BaseResultSet) RawScan(dest ...interface{}) error

RowScan copies the columns in the current row into the values pointed at by dest. The number of values in dest must be the same as the number of columns selected in the query.

func (*BaseResultSet) Scan added in v0.12.0 

func (rs *BaseResultSet) Scan(record Record) error

Scan fills the column fields of the given value with the current row.

type BaseSchema 

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

BaseSchema is the basic implementation of Schema.

func NewBaseSchema 

func NewBaseSchema(table, alias string, id SchemaField, fks ForeignKeys, ctor RecordConstructor, autoIncr bool, columns ...SchemaField) *BaseSchema

NewBaseSchema creates a new schema with the given table, alias, identifier and columns.

func (*BaseSchema) Alias 

func (s *BaseSchema) Alias() string

func (*BaseSchema) Columns 

func (s *BaseSchema) Columns() []SchemaField

func (*BaseSchema) ForeignKey 

func (s *BaseSchema) ForeignKey(field string) (*ForeignKey, bool)

func (*BaseSchema) ID 

func (s *BaseSchema) ID() SchemaField

func (*BaseSchema) New added in v0.12.0 

func (s *BaseSchema) New() Record

func (*BaseSchema) Table 

func (s *BaseSchema) Table() string

func (*BaseSchema) WithAlias 

func (s *BaseSchema) WithAlias(field string) Schema

type BaseSchemaField 

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

BaseSchemaField is a basic schema field with name.

func (*BaseSchemaField) QualifiedName 

func (f *BaseSchemaField) QualifiedName(schema Schema) string

func (BaseSchemaField) String 

func (f BaseSchemaField) String() string

type BatchingResultSet added in v0.12.0 

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

BatchingResultSet is a result set that retrieves all the items up to the batch size set in the query. If there are 1:N relationships, it collects all the identifiers of those records, retrieves all the rows matching them in the table of the the N end, and assigns them to their correspondent to the record they belong to. It will continue doing this process until no more rows are returned by the query. This minimizes the number of queries and operations to perform in order to retrieve a set of results and their relationships.

func NewBatchingResultSet added in v0.12.0 

func NewBatchingResultSet(runner *batchQueryRunner) *BatchingResultSet

NewBatchingResultSet returns a new result set that performs batching underneath.

func (*BatchingResultSet) Close added in v0.12.0 

func (rs *BatchingResultSet) Close() error

Close will do nothing, as the internal result sets used by this are closed when the rows at fetched. It will never throw an error.

func (*BatchingResultSet) Get added in v0.12.0 

func (rs *BatchingResultSet) Get(_ Schema) (Record, error)

Get returns the next processed record and the last error occurred. Even though it accepts a schema, it is ignored, as the result set is already aware of it. This is here just to be able to imeplement the ResultSet interface.

func (*BatchingResultSet) Next added in v0.12.0 

func (rs *BatchingResultSet) Next() bool

Next advances the internal index of the fetched records in one. If there are no fetched records, will fetch the next batch. It will return false when there are no more rows.

func (*BatchingResultSet) RawScan added in v0.12.0 

func (rs *BatchingResultSet) RawScan(_ ...interface{}) error

RawScan will always throw an error, as this is not a supported operation of a batching result set.

type BeforeDeleter added in v0.13.0 

type BeforeDeleter interface {
	// BeforeDelete will do some operations before being deleted. If an error is
	// returned, it will prevent the delete from happening.
	BeforeDelete() error
}

BeforeDeleter will do some operations before being deleted.

type BeforeInserter added in v0.13.0 

type BeforeInserter interface {
	// BeforeInsert will do some operations before being inserted. If an error is
	// returned, it will prevent the insert from happening.
	BeforeInsert() error
}

BeforeInserter will do some operations before being inserted.

type BeforeSaver added in v0.13.0 

type BeforeSaver interface {
	// BeforeSave will do some operations before being updated or inserted. If an
	// error is returned, it will prevent the update or insert from happening.
	BeforeSave() error
}

