gorm

package module
v1.10.0 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: May 14, 2020 License: MIT Imports: 21 Imported by: 0

README

GORM

The fantastic ORM library for Golang, aims to be developer friendly.

go report card wercker status Open Collective Backer Open Collective Sponsor MIT license GoDoc

Overview

  • Full-Featured ORM (almost)
  • Associations (Has One, Has Many, Belongs To, Many To Many, Polymorphism)
  • Hooks (Before/After Create/Save/Update/Delete/Find)
  • Preloading (eager loading)
  • Transactions
  • Composite Primary Key
  • SQL Builder
  • Auto Migrations
  • Logger
  • Extendable, write Plugins based on GORM callbacks
  • Every feature comes with tests
  • Developer Friendly

Getting Started

Contributing

You can help to deliver a better GORM, check out things you can do

License

© Jinzhu, 2013~time.Now

Released under the MIT License

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrRecordNotFound record not found error, happens when haven't find any matched data when looking up with a struct
	ErrRecordNotFound = errors.New("record not found")
	// ErrInvalidSQL invalid SQL error, happens when you passed invalid SQL
	ErrInvalidSQL = errors.New("invalid SQL")
	// ErrInvalidTransaction invalid transaction when you are trying to `Commit` or `Rollback`
	ErrInvalidTransaction = errors.New("no valid transaction")
	// ErrCantStartTransaction can't start transaction when you are trying to start one with `Begin`
	ErrCantStartTransaction = errors.New("can't start transaction")
	// ErrUnaddressable unaddressable value
	ErrUnaddressable = errors.New("using unaddressable value")
)
View Source 
var DefaultCallback = &Callback{}

DefaultCallback default callbacks defined by gorm

View Source 
var DefaultTableNameHandler = func(db *DB, defaultTableName string) string {
	return defaultTableName
}

DefaultTableNameHandler default table name handler

View Source 
var LogFormatter = func(values ...interface{}) (messages []interface{}) {
	if len(values) > 1 {
		var (
			sql             string
			formattedValues []string
			level           = values[0]
			currentTime     = "\n\033[33m[" + NowFunc().Format("2006-01-02 15:04:05") + "]\033[0m"
			source          = fmt.Sprintf("\033[35m(%v)\033[0m", values[1])
		)

		messages = []interface{}{source, currentTime}

		if level == "sql" {

			messages = append(messages, fmt.Sprintf(" \033[36;1m[%.2fms]\033[0m ", float64(values[2].(time.Duration).Nanoseconds()/1e4)/100.0))

			for _, value := range values[4].([]interface{}) {
				indirectValue := reflect.Indirect(reflect.ValueOf(value))
				if indirectValue.IsValid() {
					value = indirectValue.Interface()
					if t, ok := value.(time.Time); ok {
						formattedValues = append(formattedValues, fmt.Sprintf("'%v'", t.Format("2006-01-02 15:04:05")))
					} else if b, ok := value.([]byte); ok {
						if str := string(b); isPrintable(str) {
							formattedValues = append(formattedValues, fmt.Sprintf("'%v'", str))
						} else {
							formattedValues = append(formattedValues, "'<binary>'")
						}
					} else if r, ok := value.(driver.Valuer); ok {
						if value, err := r.Value(); err == nil && value != nil {
							formattedValues = append(formattedValues, fmt.Sprintf("'%v'", value))
						} else {
							formattedValues = append(formattedValues, "NULL")
						}
					} else {
						formattedValues = append(formattedValues, fmt.Sprintf("'%v'", value))
					}
				} else {
					formattedValues = append(formattedValues, "NULL")
				}
			}

			if numericPlaceHolderRegexp.MatchString(values[3].(string)) {
				sql = values[3].(string)
				for index, value := range formattedValues {
					placeholder := fmt.Sprintf(`\$%d([^\d]|$)`, index+1)
					sql = regexp.MustCompile(placeholder).ReplaceAllString(sql, value+"$1")
				}
			} else {
				formattedValuesLength := len(formattedValues)
				for index, value := range sqlRegexp.Split(values[3].(string), -1) {
					sql += value
					if index < formattedValuesLength {
						sql += formattedValues[index]
					}
				}
			}

			messages = append(messages, sql)
			messages = append(messages, fmt.Sprintf(" \n\033[36;31m[%v]\033[0m ", strconv.FormatInt(values[5].(int64), 10)+" rows affected or returned "))
		} else {
			messages = append(messages, "\033[31;1m")
			messages = append(messages, values[2:]...)
			messages = append(messages, "\033[0m")
		}
	}

	return
}
View Source 
var NowFunc = func() time.Time {
	return time.Now()
}

NowFunc returns current time, this function is exported in order to be able to give the flexibility to the developer to customize it according to their needs, e.g: 

