pop

package module
v4.2.0+incompatible Latest Latest
Warning

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

 Go to latest Published: Mar 12, 2018 License: MIT Imports: 44 Imported by: 0

README

POP GoDoc Build Status

A Tasty Treat For All Your Database Needs

So what does Pop do exactly? Well, it wraps the absolutely amazing https://github.com/jmoiron/sqlx library. It cleans up some of the common patterns and workflows usually associated with dealing with databases in Go.

Pop makes it easy to do CRUD operations, run migrations, and build/execute queries. Is Pop an ORM? I'll leave that up to you, the reader, to decide.

Pop, by default, follows conventions that were defined by the ActiveRecord Ruby gem, http://www.rubyonrails.org. What does this mean?

  • Tables must have an "id" column and a corresponding "ID" field on the struct being used.
  • If there is a timestamp column named "created_at", "CreatedAt" on the struct, it will be set with the current time when the record is created.
  • If there is a timestamp column named "updated_at", "UpdatedAt" on the struct, it will be set with the current time when the record is updated.
  • Default database table names are lowercase, plural, and underscored versions of the struct name. Examples: User{} is "users", FooBar{} is "foo_bars", etc...

Supported Databases

  • PostgreSQL (>= 9.3)
  • MySQL (>= 5.7)
  • SQLite (>= 3.x)
  • CockroachDB (>= 1.1.1)

Connecting to Databases

Pop is easily configured using a YAML file. The configuration file should be stored in config/database.yml or database.yml.

Example Configuration File
development:
  dialect: "postgres"
  database: "your_db_development"
  host: "localhost"
  port: "5432"
  user: "postgres"
  password: "postgres"

test:
  dialect: "mysql"
  database: "your_db_test"
  host: "localhost"
  port: "3306"
  user: "root"
  password: "root"

staging:
  dialect: "sqlite3"
  database: "./staging.sqlite"

production:
  dialect: "postgres"
  url: {{ env "DATABASE_URL" }}

Note that the database.yml file is also a Go template, so you can use Go template syntax. There are two special functions that are included, env and envOr.

  • env - This function will look for the named environment variable and insert it into your file. This is useful for configuring production databases without having to store secret information in your repository. {{ env "DATABASE_URL" }}
  • envOr - This function will look for the named environment variable and use it. If the variable can not be found a default value will be used. {{ envOr "MYSQL_HOST" "localhost" }}

You can generate a default configuration file using the init command:

$ soda g config

The default will generate a database.yml file in the current directory for a PostgreSQL database. You can override the type of database using the -t flag and passing in any of the supported database types: postgres, cockroach, mysql, or sqlite3.

CockroachDB currently works best if you DO NOT use a url and instead define each key item. Because CockroachDB more or less uses the same driver as postgres you have the same configuration options for both. In production you will also want to make sure you are using a secure cluster and have set all the needed connection parameters for said secure connection. If you do not set the sslmode or set it to disable this will put dump and load commands into --insecure mode.

In your code

Once you have a configuration file defined you can easily connect to one of these connections in your application.

db, err := pop.Connect("development")
if err != nil {
  log.Panic(err)
}

Now that you have your connection to the database you can start executing queries against it.

CLI Support

Pop features CLI support via the soda command for the following operations:

  • creating databases
  • dropping databases
  • migrating databases
Installing CLI Support
$ go get github.com/gobuffalo/pop/...
$ go install github.com/gobuffalo/pop/soda
Creating Databases

Assuming you defined a configuration file like that described in the above section you can automatically create those databases using the soda command:

Create All Databases
$ soda create -a
Create a Specific Database
$ soda create -e development
Dropping Databases

Assuming you defined a configuration file like that described in the above section you can automatically drop those databases using the soda command:

Drop All Databases
$ soda drop -a
Drop a Specific Database
$ soda drop -e development
Models

The soda command supports the generation of models.

A full list of commands available for model generation can be found by asking for help:

$ soda generate help
Generate Models

The soda command will generate Go models and, optionally, the associated migrations for you.

$ soda generate model user name:text email:text

Running this command with generate the following files:

models/user.go
models/user_test.go
migrations/20170115024143_create_users.up.fizz
migrations/20170115024143_create_users.down.fizz

The models/user.go file contains a structure named User with fields ID, CreatedAt, UpdatedAt, Name, and Email. The first three correspond to the columns commonly found in ActiveRecord models as mentioned before, and the last two correspond to the additional fields specified on the command line. The known types are:

  • text (string in Go)
  • time or timestamp (time.Time)
  • nulls.Text (nulls.String) which corresponds to a nullifyable string, which can be distinguished from an empty string
  • uuid (uuid.UUID)
  • Other types are passed thru and are used as Fizz types.

