schema

package
v0.1.0 Latest Latest
Warning

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

 Go to latest Published: Oct 31, 2026 License: MIT Imports: 7 Imported by: 0

Documentation

Overview

Package schema is a Laravel-style schema builder: you describe tables with a Blueprint, and a Grammar turns that description into DDL for the target database. Application code never writes SQL.

Index

Constants

View Source 
const (
	TypeBigInteger   = "bigInteger"
	TypeInteger      = "integer"
	TypeSmallInteger = "smallInteger"
	TypeString       = "string"
	TypeText         = "text"
	TypeBoolean      = "boolean"
	TypeDecimal      = "decimal"
	TypeFloat        = "float"
	TypeDouble       = "double"
	TypeDate         = "date"
	TypeDateTime     = "dateTime"
	TypeTimestamp    = "timestamp"
	TypeJSON         = "json"
	TypeUUID         = "uuid"
	TypeBinary       = "binary"
	TypeEnum         = "enum"
)

Column type names.

Variables

View Source 
var ErrUnsupported = errors.New("schema: operation not supported by this database")

ErrUnsupported is returned when the target database cannot perform an operation (for example dropping a foreign key on SQLite).

Functions

func ToAlterSQL 

func ToAlterSQL(g Grammar, table string, fn func(t *Blueprint)) ([]string, error)

ToAlterSQL compiles a Table (alter) blueprint without executing it.

func ToSQL 

func ToSQL(g Grammar, table string, fn func(t *Blueprint)) ([]string, error)

ToSQL compiles a Create blueprint without executing it. Handy for tests and documentation.

Types

type Blueprint 

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

Blueprint collects the definition of one table.

func (*Blueprint) BigIncrements 

func (b *Blueprint) BigIncrements(name string) *Column

BigIncrements adds an auto-incrementing BIGINT primary key.

func (*Blueprint) BigInteger 

func (b *Blueprint) BigInteger(name string) *Column

BigInteger adds a BIGINT column.

func (*Blueprint) Binary 

func (b *Blueprint) Binary(name string) *Column

Binary adds a binary (BLOB/BYTEA) column.

func (*Blueprint) Boolean 

func (b *Blueprint) Boolean(name string) *Column

Boolean adds a boolean column.

func (*Blueprint) Date 

func (b *Blueprint) Date(name string) *Column

Date adds a DATE column.

func (*Blueprint) DateTime 

func (b *Blueprint) DateTime(name string) *Column

DateTime adds a DATETIME column.

func (*Blueprint) Decimal 

func (b *Blueprint) Decimal(name string, precisionScale ...int) *Column

Decimal adds a DECIMAL column. Optional arguments: precision, scale (default 8, 2).

func (*Blueprint) Double 

func (b *Blueprint) Double(name string) *Column

Double adds a double-precision float column.

func (*Blueprint) DropColumn 

func (b *Blueprint) DropColumn(names ...string)

DropColumn drops columns.

func (*Blueprint) DropForeign 

func (b *Blueprint) DropForeign(cols ...string)

DropForeign drops the foreign key created over cols.

func (*Blueprint) DropForeignNamed 

func (b *Blueprint) DropForeignNamed(name string)

DropForeignNamed drops a foreign key by its exact name.

func (*Blueprint) DropIndex 

func (b *Blueprint) DropIndex(cols ...string)

DropIndex drops the plain index created over cols.

func (*Blueprint) DropIndexNamed 

func (b *Blueprint) DropIndexNamed(name string)

DropIndexNamed drops an index by its exact name.

func (*Blueprint) DropUnique 

func (b *Blueprint) DropUnique(cols ...string)

DropUnique drops the unique index created over cols.

func (*Blueprint) Enum 

func (b *Blueprint) Enum(name string, allowed ...string) *Column

Enum adds a column restricted to the allowed values.

func (*Blueprint) Float 

func (b *Blueprint) Float(name string) *Column

Float adds a single-precision float column.

func (*Blueprint) Foreign 

func (b *Blueprint) Foreign(cols ...string) *ForeignKey

Foreign starts a foreign-key definition on cols.

func (*Blueprint) ForeignID 

func (b *Blueprint) ForeignID(name string) *ForeignIDColumn

ForeignID adds a BIGINT UNSIGNED column intended as a foreign key. 

