feat: add batch insert

sqlxx/batch/.snapshots/Test_buildInsertQueryArgs-case=cockroach.json

@@ -0,0 +1,14 @@
+{
+  "TableName": "\"test_models\"",
+  "ColumnsDecl": "\"created_at\", \"id\", \"int\", \"nid\", \"null_time_ptr\", \"string\", \"updated_at\"",
+  "Columns": [
+    "created_at",
+    "id",
+    "int",
+    "nid",
+    "null_time_ptr",
+    "string",
+    "updated_at"
+  ],
+  "Placeholders": "(?, ?, ?, ?, ?, ?, ?),\n(?, gen_random_uuid(), ?, ?, ?, ?, ?),\n(?, gen_random_uuid(), ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, gen_random_uuid(), ?, ?, ?, ?, ?),\n(?, gen_random_uuid(), ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, gen_random_uuid(), ?, ?, ?, ?, ?),\n(?, gen_random_uuid(), ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?)"
+}

sqlxx/batch/.snapshots/Test_buildInsertQueryArgs-case=testModel.json

@@ -0,0 +1,14 @@
+{
+  "TableName": "\"test_models\"",
+  "ColumnsDecl": "\"created_at\", \"id\", \"int\", \"nid\", \"null_time_ptr\", \"string\", \"updated_at\"",
+  "Columns": [
+    "created_at",
+    "id",
+    "int",
+    "nid",
+    "null_time_ptr",
+    "string",
+    "updated_at"
+  ],
+  "Placeholders": "(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?),\n(?, ?, ?, ?, ?, ?, ?)"
+}

sqlxx/batch/.snapshots/Test_buildInsertQueryValues-case=testModel-case=cockroach.json

@@ -0,0 +1,16 @@
+[
+  "0001-01-01T00:00:00Z",
+  "0001-01-01T00:00:00Z",
+  "string",
+  42,
+  null,
+  {
+    "ID": "00000000-0000-0000-0000-000000000000",
+    "NID": "00000000-0000-0000-0000-000000000000",
+    "String": "string",
+    "Int": 42,
+    "NullTimePtr": null,
+    "created_at": "0001-01-01T00:00:00Z",
+    "updated_at": "0001-01-01T00:00:00Z"
+  }
+]

