sqlgen

package
v0.5.3 Latest Latest
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 Go to latest Published: Jan 15, 2020 License: MIT Imports: 14 Imported by: 0

Documentation

Overview

Example (TagOverride)

You can override how values are serialized via struct tags. The following tags are available:

string (encoding.TextMarshaler, encoding.TextUnmarshaler), binary (encoding.BinaryMarshaler, encoding.BinaryUnmarshaler, gogoproto.Marshaler, gogoproto.Unmarshaler), json (json.Marshaler, json.Unmarshaler). 

package main

import (
	"context"
	"fmt"
	"net"
	"reflect"

	"github.com/samsarahq/thunder/internal/testfixtures"
	"github.com/samsarahq/thunder/sqlgen"
	uuid "github.com/satori/go.uuid"
)

type UUID uuid.UUID

func (u UUID) MarshalBinary() ([]byte, error) {
	return u[:], nil
}

func (u *UUID) UnmarshalBinary(b []byte) error {
	copy(u[:], b)
	return nil
}

// You can override how values are serialized via struct tags. The following tags are available:
//
// string (encoding.TextMarshaler, encoding.TextUnmarshaler), binary (encoding.BinaryMarshaler,
// encoding.BinaryUnmarshaler, gogoproto.Marshaler, gogoproto.Unmarshaler), json (json.Marshaler,
// json.Unmarshaler).
func main() {
	testDb, _ := testfixtures.NewTestDatabase()
	defer testDb.Close()

	_, err := testDb.Exec(`
		CREATE TABLE users (
			uuid          BINARY(16) PRIMARY KEY,
			name          VARCHAR(255),
			ip            VARCHAR(255),
			configuration BLOB
		)
	`)
	if err != nil {
		panic(err)
	}

	ctx := context.TODO()

	type User struct {
		UUID          UUID `sql:"uuid,primary,binary"`
		Name          string
		IP            net.IP                 `sql:"ip,string"`
		Configuration map[string]interface{} `sql:"configuration,json"`
	}

	schema := sqlgen.NewSchema()
	schema.MustRegisterType("users", sqlgen.UniqueId, User{})

	db := sqlgen.NewDB(testDb.DB, schema)
	uuid := uuid.NewV4()

	initialUser := &User{
		UUID: UUID(uuid),             // => BINARY (via uuid.MarshalBinary())
		Name: "Jean",                 // => VARCHAR
		IP:   net.IPv4(127, 0, 0, 1), // => VARCHAR (via ip.MarshalText())
		Configuration: map[string]interface{}{ // => JSON (via json.Marshal(configuration))
			"darkmode": true,
		},
	}
	_, err = db.InsertRow(ctx, initialUser)
	if err != nil {
		panic(err)
	}

	user := &User{UUID: UUID(uuid)}
	err = db.QueryRow(ctx, &user, nil, nil)
	if err != nil {
		panic(err)
	}

	if reflect.DeepEqual(*user, *initialUser) {
		fmt.Println("They match!")
	}
}

Output:

They match!

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func CopySingletonSlice 

func CopySingletonSlice(result interface{}, rows []interface{}) error

func CopySlice 

func CopySlice(result interface{}, rows []interface{}) error

Types

type BaseSelectQuery 

type BaseSelectQuery struct {
	Table   *Table
	Filter  Filter
	Options *SelectOptions
}

func (*BaseSelectQuery) MakeSelectQuery 

func (b *BaseSelectQuery) MakeSelectQuery() (*SelectQuery, error)

type Column 

type Column struct {
	Name    string
	Primary bool

	Descriptor *fields.Descriptor

	Index []int
	Order int
}

type DB 

type DB struct {
	Conn   *sql.DB
	Schema *Schema
	// contains filtered or unexported fields
}

DB uses a *sql.DB connection that is established by its owner. DB assumes the database connection exists and is alive at all times during the lifecycle of the object.