t.ForeignID("user_id").Constrained().CascadeOnDelete()

func (*Blueprint) ID 

func (b *Blueprint) ID(name ...string) *Column

ID adds an auto-incrementing BIGINT UNSIGNED primary key (default name "id").

func (*Blueprint) Increments 

func (b *Blueprint) Increments(name string) *Column

Increments adds an auto-incrementing INTEGER primary key.

func (*Blueprint) Index 

func (b *Blueprint) Index(cols ...string) *Index

Index adds an index over cols.

func (*Blueprint) Integer 

func (b *Blueprint) Integer(name string) *Column

Integer adds an INTEGER column.

func (*Blueprint) JSON 

func (b *Blueprint) JSON(name string) *Column

JSON adds a JSON column (JSONB on PostgreSQL, TEXT on SQLite).

func (*Blueprint) Primary 

func (b *Blueprint) Primary(cols ...string)

Primary declares a (composite) primary key over cols.

func (*Blueprint) RememberToken 

func (b *Blueprint) RememberToken() *Column

RememberToken adds a nullable remember_token VARCHAR(100).

func (*Blueprint) RenameColumn 

func (b *Blueprint) RenameColumn(from, to string)

RenameColumn renames a column.

func (*Blueprint) SmallInteger 

func (b *Blueprint) SmallInteger(name string) *Column

SmallInteger adds a SMALLINT column.

func (*Blueprint) SoftDeletes 

func (b *Blueprint) SoftDeletes() *Column

SoftDeletes adds a nullable deleted_at column.

func (*Blueprint) String 

func (b *Blueprint) String(name string, length ...int) *Column

String adds a VARCHAR column (default length 255).

func (*Blueprint) Table 

func (b *Blueprint) Table() string

Table returns the table name.

func (*Blueprint) Text 

func (b *Blueprint) Text(name string) *Column

Text adds a TEXT column.

func (*Blueprint) Timestamp 

func (b *Blueprint) Timestamp(name string) *Column

Timestamp adds a TIMESTAMP column.

func (*Blueprint) Timestamps 

func (b *Blueprint) Timestamps()

Timestamps adds nullable created_at and updated_at columns.

func (*Blueprint) UUID 

func (b *Blueprint) UUID(name string) *Column

UUID adds a UUID column.

func (*Blueprint) Unique 

func (b *Blueprint) Unique(cols ...string) *Index

Unique adds a unique index over cols.

type Builder 

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

Builder is what migrations receive. It runs the DDL produced by a Grammar. 

s.Create("users", func(t *schema.Blueprint) { t.ID(); t.String("email").Unique() })

func NewBuilder 

func NewBuilder(ctx context.Context, conn Conn, g Grammar) *Builder

NewBuilder creates a Builder that executes on conn.

func NewPretendBuilder 

func NewPretendBuilder(ctx context.Context, g Grammar, log func(stmt string)) *Builder

NewPretendBuilder creates a Builder that never touches a database: every statement it would run is passed to log instead. Used by "migrate --pretend".

func (*Builder) Context 

func (b *Builder) Context() context.Context

Context returns the context of the running migration.

func (*Builder) Create 

func (b *Builder) Create(table string, fn func(t *Blueprint)) error

Create creates a table.

func (*Builder) Drop 

func (b *Builder) Drop(table string) error

Drop drops a table; it fails if the table does not exist.

func (*Builder) DropAllTables 

func (b *Builder) DropAllTables() error

DropAllTables drops every table in the current database. Pass a *sql.Conn (not a pooled *sql.DB) so that session settings such as FOREIGN_KEY_CHECKS apply to all statements.

func (*Builder) DropIfExists 

func (b *Builder) DropIfExists(table string) error

DropIfExists drops a table if it exists.

func (*Builder) Grammar 

func (b *Builder) Grammar() Grammar

Grammar returns the active grammar.

func (*Builder) HasColumn 

func (b *Builder) HasColumn(table, column string) (bool, error)

HasColumn reports whether the column exists. In pretend mode it returns false.

func (*Builder) HasTable 

func (b *Builder) HasTable(table string) (bool, error)

HasTable reports whether the table exists. In pretend mode it returns false.

func (*Builder) Rename 

func (b *Builder) Rename(from, to string) error

Rename renames a table.