The models/user_test.go contains tests for the User model and they must be implemented by you.

The other two files correspond to the migrations as explained below.

Migrations

The soda command supports the creation and running of migrations.

A full list of commands available for migration can be found by asking for help:

$ soda migrate --help
Create Migrations

The soda command will generate SQL migrations (both the up and down) files for you.

$ soda generate fizz name_of_migration

Running this command with generate the following files:

./migrations/20160815134952_name_of_migration.up.fizz
./migrations/20160815134952_name_of_migration.down.fizz

The generated files are fizz files. Fizz lets you use a common DSL for generating migrations. This means the same .fizz file can be run against any of the supported dialects of Pop! Find out more about Fizz

If you want to generate old fashion .sql files you can use the -t flag for that:

$ soda generate sql name_of_migration

Running this command with generate the following files:

./migrations/20160815134952_name_of_migration.up.sql
./migrations/20160815134952_name_of_migration.down.sql

The soda migrate command supports both .fizz and .sql files, so you can mix and match them to suit your needs.

Running Migrations

The soda command will run the migrations using the following command:

$ soda migrate up

Migrations will be run in sequential order. The previously run migrations will be kept track of in a table named schema_migrations in the database.

Migrations can also be run in reverse to rollback the schema.

$ soda migrate down
Find
user := models.User{}
err := tx.Find(&user, id)
Query
tx := models.DB
query := tx.Where("id = 1").Where("name = 'Mark'")
users := []models.User{}
err := query.All(&users)

err = tx.Where("id in (?)", 1, 2, 3).All(&users)
Join Query
// page: page number
// perpage: limit
roles := []models.UserRole{}
query := models.DB.LeftJoin("roles", "roles.id=user_roles.role_id").
  LeftJoin("users u", "u.id=user_roles.user_id").
  Where(`roles.name like ?`, name).Paginate(page, perpage)

count, _ := query.Count(models.UserRole{})
count, _ := query.CountByField(models.UserRole{}, "*")
sql, args := query.ToSQL(&pop.Model{Value: models.UserRole{}}, "user_roles.*",
  "roles.name as role_name", "u.first_name", "u.last_name")
//log.Printf("sql: %s, args: %v", sql, args)
err := models.DB.RawQuery(sql, args...).All(&roles)
Eager Loading

pop allows you to perform an eager loading for associations defined in a model. By using pop.Connection.Eager() function plus some fields tags predefined in your model you can extract associated data from a model.

type User struct {
  ID           uuid.UUID
  Email        string
  Password     string
  Books        Books     `has_many:"books" order_by:"title asc"`
  FavoriteSong Song      `has_one:"song" fk_id:"u_id"`
  Houses       Addresses `many_to_many:"users_addresses"`
}

type Book struct {
  ID      uuid.UUID
  Title   string
  Isbn    string
  User    User        `belongs_to:"user"`
  UserID  uuid.UUID
  Writers Writers     `has_many:"writers"`
}

type Writer struct {
   ID     uuid.UUID   `db:"id"`
   Name   string      `db:"name"``
   BookID uuid.UUID   `db:"book_id"`
   Book   Book        `belongs_to:"book"`
}

type Song struct {
  ID      uuid.UUID
  Title   string
  UserID  uuid.UUID   `db:"u_id"`
}

type Address struct {
  ID           uuid.UUID
  Street       string
  HouseNumber  int
}

type Addresses []Address

has_many: will load all records from the books table that have a column named user_id or the column specified with fk_id that matches the User.ID value.

belongs_to: will load a record from users table that have a column named id that matches with Book.UserID value.

has_one: will load a record from the songs table that have a column named user_id or the column specified with fk_id that matches the User.ID value.

many_to_many: will load all records from the addresses table through the table users_addresses. Table users_addresses MUST define address_id and user_id columns to match User.ID and Address.ID values. You can also define a fk_id tag that will be used in the target association i.e addresses table.

fk_id: defines the column name in the target association that matches model ID. In the example above Song has a column named u_id that represents id of users table. When loading FavoriteSong, u_id will be used instead of user_id.

