import "github.com/go-pg/pg/orm"
composite.go composite_create.go composite_drop.go composite_parser.go count_estimate.go delete.go field.go format.go hook.go inflection.go insert.go join.go model.go model_discard.go model_func.go model_scan.go model_slice.go model_table.go model_table_m2m.go model_table_many.go model_table_slice.go model_table_struct.go orm.go query.go relation.go result.go select.go struct_filter.go table.go table_create.go table_drop.go table_params.go tables.go types.go update.go util.go
const (
AfterQueryHookFlag = uint16(1) << iota
BeforeSelectQueryHookFlag
AfterSelectHookFlag
BeforeInsertHookFlag
AfterInsertHookFlag
BeforeUpdateHookFlag
AfterUpdateHookFlag
BeforeDeleteHookFlag
AfterDeleteHookFlag
)func CreateComposite(db DB, model interface{}, opt *CreateCompositeOptions) error
func CreateTable(db DB, model interface{}, opt *CreateTableOptions) error
Delete deletes a given model from the db
func DropComposite(db DB, model interface{}, opt *DropCompositeOptions) error
func DropTable(db DB, model interface{}, opt *DropTableOptions) error
ForceDelete force deletes a given model from the db
nolint
func RegisterTable(strct interface{})RegisterTable registers a struct as SQL table. It is usually used to register intermediate table in many to many relationship.
func Scan(values ...interface{}) scanValuesModelnolint
SetTableNameInflector overrides the default func that pluralizes model name to get table name, e.g. my_article becomes my_articles.
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, rd types.Reader, n int) error
}ColumnScanner is used to scan column values.
type CreateCompositeOptions struct {
Varchar int // replaces PostgreSQL data type `text` with `varchar(n)`
}type CreateTableOptions struct {
Varchar int // replaces PostgreSQL data type `text` with `varchar(n)`
Temp bool
IfNotExists bool
// FKConstraints causes CreateTable to create foreign key constraints
// for has one relations. ON DELETE hook can be added using tag
// `sql:"on_delete:RESTRICT"` on foreign key field. ON UPDATE hook can be added using tag
// `sql:"on_update:CASCADE"`
FKConstraints bool
}type DB interface {
Model(model ...interface{}) *Query
ModelContext(c context.Context, model ...interface{}) *Query
Select(model interface{}) error
Insert(model ...interface{}) error
Update(model interface{}) error
Delete(model interface{}) error
ForceDelete(model interface{}) error
Exec(query interface{}, params ...interface{}) (Result, error)
ExecContext(c context.Context, query interface{}, params ...interface{}) (Result, error)
ExecOne(query interface{}, params ...interface{}) (Result, error)
ExecOneContext(c context.Context, query interface{}, params ...interface{}) (Result, error)
Query(model, query interface{}, params ...interface{}) (Result, error)
QueryContext(c context.Context, model, query interface{}, params ...interface{}) (Result, error)
QueryOne(model, query interface{}, params ...interface{}) (Result, error)
QueryOneContext(c context.Context, 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 struct {
// contains filtered or unexported fields
}func (m Discard) AddModel(ColumnScanner) error
func (m Discard) NewModel() ColumnScanner
type Field struct {
Field reflect.StructField
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
OnDelete string
OnUpdate string
// contains filtered or unexported fields
}type Formatter struct {
// contains filtered or unexported fields
}type HooklessModel interface {
// Init is responsible to initialize/reset model state.
// It is called only once no matter how many rows
// were returned by database.
Init() error
// NewModel returns ColumnScanner that is used to scan columns
// from the current row. It is called once for every row.
NewModel() ColumnScanner
// AddModel adds ColumnScanner created by NewModel to the Collection.
AddModel(ColumnScanner) error
}type Model interface {
HooklessModel
AfterQuery(context.Context, DB) error
BeforeSelectQuery(context.Context, DB, *Query) (*Query, error)
AfterSelect(context.Context, DB) error
BeforeInsert(context.Context, DB) error
AfterInsert(context.Context, DB) error
BeforeUpdate(context.Context, DB) error
AfterUpdate(context.Context, DB) error
BeforeDelete(context.Context, DB) error
AfterDelete(context.Context, DB) error
}type Query struct {
// contains filtered or unexported fields
}Apply calls the fn passing the Query as an argument.
Column adds a column to the Query quoting it according to PostgreSQL rules. Does not expand params like ?TableAlias etc. ColumnExpr can be used to bypass quoting restriction or for params expansion. Column name can be:
- column_name, - table_alias.column_name, - table_alias.*.
ColumnExpr adds column expression to the Query.
Copy returns copy of the Query.
CopyFrom is an alias from DB.CopyFrom.
CopyTo is an alias from DB.CopyTo.
Count returns number of rows matching the query using count aggregate function.
CountEstimate uses EXPLAIN to get estimated number of rows returned 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 (q *Query) CreateTable(opt *CreateTableOptions) error
Delete deletes the model. When model has deleted_at column the row is soft deleted instead.