gorm.NowFunc = func() time.Time {
  return time.Now().UTC()
}
View Source 
var ParseFieldStructForDialect = func(field *StructField, dialect Dialect) (fieldValue reflect.Value, sqlType string, size int, additionalType string) {
	// Get redirected field type
	var (
		reflectType = field.Struct.Type
		dataType    = field.TagSettings["TYPE"]
	)

	for reflectType.Kind() == reflect.Ptr {
		reflectType = reflectType.Elem()
	}

	fieldValue = reflect.Indirect(reflect.New(reflectType))

	if gormDataType, ok := fieldValue.Interface().(interface {
		GormDataType(Dialect) string
	}); ok {
		dataType = gormDataType.GormDataType(dialect)
	}

	if dataType == "" {
		var getScannerValue func(reflect.Value)
		getScannerValue = func(value reflect.Value) {
			fieldValue = value
			if _, isScanner := reflect.New(fieldValue.Type()).Interface().(sql.Scanner); isScanner && fieldValue.Kind() == reflect.Struct {
				getScannerValue(fieldValue.Field(0))
			}
		}
		getScannerValue(fieldValue)
	}

	if num, ok := field.TagSettings["SIZE"]; ok {
		size, _ = strconv.Atoi(num)
	} else {
		size = 255
	}

	additionalType = field.TagSettings["NOT NULL"] + " " + field.TagSettings["UNIQUE"]
	if value, ok := field.TagSettings["DEFAULT"]; ok {
		additionalType = additionalType + " DEFAULT " + value
	}

	return fieldValue, dataType, size, strings.TrimSpace(additionalType)
}

ParseFieldStructForDialect get field's sql data type

Functions

func Expr 

func Expr(expression string, args ...interface{}) *expr

Expr generate raw SQL expression, for example: 

DB.Model(&product).Update("price", gorm.Expr("price * ? + ?", 2, 100))

func IsByteArrayOrSlice 

func IsByteArrayOrSlice(value reflect.Value) bool

IsByteArrayOrSlice returns true of the reflected value is an array or slice

func IsRecordNotFoundError 

func IsRecordNotFoundError(err error) bool

IsRecordNotFoundError returns current error has record not found error or not

func RegisterDialect 

func RegisterDialect(name string, dialect Dialect)

RegisterDialect register new dialect

func ToDBName 

func ToDBName(name string) string

ToDBName convert string to db name

Types

type Association 

type Association struct {
	Error error
	// contains filtered or unexported fields
}

Association Mode contains some helper methods to handle relationship things easily.

func (*Association) Append 

func (association *Association) Append(values ...interface{}) *Association

Append append new associations for many2many, has_many, replace current association for has_one, belongs_to

func (*Association) Clear 

func (association *Association) Clear() *Association

Clear remove relationship between source & current associations, won't delete those associations

func (*Association) Count 

func (association *Association) Count() int

Count return the count of current associations

func (*Association) Delete 

func (association *Association) Delete(values ...interface{}) *Association

Delete remove relationship between source & passed arguments, but won't delete those arguments

func (*Association) Find 

func (association *Association) Find(value interface{}) *Association

Find find out all related associations

func (*Association) Replace 

func (association *Association) Replace(values ...interface{}) *Association

Replace replace current associations with new one

type Callback 

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

Callback is a struct that contains all CRUD callbacks 

Field `creates` contains callbacks will be call when creating object
Field `updates` contains callbacks will be call when updating object
Field `deletes` contains callbacks will be call when deleting object
Field `queries` contains callbacks will be call when querying object with query methods like Find, First, Related, Association...
Field `rowQueries` contains callbacks will be call when querying object with Row, Rows...
Field `processors` contains all callback processors, will be used to generate above callbacks in order

func (*Callback) Create 

func (c *Callback) Create() *CallbackProcessor

Create could be used to register callbacks for creating object 

db.Callback().Create().After("gorm:create").Register("plugin:run_after_create", func(*Scope) {
  // business logic
  ...

  // set error if some thing wrong happened, will rollback the creating
  scope.Err(errors.New("error"))
})

func (*Callback) Delete 

func (c *Callback) Delete() *CallbackProcessor

Delete could be used to register callbacks for deleting object, refer `Create` for usage

func (*Callback) Query 

func (c *Callback) Query() *CallbackProcessor

Query could be used to register callbacks for querying objects with query methods like `Find`, `First`, `Related`, `Association`... Refer `Create` for usage

func (*Callback) RowQuery 

func (c *Callback) RowQuery() *CallbackProcessor

RowQuery could be used to register callbacks for querying objects with `Row`, `Rows`, refer `Create` for usage

func (*Callback) Update 

func (c *Callback) Update() *CallbackProcessor

Update could be used to register callbacks for updating object, refer `Create` for usage

type CallbackProcessor 

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

CallbackProcessor contains callback informations

func (*CallbackProcessor) After 

func (cp *CallbackProcessor) After(callbackName string) *CallbackProcessor

After insert a new callback after callback `callbackName`, refer `Callbacks.Create`

func (*CallbackProcessor) Before 

func (cp *CallbackProcessor) Before(callbackName string) *CallbackProcessor

Before insert a new callback before callback `callbackName`, refer `Callbacks.Create`

func (*CallbackProcessor) Get 

func (cp *CallbackProcessor) Get(callbackName string) (callback func(scope *Scope))