 order_by: used in has_many and many_to_many to indicate the order for the association when loading. The format to use is order_by:"<column_name> <asc | desc>"

u := Users{}
err := tx.Eager().Where("name = 'Mark'").All(&u)  // preload all associations for user with name 'Mark', i.e Books, Houses and FavoriteSong
err  = tx.Eager("Books").Where("name = 'Mark'").All(&u) // preload only Books association for user with name 'Mark'.
Eager Loading Nested Associations

pop allows you to eager loading nested associations by using . character to concatenate them. Take a look at the example bellow.

tx.Eager("Books.User").First(&u)  // will load all Books for u and for every Book will load the user which will be the same as u.

 tx.Eager("Books.Writers").First(&u)  // will load all Books for u and for every Book will load all Writers.

tx.Eager("Books.Writers.Book").First(&u)  // will load all Books for u and for every Book will load all Writers and for every writer will load the Book association.

tx.Eager("Books.Writers").Eager("FavoriteSong").First(&u)  // will load all Books for u and for every Book will load all Writers. And Also it will load the favorite song for user.
Callbacks

Pop provides a means to execute code before and after database operations. This is done by defining specific methods on your models. For example, to hash a user password you may want to define the following method:

type User struct {
	ID       uuid.UUID
	Email    string
	Password string
}

func (u *User) BeforeSave(tx *pop.Connection) error {
	hash, err := bcrypt.GenerateFromPassword([]byte(u.Password), bcrypt.DefaultCost)
	if err != nil {
		return errors.WithStack(err)
	}

	u.Password = string(hash)

	return nil
}

The available callbacks include:

  • BeforeSave
  • BeforeCreate
  • BeforeUpdate
  • BeforeDestroy
  • AfterSave
  • AfterCreate
  • AfterUpdate
  • AfterDestroy
  • AfterFind
Further reading

The Unofficial pop Book: a gentle introduction to new users.

Documentation

Overview

Package pop wraps the absolutely amazing https://github.com/jmoiron/sqlx library. It cleans up some of the common patterns and workflows usually associated with dealing with databases in Go.

Pop makes it easy to do CRUD operations, run migrations, and build/execute queries. Is Pop an ORM? I'll leave that up to you, the reader, to decide.

Pop, by default, follows conventions that were defined by the ActiveRecord Ruby gem, http://www.rubyonrails.org. What does this mean?

* Tables must have an "id" column and a corresponding "ID" field on the `struct` being used. * If there is a timestamp column named "created_at", "CreatedAt" on the `struct`, it will be set with the current time when the record is created. * If there is a timestamp column named "updated_at", "UpdatedAt" on the `struct`, it will be set with the current time when the record is updated. * Default databases are lowercase, underscored versions of the `struct` name. Examples: User{} is "users", FooBar{} is "foo_bars", etc...

Index

Constants

This section is empty.

Variables

View Source 
var AvailableDialects = []string{"postgres", "mysql", "cockroach"}
View Source 
var Color = true

Color mode, to toggle colored logs

View Source 
var ConfigName = "database.yml"

ConfigName is the name of the YAML databases config file

View Source 
var Connections = map[string]*Connection{}

Connections contains all of the available connections

View Source 
var Debug = false

Debug mode, to toggle verbose log traces

View Source 
var Log = func(s string, args ...interface{}) {
	if Debug {
		if len(args) > 0 {
			xargs := make([]string, len(args))
			for i, a := range args {
				switch a.(type) {
				case string:
					xargs[i] = fmt.Sprintf("%q", a)
				default:
					xargs[i] = fmt.Sprintf("%v", a)
				}
			}
			s = fmt.Sprintf("%s | %s", s, xargs)
		}
		if Color {
			s = color.YellowString(s)
		}
		logger.Println(s)
	}
}

Log a formatted string to the logger

View Source 
var PaginatorPageKey = "page"

PaginatorPageKey is the query parameter holding the current page index

View Source 
var PaginatorPerPageDefault = 20

PaginatorPerPageDefault is the amount of results per page

View Source 
var PaginatorPerPageKey = "per_page"

PaginatorPerPageKey is the query parameter holding the amount of results per page to override the default one