BeforeSaver will do some operations before being updated or inserted.

type BeforeUpdater added in v0.13.0 

type BeforeUpdater interface {
	// BeforeUpdate will do some operations before being updated. If an error is
	// returned, it will prevent the update from happening.
	BeforeUpdate() error
}

BeforeUpdater will do some operations before being updated.

type ColumnAddresser 

type ColumnAddresser interface {
	// ColumnAddress returns the pointer to the column value of the given
	// column name, or an error if it does not exist in the model.
	ColumnAddress(string) (interface{}, error)
}

ColumnAddresser provides the pointer addresses of columns.

type ColumnOrder 

type ColumnOrder interface {
	// ToSql returns the SQL representation of the column with its order.
	ToSql(Schema) string
	// contains filtered or unexported methods
}

ColumnOrder represents a column name with its order.

func Asc 

func Asc(col SchemaField) ColumnOrder

Asc returns a column ordered by ascending order.

func Desc 

func Desc(col SchemaField) ColumnOrder

Desc returns a column ordered by descending order.

type Condition 

type Condition func(Schema) squirrel.Sqlizer

Condition represents a condition of filtering in a query.

func And 

func And(conds ...Condition) Condition

And returns the given conditions joined by logical ands.

func ArrayContainedBy added in v0.12.0 

func ArrayContainedBy(col SchemaField, values ...interface{}) Condition

ArrayContainedBy returns a condition that will be true when `col` has all its elements present in the given values.

func ArrayContains added in v0.12.0 

func ArrayContains(col SchemaField, values ...interface{}) Condition

ArrayContains returns a condition that will be true when `col` contains all the given values.

func ArrayEq added in v0.12.0 

func ArrayEq(col SchemaField, values ...interface{}) Condition

ArrayEq returns a condition that will be true when `col` is equal to an array with the given elements.

func ArrayGt added in v0.12.0 

func ArrayGt(col SchemaField, values ...interface{}) Condition

ArrayGt returns a condition that will be true when all elements in `col` are greater or equal than their counterparts in the given values, and one of the elements at least is greater than its counterpart in the given values. For example: for a col with values [1,2,3] and values [1,2,2], it will be true.

func ArrayGtOrEq added in v0.12.0 

func ArrayGtOrEq(col SchemaField, values ...interface{}) Condition

ArrayGtOrEq returns a condition that will be true when all elements in `col` are greater or equal than their counterparts in the given values. For example: for a col with values [1,2,2] and values [1,2,2], it will be true.

func ArrayLt added in v0.12.0 

func ArrayLt(col SchemaField, values ...interface{}) Condition

ArrayLt returns a condition that will be true when all elements in `col` are lower or equal than their counterparts in the given values, and one of the elements at least is lower than its counterpart in the given values. For example: for a col with values [1,2,2] and values [1,2,3], it will be true.

func ArrayLtOrEq added in v0.12.0 

func ArrayLtOrEq(col SchemaField, values ...interface{}) Condition

ArrayLtOrEq returns a condition that will be true when all elements in `col` are lower or equal than their counterparts in the given values. For example: for a col with values [1,2,2] and values [1,2,2], it will be true.

func ArrayNotEq added in v0.12.0 

func ArrayNotEq(col SchemaField, values ...interface{}) Condition

ArrayNotEq returns a condition that will be true when `col` is not equal to an array with the given elements.

func ArrayOverlap added in v0.12.0 

func ArrayOverlap(col SchemaField, values ...interface{}) Condition

ArrayOverlap returns a condition that will be true when `col` has elements in common with an array formed by the given values.

func Eq 

func Eq(col SchemaField, value interface{}) Condition

Eq returns a condition that will be true when `col` is equal to `value`.

func Gt 

func Gt(col SchemaField, n interface{}) Condition

Gt returns a condition that will be true when `col` is greater than `value`.