Get registered callback 

db.Callback().Create().Get("gorm:create")

func (*CallbackProcessor) Register 

func (cp *CallbackProcessor) Register(callbackName string, callback func(scope *Scope))

Register a new callback, refer `Callbacks.Create`

func (*CallbackProcessor) Remove 

func (cp *CallbackProcessor) Remove(callbackName string)

Remove a registered callback 

db.Callback().Create().Remove("gorm:update_time_stamp_when_create")

func (*CallbackProcessor) Replace 

func (cp *CallbackProcessor) Replace(callbackName string, callback func(scope *Scope))

Replace a registered callback with new callback 

    db.Callback().Create().Replace("gorm:update_time_stamp_when_create", func(*Scope) {
		   scope.SetColumn("Created", now)
		   scope.SetColumn("Updated", now)
    })

type DB 

type DB struct {
	Value        interface{}
	Error        error
	RowsAffected int64
	// contains filtered or unexported fields
}

DB contains information for current db connection

func Open 

func Open(dialect string, args ...interface{}) (db *DB, err error)

Open initialize a new db connection, need to import driver first, e.g: 

import _ "github.com/go-sql-driver/mysql"
func main() {
  db, err := gorm.Open("mysql", "user:password@/dbname?charset=utf8&parseTime=True&loc=Local")
}

GORM has wrapped some drivers, for easier to remember driver's import path, so you could import the mysql driver with 

import _ "github.com/jinzhu/gorm/dialects/mysql"
// import _ "github.com/jinzhu/gorm/dialects/postgres"
// import _ "github.com/jinzhu/gorm/dialects/sqlite"
// import _ "github.com/jinzhu/gorm/dialects/mssql"

func (*DB) AddError 

func (s *DB) AddError(err error) error

AddError add error to the db

func (*DB) AddForeignKey 

func (s *DB) AddForeignKey(field string, dest string, onDelete string, onUpdate string) *DB

AddForeignKey Add foreign key to the given scope, e.g: 

db.Model(&User{}).AddForeignKey("city_id", "cities(id)", "RESTRICT", "RESTRICT")

func (*DB) AddIndex 

func (s *DB) AddIndex(indexName string, columns ...string) *DB

AddIndex add index for columns with given name

func (*DB) AddUniqueIndex 

func (s *DB) AddUniqueIndex(indexName string, columns ...string) *DB

AddUniqueIndex add unique index for columns with given name

func (*DB) Assign 

func (s *DB) Assign(attrs ...interface{}) *DB

Assign assign result with argument regardless it is found or not with `FirstOrInit` https://jinzhu.github.io/gorm/crud.html#firstorinit or `FirstOrCreate` https://jinzhu.github.io/gorm/crud.html#firstorcreate

func (*DB) Association 

func (s *DB) Association(column string) *Association

Association start `Association Mode` to handler relations things easir in that mode, refer: https://jinzhu.github.io/gorm/associations.html#association-mode

func (*DB) Attrs 

func (s *DB) Attrs(attrs ...interface{}) *DB

Attrs initialize struct with argument if record not found with `FirstOrInit` https://jinzhu.github.io/gorm/crud.html#firstorinit or `FirstOrCreate` https://jinzhu.github.io/gorm/crud.html#firstorcreate

func (*DB) AutoMigrate 

func (s *DB) AutoMigrate(values ...interface{}) *DB

AutoMigrate run auto migration for given models, will only add missing fields, won't delete/change current data

func (*DB) Begin 

func (s *DB) Begin() *DB

Begin begin a transaction

func (*DB) BlockGlobalUpdate 

func (s *DB) BlockGlobalUpdate(enable bool) *DB

BlockGlobalUpdate if true, generates an error on update/delete without where clause. This is to prevent eventual error with empty objects updates/deletions

func (*DB) Callback 

func (s *DB) Callback() *Callback

Callback return `Callbacks` container, you could add/change/delete callbacks with it 

db.Callback().Create().Register("update_created_at", updateCreated)

Refer https://jinzhu.github.io/gorm/development.html#callbacks

func (*DB) Close 

func (s *DB) Close() error

Close close current db connection. If database connection is not an io.Closer, returns an error.

func (*DB) Commit 

func (s *DB) Commit() *DB

Commit commit a transaction

func (*DB) CommonDB 

func (s *DB) CommonDB() SQLCommon

CommonDB return the underlying `*sql.DB` or `*sql.Tx` instance, mainly intended to allow coexistence with legacy non-GORM code.