Functions

func AddLookupPaths 

func AddLookupPaths(paths ...string) error

AddLookupPaths add paths to the current lookup paths list

func CreateDB 

func CreateDB(c *Connection) error

CreateDB creates a database, given a connection definition

func DropDB 

func DropDB(c *Connection) error

DropDB drops an existing database, given a connection definition

func LoadConfigFile 

func LoadConfigFile() error

LoadConfigFile loads a POP config file from the configured lookup paths

func LoadFrom 

func LoadFrom(r io.Reader) error

LoadFrom reads a configuration from the reader and sets up the connections

func LookupPaths 

func LookupPaths() []string

LookupPaths returns the current configuration lookup paths

func MigrationCreate 

func MigrationCreate(path, name, ext string, up, down []byte) error

MigrationCreate writes contents for a given migration in normalized files

Types

type Connection 

type Connection struct {
	ID      string
	Store   store
	Dialect dialect
	Elapsed int64
	TX      *Tx
}

Connection represents all of the necessary details for talking with a datastore

func Connect 

func Connect(e string) (*Connection, error)

Connect takes the name of a connection, default is "development", and will return that connection from the available `Connections`. If a connection with that name can not be found an error will be returned. If a connection is found, and it has yet to open a connection with its underlying datastore, a connection to that store will be opened.

func NewConnection 

func NewConnection(deets *ConnectionDetails) (*Connection, error)

NewConnection creates a new connection, and sets it's `Dialect` appropriately based on the `ConnectionDetails` passed into it.

func (*Connection) All 

func (c *Connection) All(models interface{}) error

All retrieves all of the records in the database that match the query. 

c.All(&[]User{})

func (*Connection) BelongsTo 

func (c *Connection) BelongsTo(model interface{}) *Query

BelongsTo adds a "where" clause based on the "ID" of the "model" passed into it.

func (*Connection) BelongsToAs 

func (c *Connection) BelongsToAs(model interface{}, as string) *Query

BelongsToAs adds a "where" clause based on the "ID" of the "model" passed into it using an alias.

func (*Connection) BelongsToThrough 

func (c *Connection) BelongsToThrough(bt, thru interface{}) *Query

BelongsToThrough adds a "where" clause that connects the "bt" model through the associated "thru" model.

func (*Connection) Close 

func (c *Connection) Close() error

Close destroys an active datasource connection

func (*Connection) Count 

func (c *Connection) Count(model interface{}) (int, error)

Count the number of records in the database. 

c.Count(&User{})

func (*Connection) Create 

func (c *Connection) Create(model interface{}, excludeColumns ...string) error

Create add a new given entry to the database, excluding the given columns. It updates `created_at` and `updated_at` columns automatically.

func (*Connection) Destroy 

func (c *Connection) Destroy(model interface{}) error

Destroy deletes a given entry from the database

func (*Connection) Eager 

func (c *Connection) Eager(fields ...string) *Query

Eager will enable load associations of the model. by defaults loads all the associations on the model, but can take a variadic list of associations to load. 

c.Eager().Find(model, 1) // will load all associations for model.
c.Eager("Books").Find(model, 1) // will load only Book association for model.

func (*Connection) Find 

func (c *Connection) Find(model interface{}, id interface{}) error

Find the first record of the model in the database with a particular id. 

c.Find(&User{}, 1)

func (*Connection) First 

func (c *Connection) First(model interface{}) error

First record of the model in the database that matches the query. 

c.First(&User{})

func (*Connection) Last 

func (c *Connection) Last(model interface{}) error

Last record of the model in the database that matches the query. 

c.Last(&User{})

func (*Connection) Limit 

func (c *Connection) Limit(limit int) *Query

Limit will add a limit clause to the query.

func (*Connection) Load 

func (c *Connection) Load(model interface{}, fields ...string) error

Load loads all association or the fields specified in params for an already loaded model.

tx.First(&u) tx.Load(&u)

func (*Connection) MigrateDown 

func (c *Connection) MigrateDown(path string, step int) error

MigrateDown is deprecated, and will be removed in a future version. Use FileMigrator#Down instead.

func (*Connection) MigrateReset 

func (c *Connection) MigrateReset(path string) error

MigrateReset is deprecated, and will be removed in a future version. Use FileMigrator#Reset instead.

func (*Connection) MigrateStatus 

func (c *Connection) MigrateStatus(path string) error

MigrateStatus is deprecated, and will be removed in a future version. Use FileMigrator#Status instead.

func (*Connection) MigrateUp 

func (c *Connection) MigrateUp(path string) error

MigrateUp is deprecated, and will be removed in a future version. Use FileMigrator#Up instead.

func (*Connection) MigrationURL 

func (c *Connection) MigrationURL() string

MigrationURL returns the datasource connection string used for running the migrations

func (*Connection) NewTransaction 

func (c *Connection) NewTransaction() (*Connection, error)