func GtOrEq 

func GtOrEq(col SchemaField, n interface{}) Condition

GtOrEq returns a condition that will be true when `col` is greater than `value` or equal.

func In 

func In(col SchemaField, values ...interface{}) Condition

In returns a condition that will be true when `col` is equal to any of the passed `values`.

func JSONContainedBy added in v0.13.0 

func JSONContainedBy(col SchemaField, elem interface{}) Condition

JSONContainedBy returns a condition that will be true when `col` is contained by the given element converted to JSON.

func JSONContains added in v0.13.0 

func JSONContains(col SchemaField, elem interface{}) Condition

JSONContains returns a condition that will be true when `col` contains the given element converted to JSON.

func JSONContainsAllKeys added in v0.13.0 

func JSONContainsAllKeys(col SchemaField, keys ...string) Condition

JSONContainsAllKeys returns a condition that will be true when `col` contains all the given keys. Will also match elements if the column is an array.

func JSONContainsAny added in v0.13.0 

func JSONContainsAny(col SchemaField, elems ...interface{}) Condition

JSONContainsAny returns a condition that will be true when `col` contains any of the given elements converted to json. Giving no elements will cause an error to be returned when the condition is evaluated.

func JSONContainsAnyKey added in v0.13.0 

func JSONContainsAnyKey(col SchemaField, keys ...string) Condition

JSONContainsAnyKey returns a condition that will be true when `col` contains any of the given keys. Will also match elements if the column is an array.

func JSONIsArray added in v0.13.0 

func JSONIsArray(col SchemaField) Condition

JSONIsArray returns a condition that will be true when `col` is a JSON array.

func JSONIsObject added in v0.13.0 

func JSONIsObject(col SchemaField) Condition

JSONIsObject returns a condition that will be true when `col` is a JSON object.

func Lt 

func Lt(col SchemaField, value interface{}) Condition

Lt returns a condition that will be true when `col` is lower than `value`.

func LtOrEq 

func LtOrEq(col SchemaField, n interface{}) Condition

LtOrEq returns a condition that will be true when `col` is lower than `value` or equal.

func Neq 

func Neq(col SchemaField, n interface{}) Condition

Neq returns a condition that will be true when `col` is not `value`.

func Not 

func Not(cond Condition) Condition

Not returns the given condition negated.

func NotIn 

func NotIn(col SchemaField, values ...interface{}) Condition

NotIn returns a condition that will be true when `col` is distinct to all of the passed `values`.

func Or 

func Or(conds ...Condition) Condition

Or returns the given conditions joined by logical ors.

type ForeignKey added in v0.12.0 

type ForeignKey struct {
	*BaseSchemaField
	Inverse bool
}

ForeignKey contains the schema field of the foreign key and if it is an inverse foreign key or not.

func NewForeignKey added in v0.12.0 

func NewForeignKey(name string, inverse bool) *ForeignKey

NewForeignKey creates a new Foreign key with the given name.

type ForeignKeys 

type ForeignKeys map[string]*ForeignKey

ForeignKeys is a mapping between relationships and their foreign key field.

type Identifiable 

type Identifiable interface {
	// GetID returns the ID.
	GetID() Identifier
}

Identifiable must be implemented by those values that can be identified by an ID.

type Identifier added in v0.13.0 

type Identifier interface {
	sql.Scanner
	driver.Valuer
	// Equals reports whether the identifier and the given one are equal.
	Equals(Identifier) bool
	// IsEmpty returns whether the ID is empty or not.
	IsEmpty() bool
	// Raw returns the internal value of the identifier.
	Raw() interface{}
}

Identifier is a type used to identify a model.

type JSONKeyType added in v0.13.0 

type JSONKeyType string

JSONKeyType is the type of an object key in a JSON. 