func (*DB) Count 

func (s *DB) Count(value interface{}) *DB

Count get how many records for a model

func (*DB) Create 

func (s *DB) Create(value interface{}) *DB

Create insert the value into database

func (*DB) CreateTable 

func (s *DB) CreateTable(models ...interface{}) *DB

CreateTable create table for models

func (*DB) DB 

func (s *DB) DB() *sql.DB

DB get `*sql.DB` from current connection If the underlying database connection is not a *sql.DB, returns nil

func (*DB) Debug 

func (s *DB) Debug() *DB

Debug start debug mode

func (*DB) Delete 

func (s *DB) Delete(value interface{}, where ...interface{}) *DB

Delete delete value match given conditions, if the value has primary key, then will including the primary key as condition

func (*DB) Dialect 

func (s *DB) Dialect() Dialect

Dialect get dialect

func (*DB) DropColumn 

func (s *DB) DropColumn(column string) *DB

DropColumn drop a column

func (*DB) DropTable 

func (s *DB) DropTable(values ...interface{}) *DB

DropTable drop table for models

func (*DB) DropTableIfExists 

func (s *DB) DropTableIfExists(values ...interface{}) *DB

DropTableIfExists drop table if it is exist

func (*DB) Exec 

func (s *DB) Exec(sql string, values ...interface{}) *DB

Exec execute raw sql

func (*DB) Find 

func (s *DB) Find(out interface{}, where ...interface{}) *DB

Find find records that match given conditions

func (*DB) First 

func (s *DB) First(out interface{}, where ...interface{}) *DB

First find first record that match given conditions, order by primary key

func (*DB) FirstOrCreate 

func (s *DB) FirstOrCreate(out interface{}, where ...interface{}) *DB

FirstOrCreate find first matched record or create a new one with given conditions (only works with struct, map conditions) https://jinzhu.github.io/gorm/crud.html#firstorcreate

func (*DB) FirstOrInit 

func (s *DB) FirstOrInit(out interface{}, where ...interface{}) *DB

FirstOrInit find first matched record or initialize a new one with given conditions (only works with struct, map conditions) https://jinzhu.github.io/gorm/crud.html#firstorinit

func (*DB) Get 

func (s *DB) Get(name string) (value interface{}, ok bool)

Get get setting by name

func (*DB) GetErrors 

func (s *DB) GetErrors() []error

GetErrors get happened errors from the db

func (*DB) Group 

func (s *DB) Group(query string) *DB

Group specify the group method on the find

func (*DB) HasBlockGlobalUpdate 

func (s *DB) HasBlockGlobalUpdate() bool

HasBlockGlobalUpdate return state of block

func (*DB) HasTable 

func (s *DB) HasTable(value interface{}) bool

HasTable check has table or not

func (*DB) Having 

func (s *DB) Having(query interface{}, values ...interface{}) *DB

Having specify HAVING conditions for GROUP BY

func (*DB) InstantSet 

func (s *DB) InstantSet(name string, value interface{}) *DB

InstantSet instant set setting, will affect current db

func (*DB) Joins 

func (s *DB) Joins(query string, args ...interface{}) *DB

Joins specify Joins conditions 

db.Joins("JOIN emails ON emails.user_id = users.id AND emails.email = ?", "jinzhu@example.org").Find(&user)

func (*DB) Last 

func (s *DB) Last(out interface{}, where ...interface{}) *DB

Last find last record that match given conditions, order by primary key

func (*DB) Limit 

func (s *DB) Limit(limit interface{}) *DB

Limit specify the number of records to be retrieved

func (*DB) LogMode 

func (s *DB) LogMode(enable bool) *DB

LogMode set log mode, `true` for detailed logs, `false` for no log, default, will only print error logs

func (*DB) Model 

func (s *DB) Model(value interface{}) *DB

Model specify the model you would like to run db operations 

// update all users's name to `hello`
db.Model(&User{}).Update("name", "hello")
// if user's primary key is non-blank, will use it as condition, then will only update the user's name to `hello`
db.Model(&user).Update("name", "hello")

func (*DB) ModifyColumn 

func (s *DB) ModifyColumn(column string, typ string) *DB

ModifyColumn modify column to type

func (*DB) New 

func (s *DB) New() *DB

New clone a new db connection without search conditions

func (*DB) NewRecord 

func (s *DB) NewRecord(value interface{}) bool

NewRecord check if value's primary key is blank

func (*DB) NewScope 

func (s *DB) NewScope(value interface{}) *Scope

NewScope create a scope for current operation

func (*DB) Not 

func (s *DB) Not(query interface{}, args ...interface{}) *DB

Not filter records that don't match current conditions, similar to `Where`

func (*DB) Offset 

func (s *DB) Offset(offset interface{}) *DB

Offset specify the number of records to skip before starting to return the records

func (*DB) Omit 

func (s *DB) Omit(columns ...string) *DB

Omit specify fields that you want to ignore when saving to database for creating, updating