NewTransaction starts a new transaction on the connection

func (*Connection) Open 

func (c *Connection) Open() error

Open creates a new datasource connection

func (*Connection) Order 

func (c *Connection) Order(stmt string) *Query

Order will append an order clause to the query. 

c.Order("name desc")

func (*Connection) Paginate 

func (c *Connection) Paginate(page int, perPage int) *Query

Paginate records returned from the database. 

q := c.Paginate(2, 15)
q.All(&[]User{})
q.Paginator

func (*Connection) PaginateFromParams 

func (c *Connection) PaginateFromParams(params PaginationParams) *Query

PaginateFromParams paginates records returned from the database. 

q := c.PaginateFromParams(req.URL.Query())
q.All(&[]User{})
q.Paginator

func (*Connection) Q 

func (c *Connection) Q() *Query

Q creates a new "empty" query for the current connection.

func (*Connection) RawQuery 

func (c *Connection) RawQuery(stmt string, args ...interface{}) *Query

RawQuery will override the query building feature of Pop and will use whatever query you want to execute against the `Connection`. You can continue to use the `?` argument syntax. 

c.RawQuery("select * from foo where id = ?", 1)

func (*Connection) Reload 

func (c *Connection) Reload(model interface{}) error

Reload fetch fresh data for a given model, using its ID

func (*Connection) Rollback 

func (c *Connection) Rollback(fn func(tx *Connection)) error

Rollback will open a new transaction and automatically rollback that transaction when the inner function returns, regardless. This can be useful for tests, etc...

func (*Connection) Save 

func (c *Connection) Save(model interface{}, excludeColumns ...string) error

Save wraps the Create and Update methods. It executes a Create if no ID is provided with the entry; or issues an Update otherwise.

func (*Connection) Scope 

func (c *Connection) Scope(sf ScopeFunc) *Query

Scope the query by using a `ScopeFunc` 

func ByName(name string) ScopeFunc {
	return func(q *Query) *Query {
		return q.Where("name = ?", name)
	}
}

c.Scope(ByName("mark")).First(&User{})

func (*Connection) String 

func (c *Connection) String() string

func (*Connection) Transaction 

func (c *Connection) Transaction(fn func(tx *Connection) error) error

Transaction will start a new transaction on the connection. If the inner function returns an error then the transaction will be rolled back, otherwise the transaction will automatically commit at the end.

func (*Connection) TruncateAll 

func (c *Connection) TruncateAll() error

TruncateAll truncates all data from the datasource

func (*Connection) URL 

func (c *Connection) URL() string

URL returns the datasource connection string

func (*Connection) Update 

func (c *Connection) Update(model interface{}, excludeColumns ...string) error

Update writes changes from an entry to the database, excluding the given columns. It updates the `updated_at` column automatically.

func (*Connection) ValidateAndCreate 

func (c *Connection) ValidateAndCreate(model interface{}, excludeColumns ...string) (*validate.Errors, error)

ValidateAndCreate applies validation rules on the given entry, then creates it if the validation succeed, excluding the given columns.

func (*Connection) ValidateAndSave 

func (c *Connection) ValidateAndSave(model interface{}, excludeColumns ...string) (*validate.Errors, error)

ValidateAndSave applies validation rules on the given entry, then save it if the validation succeed, excluding the given columns.

func (*Connection) ValidateAndUpdate 

func (c *Connection) ValidateAndUpdate(model interface{}, excludeColumns ...string) (*validate.Errors, error)

ValidateAndUpdate applies validation rules on the given entry, then update it if the validation succeed, excluding the given columns.

func (*Connection) Where 

func (c *Connection) Where(stmt string, args ...interface{}) *Query

Where will append a where clause to the query. You may use `?` in place of arguments. 

c.Where("id = ?", 1)
q.Where("id in (?)", 1, 2, 3)

type ConnectionDetails 

type ConnectionDetails struct {
	// Example: "postgres" or "sqlite3" or "mysql"
	Dialect string
	// The name of your database. Example: "foo_development"
	Database string
	// The host of your database. Example: "127.0.0.1"
	Host string
	// The port of your database. Example: 1234
	// Will default to the "default" port for each dialect.
	Port string
	// The username of the database user. Example: "root"
	User string
	// The password of the database user. Example: "password"
	Password string
	// Instead of specifying each individual piece of the
	// connection you can instead just specify the URL of the
	// database. Example: "postgres://postgres:postgres@localhost:5432/pop_test?sslmode=disable"
	URL string
	// Defaults to 0 "unlimited". See https://golang.org/pkg/database/sql/#DB.SetMaxOpenConns
	Pool    int
	Options map[string]string
}