func (*Builder) Table 

func (b *Builder) Table(table string, fn func(t *Blueprint)) error

Table alters an existing table.

type Column 

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

Column describes one column. Instances are created by Blueprint methods and refined with the fluent modifiers below.

func (*Column) AutoIncrement 

func (c *Column) AutoIncrement() *Column

AutoIncrement makes an integer column auto-increment.

func (*Column) Comment 

func (c *Column) Comment(s string) *Column

Comment attaches a comment (MySQL and PostgreSQL; ignored by SQLite).

func (*Column) Default 

func (c *Column) Default(v any) *Column

Default sets the default value. Accepts strings, numbers, bools, nil, time.Time and schema.Raw.

func (*Column) Index 

func (c *Column) Index() *Column

Index adds a plain index on this column.

func (*Column) Name 

func (c *Column) Name() string

Name returns the column name.

func (*Column) Nullable 

func (c *Column) Nullable(v ...bool) *Column

Nullable allows NULL. Columns are NOT NULL by default. Nullable(false) restores the default.

func (*Column) Primary 

func (c *Column) Primary() *Column

Primary marks the column as (part of) the primary key.

func (*Column) Unique 

func (c *Column) Unique() *Column

Unique adds a unique index on this column.

func (*Column) Unsigned 

func (c *Column) Unsigned() *Column

Unsigned marks an integer column unsigned (MySQL only; ignored elsewhere).

func (*Column) UseCurrent 

func (c *Column) UseCurrent() *Column

UseCurrent makes the default the current timestamp.

type Conn 

type Conn interface {
	ExecContext(ctx context.Context, query string, args ...any) (sql.Result, error)
	QueryContext(ctx context.Context, query string, args ...any) (*sql.Rows, error)
	QueryRowContext(ctx context.Context, query string, args ...any) *sql.Row
}

Conn is the subset of *sql.DB, *sql.Tx and *sql.Conn that Builder needs.

type ForeignIDColumn 

type ForeignIDColumn struct {
	*Column
	// contains filtered or unexported fields
}

ForeignIDColumn is a BIGINT UNSIGNED column that can be turned into a foreign key in one call.

func (*ForeignIDColumn) Constrained 

func (c *ForeignIDColumn) Constrained(table ...string) *ForeignKey

Constrained adds a foreign key to table (default: the column name without "_id", plus "s", so user_id -> users) referencing its id column.

func (*ForeignIDColumn) Nullable 

func (c *ForeignIDColumn) Nullable(v ...bool) *ForeignIDColumn

Nullable allows NULL and keeps the chain on ForeignIDColumn.

type ForeignKey 

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

ForeignKey describes a foreign-key constraint.

func (*ForeignKey) CascadeOnDelete 

func (f *ForeignKey) CascadeOnDelete() *ForeignKey

CascadeOnDelete is shorthand for OnDelete("cascade").

func (*ForeignKey) Named 

func (f *ForeignKey) Named(name string) *ForeignKey

Named overrides the generated constraint name.

func (*ForeignKey) NullOnDelete 

func (f *ForeignKey) NullOnDelete() *ForeignKey

NullOnDelete is shorthand for OnDelete("set null").

func (*ForeignKey) On 

func (f *ForeignKey) On(table string) *ForeignKey

On sets the referenced table.

func (*ForeignKey) OnDelete 

func (f *ForeignKey) OnDelete(action string) *ForeignKey

OnDelete sets the ON DELETE action: cascade, restrict, set null, no action or set default.

func (*ForeignKey) OnUpdate 

func (f *ForeignKey) OnUpdate(action string) *ForeignKey

OnUpdate sets the ON UPDATE action (same values as OnDelete).

func (*ForeignKey) References 

func (f *ForeignKey) References(cols ...string) *ForeignKey

References sets the referenced columns (default: id).

func (*ForeignKey) RestrictOnDelete 

func (f *ForeignKey) RestrictOnDelete() *ForeignKey

RestrictOnDelete is shorthand for OnDelete("restrict").

type Grammar 

type Grammar interface {
	// Name is the canonical driver name: postgres, mysql or sqlite.
	Name() string
	CompileCreate(bp *Blueprint) ([]string, error)
	CompileAlter(bp *Blueprint) ([]string, error)
	CompileDrop(table string) string
	CompileDropIfExists(table string) string
	CompileRename(from, to string) string
	CompileHasTable(table string) (string, []any)
	CompileHasColumn(table, column string) (string, []any)
	CompileListTables() string
	CompileDropAll(tables []string) []string
}

