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195 changes: 195 additions & 0 deletions
195
pkg/datasource/sql/undo/builder/mysql_multi_delete_undo_log_builder.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package builder | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "database/sql/driver" | ||
| "strings" | ||
|
|
||
| "github.com/arana-db/parser/ast" | ||
| "github.com/arana-db/parser/format" | ||
|
|
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| "github.com/seata/seata-go/pkg/datasource/sql/parser" | ||
| "github.com/seata/seata-go/pkg/datasource/sql/types" | ||
| "github.com/seata/seata-go/pkg/datasource/sql/undo" | ||
| "github.com/seata/seata-go/pkg/util/log" | ||
| ) | ||
|
|
||
| func init() { | ||
| undo.RegisterUndoLogBuilder(types.MultiDeleteExecutor, GetMySQLMultiDeleteUndoLogBuilder) | ||
| } | ||
|
|
||
| type multiDelete struct { | ||
| sql string | ||
| clear bool | ||
| } | ||
|
|
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| type MySQLMultiDeleteUndoLogBuilder struct { | ||
| BasicUndoLogBuilder | ||
| } | ||
|
|
||
| func GetMySQLMultiDeleteUndoLogBuilder() undo.UndoLogBuilder { | ||
| return &MySQLMultiDeleteUndoLogBuilder{BasicUndoLogBuilder: BasicUndoLogBuilder{}} | ||
| } | ||
|
|
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| func (u *MySQLMultiDeleteUndoLogBuilder) BeforeImage(ctx context.Context, execCtx *types.ExecContext) ([]*types.RecordImage, error) { | ||
| deletes := strings.Split(execCtx.Query, ";") | ||
| if len(deletes) == 1 { | ||
| return GetMySQLDeleteUndoLogBuilder().BeforeImage(ctx, execCtx) | ||
| } | ||
|
|
||
| values := make([]driver.Value, 0, len(execCtx.NamedValues)*2) | ||
| if execCtx.Values == nil { | ||
| for n, param := range execCtx.NamedValues { | ||
| values[n] = param.Value | ||
| } | ||
| } | ||
|
|
||
| multiQuery, args, err := u.buildBeforeImageSQL(deletes, values) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| var ( | ||
| stmt driver.Stmt | ||
| rows driver.Rows | ||
|
|
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| record *types.RecordImage | ||
| records []*types.RecordImage | ||
|
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| meDataMap = execCtx.MetaDataMap[execCtx.ParseContext.DeleteStmt. | ||
| TableRefs.TableRefs.Left.(*ast.TableSource).Source.(*ast.TableName).Name.O] | ||
| ) | ||
|
|
||
| for _, sql := range multiQuery { | ||
| stmt, err = execCtx.Conn.Prepare(sql) | ||
| if err != nil { | ||
| log.Errorf("build prepare stmt: %+v", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| rows, err = stmt.Query(args) | ||
| if err != nil { | ||
| log.Errorf("stmt query: %+v", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| record, err = u.buildRecordImages(rows, meDataMap) | ||
| if err != nil { | ||
| log.Errorf("record images : %+v", err) | ||
| return nil, err | ||
| } | ||
| records = append(records, record) | ||
| } | ||
|
|
||
| return records, nil | ||
| } | ||
|
|
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| func (u *MySQLMultiDeleteUndoLogBuilder) AfterImage(ctx context.Context, execCtx *types.ExecContext, beforeImages []*types.RecordImage) ([]*types.RecordImage, error) { | ||
| return nil, nil | ||
| } | ||
|
|
||
| // buildBeforeImageSQL build delete sql from delete sql | ||
| func (u *MySQLMultiDeleteUndoLogBuilder) buildBeforeImageSQL(multiQuery []string, args []driver.Value) ([]string, []driver.Value, error) { | ||
| var ( | ||
| err error | ||
| buf, param bytes.Buffer | ||
| p *types.ParseContext | ||
| tableName string | ||
| tables = make(map[string]multiDelete, len(multiQuery)) | ||
| ) | ||
|
|
||
| for _, query := range multiQuery { | ||
| p, err = parser.DoParser(query) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| tableName = p.DeleteStmt.TableRefs.TableRefs.Left.(*ast.TableSource).Source.(*ast.TableName).Name.O | ||
|
|
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| v, ok := tables[tableName] | ||
| if ok && v.clear { | ||
| continue | ||
| } | ||
|
|
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| buf.WriteString("delete from ") | ||
| buf.WriteString(tableName) | ||
|
|
||
| if p.DeleteStmt.Where == nil { | ||
| tables[tableName] = multiDelete{sql: buf.String(), clear: true} | ||
| buf.Reset() | ||
| continue | ||
| } else { | ||
| buf.WriteString(" where ") | ||
| } | ||
|
|
||
| _ = p.DeleteStmt.Where.Restore(format.NewRestoreCtx(format.RestoreKeyWordUppercase, ¶m)) | ||
|
|
||
| v, ok = tables[tableName] | ||
| if ok { | ||
| buf.Reset() | ||
| buf.WriteString(v.sql) | ||
| buf.WriteString(" or ") | ||
| } | ||
|
|
||
| buf.Write(param.Bytes()) | ||
| tables[tableName] = multiDelete{sql: buf.String()} | ||
|
|
||
| buf.Reset() | ||
| param.Reset() | ||
| } | ||
|
|
||
| var ( | ||
| items = make([]string, 0, len(tables)) | ||
| values = make([]driver.Value, 0, len(tables)) | ||
| selStmt = ast.SelectStmt{ | ||
| SelectStmtOpts: &ast.SelectStmtOpts{}, | ||
| From: p.DeleteStmt.TableRefs, | ||
| Where: p.DeleteStmt.Where, | ||
| Fields: &ast.FieldList{Fields: []*ast.SelectField{{WildCard: &ast.WildCardField{}}}}, | ||
| OrderBy: p.DeleteStmt.Order, | ||
| Limit: p.DeleteStmt.Limit, | ||
| TableHints: p.DeleteStmt.TableHints, | ||
| LockInfo: &ast.SelectLockInfo{LockType: ast.SelectLockForUpdate}, | ||
| } | ||
| ) | ||
|
|
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| for _, table := range tables { | ||
| p, _ = parser.DoParser(table.sql) | ||
|
|
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| selStmt.From = p.DeleteStmt.TableRefs | ||
| selStmt.Where = p.DeleteStmt.Where | ||
|
|
||
| _ = selStmt.Restore(format.NewRestoreCtx(format.RestoreKeyWordUppercase, &buf)) | ||
| items = append(items, buf.String()) | ||
| buf.Reset() | ||
| if table.clear { | ||
| values = append(values, u.buildSelectArgs(&selStmt, nil)...) | ||
| } else { | ||
| values = append(values, u.buildSelectArgs(&selStmt, args)...) | ||
| } | ||
| } | ||
|
|
||
| return items, values, nil | ||
| } | ||
|
|
||
| func (u *MySQLMultiDeleteUndoLogBuilder) GetExecutorType() types.ExecutorType { | ||
| return types.MultiDeleteExecutor | ||
| } |
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