ConnectionDetails stores the data needed to connect to a datasource

func (*ConnectionDetails) Finalize 

func (cd *ConnectionDetails) Finalize() error

Finalize cleans up the connection details by normalizing names, filling in default values, etc...

func (*ConnectionDetails) Parse 

func (cd *ConnectionDetails) Parse(port string) error

Parse is deprecated! Please use `ConnectionDetails.Finalize()` instead!

func (*ConnectionDetails) RetryLimit 

func (cd *ConnectionDetails) RetryLimit() int

RetryLimit returns the maximum number of accepted connection retries

func (*ConnectionDetails) RetrySleep 

func (cd *ConnectionDetails) RetrySleep() time.Duration

RetrySleep returns the amount of time to wait between two connection retries

type FileMigrator 

type FileMigrator struct {
	Migrator
	Path string
}

FileMigrator is a migrator for SQL and Fizz files on disk at a specified path.

func NewFileMigrator 

func NewFileMigrator(path string, c *Connection) (FileMigrator, error)

NewFileMigrator for a path and a Connection

type GroupClause 

type GroupClause struct {
	Field string
}

GroupClause holds the field to apply the GROUP clause on

func (GroupClause) String 

func (c GroupClause) String() string

type HavingClause 

type HavingClause struct {
	Condition string
	Arguments []interface{}
}

HavingClause defines a condition and its arguments for a HAVING clause

func (HavingClause) String 

func (c HavingClause) String() string

type Migration 

type Migration struct {
	// Path to the migration (./migrations/123_create_widgets.up.sql)
	Path string
	// Version of the migration (123)
	Version string
	// Name of the migration (create_widgets)
	Name string
	// Direction of the migration (up)
	Direction string
	// Type of migration (sql)
	Type string
	// Runner function to run/execute the migration
	Runner func(Migration, *Connection) error
}

Migration handles the data for a given database migration

func (Migration) Run 

func (mf Migration) Run(c *Connection) error

Run the migration. Returns an error if there is no mf.Runner defined.

type MigrationBox 

type MigrationBox struct {
	Migrator
	Box packr.Box
}

MigrationBox is a wrapper around packr.Box and Migrator. This will allow you to run migrations from a packed box inside of a compiled binary.

func NewMigrationBox 

func NewMigrationBox(box packr.Box, c *Connection) (MigrationBox, error)

NewMigrationBox from a packr.Box and a Connection.

type Migrations 

type Migrations []Migration

Migrations is a collection of Migration

func (Migrations) Len 

func (mfs Migrations) Len() int

func (Migrations) Less 

func (mfs Migrations) Less(i, j int) bool

func (Migrations) Swap 

func (mfs Migrations) Swap(i, j int)

type Migrator 

type Migrator struct {
	Connection *Connection
	SchemaPath string
	Migrations map[string]Migrations
}

Migrator forms the basis of all migrations systems. It does the actual heavy lifting of running migrations. When building a new migration system, you should embed this type into your migrator.

func NewMigrator 

func NewMigrator(c *Connection) Migrator

NewMigrator returns a new "blank" migrator. It is recommended to use something like MigrationBox or FileMigrator. A "blank" Migrator should only be used as the basis for a new type of migration system.

func (Migrator) CreateSchemaMigrations 

func (m Migrator) CreateSchemaMigrations() error

CreateSchemaMigrations sets up a table to track migrations. This is an idempotent operation.

func (Migrator) Down 

func (m Migrator) Down(step int) error

Down runs pending "down" migrations and rolls back the database by the specified number of steps.

func (Migrator) DumpMigrationSchema 

func (m Migrator) DumpMigrationSchema() error

DumpMigrationSchema will generate a file of the current database schema based on the value of Migrator.SchemaPath

func (Migrator) Reset 

func (m Migrator) Reset() error

Reset the database by runing the down migrations followed by the up migrations.

func (Migrator) Status 

func (m Migrator) Status() error

Status prints out the status of applied/pending migrations.

func (Migrator) Up 

func (m Migrator) Up() error

Up runs pending "up" migrations and applies them to the database.

