wehub-resource-sync
71 lines
2.5 KiB
Go
Executable File
71 lines
2.5 KiB
Go
Executable File
// Copyright 2022 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package diff
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import (
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"context"
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"github.com/dolthub/go-mysql-server/sql"
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)
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// ChangeType is an enum that represents the type of change in a diff
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type ChangeType int
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const (
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// None is no change
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None ChangeType = iota
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// Added is the ChangeType value for a row that was newly added (In new, but not in old)
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Added
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// Removed is the ChangeTypeProp value for a row that was newly deleted (In old, but not in new)
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Removed
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// ModifiedOld is the ChangeType value for the row which represents the old value of the row before it was changed.
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ModifiedOld
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// ModifiedNew is the ChangeType value for the row which represents the new value of the row after it was changed.
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ModifiedNew
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)
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// Mode is an enum that represents the presentation of a diff
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type Mode int
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const (
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ModeRow Mode = 0
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ModeLine Mode = 1
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ModeInPlace Mode = 2
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ModeContext Mode = 3
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)
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// SqlRowDiffWriter knows how to write diff rows for a table to an arbitrary format and destination.
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type SqlRowDiffWriter interface {
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// WriteRow writes the diff row given, of the diff type provided. colDiffTypes is guaranteed to be the same length as
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// the input row.
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WriteRow(ctx *sql.Context, row sql.Row, diffType ChangeType, colDiffTypes []ChangeType) error
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// WriteCombinedRow writes the diff of the rows given as a single, combined row.
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WriteCombinedRow(ctx *sql.Context, oldRow, newRow sql.Row, mode Mode) error
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// Close finalizes the work of this writer.
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Close(ctx context.Context) error
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}
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// SchemaDiffWriter knows how to write SQL DDL statements for a schema diff for a table to an arbitrary format and
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// destination.
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type SchemaDiffWriter interface {
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// WriteSchemaDiff writes the schema diff given (a SQL statement) and returns any error. A single table may have
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// many SQL statements for a single diff. WriteSchemaDiff will be called before any row diffs via |WriteRow|
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WriteSchemaDiff(schemaDiffStatement string) error
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// Close finalizes the work of this writer.
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Close() error
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}
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