const (
	// JSONAny represents a type that can't be casted.
	JSONAny JSONKeyType = ""
	// JSONText is a text json type.
	JSONText JSONKeyType = "text"
	// JSONInt is a numeric json type.
	JSONInt JSONKeyType = "bigint"
	// JSONFloat is a floating point json type.
	JSONFloat JSONKeyType = "decimal"
	// JSONBool is a boolean json type.
	JSONBool JSONKeyType = "bool"
)

type JSONSchemaArray added in v0.13.0 

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

JSONSchemaArray is a SchemaField that represents a JSON array.

func NewJSONSchemaArray added in v0.13.0 

func NewJSONSchemaArray(field string, paths ...string) *JSONSchemaArray

NewJSONSchemaArray creates a new SchemaField that is a json array.

func (*JSONSchemaArray) QualifiedName added in v0.13.0 

func (f *JSONSchemaArray) QualifiedName(schema Schema) string

func (*JSONSchemaArray) String added in v0.13.0 

func (f *JSONSchemaArray) String() string

type JSONSchemaKey added in v0.13.0 

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

JSONSchemaKey is a SchemaField that represents a key in a JSON object.

func NewJSONSchemaKey added in v0.13.0 

func NewJSONSchemaKey(typ JSONKeyType, field string, paths ...string) *JSONSchemaKey

NewJSONSchemaKey creates a new SchemaField that is a json key.

func (*JSONSchemaKey) QualifiedName added in v0.13.0 

func (f *JSONSchemaKey) QualifiedName(schema Schema) string

func (*JSONSchemaKey) String added in v0.13.0 

func (f *JSONSchemaKey) String() string

type Model 

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

Model contains all the basic fields that make something a model, that is, the ID and some internal data used by kallax. To make a struct a model, it only needs to have Model embedded. 

type MyModel struct {
	kallax.Model
	Foo string
}

Custom name for the table can be specified using the struct tag `table` when embedding the Model. 

type MyModel struct {
	kallax.Model `table:"custom_name"`
}

Otherwise, the default name of the table is the name of the model converted to lower snake case. E.g: MyModel => my_model. No pluralization is done right now, but might be done in the future, so please, set the name of the tables yourself.

func NewModel 

func NewModel() Model

NewModel creates a new Model that is writable and not persisted.

func (*Model) AddVirtualColumn added in v0.12.0 

func (m *Model) AddVirtualColumn(name string, v Identifier)

AddVirtualColumn adds a new virtual column with the given name and value. This method is only intended for internal use. It is only exposed for technical reasons.

func (*Model) ClearVirtualColumns added in v0.12.0 

func (m *Model) ClearVirtualColumns()

ClearVirtualColumns clears all the previous virtual columns. This method is only intended for internal use. It is only exposed for technical reasons.

func (*Model) IsPersisted 

func (m *Model) IsPersisted() bool

IsPersisted returns whether the Model has already been persisted to the database or not.

func (*Model) IsWritable 

func (m *Model) IsWritable() bool

IsWritable returns whether this Model can be saved into the database. For example, a model with partially retrieved data is not writable, so it is not saved by accident and the data is corrupted. For example, if you select only 2 columns out of all the ones the table has, it will not be writable.

func (*Model) VirtualColumn added in v0.12.0 

func (m *Model) VirtualColumn(name string) Identifier

VirtualColumn returns the value of the virtual column with the given column name. This method is only intended for internal use. It is only exposed for technical reasons.

type NumericID added in v0.13.0 

type NumericID int64

NumericID is a wrapper for int64 that implements the Identifier interface. You don't need to actually use this as a type in your model. They will be automatically converted to and from in the generated code.

func (NumericID) Equals added in v0.13.0 

func (id NumericID) Equals(other Identifier) bool

Equals reports whether the ID and the given one are equals.

func (NumericID) IsEmpty added in v0.13.0 

func (id NumericID) IsEmpty() bool

IsEmpty returns whether the ID is empty or not. An empty ID means it has not been set yet.