func NewDB 

func NewDB(conn *sql.DB, schema *Schema) *DB

func (*DB) BaseQuery 

func (db *DB) BaseQuery(ctx context.Context, query *BaseSelectQuery) ([]interface{}, error)

func (*DB) Count added in v0.5.1 

func (db *DB) Count(ctx context.Context, model interface{}, filter Filter) (int64, error)

Count counts the number of relevant rows in a database, matching options in filter

model should be a pointer to a struct, for example: 

count, err := db.Count(ctx, &User{}, &res, Filter{})
if err != nil { ... }

func (*DB) DeleteRow 

func (db *DB) DeleteRow(ctx context.Context, row interface{}) error

DeleteRow deletes a single row from the database, identified by the row's primary key

row should be a pointer to a struct, for example: 

user := &User{Id; 10}
if err := db.DeleteRow(ctx, user); err != nil {

func (*DB) HasTx 

func (db *DB) HasTx(ctx context.Context) bool

HasTx returns whether the provided Context contains a transaction for this DB.

func (*DB) InsertRow 

func (db *DB) InsertRow(ctx context.Context, row interface{}) (sql.Result, error)

InsertRow inserts a single row into the database

row should be a pointer to a struct, for example: 

user := &User{Name: "foo"}
if err := db.InsertRow(ctx, user); err != nil {

func (*DB) Query 

func (db *DB) Query(ctx context.Context, result interface{}, filter Filter, options *SelectOptions) error

Query fetches a collection of rows from the database

result should be a pointer to a slice of pointers to structs, for example: 

var users []*User
if err := db.Query(ctx, &users, nil, nil); err != nil {

func (*DB) QueryExecer 

func (db *DB) QueryExecer(ctx context.Context) QueryExecer

func (*DB) QueryRow 

func (db *DB) QueryRow(ctx context.Context, result interface{}, filter Filter, options *SelectOptions) error

QueryRow fetches a single row from the database

result should be a pointer to a pointer to a struct, for example: 

var user *User
if err := db.Query(ctx, &user, Filter{"id": 10}, nil); err != nil {

func (*DB) UpdateRow 

func (db *DB) UpdateRow(ctx context.Context, row interface{}) error

UpdateRow updates a single row in the database, identified by the row's primary key

row should be a pointer to a struct, for example: 

user := &User{Id; 10, Name: "bar"}
if err := db.UpdateRow(ctx, user); err != nil {

func (*DB) UpsertRow 

func (db *DB) UpsertRow(ctx context.Context, row interface{}) (sql.Result, error)

UpsertRow inserts a single row into the database

row should be a pointer to a struct, for example: 

user := &User{Name: "foo"}
if err := db.UpsertRow(ctx, user); err != nil {

func (*DB) WithDynamicLimit added in v0.5.1 

func (db *DB) WithDynamicLimit(dynamicLimit DynamicLimit) (*DB, error)

WithDynamicLimit is similar to WithShardLimit except that it supports dynamically computing what filter to enforce as a limit, based on a user- provide callback. It may be used together with a shard limit.

func (*DB) WithExistingTx 

func (db *DB) WithExistingTx(ctx context.Context, tx *sql.Tx) (context.Context, error)

WithExistingTx returns a derived Context that contains the provided Tx. It is an error to invoke this method on a Context that already contains a transaction for this DB. On error WithExistingTx returns a non-nil Context, so that the caller can still easily use its Context (e.g., to log the error).

func (*DB) WithShardLimit added in v0.5.1 

func (db *DB) WithShardLimit(shardLimit Filter) (*DB, error)

WithShardLimit scopes the DB to only allow queries with the given key-value pairs. This means any query must include a filter for the key-value pairs in the limit, and any write must have columns including the specified key-value pairs.

func (*DB) WithTx 

func (db *DB) WithTx(ctx context.Context) (context.Context, *sql.Tx, error)