func (*DB) Or 

func (s *DB) Or(query interface{}, args ...interface{}) *DB

Or filter records that match before conditions or this one, similar to `Where`

func (*DB) Order 

func (s *DB) Order(value interface{}, reorder ...bool) *DB

Order specify order when retrieve records from database, set reorder to `true` to overwrite defined conditions 

db.Order("name DESC")
db.Order("name DESC", true) // reorder
db.Order(gorm.Expr("name = ? DESC", "first")) // sql expression

func (*DB) Pluck 

func (s *DB) Pluck(column string, value interface{}) *DB

Pluck used to query single column from a model as a map 

var ages []int64
db.Find(&users).Pluck("age", &ages)

func (*DB) Preload 

func (s *DB) Preload(column string, conditions ...interface{}) *DB

Preload preload associations with given conditions 

db.Preload("Orders", "state NOT IN (?)", "cancelled").Find(&users)

func (*DB) QueryExpr 

func (s *DB) QueryExpr() *expr

QueryExpr returns the query as expr object

func (*DB) Raw 

func (s *DB) Raw(sql string, values ...interface{}) *DB

Raw use raw sql as conditions, won't run it unless invoked by other methods 

db.Raw("SELECT name, age FROM users WHERE name = ?", 3).Scan(&result)

func (*DB) RecordNotFound 

func (s *DB) RecordNotFound() bool

RecordNotFound check if returning ErrRecordNotFound error

func (*DB) Related 

func (s *DB) Related(value interface{}, foreignKeys ...string) *DB

Related get related associations

func (*DB) RemoveForeignKey 

func (s *DB) RemoveForeignKey(field string, dest string) *DB

RemoveForeignKey Remove foreign key from the given scope, e.g: 

db.Model(&User{}).RemoveForeignKey("city_id", "cities(id)")

func (*DB) RemoveIndex 

func (s *DB) RemoveIndex(indexName string) *DB

RemoveIndex remove index with name

func (*DB) Rollback 

func (s *DB) Rollback() *DB

Rollback rollback a transaction

func (*DB) Row 

func (s *DB) Row() *sql.Row

Row return `*sql.Row` with given conditions

func (*DB) Rows 

func (s *DB) Rows() (*sql.Rows, error)

Rows return `*sql.Rows` with given conditions

func (*DB) Save 

func (s *DB) Save(value interface{}) *DB

Save update value in database, if the value doesn't have primary key, will insert it

func (*DB) Scan 

func (s *DB) Scan(dest interface{}) *DB

Scan scan value to a struct

func (*DB) ScanRows 

func (s *DB) ScanRows(rows *sql.Rows, result interface{}) error

ScanRows scan `*sql.Rows` to give struct

func (*DB) Scopes 

func (s *DB) Scopes(funcs ...func(*DB) *DB) *DB

Scopes pass current database connection to arguments `func(*DB) *DB`, which could be used to add conditions dynamically 

func AmountGreaterThan1000(db *gorm.DB) *gorm.DB {
    return db.Where("amount > ?", 1000)
}

func OrderStatus(status []string) func (db *gorm.DB) *gorm.DB {
    return func (db *gorm.DB) *gorm.DB {
        return db.Scopes(AmountGreaterThan1000).Where("status in (?)", status)
    }
}

db.Scopes(AmountGreaterThan1000, OrderStatus([]string{"paid", "shipped"})).Find(&orders)

Refer https://jinzhu.github.io/gorm/crud.html#scopes

func (*DB) Select 

func (s *DB) Select(query interface{}, args ...interface{}) *DB

Select specify fields that you want to retrieve from database when querying, by default, will select all fields; When creating/updating, specify fields that you want to save to database

func (*DB) Set 

func (s *DB) Set(name string, value interface{}) *DB

Set set setting by name, which could be used in callbacks, will clone a new db, and update its setting

func (*DB) SetJoinTableHandler 

func (s *DB) SetJoinTableHandler(source interface{}, column string, handler JoinTableHandlerInterface)

SetJoinTableHandler set a model's join table handler for a relation

func (*DB) SetLogger 

func (s *DB) SetLogger(log logger)

SetLogger replace default logger

func (*DB) SingularTable 

func (s *DB) SingularTable(enable bool)