func (NumericID) Raw added in v0.13.0 

func (id NumericID) Raw() interface{}

Raw returns the underlying raw value.

func (*NumericID) Scan added in v0.13.0 

func (id *NumericID) Scan(src interface{}) error

Scan implements the Scanner interface.

func (NumericID) String added in v0.13.0 

func (id NumericID) String() string

String returns the string representation of the ID.

func (NumericID) Value added in v0.13.0 

func (id NumericID) Value() (driver.Value, error)

Value implements the Valuer interface.

type Persistable 

type Persistable interface {
	// IsPersisted returns whether this Model is new in the store or not.
	IsPersisted() bool
	// contains filtered or unexported methods
}

Persistable must be implemented by those values that can be persisted.

type Query 

type Query interface {

	// Schema returns the schema of the query model.
	Schema() Schema
	// GetOffset returns the number of skipped rows in the query.
	GetOffset() uint64
	// GetLimit returns the max number of rows retrieved by the query.
	GetLimit() uint64
	// GetBatchSize returns the number of rows retrieved by the store per
	// batch. This is only used and has effect on queries with 1:N
	// relationships.
	GetBatchSize() uint64
	// contains filtered or unexported methods
}

Query is the common interface all queries must satisfy. The basic abilities of a query are compiling themselves to something executable and return some query settings.

type Record 

type Record interface {
	Identifiable
	Persistable
	Writable
	Relationable
	ColumnAddresser
	Valuer
	VirtualColumnContainer
}

Record is something that can be stored as a row in the database.

type RecordConstructor added in v0.12.0 

type RecordConstructor func() Record

RecordConstructor is a function that creates a record.

type RecordWithSchema added in v0.12.0 

type RecordWithSchema struct {
	Schema Schema
	Record Record
}

RecordWithSchema is a structure that contains both a record and its schema. Only for internal purposes.

type Relationable 

type Relationable interface {
	// NewRelationshipRecord returns a new Record for the relationship at the
	// given field.
	NewRelationshipRecord(string) (Record, error)
	// SetRelationship sets the relationship value at the given field.
	SetRelationship(string, interface{}) error
}

Relationable can perform operations related to relationships of a record.

type Relationship 

type Relationship struct {
	// Type is the kind of relationship this is.
	Type RelationshipType
	// Field is the field in the record where the relationship is.
	Field string
	// Schema is the schema of the relationship.
	Schema Schema
	// Filter establishes the filter to be applied when retrieving rows of the
	// relationships.
	Filter Condition
}

Relationship is a relationship with its schema and the field of te relation in the record.

type RelationshipType added in v0.12.0 

type RelationshipType byte

RelationshipType describes the type of the relationship. 

const (
	// OneToOne is a relationship between one record in a table and another in
	// another table.
	OneToOne RelationshipType = iota
	// OneToMany is a relationship between one record in a table and multiple
	// in another table.
	OneToMany
	// ManyToMany is a relationship between many records on both sides of the
	// relationship.
	// NOTE: It is not supported yet.
	ManyToMany
)

type ResultSet 

type ResultSet interface {
	// RawScan allows for raw scanning of fields in a result set.
	RawScan(...interface{}) error
	// Next moves the pointer to the next item in the result set and returns
	// if there was any.
	Next() bool
	// Get returns the next record of the given schema.
	Get(Schema) (Record, error)
	io.Closer
}

ResultSet is the common interface all result sets need to implement.

type Schema 

type Schema interface {
	// Alias returns the name of the alias used in queries for this schema.
	Alias() string
	// Table returns the table name.
	Table() string
	// ID returns the name of the identifier of the table.
	ID() SchemaField
	// Columns returns the list of columns in the schema.
	Columns() []SchemaField
	// ForeignKey returns the name of the foreign key of the given model field.
	ForeignKey(string) (*ForeignKey, bool)
	// WithAlias returns a new schema with the given string added to the
	// default alias.
	// Calling WithAlias on a schema returned by WithAlias not return a
	// schema based on the child, but another based on the parent.
	WithAlias(string) Schema
	// New creates a new record with the given schema.
	New() Record
	// contains filtered or unexported methods
}