WithTx begins a transaction and returns a derived Context that contains that transaction. It also returns the transaction value itself, for the caller to manipulate (e.g., Commit). It is an error to invoke this method on a Context that already contains a transaction for this DB. On error WithTx returns a non-nil Context, so that the caller can still easily use its Context (e.g., to log the error).

type DeleteQuery 

type DeleteQuery struct {
	Table string
	Where *SimpleWhere
}

DeleteQuery represents a DELETE query

func (*DeleteQuery) ToSQL 

func (q *DeleteQuery) ToSQL() (string, []interface{})

ToSQL builds a parameterized DELETE FROM x WHERE a = ? AND b = ? statement

type DynamicLimit added in v0.5.1 

type DynamicLimit struct {
	GetLimitFilter        DynamicLimitFilterCallback
	ShouldContinueOnError DynamicLimitErrorCallback
}

DynamicLimit is used with WithDynamicLimit to register a dynamic limit on a Thunder DB.

A `DynamicLimit` consists of two callbacks, `GetLimitFilter`, and `ShouldContinueOnError`, both user-defined.

Before making an SQL query, a Thunder DB with a dynamic limit will call `GetLimitFilter` with the request context and the name of the table being queried. It will use the sqlgen filter returned by the function as the limit to check for against the current query. The underlying limit check is the same as that used in `WithShardLimit`.

If the limit check fails, Thunder will call `ShouldContinueOnError` with the resulting error object and the table name. If `ShouldContinueOnError` returns false, the query will fail. Otherwise, if the return value is true Thunder will still execute the query.

type DynamicLimitErrorCallback added in v0.5.1 

type DynamicLimitErrorCallback func(err error, table string) bool

type DynamicLimitFilterCallback added in v0.5.1 

type DynamicLimitFilterCallback func(context.Context, string) Filter

type ErrorWithQuery added in v0.5.1 

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

ErrorWithQuery is an error wrapper that includes the clause and arguments of a sqlgen query.

func (*ErrorWithQuery) Error added in v0.5.1 

func (e *ErrorWithQuery) Error() string

func (*ErrorWithQuery) Reason added in v0.5.1 

func (e *ErrorWithQuery) Reason() string

Reason returns a human-readable error message of the clause and args

func (*ErrorWithQuery) Unwrap added in v0.5.1 

func (e *ErrorWithQuery) Unwrap() error

Unwrap returns the error without the clause or arguments.

type Filter 

type Filter map[string]interface{}

type InsertQuery 

type InsertQuery struct {
	Table   string
	Columns []string
	Values  []interface{}
}

InsertQuery represents a INSERT query

func (*InsertQuery) ToSQL 

func (q *InsertQuery) ToSQL() (string, []interface{})

ToSQL builds a parameterized INSERT INTO x (a, b) VALUES (?, ?) statement

type NullBytes 

type NullBytes struct {
	Bytes []byte
	Valid bool
}

func (*NullBytes) Scan 

func (b *NullBytes) Scan(value interface{}) error

func (*NullBytes) Value 

func (b *NullBytes) Value() (driver.Value, error)

type PrimaryKeyType 

type PrimaryKeyType int
const (
	AutoIncrement PrimaryKeyType = iota
	UniqueId
)

type QueryExecer 

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

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

A QueryExecer is either a *sql.Tx or a *sql.DB.

type SQLQuery 

type SQLQuery interface {
	ToSQL() (string, []interface{})
}

type Schema 

type Schema struct {
	ByName map[string]*Table
	ByType map[reflect.Type]*Table
}

func NewSchema 

func NewSchema() *Schema

func (*Schema) BuildStruct added in v0.5.0 

func (s *Schema) BuildStruct(tableName string, row []driver.Value) (interface{}, error)

BuildStruct scans a row in struct's column order into a struct pointer.

func (*Schema) MakeDeleteRow 

func (s *Schema) MakeDeleteRow(row interface{}) (*DeleteQuery, error)