type Model 

type Model struct {
	Value

	As string
	// contains filtered or unexported fields
}

Model is used throughout Pop to wrap the end user interface that is passed in to many functions.

func (*Model) ID 

func (m *Model) ID() interface{}

ID returns the ID of the Model. All models must have an `ID` field this is of type `int`,`int64` or of type `uuid.UUID`.

func (*Model) PrimaryKeyType 

func (m *Model) PrimaryKeyType() string

PrimaryKeyType gives the primary key type of the `Model`.

func (*Model) TableName 

func (m *Model) TableName() string

TableName returns the corresponding name of the underlying database table for a given `Model`. See also `TableNameAble` to change the default name of the table.

type PaginationParams 

type PaginationParams interface {
	Get(key string) string
}

PaginationParams is a parameters provider interface to get the pagination params from

type Paginator 

type Paginator struct {
	// Current page you're on
	Page int `json:"page"`
	// Number of results you want per page
	PerPage int `json:"per_page"`
	// Page * PerPage (ex: 2 * 20, Offset == 40)
	Offset int `json:"offset"`
	// Total potential records matching the query
	TotalEntriesSize int `json:"total_entries_size"`
	// Total records returns, will be <= PerPage
	CurrentEntriesSize int `json:"current_entries_size"`
	// Total pages
	TotalPages int `json:"total_pages"`
}

Paginator is a type used to represent the pagination of records from the database.

func NewPaginator 

func NewPaginator(page int, perPage int) *Paginator

NewPaginator returns a new `Paginator` value with the appropriate defaults set.

func NewPaginatorFromParams 

func NewPaginatorFromParams(params PaginationParams) *Paginator

NewPaginatorFromParams takes an interface of type `PaginationParams`, the `url.Values` type works great with this interface, and returns a new `Paginator` based on the params or `PaginatorPageKey` and `PaginatorPerPageKey`. Defaults are `1` for the page and PaginatorPerPageDefault for the per page value.

func (Paginator) String 

func (p Paginator) String() string

type Query 

type Query struct {
	RawSQL *clause

	Paginator  *Paginator
	Connection *Connection
	// contains filtered or unexported fields
}

Query is the main value that is used to build up a query to be executed against the `Connection`.

func Q 

func Q(c *Connection) *Query

Q will create a new "empty" query from the current connection.

func (*Query) All 

func (q *Query) All(models interface{}) error

All retrieves all of the records in the database that match the query. 

q.Where("name = ?", "mark").All(&[]User{})

func (*Query) BelongsTo 

func (q *Query) BelongsTo(model interface{}) *Query

BelongsTo adds a "where" clause based on the "ID" of the "model" passed into it.

func (*Query) BelongsToAs 

func (q *Query) BelongsToAs(model interface{}, as string) *Query

BelongsToAs adds a "where" clause based on the "ID" of the "model" passed into it, using an alias.

func (*Query) BelongsToThrough 

func (q *Query) BelongsToThrough(bt, thru interface{}) *Query

BelongsToThrough adds a "where" clause that connects the "bt" model through the associated "thru" model.

func (*Query) Clone 

func (q *Query) Clone(targetQ *Query)

func (Query) Count 

func (q Query) Count(model interface{}) (int, error)

Count the number of records in the database. 

q.Where("name = ?", "mark").Count(&User{})

func (Query) CountByField 

func (q Query) CountByField(model interface{}, field string) (int, error)

CountByField counts the number of records in the database, for a given field. 

q.Where("sex = ?", "f").Count(&User{}, "name")

func (*Query) Eager 

func (q *Query) Eager(fields ...string) *Query

Eager will enable load associations of the model. by defaults loads all the associations on the model, but can take a variadic list of associations to load. 

q.Eager().Find(model, 1) // will load all associations for model.
q.Eager("Books").Find(model, 1) // will load only Book association for model.

func (*Query) Exec 

func (q *Query) Exec() error

Exec runs the given query

func (*Query) ExecWithCount 

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

func (*Query) Exists 

func (q *Query) Exists(model interface{}) (bool, error)

Exists returns true/false if a record exists in the database that matches the query. 

q.Where("name = ?", "mark").Exists(&User{})

func (*Query) Find 

func (q *Query) Find(model interface{}, id interface{}) error

Find the first record of the model in the database with a particular id. 

q.Find(&User{}, 1)

func (*Query) First 

func (q *Query) First(model interface{}) error

First record of the model in the database that matches the query. 