Schema represents a table schema in the database. Contains some information like the table name, its columns, its identifier and so on.

type SchemaField 

type SchemaField interface {

	// String returns the string representation of the field. That is, its name.
	String() string
	// QualifiedString returns the name of the field qualified by the alias of
	// the given schema.
	QualifiedName(Schema) string
	// contains filtered or unexported methods
}

SchemaField is a named field in the table schema.

func AtJSONPath added in v0.13.0 

func AtJSONPath(field SchemaField, typ JSONKeyType, path ...string) SchemaField

AtJSONPath returns the schema field to query an arbitrary JSON element at the given path.

func NewSchemaField 

func NewSchemaField(name string) SchemaField

NewSchemaField creates a new schema field with the given name.

type Store 

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

Store is a structure capable of retrieving records from a concrete table in the database.

func NewStore 

func NewStore(db *sql.DB) *Store

NewStore returns a new Store instance.

func (*Store) Count 

func (s *Store) Count(q Query) (count int64, err error)

Count returns the number of rows selected by the given query.

func (*Store) Delete 

func (s *Store) Delete(schema Schema, record Record) error

Delete removes the record from the table. A non-new record with non-empty ID is required.

func (*Store) Find 

func (s *Store) Find(q Query) (ResultSet, error)

Find performs a query and returns a result set with the results.

func (*Store) Insert 

func (s *Store) Insert(schema Schema, record Record) error

Insert insert the given record in the table, returns error if no-new record is given. The record id is set if it's empty.

func (*Store) MustCount 

func (s *Store) MustCount(q Query) int64

MustCount returns the number of rows selected by the given query. It panics if the query fails.

func (*Store) MustFind 

func (s *Store) MustFind(q Query) ResultSet

MustFind performs a query and returns a result set with the results. It panics if the query fails.

func (*Store) RawExec 

func (s *Store) RawExec(sql string, params ...interface{}) (int64, error)

RawExec executes a raw SQL query with the given parameters and returns the number of affected rows.

func (*Store) RawQuery 

func (s *Store) RawQuery(sql string, params ...interface{}) (ResultSet, error)

RawQuery performs a raw SQL query with the given parameters and returns a result set with the results. WARNING: A result set created from a raw query can only be scanned using the RawScan method of ResultSet, instead of Scan.

func (*Store) Reload 

func (s *Store) Reload(schema Schema, record Record) error

Reload refreshes the record with the data in the database and makes the record writable.

func (*Store) Save 

func (s *Store) Save(schema Schema, record Record) (updated bool, err error)

Save inserts or updates the given record in the table.

func (*Store) Transaction 

func (s *Store) Transaction(callback func(*Store) error) error

Transaction executes the given callback in a transaction and rollbacks if an error is returned. The transaction is only open in the store passed as a parameter to the callback. If a transaction is already opened in this store, instead of opening a new one, the other will be reused.

func (*Store) Update 

func (s *Store) Update(schema Schema, record Record, cols ...SchemaField) (int64, error)

Update updates the given fields of a record in the table. All fields are updated if no fields are provided. For an update to take place, the record is required to have a non-empty ID and not to be a new record. Returns the number of updated rows and an error, if any.

type Timestamps 

type Timestamps struct {
	// CreatedAt is the time where the object was created.
	CreatedAt time.Time
	// UpdatedAt is the time where the object was updated.
	UpdatedAt time.Time
}

Timestamps contains the dates of the last time the model was created or deleted. Because this is such a common functionality in models, it is provided by default by the library. It is intended to be embedded in the model. 

type MyModel struct {
	kallax.Model
	kallax.Timestamps
	Foo string
}

func (*Timestamps) BeforeSave added in v0.12.0 

func (t *Timestamps) BeforeSave() error

BeforeSave updates the last time the model was updated every single time the model is saved, and the last time the model was created only if the model has no date of creation yet.