MakeDeleteRow builds a new DeleteQuery to delete row

func (*Schema) MakeInsertRow 

func (s *Schema) MakeInsertRow(row interface{}) (*InsertQuery, error)

MakeInsertRow builds a new InsertQuery to insert row

func (*Schema) MakeSelect 

func (s *Schema) MakeSelect(result interface{}, filter Filter, options *SelectOptions) (*BaseSelectQuery, error)

func (*Schema) MakeSelectRow 

func (s *Schema) MakeSelectRow(result interface{}, filter Filter, options *SelectOptions) (*BaseSelectQuery, error)

func (*Schema) MakeTester 

func (s *Schema) MakeTester(table string, filter Filter) (Tester, error)

func (*Schema) MakeUpdateRow 

func (s *Schema) MakeUpdateRow(row interface{}) (*UpdateQuery, error)

MakeUpdateRow builds a new UpdateQuery to update row

func (*Schema) MakeUpsertRow 

func (s *Schema) MakeUpsertRow(row interface{}) (*UpsertQuery, error)

MakeUpsertRow builds a new UpsertQuery to upsqrt row

func (*Schema) MustRegisterType 

func (s *Schema) MustRegisterType(table string, primaryKeyType PrimaryKeyType, value interface{})

func (*Schema) ParseRows 

func (s *Schema) ParseRows(query *SelectQuery, res *sql.Rows) ([]interface{}, error)

func (*Schema) RegisterType 

func (s *Schema) RegisterType(table string, primaryKeyType PrimaryKeyType, value interface{}) error

func (*Schema) UnbuildStruct added in v0.5.0 

func (s *Schema) UnbuildStruct(tableName string, strct interface{}) ([]interface{}, error)

UnbuildStruct extracts SQL values from a struct.

type SelectOptions 

type SelectOptions struct {
	Where  string
	Values []interface{}

	OrderBy string
	Limit   int
}

func (*SelectOptions) IncludeFilter 

func (s *SelectOptions) IncludeFilter(table *Table, filter Filter) error

type SelectQuery 

type SelectQuery struct {
	Table   string
	Columns []string

	Options *SelectOptions
}

SelectQuery represents a SELECT query

func (*SelectQuery) ToSQL 

func (q *SelectQuery) ToSQL() (string, []interface{})

ToSQL builds a parameterized SELECT a, b, c FROM x ... statement

type SimpleWhere 

type SimpleWhere struct {
	Columns []string
	Values  []interface{}
}

SimpleWhere represents a simple WHERE clause

func (*SimpleWhere) ToSQL 

func (w *SimpleWhere) ToSQL() (string, []interface{})

ToSQL builds a `a = ? AND b = ?` clause

type Table 

type Table struct {
	Name           string
	Type           reflect.Type
	PrimaryKeyType PrimaryKeyType

	Columns       []*Column
	ColumnsByName map[string]*Column

	Scanners *sync.Pool
}

type Tester 

type Tester interface {
	Test(row interface{}) bool
}

type UpdateQuery 

type UpdateQuery struct {
	Table   string
	Columns []string
	Values  []interface{}
	Where   *SimpleWhere
}

UpdateQuery represents a UPDATE query

func (*UpdateQuery) ToSQL 

func (q *UpdateQuery) ToSQL() (string, []interface{})

ToSQL builds a parameterized UPDATE x SET a = ?, b = ? WHERE c = ? statement

type UpsertQuery 

type UpsertQuery struct {
	Table   string
	Columns []string
	Values  []interface{}
}

UpsertQuery represents a INSERT ... ON DUPLICATE KEY UPDATE query

func (*UpsertQuery) ToSQL 

func (q *UpsertQuery) ToSQL() (string, []interface{})

ToSQL builds a parameterized INSERT INTO x (a, b) VALUES (?, ?) statement

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