Deleted adds `WHERE deleted_at IS NOT NULL` clause for soft deleted models.
func (q *Query) DropTable(opt *DropTableOptions) error
ExcludeColumn excludes a column from the list of to be selected columns.
Exec is an alias for DB.Exec.
ExecOne is an alias for DB.ExecOne.
Exists returns true or false depending if there are any rows matching the query.
First sorts rows by primary key and selects the first row. It is a shortcut for:
q.OrderExpr("id ASC").Limit(1)
ForEach calls the function for each row returned by the query without loading all rows into the memory. Function accepts a struct, pointer to a struct, orm.Model, or values for columns in a row. Function must return an error.
Delete forces delete of the model with deleted_at column.
func (q *Query) GetModel() TableModel
Insert inserts the model.
JoinOn appends join condition to the last join.
Last sorts rows by primary key and selects the last row. It is a shortcut for:
q.OrderExpr("id DESC").Limit(1)
New returns new zero Query binded to the current db.
Order adds sort order to the Query quoting column name. Does not expand params like ?TableAlias etc. OrderExpr can be used to bypass quoting restriction or for params expansion.
Order adds sort order to the Query.
Query is an alias for DB.Query.
QueryOne is an alias for DB.QueryOne.
Relation adds a relation to the query. Relation name can be:
- RelationName to select all columns, - RelationName.column_name, - RelationName._ to join relation without selecting relation columns.
Returning adds a RETURNING clause to the query.
`Returning("NULL")` can be used to suppress default returning clause generated by go-pg for INSERT queries to get values for null columns.
Select selects the model.
SelectAndCount runs Select and Count in two goroutines, waits for them to finish and returns the result. If query limit is -1 it does not select any data and only counts the results.
func (q *Query) SelectAndCountEstimate(threshold int, values ...interface{}) (count int, firstErr error)
SelectAndCountEstimate runs Select and CountEstimate in two goroutines, waits for them to finish and returns the result. If query limit is -1 it does not select any data and only counts the results.
SelectOrInsert selects the model inserting one if it does not exist. It returns true when model was inserted.
Update updates the model.
Update updates the model omitting null columns.
Value overwrites model value for the column in INSERT and UPDATE queries.
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)
WhereIn is a shortcut for Where and pg.In:
WhereInMulti is a shortcut for Where and pg.InMulti:
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)
WherePK adds condition based on the model primary keys. Usually it is the same as:
Where("id = ?id")
WhereStruct generates conditions for the struct fields with non-zero values:
- Foo int - Where("foo = ?", strct.Foo)
- Foo []int - Where("foo = ANY(?)", pg.Array(strct.Foo))
- FooNEQ int - Where("foo != ?", strct.Foo)
- FooExclude int - Where("foo != ?", strct.Foo)
- FooGT int - Where("foo > ?", strct.Foo)
- FooGTE int - Where("foo >= ?", strct.Foo)
- FooLT int - Where("foo < ?", strct.Foo)
- FooLTE int - Where("foo <= ?", strct.Foo)
urlvalues.Decode can be used to decode url.Values into the struct.
Following field tags are recognized:
- pg:"-" - field is ignored. - pg:",nowhere" - field is decoded but is ignored by WhereStruct. - pg:",nodecode" - field is not decoded but is used by WhereStruct. - pg:",required" - condition is added for zero values as well.
With adds subq as common table expression with the given name.
WrapWith creates new Query and adds to it current query as common table expression with the given name.
type QueryAppender interface {
AppendQuery(fmter QueryFormatter, b []byte) ([]byte, error)
}type QueryFormatter interface {
FormatQuery(b []byte, query string, params ...interface{}) []byte
}type Relation struct {
Type int
Field *Field
JoinTable *Table
FKs []*Field
Polymorphic *Field
FKValues []*Field
M2MTableName types.Q
M2MTableAlias types.Q
BaseFKs []string
JoinFKs []string
}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
}Result summarizes an executed SQL command.
type Table struct {
Type reflect.Type
TypeName string
Alias types.Q
ModelName string
Name string
FullName types.Q
FullNameForSelects types.Q
Tablespace types.Q
Fields []*Field // PKs + DataFields
PKs []*Field
DataFields []*Field
FieldsMap map[string]*Field
Methods map[string]*Method
Relations map[string]*Relation
Unique map[string][]*Field
SoftDeleteField *Field
// contains filtered or unexported fields
}Table represents a SQL table created from Go struct.
GetTable returns a Table for a struct type.
type TableModel interface {
Model
IsNil() bool
Table() *Table
Relation() *Relation
AppendParam(QueryFormatter, []byte, string) ([]byte, bool)
Join(string, func(*Query) (*Query, error)) *join
GetJoin(string) *join
GetJoins() []join
AddJoin(join) *join
Root() reflect.Value
Index() []int
ParentIndex() []int
Mount(reflect.Value)
Kind() reflect.Kind
Value() reflect.Value
// contains filtered or unexported methods
}Package orm imports 22 packages (graph) and is imported by 74 packages. Updated 2019-05-18. Refresh now. Tools for package owners.