q.Where("name = ?", "mark").First(&User{})

func (*Query) GroupBy 

func (q *Query) GroupBy(field string, fields ...string) *Query

GroupBy will append a GROUP BY clause to the query

func (*Query) Having 

func (q *Query) Having(condition string, args ...interface{}) *Query

Having will append a HAVING clause to the query

func (*Query) Join 

func (q *Query) Join(table string, on string, args ...interface{}) *Query

Join will append a JOIN clause to the query

func (*Query) Last 

func (q *Query) Last(model interface{}) error

Last record of the model in the database that matches the query. 

q.Where("name = ?", "mark").Last(&User{})

func (*Query) LeftInnerJoin 

func (q *Query) LeftInnerJoin(table string, on string, args ...interface{}) *Query

LeftInnerJoin will append a LEFT INNER JOIN clause to the query

func (*Query) LeftJoin 

func (q *Query) LeftJoin(table string, on string, args ...interface{}) *Query

LeftJoin will append a LEFT JOIN clause to the query

func (*Query) LeftOuterJoin 

func (q *Query) LeftOuterJoin(table string, on string, args ...interface{}) *Query

LeftOuterJoin will append a LEFT OUTER JOIN clause to the query

func (*Query) Limit 

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

Limit will add a limit clause to the query.

func (*Query) Order 

func (q *Query) Order(stmt string) *Query

Order will append an order clause to the query. 

q.Order("name desc")

func (*Query) Paginate 

func (q *Query) Paginate(page int, perPage int) *Query

Paginate records returned from the database. 

q = q.Paginate(2, 15)
q.All(&[]User{})
q.Paginator

func (*Query) PaginateFromParams 

func (q *Query) PaginateFromParams(params PaginationParams) *Query

PaginateFromParams paginates records returned from the database. 

q = q.PaginateFromParams(req.URL.Query())
q.All(&[]User{})
q.Paginator

func (*Query) RawQuery 

func (q *Query) RawQuery(stmt string, args ...interface{}) *Query

RawQuery will override the query building feature of Pop and will use whatever query you want to execute against the `Connection`. You can continue to use the `?` argument syntax. 

q.RawQuery("select * from foo where id = ?", 1)

func (*Query) RightInnerJoin 

func (q *Query) RightInnerJoin(table string, on string, args ...interface{}) *Query

RightInnerJoin will append a RIGHT INNER JOIN clause to the query

func (*Query) RightJoin 

func (q *Query) RightJoin(table string, on string, args ...interface{}) *Query

RightJoin will append a RIGHT JOIN clause to the query

func (*Query) RightOuterJoin 

func (q *Query) RightOuterJoin(table string, on string, args ...interface{}) *Query

RightOuterJoin will append a RIGHT OUTER JOIN clause to the query

func (*Query) Scope 

func (q *Query) Scope(sf ScopeFunc) *Query

Scope the query by using a `ScopeFunc` 

func ByName(name string) ScopeFunc {
	return func(q *Query) *Query {
		return q.Where("name = ?", name)
	}
}

q.Scope(ByName("mark").Where("id = ?", 1).First(&User{})

func (Query) ToSQL 

func (q Query) ToSQL(model *Model, addColumns ...string) (string, []interface{})

ToSQL will generate SQL and the appropriate arguments for that SQL from the `Model` passed in.

func (*Query) Where 

func (q *Query) Where(stmt string, args ...interface{}) *Query

Where will append a where clause to the query. You may use `?` in place of arguments. 

q.Where("id = ?", 1)
q.Where("id in (?)", 1, 2, 3)

type ScopeFunc 

type ScopeFunc func(q *Query) *Query

ScopeFunc applies a custom operation on a given `Query`

type TableNameAble 

type TableNameAble interface {
	TableName() string
}

TableNameAble interface allows for the customize table mapping between a name and the database. For example the value `User{}` will automatically map to "users". Implementing `TableNameAble` would allow this to change to be changed to whatever you would like.

type Tx 

type Tx struct {
	ID int
	*sqlx.Tx
}

func (*Tx) Close 

func (tx *Tx) Close() error

func (*Tx) Transaction 

func (tx *Tx) Transaction() (*Tx, error)

Transaction simply returns the current transaction, this is defined so it implements the `Store` interface.

type Value 

type Value interface{}

Value is the contents of a `Model`.

Source Files

View all Source files

Directories

Path Synopsis
translators
cmd
cmd/generate
cmd/schema

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.