Grammar turns a Blueprint into DDL for one database. It is the only place in dbkit where SQL text is produced. Implement it to add a new database.

func GrammarFor 

func GrammarFor(driver string) (Grammar, error)

GrammarFor returns the Grammar for a driver name. Aliases such as pgx, postgresql, mariadb and sqlite3 are accepted.

type Index 

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

Index is a (non-primary) index or a primary-key declaration.

func (*Index) Named 

func (i *Index) Named(name string) *Index

Named overrides the generated index name.

type MySQL 

type MySQL struct{}

MySQL compiles DDL for MySQL 8+ and MariaDB.

func (MySQL) CompileAlter 

func (g MySQL) CompileAlter(bp *Blueprint) ([]string, error)

func (MySQL) CompileCreate 

func (g MySQL) CompileCreate(bp *Blueprint) ([]string, error)

func (MySQL) CompileDrop 

func (MySQL) CompileDrop(table string) string

func (MySQL) CompileDropAll 

func (MySQL) CompileDropAll(tables []string) []string

func (MySQL) CompileDropIfExists 

func (MySQL) CompileDropIfExists(table string) string

func (MySQL) CompileHasColumn 

func (MySQL) CompileHasColumn(table, column string) (string, []any)

func (MySQL) CompileHasTable 

func (MySQL) CompileHasTable(table string) (string, []any)

func (MySQL) CompileListTables 

func (MySQL) CompileListTables() string

func (MySQL) CompileRename 

func (MySQL) CompileRename(from, to string) string

func (MySQL) Name 

func (MySQL) Name() string

type Postgres 

type Postgres struct{}

Postgres compiles DDL for PostgreSQL.

func (Postgres) CompileAlter 

func (g Postgres) CompileAlter(bp *Blueprint) ([]string, error)

func (Postgres) CompileCreate 

func (g Postgres) CompileCreate(bp *Blueprint) ([]string, error)

func (Postgres) CompileDrop 

func (Postgres) CompileDrop(table string) string

func (Postgres) CompileDropAll 

func (Postgres) CompileDropAll(tables []string) []string

func (Postgres) CompileDropIfExists 

func (Postgres) CompileDropIfExists(table string) string

func (Postgres) CompileHasColumn 

func (Postgres) CompileHasColumn(table, column string) (string, []any)

func (Postgres) CompileHasTable 

func (Postgres) CompileHasTable(table string) (string, []any)

func (Postgres) CompileListTables 

func (Postgres) CompileListTables() string

func (Postgres) CompileRename 

func (Postgres) CompileRename(from, to string) string

func (Postgres) Name 

func (Postgres) Name() string

type Raw 

type Raw string

Raw is a value written into the DDL verbatim (for example a function call used as a column default). Use it sparingly and never with user input. 

t.Timestamp("seen_at").Default(schema.Raw("CURRENT_TIMESTAMP"))

type SQLite 

type SQLite struct{}

SQLite compiles DDL for SQLite 3.35+.

SQLite cannot add or drop foreign keys or primary keys on an existing table; those operations return ErrUnsupported. Declare them in Create.

func (SQLite) CompileAlter 

func (g SQLite) CompileAlter(bp *Blueprint) ([]string, error)

func (SQLite) CompileCreate 

func (g SQLite) CompileCreate(bp *Blueprint) ([]string, error)

func (SQLite) CompileDrop 

func (SQLite) CompileDrop(table string) string

func (SQLite) CompileDropAll 

func (SQLite) CompileDropAll(tables []string) []string

func (SQLite) CompileDropIfExists 

func (SQLite) CompileDropIfExists(table string) string

func (SQLite) CompileHasColumn 

func (SQLite) CompileHasColumn(table, column string) (string, []any)

func (SQLite) CompileHasTable 

func (SQLite) CompileHasTable(table string) (string, []any)

func (SQLite) CompileListTables 

func (SQLite) CompileListTables() string

func (SQLite) CompileRename 

func (SQLite) CompileRename(from, to string) string

func (SQLite) Name 

func (SQLite) Name() string

Source Files

View all Source files

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.