sqlxx/batch/create.go

@@ -0,0 +1,275 @@
+// Copyright © 2023 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package batch
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"reflect"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/jmoiron/sqlx/reflectx"
+
+	"github.com/ory/x/dbal"
+
+	"github.com/gobuffalo/pop/v6"
+	"github.com/gofrs/uuid"
+	"github.com/pkg/errors"
+
+	"github.com/ory/x/otelx"
+	"github.com/ory/x/sqlcon"
+
+	"github.com/ory/x/sqlxx"
+)
+
+type (
+	insertQueryArgs struct {
+		TableName    string
+		ColumnsDecl  string
+		Columns      []string
+		Placeholders string
+	}
+	quoter interface {
+		Quote(key string) string
+	}
+	TracerConnection struct {
+		Tracer     *otelx.Tracer
+		Connection *pop.Connection
+	}
+)
+
+func buildInsertQueryArgs[T any](ctx context.Context, dialect string, mapper *reflectx.Mapper, quoter quoter, models []*T) insertQueryArgs {
+	var (
+		v     T
+		model = pop.NewModel(v, ctx)
+
+		columns        []string
+		quotedColumns  []string
+		placeholders   []string
+		placeholderRow []string
+	)
+
+	for _, col := range model.Columns().Cols {
+		columns = append(columns, col.Name)
+		placeholderRow = append(placeholderRow, "?")
+	}
+
+	// We sort for the sole reason that the test snapshots are deterministic.
+	sort.Strings(columns)
+
+	for _, col := range columns {
+		quotedColumns = append(quotedColumns, quoter.Quote(col))
+	}
+
+	// We generate a list (for every row one) of VALUE statements here that
+	// will be substituted by their column values later:
+	//
+	//	(?, ?, ?, ?),
+	//	(?, ?, ?, ?),
+	//	(?, ?, ?, ?)
+	for _, m := range models {
+		m := reflect.ValueOf(m)
+
+		pl := make([]string, len(placeholderRow))
+		copy(pl, placeholderRow)
+
+		// There is a special case - when using CockroachDB we want to generate
+		// UUIDs using "gen_random_uuid()" which ends up in a VALUE statement of:
+		//
+		//	(gen_random_uuid(), ?, ?, ?),
+		for k := range placeholderRow {
+			if columns[k] != "id" {
+				continue
+			}
+
+			field := mapper.FieldByName(m, columns[k])
+			val, ok := field.Interface().(uuid.UUID)
+			if !ok {
+				continue
+			}
+
+			if val == uuid.Nil && dialect == dbal.DriverCockroachDB {
+				pl[k] = "gen_random_uuid()"
+				break
+			}
+		}
+
+		placeholders = append(placeholders, fmt.Sprintf("(%s)", strings.Join(pl, ", ")))
+	}
+
+	return insertQueryArgs{
+		TableName:    quoter.Quote(model.TableName()),
+		ColumnsDecl:  strings.Join(quotedColumns, ", "),
+		Columns:      columns,
+		Placeholders: strings.Join(placeholders, ",\n"),
+	}
+}
+
+func buildInsertQueryValues[T any](dialect string, mapper *reflectx.Mapper, columns []string, models []*T, nowFunc func() time.Time) (values []any, err error) {
+	for _, m := range models {
+		m := reflect.ValueOf(m)
+
+		now := nowFunc()
+		// Append model fields to args
+		for _, c := range columns {
+			field := mapper.FieldByName(m, c)
+
+			switch c {
+			case "created_at":
+				if pop.IsZeroOfUnderlyingType(field.Interface()) {
+					field.Set(reflect.ValueOf(now))
+				}
+			case "updated_at":
+				field.Set(reflect.ValueOf(now))
+			case "id":
+				if field.Interface().(uuid.UUID) != uuid.Nil {
+					break // breaks switch, not for
+				} else if dialect == dbal.DriverCockroachDB {
+					// This is a special case:
+					// 1. We're using cockroach
+					// 2. It's the primary key field ("ID")
+					// 3. A UUID was not yet set.
+					//
+					// If all these conditions meet, the VALUE statement will look as such:
+					//
+					//	(gen_random_uuid(), ?, ?, ?, ...)
+					//
+					// For that reason, we do not add the ID value to the list of arguments,
+					// because one of the arguments is using a built-in and thus doesn't need a value.
+					continue // break switch, not for
+				}
+
+				id, err := uuid.NewV4()
+				if err != nil {
+					return nil, err
+				}
+				field.Set(reflect.ValueOf(id))
+			}
+
+			values = append(values, field.Interface())
+
+			// Special-handling for *sqlxx.NullTime: mapper.FieldByName sets this to a zero time.Time,
+			// but we want a nil pointer instead.
+			if i, ok := field.Interface().(*sqlxx.NullTime); ok {
+				if time.Time(*i).IsZero() {
+					field.Set(reflect.Zero(field.Type()))
+				}
+			}
+		}
+	}
+
+	return values, nil
+}
+
+// Create batch-inserts the given models into the database using a single INSERT statement.
+// The models are either all created or none.
+func Create[T any](ctx context.Context, p *TracerConnection, models []*T) (err error) {
+	ctx, span := p.Tracer.Tracer().Start(ctx, "persistence.sql.batch.Create")
+	defer otelx.End(span, &err)
+
+	if len(models) == 0 {
+		return nil
+	}
+
+	var v T
+	model := pop.NewModel(v, ctx)
+
+	conn := p.Connection
+	quoter, ok := conn.Dialect.(quoter)
+	if !ok {
+		return errors.Errorf("store is not a quoter: %T", conn.Store)
+	}
+
+	queryArgs := buildInsertQueryArgs(ctx, conn.Dialect.Name(), conn.TX.Mapper, quoter, models)
+	values, err := buildInsertQueryValues(conn.Dialect.Name(), conn.TX.Mapper, queryArgs.Columns, models, func() time.Time { return time.Now().UTC().Truncate(time.Microsecond) })
+	if err != nil {
+		return err
+	}
+
+	var returningClause string
+	if conn.Dialect.Name() != dbal.DriverMySQL {
+		// PostgreSQL, CockroachDB, SQLite support RETURNING.
+		returningClause = fmt.Sprintf("RETURNING %s", model.IDField())
+	}
+
+	query := conn.Dialect.TranslateSQL(fmt.Sprintf(
+		"INSERT INTO %s (%s) VALUES\n%s\n%s",
+		queryArgs.TableName,
+		queryArgs.ColumnsDecl,
+		queryArgs.Placeholders,
+		returningClause,
+	))
+
+	rows, err := conn.TX.QueryContext(ctx, query, values...)
+	if err != nil {
+		return sqlcon.HandleError(err)
+	}
+	defer rows.Close()
+
+	// Hydrate the models from the RETURNING clause.
+	//
+	// Databases not supporting RETURNING will just return 0 rows.
+	count := 0
+	for rows.Next() {
+		if err := rows.Err(); err != nil {
+			return sqlcon.HandleError(err)
+		}
+
+		if err := setModelID(rows, pop.NewModel(models[count], ctx)); err != nil {
+			return err
+		}
+		count++
+	}
+
+	if err := rows.Err(); err != nil {
+		return sqlcon.HandleError(err)
+	}
+
+	if err := rows.Close(); err != nil {
+		return sqlcon.HandleError(err)
+	}
+
+	return sqlcon.HandleError(err)
+}
+
+// setModelID was copy & pasted from pop. It basically sets
+// the primary key to the given value read from the SQL row.
+func setModelID(row *sql.Rows, model *pop.Model) error {
+	el := reflect.ValueOf(model.Value).Elem()
+	fbn := el.FieldByName("ID")
+	if !fbn.IsValid() {
+		return errors.New("model does not have a field named id")
+	}
+
+	pkt, err := model.PrimaryKeyType()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	switch pkt {
+	case "UUID":
+		var id uuid.UUID
+		if err := row.Scan(&id); err != nil {
+			return errors.WithStack(err)
+		}
+		fbn.Set(reflect.ValueOf(id))
+	default:
+		var id interface{}
+		if err := row.Scan(&id); err != nil {
+			return errors.WithStack(err)
+		}
+		v := reflect.ValueOf(id)
+		switch fbn.Kind() {
+		case reflect.Int, reflect.Int64:
+			fbn.SetInt(v.Int())
+		default:
+			fbn.Set(reflect.ValueOf(id))
+		}
+	}
+
+	return nil
+}