SingularTable use singular table by default

func (*DB) SubQuery 

func (s *DB) SubQuery() *expr

SubQuery returns the query as sub query

func (*DB) Table 

func (s *DB) Table(name string) *DB

Table specify the table you would like to run db operations

func (*DB) Take 

func (s *DB) Take(out interface{}, where ...interface{}) *DB

Take return a record that match given conditions, the order will depend on the database implementation

func (*DB) Unscoped 

func (s *DB) Unscoped() *DB

Unscoped return all record including deleted record, refer Soft Delete https://jinzhu.github.io/gorm/crud.html#soft-delete

func (*DB) Update 

func (s *DB) Update(attrs ...interface{}) *DB

Update update attributes with callbacks, refer: https://jinzhu.github.io/gorm/crud.html#update

func (*DB) UpdateColumn 

func (s *DB) UpdateColumn(attrs ...interface{}) *DB

UpdateColumn update attributes without callbacks, refer: https://jinzhu.github.io/gorm/crud.html#update

func (*DB) UpdateColumns 

func (s *DB) UpdateColumns(values interface{}) *DB

UpdateColumns update attributes without callbacks, refer: https://jinzhu.github.io/gorm/crud.html#update

func (*DB) Updates 

func (s *DB) Updates(values interface{}, ignoreProtectedAttrs ...bool) *DB

Updates update attributes with callbacks, refer: https://jinzhu.github.io/gorm/crud.html#update

func (*DB) Where 

func (s *DB) Where(query interface{}, args ...interface{}) *DB

Where return a new relation, filter records with given conditions, accepts `map`, `struct` or `string` as conditions, refer http://jinzhu.github.io/gorm/crud.html#query

type DefaultForeignKeyNamer 

type DefaultForeignKeyNamer struct {
}

DefaultForeignKeyNamer contains the default foreign key name generator method

func (DefaultForeignKeyNamer) BuildKeyName 

func (DefaultForeignKeyNamer) BuildKeyName(kind, tableName string, fields ...string) string

BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference

type Dialect 

type Dialect interface {
	// GetName get dialect's name
	GetName() string

	// SetDB set db for dialect
	SetDB(db SQLCommon)

	// BindVar return the placeholder for actual values in SQL statements, in many dbs it is "?", Postgres using $1
	BindVar(i int) string
	// Quote quotes field name to avoid SQL parsing exceptions by using a reserved word as a field name
	Quote(key string) string
	// DataTypeOf return data's sql type
	DataTypeOf(field *StructField) string

	// HasIndex check has index or not
	HasIndex(tableName string, indexName string) bool
	// HasForeignKey check has foreign key or not
	HasForeignKey(tableName string, foreignKeyName string) bool
	// RemoveIndex remove index
	RemoveIndex(tableName string, indexName string) error
	// HasTable check has table or not
	HasTable(tableName string) bool
	// HasColumn check has column or not
	HasColumn(tableName string, columnName string) bool
	// ModifyColumn modify column's type
	ModifyColumn(tableName string, columnName string, typ string) error

	// LimitAndOffsetSQL return generated SQL with Limit and Offset, as mssql has special case
	LimitAndOffsetSQL(limit, offset interface{}) string
	// SelectFromDummyTable return select values, for most dbs, `SELECT values` just works, mysql needs `SELECT value FROM DUAL`
	SelectFromDummyTable() string
	// LastInsertIdReturningSuffix most dbs support LastInsertId, but postgres needs to use `RETURNING`
	LastInsertIDReturningSuffix(tableName, columnName string) string
	// DefaultValueStr
	DefaultValueStr() string

	// BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference
	BuildKeyName(kind, tableName string, fields ...string) string

	// CurrentDatabase return current database name
	CurrentDatabase() string
}

Dialect interface contains behaviors that differ across SQL database

func GetDialect 

func GetDialect(name string) (dialect Dialect, ok bool)

GetDialect gets the dialect for the specified dialect name

type Errors 

type Errors []error

Errors contains all happened errors

func (Errors) Add 

func (errs Errors) Add(newErrors ...error) Errors

Add adds an error

func (Errors) Error 

func (errs Errors) Error() string

Error format happened errors

func (Errors) GetErrors 

func (errs Errors) GetErrors() []error

GetErrors gets all happened errors

type Field 

type Field struct {
	*StructField
	IsBlank bool
	Field   reflect.Value
}

Field model field definition

func (*Field) Set 

func (field *Field) Set(value interface{}) (err error)

Set set a value to the field

type JoinTableForeignKey 

type JoinTableForeignKey struct {
	DBName            string
	AssociationDBName string
}

JoinTableForeignKey join table foreign key struct

type JoinTableHandler 

type JoinTableHandler struct {
	TableName   string          `sql:"-"`
	Source      JoinTableSource `sql:"-"`
	Destination JoinTableSource `sql:"-"`
}

JoinTableHandler default join table handler

func (JoinTableHandler) Add 

func (s JoinTableHandler) Add(handler JoinTableHandlerInterface, db *DB, source interface{}, destination interface{}) error

Add create relationship in join table for source and destination

func (JoinTableHandler) Delete 

func (s JoinTableHandler) Delete(handler JoinTableHandlerInterface, db *DB, sources ...interface{}) error

Delete delete relationship in join table for sources

func (*JoinTableHandler) DestinationForeignKeys 

func (s *JoinTableHandler) DestinationForeignKeys() []JoinTableForeignKey

DestinationForeignKeys return destination foreign keys

func (JoinTableHandler) JoinWith 

func (s JoinTableHandler) JoinWith(handler JoinTableHandlerInterface, db *DB, source interface{}) *DB