type ULID added in v0.13.0 

type ULID uuid.UUID

ULID is an ID type provided by kallax that is a lexically sortable UUID. The internal representation is an ULID (https://github.com/oklog/ulid). It already implements sql.Scanner and driver.Valuer, so it's perfectly safe for database usage.

func NewULID added in v0.13.0 

func NewULID() ULID

NewULID returns a new ULID, which is a lexically sortable UUID.

func (ULID) Equals added in v0.13.0 

func (id ULID) Equals(other Identifier) bool

Equals reports whether the ID and the given one are equals.

func (ULID) IsEmpty added in v0.13.0 

func (id ULID) IsEmpty() bool

IsEmpty returns whether the ID is empty or not. An empty ID means it has not been set yet.

func (ULID) Raw added in v0.13.0 

func (id ULID) Raw() interface{}

Raw returns the underlying raw value.

func (*ULID) Scan added in v0.13.0 

func (id *ULID) Scan(src interface{}) error

Scan implements the Scanner interface.

func (ULID) String added in v0.13.0 

func (id ULID) String() string

String returns the string representation of the ID.

func (ULID) Value added in v0.13.0 

func (id ULID) Value() (driver.Value, error)

Value implements the Valuer interface.

type UUID added in v0.13.0 

type UUID uuid.UUID

UUID is a wrapper type for uuid.UUID that implements the Identifier interface. You don't need to actually use this as a type in your model. They will be automatically converted to and from in the generated code.

func (UUID) Equals added in v0.13.0 

func (id UUID) Equals(other Identifier) bool

Equals reports whether the ID and the given one are equals.

func (UUID) IsEmpty added in v0.13.0 

func (id UUID) IsEmpty() bool

IsEmpty returns whether the ID is empty or not. An empty ID means it has not been set yet.

func (UUID) Raw added in v0.13.0 

func (id UUID) Raw() interface{}

Raw returns the underlying raw value.

func (*UUID) Scan added in v0.13.0 

func (id *UUID) Scan(src interface{}) error

Scan implements the Scanner interface.

func (UUID) String added in v0.13.0 

func (id UUID) String() string

String returns the string representation of the ID.

func (UUID) Value added in v0.13.0 

func (id UUID) Value() (driver.Value, error)

Value implements the Valuer interface.

type Valuer 

type Valuer interface {
	// Value returns the value of the given column, or an error if it does not
	// exist in the model.
	Value(string) (interface{}, error)
}

Valuer provides the values for columns.

type VirtualColumnContainer added in v0.12.0 

type VirtualColumnContainer interface {
	// ClearVirtualColumns removes all virtual columns.
	ClearVirtualColumns()
	// AddVirtualColumn adds a new virtual column with the given name and value
	AddVirtualColumn(string, Identifier)
	// VirtualColumn returns the virtual column with the given column name.
	VirtualColumn(string) Identifier
}

VirtualColumnContainer contains a collection of virtual columns and manages them.

type Writable 

type Writable interface {
	// IsWritable returns whether this Model can be saved into the database.
	IsWritable() bool
	// contains filtered or unexported methods
}

Writable must be implemented by those values that defines internally if they can be sent back to the database to be stored with its changes.

Source Files

View all Source files

Directories

Path Synopsis
Package generator implements the processor of source code and generator of kallax models based on Go source code.
 Package generator implements the processor of source code and generator of kallax models based on Go source code.
cli/kallax
IMPORTANT! This is auto generated code by https://github.com/src-d/go-kallax Please, do not touch the code below, and if you do, do it under your own risk.
 IMPORTANT! This is auto generated code by https://github.com/src-d/go-kallax Please, do not touch the code below, and if you do, do it under your own risk.
Package types provides implementation of some wrapper SQL types.
 Package types provides implementation of some wrapper SQL types.

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