From 4debbde8bfff2baf2e522c16b1a5a98ec65104ab Mon Sep 17 00:00:00 2001
From: HEXINGZE <2046084122@qq.com>
Date: Tue, 3 Dec 2024 01:00:28 +0800
Subject: [PATCH] bugfix #704

---
 ...sertonduplicate_update_undo_log_builder.go | 35 -------------------
 1 file changed, 35 deletions(-)

diff --git a/pkg/datasource/sql/undo/builder/mysql_insertonduplicate_update_undo_log_builder.go b/pkg/datasource/sql/undo/builder/mysql_insertonduplicate_update_undo_log_builder.go
index 5da3d35e7..66b03750d 100644
--- a/pkg/datasource/sql/undo/builder/mysql_insertonduplicate_update_undo_log_builder.go
+++ b/pkg/datasource/sql/undo/builder/mysql_insertonduplicate_update_undo_log_builder.go
@@ -110,18 +110,13 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildBeforeImageSQL(insertStmt *a
 	if err != nil {
 		return "", nil, err
 	}
-
 	paramMap, err := u.buildImageParameters(insertStmt, args, insertRows)
 	if err != nil {
 		return "", nil, err
 	}
-
-	// 如果没有参数或没有主键索引，直接返回空
 	if len(paramMap) == 0 || len(metaData.Indexs) == 0 {
 		return "", nil, nil
 	}
-
-	// 检查是否有主键
 	hasPK := false
 	for _, index := range metaData.Indexs {
 		if strings.EqualFold("PRIMARY", index.Name) {
@@ -132,29 +127,24 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildBeforeImageSQL(insertStmt *a
 	if !hasPK {
 		return "", nil, nil
 	}
-
 	var sql strings.Builder
 	sql.WriteString("SELECT * FROM " + metaData.TableName + "  ")
 
 	var selectArgs []driver.Value
 	isContainWhere := false
 	hasConditions := false
-
 	for i := 0; i < len(insertRows); i++ {
 		var rowConditions []string
 		var rowArgs []driver.Value
 		usedParams := make(map[string]bool)
-
 		// First try unique indexes
 		for _, index := range metaData.Indexs {
 			if index.NonUnique || strings.EqualFold("PRIMARY", index.Name) {
 				continue
 			}
-
 			if !isIndexValueNotNull(index, paramMap, i) {
 				continue
 			}
-
 			var indexConditions []string
 			var indexArgs []driver.Value
 			allColumnsPresent := true
@@ -171,20 +161,17 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildBeforeImageSQL(insertStmt *a
 					break
 				}
 			}
-
 			if allColumnsPresent && len(indexConditions) > 0 {
 				rowConditions = append(rowConditions, "("+strings.Join(indexConditions, " and ")+")")
 				rowArgs = append(rowArgs, indexArgs...)
 				hasConditions = true
 			}
 		}
-
 		// Then try primary key
 		for _, index := range metaData.Indexs {
 			if !strings.EqualFold("PRIMARY", index.Name) {
 				continue
 			}
-
 			var pkConditions []string
 			var pkArgs []driver.Value
 			for _, colMeta := range index.Columns {
@@ -195,14 +182,12 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildBeforeImageSQL(insertStmt *a
 					pkArgs = append(pkArgs, params[i])
 				}
 			}
-
 			if len(pkConditions) > 0 {
 				rowConditions = append(rowConditions, "("+strings.Join(pkConditions, " and ")+")")
 				rowArgs = append(rowArgs, pkArgs...)
 				hasConditions = true
 			}
 		}
-
 		if len(rowConditions) > 0 {
 			if !isContainWhere {
 				sql.WriteString("WHERE ")
@@ -219,11 +204,9 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildBeforeImageSQL(insertStmt *a
 			selectArgs = append(selectArgs, rowArgs...)
 		}
 	}
-
 	if !hasConditions {
 		return "", nil, nil
 	}
-
 	sqlStr := sql.String()
 	log.Infof("build select sql by insert on duplicate sourceQuery, sql: %s", sqlStr)
 	return sqlStr, selectArgs, nil
@@ -237,38 +220,29 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) AfterImage(ctx context.Context, e
 		return nil, err
 	}
 	defer stmt.Close()
-
 	tableName := execCtx.ParseContext.InsertStmt.Table.TableRefs.Left.(*ast.TableSource).Source.(*ast.TableName).Name.O
 	metaData := execCtx.MetaDataMap[tableName]
-
 	rows, err := stmt.Query(selectArgs)
 	if err != nil {
 		return nil, err
 	}
 	defer rows.Close()
-
 	image, err := u.buildRecordImages(rows, &metaData)
 	if err != nil {
 		return nil, err
 	}
-
 	return []*types.RecordImage{image}, nil
 }
 
 func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildAfterImageSQL(ctx context.Context, beforeImages []*types.RecordImage) (string, []driver.Value) {
 	selectSQL, selectArgs := u.BeforeSelectSql, u.Args
-
 	var beforeImage *types.RecordImage
 	if len(beforeImages) > 0 {
 		beforeImage = beforeImages[0]
 	}
-
-	// 如果没有before image，直接返回原始SQL和参数
 	if beforeImage == nil || len(beforeImage.Rows) == 0 {
 		return selectSQL, selectArgs
 	}
-
-	// 收集主键值
 	primaryValueMap := make(map[string][]interface{})
 	for _, row := range beforeImage.Rows {
 		for _, col := range row.Columns {
@@ -277,19 +251,13 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildAfterImageSQL(ctx context.Co
 			}
 		}
 	}
-
 	var afterImageSql strings.Builder
 	afterImageSql.WriteString(selectSQL)
-
-	// 如果原始SQL已经包含了所有需要的条件，直接返回
 	if len(primaryValueMap) == 0 || len(selectArgs) == len(beforeImage.Rows)*len(primaryValueMap) {
 		return selectSQL, selectArgs
 	}
-
-	// 添加主键条件
 	var primaryValues []driver.Value
 	usedPrimaryKeys := make(map[string]bool)
-
 	for name := range primaryValueMap {
 		if !u.BeforeImageSqlPrimaryKeys[name] {
 			usedPrimaryKeys[name] = true
@@ -304,15 +272,12 @@ func (u *MySQLInsertOnDuplicateUndoLogBuilder) buildAfterImageSQL(ctx context.Co
 			}
 		}
 	}
-
 	if len(primaryValues) > 0 {
 		afterImageSql.WriteString(" OR (" + strings.Join(u.buildPrimaryKeyConditions(primaryValueMap, usedPrimaryKeys), " and  ") + ") ")
 	}
-
 	finalArgs := make([]driver.Value, len(selectArgs)+len(primaryValues))
 	copy(finalArgs, selectArgs)
 	copy(finalArgs[len(selectArgs):], primaryValues)
-
 	sqlStr := afterImageSql.String()
 	log.Infof("build after select sql by insert on duplicate sourceQuery, sql %s", sqlStr)
 	return sqlStr, finalArgs