JoinWith query with `Join` conditions

func (*JoinTableHandler) Setup 

func (s *JoinTableHandler) Setup(relationship *Relationship, tableName string, source reflect.Type, destination reflect.Type)

Setup initialize a default join table handler

func (*JoinTableHandler) SourceForeignKeys 

func (s *JoinTableHandler) SourceForeignKeys() []JoinTableForeignKey

SourceForeignKeys return source foreign keys

func (JoinTableHandler) Table 

func (s JoinTableHandler) Table(db *DB) string

Table return join table's table name

type JoinTableHandlerInterface 

type JoinTableHandlerInterface interface {
	// initialize join table handler
	Setup(relationship *Relationship, tableName string, source reflect.Type, destination reflect.Type)
	// Table return join table's table name
	Table(db *DB) string
	// Add create relationship in join table for source and destination
	Add(handler JoinTableHandlerInterface, db *DB, source interface{}, destination interface{}) error
	// Delete delete relationship in join table for sources
	Delete(handler JoinTableHandlerInterface, db *DB, sources ...interface{}) error
	// JoinWith query with `Join` conditions
	JoinWith(handler JoinTableHandlerInterface, db *DB, source interface{}) *DB
	// SourceForeignKeys return source foreign keys
	SourceForeignKeys() []JoinTableForeignKey
	// DestinationForeignKeys return destination foreign keys
	DestinationForeignKeys() []JoinTableForeignKey
}

JoinTableHandlerInterface is an interface for how to handle many2many relations

type JoinTableSource 

type JoinTableSource struct {
	ModelType   reflect.Type
	ForeignKeys []JoinTableForeignKey
}

JoinTableSource is a struct that contains model type and foreign keys

type LogWriter 

type LogWriter interface {
	Println(v ...interface{})
}

LogWriter log writer interface

type Logger 

type Logger struct {
	LogWriter
}

Logger default logger

func (Logger) Print 

func (logger Logger) Print(values ...interface{})

Print format & print log

type Model 

type Model struct {
	ID        uint `gorm:"primary_key"`
	CreatedAt time.Time
	UpdatedAt time.Time
	DeletedAt *time.Time `sql:"index"`
}

Model base model definition, including fields `ID`, `CreatedAt`, `UpdatedAt`, `DeletedAt`, which could be embedded in your models 

type User struct {
  gorm.Model
}

type ModelStruct 

type ModelStruct struct {
	PrimaryFields []*StructField
	StructFields  []*StructField
	ModelType     reflect.Type
	// contains filtered or unexported fields
}

ModelStruct model definition

func (*ModelStruct) TableName 

func (s *ModelStruct) TableName(db *DB) string

TableName get model's table name

type Relationship 

type Relationship struct {
	Kind                         string
	PolymorphicType              string
	PolymorphicDBName            string
	PolymorphicValue             string
	ForeignFieldNames            []string
	ForeignDBNames               []string
	AssociationForeignFieldNames []string
	AssociationForeignDBNames    []string
	JoinTableHandler             JoinTableHandlerInterface
}

Relationship described the relationship between models

type RowQueryResult 

type RowQueryResult struct {
	Row *sql.Row
}

type RowsQueryResult 

type RowsQueryResult struct {
	Rows  *sql.Rows
	Error error
}

type SQLCommon 

type SQLCommon interface {
	Exec(query string, args ...interface{}) (sql.Result, error)
	Prepare(query string) (*sql.Stmt, error)
	Query(query string, args ...interface{}) (*sql.Rows, error)
	QueryRow(query string, args ...interface{}) *sql.Row
}

SQLCommon is the minimal database connection functionality gorm requires. Implemented by *sql.DB.

type Scope 

type Scope struct {
	Search  *search
	Value   interface{}
	SQL     string
	SQLVars []interface{}
	// contains filtered or unexported fields
}

Scope contain current operation's information when you perform any operation on the database

func (*Scope) AddToVars 

func (scope *Scope) AddToVars(value interface{}) string

AddToVars add value as sql's vars, used to prevent SQL injection

func (*Scope) Begin 

func (scope *Scope) Begin() *Scope

Begin start a transaction

func (*Scope) CallMethod 

func (scope *Scope) CallMethod(methodName string)

CallMethod call scope value's method, if it is a slice, will call its element's method one by one

func (*Scope) CombinedConditionSql 

func (scope *Scope) CombinedConditionSql() string

CombinedConditionSql return combined condition sql

func (*Scope) CommitOrRollback 

func (scope *Scope) CommitOrRollback() *Scope

CommitOrRollback commit current transaction if no error happened, otherwise will rollback it

func (*Scope) DB 

func (scope *Scope) DB() *DB

DB return scope's DB connection

func (*Scope) Dialect 

func (scope *Scope) Dialect() Dialect

Dialect get dialect

func (*Scope) Err 

func (scope *Scope) Err(err error) error

Err add error to Scope

func (*Scope) Exec 

func (scope *Scope) Exec() *Scope

Exec perform generated SQL

func (*Scope) FieldByName 

func (scope *Scope) FieldByName(name string) (field *Field, ok bool)

