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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package sql
import (
"context"
"database/sql"
"database/sql/driver"
"fmt"
"strings"
"github.com/facebook/ent/dialect"
)
// Driver is a dialect.Driver implementation for SQL based databases.
type Driver struct {
Conn
dialect string
}
// Open wraps the database/sql.Open method and returns a dialect.Driver that implements the an ent/dialect.Driver interface.
func Open(driver, source string) (*Driver, error) {
db, err := sql.Open(driver, source)
if err != nil {
return nil, err
}
return &Driver{Conn{db}, driver}, nil
}
// OpenDB wraps the given database/sql.DB method with a Driver.
func OpenDB(driver string, db *sql.DB) *Driver {
return &Driver{Conn{db}, driver}
}
// DB returns the underlying *sql.DB instance.
func (d Driver) DB() *sql.DB {
return d.ExecQuerier.(*sql.DB)
}
// Dialect implements the dialect.Dialect method.
func (d Driver) Dialect() string {
// If the underlying driver is wrapped with opencensus driver.
for _, name := range []string{dialect.MySQL, dialect.SQLite, dialect.Postgres} {
if strings.HasPrefix(d.dialect, name) {
return name
}
}
return d.dialect
}
// Tx starts and returns a transaction.
func (d *Driver) Tx(ctx context.Context) (dialect.Tx, error) {
return d.BeginTx(ctx, nil)
}
// BeginTx starts a transaction with options.
func (d *Driver) BeginTx(ctx context.Context, opts *TxOptions) (dialect.Tx, error) {
tx, err := d.DB().BeginTx(ctx, opts)
if err != nil {
return nil, err
}
return &Tx{
ExecQuerier: Conn{tx},
Tx: tx,
}, nil
}
// Close closes the underlying connection.
func (d *Driver) Close() error { return d.DB().Close() }
// Tx implements dialect.Tx interface.
type Tx struct {
dialect.ExecQuerier
driver.Tx
}
// ExecQuerier wraps the standard Exec and Query methods.
type ExecQuerier interface {
ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
}
// Conn implements dialect.ExecQuerier given ExecQuerier.
type Conn struct {
ExecQuerier
}
// Exec implements the dialect.Exec method.
func (c Conn) Exec(ctx context.Context, query string, args, v interface{}) error {
argv, ok := args.([]interface{})
if !ok {
return fmt.Errorf("dialect/sql: invalid type %T. expect []interface{} for args", v)
}
switch v := v.(type) {
case nil:
if _, err := c.ExecContext(ctx, query, argv...); err != nil {
return err
}
case *sql.Result:
res, err := c.ExecContext(ctx, query, argv...)
if err != nil {
return err
}
*v = res
default:
return fmt.Errorf("dialect/sql: invalid type %T. expect *sql.Result", v)
}
return nil
}
// Query implements the dialect.Query method.
func (c Conn) Query(ctx context.Context, query string, args, v interface{}) error {
vr, ok := v.(*Rows)
if !ok {
return fmt.Errorf("dialect/sql: invalid type %T. expect *sql.Rows", v)
}
argv, ok := args.([]interface{})
if !ok {
return fmt.Errorf("dialect/sql: invalid type %T. expect []interface{} for args", args)
}
rows, err := c.QueryContext(ctx, query, argv...)
if err != nil {
return err
}
*vr = Rows{rows}
return nil
}
var _ dialect.Driver = (*Driver)(nil)
type (
// Rows wraps the sql.Rows to avoid locks copy.
Rows struct{ *sql.Rows }
// Result is an alias to sql.Result.
Result = sql.Result
// NullBool is an alias to sql.NullBool.
NullBool = sql.NullBool
// NullInt64 is an alias to sql.NullInt64.
NullInt64 = sql.NullInt64
// NullString is an alias to sql.NullString.
NullString = sql.NullString
// NullFloat64 is an alias to sql.NullFloat64.
NullFloat64 = sql.NullFloat64
// NullTime represents a time.Time that may be null.
NullTime = sql.NullTime
// TxOptions holds the transaction options to be used in DB.BeginTx.
TxOptions = sql.TxOptions
)
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