074649835b
This attempts to add a README.md to help create consistent migrations that maximize our test coverage and do not include unnecessary statements. It also adds a feature to have an `-- OLD DATA --` section as well as a `-- NEW DATA --` section so that we can fix mistakes made in previous snapshots (like a row that was forgotten to be added when a table was created) without editing them going forward. Change-Id: I28a786f8ef163cae1de1bb08f61af1e1104b0a88
94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package sqliteutil
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import (
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"context"
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"strconv"
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sqlite3 "github.com/mattn/go-sqlite3"
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"github.com/zeebo/errs"
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"storj.io/storj/private/dbutil/dbschema"
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"storj.io/storj/private/tagsql"
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)
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// LoadSchemaFromSQL inserts script into connstr and loads schema.
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func LoadSchemaFromSQL(ctx context.Context, script string) (_ *dbschema.Schema, err error) {
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db, err := tagsql.Open("sqlite3", ":memory:")
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if err != nil {
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return nil, errs.Wrap(err)
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}
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defer func() { err = errs.Combine(err, db.Close()) }()
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_, err = db.ExecContext(ctx, script)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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return QuerySchema(ctx, db)
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}
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// LoadSnapshotFromSQL inserts script into connstr and loads schema.
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func LoadSnapshotFromSQL(ctx context.Context, script string) (_ *dbschema.Snapshot, err error) {
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db, err := tagsql.Open("sqlite3", ":memory:")
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if err != nil {
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return nil, errs.Wrap(err)
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}
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defer func() { err = errs.Combine(err, db.Close()) }()
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_, err = db.ExecContext(ctx, script)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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snapshot, err := QuerySnapshot(ctx, db)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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snapshot.Sections = dbschema.NewSections(script)
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return snapshot, nil
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}
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// QuerySnapshot loads snapshot from database
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func QuerySnapshot(ctx context.Context, db dbschema.Queryer) (*dbschema.Snapshot, error) {
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schema, err := QuerySchema(ctx, db)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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data, err := QueryData(ctx, db, schema)
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if err != nil {
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return nil, errs.Wrap(err)
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}
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return &dbschema.Snapshot{
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Version: -1,
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Schema: schema,
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Data: data,
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}, err
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}
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// QueryData loads all data from tables
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func QueryData(ctx context.Context, db dbschema.Queryer, schema *dbschema.Schema) (*dbschema.Data, error) {
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return dbschema.QueryData(ctx, db, schema, func(columnName string) string {
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quoted := strconv.Quote(columnName)
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return `quote(` + quoted + `) as ` + quoted
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})
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}
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// IsConstraintError checks if given error is about constraint violation
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func IsConstraintError(err error) bool {
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return errs.IsFunc(err, func(err error) bool {
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if e, ok := err.(sqlite3.Error); ok {
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if e.Code == sqlite3.ErrConstraint {
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return true
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}
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}
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return false
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})
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}
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