FieldByName find `gorm.Field` with field name or db name

func (*Scope) Fields 

func (scope *Scope) Fields() []*Field

Fields get value's fields

func (*Scope) Get 

func (scope *Scope) Get(name string) (interface{}, bool)

Get get setting by name

func (*Scope) GetModelStruct 

func (scope *Scope) GetModelStruct() *ModelStruct

GetModelStruct get value's model struct, relationships based on struct and tag definition

func (*Scope) GetStructFields 

func (scope *Scope) GetStructFields() (fields []*StructField)

GetStructFields get model's field structs

func (*Scope) HasColumn 

func (scope *Scope) HasColumn(column string) bool

HasColumn to check if has column

func (*Scope) HasError 

func (scope *Scope) HasError() bool

HasError check if there are any error

func (*Scope) IndirectValue 

func (scope *Scope) IndirectValue() reflect.Value

IndirectValue return scope's reflect value's indirect value

func (*Scope) InstanceGet 

func (scope *Scope) InstanceGet(name string) (interface{}, bool)

InstanceGet get instance setting from current operation

func (*Scope) InstanceID 

func (scope *Scope) InstanceID() string

InstanceID get InstanceID for scope

func (*Scope) InstanceSet 

func (scope *Scope) InstanceSet(name string, value interface{}) *Scope

InstanceSet set instance setting for current operation, but not for operations in callbacks, like saving associations callback

func (*Scope) Log 

func (scope *Scope) Log(v ...interface{})

Log print log message

func (*Scope) New 

func (scope *Scope) New(value interface{}) *Scope

New create a new Scope without search information

func (*Scope) NewDB 

func (scope *Scope) NewDB() *DB

NewDB create a new DB without search information

func (*Scope) OmitAttrs 

func (scope *Scope) OmitAttrs() []string

OmitAttrs return omitted attributes

func (*Scope) PrimaryField 

func (scope *Scope) PrimaryField() *Field

PrimaryField return scope's main primary field, if defined more that one primary fields, will return the one having column name `id` or the first one

func (*Scope) PrimaryFields 

func (scope *Scope) PrimaryFields() (fields []*Field)

PrimaryFields return scope's primary fields

func (*Scope) PrimaryKey 

func (scope *Scope) PrimaryKey() string

PrimaryKey get main primary field's db name

func (*Scope) PrimaryKeyValue 

func (scope *Scope) PrimaryKeyValue() interface{}

PrimaryKeyValue get the primary key's value

func (*Scope) PrimaryKeyZero 

func (scope *Scope) PrimaryKeyZero() bool

PrimaryKeyZero check main primary field's value is blank or not

func (*Scope) Quote 

func (scope *Scope) Quote(str string) string

Quote used to quote string to escape them for database

func (*Scope) QuotedTableName 

func (scope *Scope) QuotedTableName() (name string)

QuotedTableName return quoted table name

func (*Scope) Raw 

func (scope *Scope) Raw(sql string) *Scope

Raw set raw sql

func (*Scope) SQLDB 

func (scope *Scope) SQLDB() SQLCommon

SQLDB return *sql.DB

func (*Scope) SelectAttrs 

func (scope *Scope) SelectAttrs() []string

SelectAttrs return selected attributes

func (*Scope) Set 

func (scope *Scope) Set(name string, value interface{}) *Scope

Set set value by name

func (*Scope) SetColumn 

func (scope *Scope) SetColumn(column interface{}, value interface{}) error

SetColumn to set the column's value, column could be field or field's name/dbname

func (*Scope) SkipLeft 

func (scope *Scope) SkipLeft()

SkipLeft skip remaining callbacks

func (*Scope) TableName 

func (scope *Scope) TableName() string

TableName return table name

func (*Scope) WrapPlaceholder 

func (scope *Scope) WrapPlaceholder(field *Field, placeholder string) string

WrapPlaceholder returns a field's value placeholder wrapped into wrapper function

type StructField 

type StructField struct {
	DBName          string
	Name            string
	Names           []string
	IsPrimaryKey    bool
	IsNormal        bool
	IsIgnored       bool
	IsScanner       bool
	HasDefaultValue bool
	Tag             reflect.StructTag
	TagSettings     map[string]string
	Struct          reflect.StructField
	IsForeignKey    bool
	Relationship    *Relationship
}

StructField model field's struct definition

Source Files

View all Source files

Directories

Path Synopsis
dialects
mssql
mysql
postgres
sqlite

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.