diff --git a/pkg/datasource/sql/undo/builder/basic_undo_log_builder_test.go b/pkg/datasource/sql/undo/builder/basic_undo_log_builder_test.go
index 152c0a47d..238dd5835 100644
--- a/pkg/datasource/sql/undo/builder/basic_undo_log_builder_test.go
+++ b/pkg/datasource/sql/undo/builder/basic_undo_log_builder_test.go
@@ -50,22 +50,129 @@ func TestBuildWhereConditionByPKs(t *testing.T) {
 }
 
 func TestBuildLockKey(t *testing.T) {
-	metaData := types.TableMeta{
-		TableName: "test_name",
-		Indexs: map[string]types.IndexMeta{
-			"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "id"}, {ColumnName: "userId"}}},
-		},
-	}
+	var builder BasicUndoLogBuilder
 
-	records := types.RecordImage{
-		TableName: "test_name",
-		Rows: []types.RowImage{
-			{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 1}, {KeyType: types.IndexTypePrimaryKey, ColumnName: "userId", Value: "one"}}},
-			{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 2}, {KeyType: types.IndexTypePrimaryKey, ColumnName: "userId", Value: "two"}}},
+	tests := []struct {
+		name     string
+		metaData types.TableMeta
+		records  types.RecordImage
+		expected string
+	}{
+		{
+			name: "Two Primary Keys",
+			metaData: types.TableMeta{
+				TableName: "test_name",
+				Indexs: map[string]types.IndexMeta{
+					"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "id"}, {ColumnName: "userId"}}},
+				},
+			},
+			records: types.RecordImage{
+				TableName: "test_name",
+				Rows: []types.RowImage{
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 1}, {KeyType: types.IndexTypePrimaryKey, ColumnName: "userId", Value: "one"}}},
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 2}, {KeyType: types.IndexTypePrimaryKey, ColumnName: "userId", Value: "two"}}},
+				},
+			},
+			expected: "test_name:1_one,2_two",
+		},
+		{
+			name: "Single Primary Key",
+			metaData: types.TableMeta{
+				TableName: "single_key",
+				Indexs: map[string]types.IndexMeta{
+					"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "id"}}},
+				},
+			},
+			records: types.RecordImage{
+				TableName: "single_key",
+				Rows: []types.RowImage{
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 100}}},
+				},
+			},
+			expected: "single_key:100",
+		},
+		{
+			name: "Mixed Type Keys",
+			metaData: types.TableMeta{
+				TableName: "mixed_key",
+				Indexs: map[string]types.IndexMeta{
+					"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "name"}, {ColumnName: "age"}}},
+				},
+			},
+			records: types.RecordImage{
+				TableName: "mixed_key",
+				Rows: []types.RowImage{
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "name", Value: "Alice"}, {KeyType: types.IndexTypePrimaryKey, ColumnName: "age", Value: 25}}},
+				},
+			},
+			expected: "mixed_key:Alice_25",
+		},
+		{
+			name: "Empty Records",
+			metaData: types.TableMeta{
+				TableName: "empty",
+				Indexs: map[string]types.IndexMeta{
+					"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "id"}}},
+				},
+			},
+			records:  types.RecordImage{TableName: "empty"},
+			expected: "empty:",
+		},
+		{
+			name: "Duplicate Primary Keys",
+			metaData: types.TableMeta{
+				TableName: "dupes",
+				Indexs: map[string]types.IndexMeta{
+					"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "id"}}},
+				},
+			},
+			records: types.RecordImage{
+				TableName: "dupes",
+				Rows: []types.RowImage{
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 1}}},
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 1}}},
+				},
+			},
+			expected: "dupes:1,1",
+		},
+		{
+			name: "Special Characters",
+			metaData: types.TableMeta{
+				TableName: "special",
+				Indexs: map[string]types.IndexMeta{
+					"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "id"}}},
+				},
+			},
+			records: types.RecordImage{
+				TableName: "special",
+				Rows: []types.RowImage{
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: "a,b_c"}}},
+				},
+			},
+			expected: "special:a,b_c",
+		},
+		{
+			name: "Non-existent Key Name",
+			metaData: types.TableMeta{
+				TableName: "error_key",
+				Indexs: map[string]types.IndexMeta{
+					"PRIMARY_KEY": {IType: types.IndexTypePrimaryKey, Columns: []types.ColumnMeta{{ColumnName: "non_existent"}}},
+				},
+			},
+			records: types.RecordImage{
+				TableName: "error_key",
+				Rows: []types.RowImage{
+					{Columns: []types.ColumnImage{{KeyType: types.IndexTypePrimaryKey, ColumnName: "id", Value: 1}}},
+				},
+			},
+			expected: "error_key:",
 		},
 	}
 
-	builder := BasicUndoLogBuilder{}
-	lockKeys := builder.buildLockKey2(&records, metaData)
-	assert.Equal(t, "test_name:1_one,2_two", lockKeys)
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			lockKeys := builder.buildLockKey2(&tt.records, tt.metaData)
+			assert.Equal(t, tt.expected, lockKeys)
+		})
+	}
 }