ExplainSQL using consecutive pairs of escaper in SQL string represents an escaper

[iTanken]

Explain your user case and expected results

func TestGORM(t *testing.T) {
	user := User{Name: `"jin'zhu"`} // string values contain single or double quotes

	DB.Create(&user)

	var result User
	if err := DB.First(&result, user.ID).Error; err != nil {
		t.Errorf("Failed, got error: %v", err)
	}
}

func TestExplain(t *testing.T) {
	type args struct {
		prepareSql string
		values     []interface{}
	}
	tests := []struct {
		name    string
		args    args
		wantSQL string
	}{
		{"mysql", args{"SELECT ? AS QUOTES_STR", []interface{}{"'"}}, `SELECT '''' AS QUOTES_STR`},
		{"postgres", args{"SELECT $1 AS QUOTES_STR", []interface{}{"'"}}, `SELECT '''' AS QUOTES_STR`},
		{"sqlserver", args{"SELECT @p1 AS QUOTES_STR", []interface{}{"'"}}, `SELECT '''' AS QUOTES_STR`},
		{"sqlite", args{"SELECT ? AS QUOTES_STR", []interface{}{`"`}}, `SELECT """" AS QUOTES_STR`},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if name := DB.Dialector.Name(); name != tt.name {
				t.Logf("%s skip %s...", name, tt.name)
				return
			}
			gotSQL := DB.Dialector.Explain(tt.args.prepareSql, tt.args.values...)
			if reflect.DeepEqual(gotSQL, tt.wantSQL) {
				var result string
				if err := DB.Raw(gotSQL).Row().Scan(&result); err == nil {
					t.Logf("exec `%s` result = `%s`", gotSQL, result)
				} else {
					t.Errorf("exec `%s` got error: %v", gotSQL, err)
				}
			} else {
				t.Errorf("Explain gotSQL = %v, want %v", gotSQL, tt.wantSQL)
			}
		})
	}
}

Results

SQLite

testing sqlite...
2023/12/28 01:29:27 testing sqlite3...
=== RUN   TestGORM

2023/12/28 01:29:27 /home/runner/work/playground/playground/main_test.go:21
[5.7[64](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19993993951?pr=677#step:5:65)ms] [rows:1] INSERT INTO `users` (`created_at`,`updated_at`,`deleted_at`,`name`,`age`,`birthday`,`company_id`,`manager_id`,`active`) VALUES ("2023-12-28 01:29:27.08","2023-12-28 01:29:27.08",NULL,"""jin'zhu""",0,NULL,NULL,NULL,false) RETURNING `id`

2023/12/28 01:29:27 /home/runner/work/playground/playground/main_test.go:24
[1.341ms] [rows:1] SELECT * FROM `users` WHERE `users`.`id` = 1 AND `users`.`deleted_at` IS NULL ORDER BY `users`.`id` LIMIT 1
--- PASS: TestGORM (0.01s)
=== RUN   TestExplain
=== RUN   TestExplain/sqlite

2023/12/28 01:29:27 /home/runner/work/playground/playground/main_test.go:53
[0.218ms] [rows:-] SELECT """" AS QUOTES_STR
    main_test.go:54: exec `SELECT """" AS QUOTES_STR` result = `"`

--- PASS: TestExplain (0.00s)

MySQL

testing mysql...
[20](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015928?pr=677#step:6:21)23/12/28 01:31:17 testing mysql...
=== RUN   TestGORM

2023/12/28 01:31:18 /home/runner/work/playground/playground/main_test.go:[21](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015928?pr=677#step:6:22)
[4.632ms] [rows:1] INSERT INTO `users` (`created_at`,`updated_at`,`deleted_at`,`name`,`age`,`birthday`,`company_id`,`manager_id`,`active`) VALUES ('20[23](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015928?pr=677#step:6:24)-12-28 01:31:18.095','2023-12-28 01:31:18.095',NULL,'"jin''zhu"',0,NULL,NULL,NULL,false)

2023/12/28 01:31:18 /home/runner/work/playground/playground/main_test.go:[24](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015928?pr=677#step:6:25)
[0.882ms] [rows:1] SELECT * FROM `users` WHERE `users`.`id` = 1 AND `users`.`deleted_at` IS NULL ORDER BY `users`.`id` LIMIT 1
--- PASS: TestGORM (0.01s)
=== RUN   TestExplain
=== RUN   TestExplain/mysql

2023/12/28 01:31:18 /home/runner/work/playground/playground/main_test.go:53
[0.[29](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015928?pr=677#step:6:30)0ms] [rows:-] SELECT '''' AS QUOTES_STR
    main_test.go:54: exec `SELECT '''' AS QUOTES_STR` result = `'`

--- PASS: TestExplain (0.00s)

PostgreSQL

testing postgres...
[20](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015831?pr=677#step:6:21)23/12/28 01:31:19 testing postgres...
=== RUN   TestGORM

2023/12/28 01:31:19 /home/runner/work/playground/playground/main_test.go:[21](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015831?pr=677#step:6:22)
[1.664ms] [rows:1] INSERT INTO "users" ("created_at","updated_at","deleted_at","name","age","birthday","company_id","manager_id","active") VALUES ('20[23](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015831?pr=677#step:6:24)-12-28 01:31:19.49','2023-12-28 01:31:19.49',NULL,'"jin''zhu"',0,NULL,NULL,NULL,false) RETURNING "id"

2023/12/28 01:31:19 /home/runner/work/playground/playground/main_test.go:[24](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015831?pr=677#step:6:25)
[1.010ms] [rows:1] SELECT * FROM "users" WHERE "users"."id" = 1 AND "users"."deleted_at" IS NULL ORDER BY "users"."id" LIMIT 1
--- PASS: TestGORM (0.00s)
=== RUN   TestExplain
=== RUN   TestExplain/postgres

2023/12/28 01:31:19 /home/runner/work/playground/playground/main_test.go:53
[0.442ms] [rows:-] SELECT '''' AS QUOTES_STR
    main_test.go:54: exec `SELECT '''' AS QUOTES_STR` result = `'`

--- PASS: TestExplain (0.00s)

SQL Server

testing sqlserver...
[20](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015738?pr=677#step:6:21)23/12/28 01:31:25 testing sqlserver...
=== RUN   TestGORM

2023/12/28 01:31:25 /home/runner/work/playground/playground/main_test.go:[21](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015738?pr=677#step:6:22)
[3.183ms] [rows:1] INSERT INTO "users" ("created_at","updated_at","deleted_at","name","age","birthday","company_id","manager_id","active") OUTPUT INSERTED."id" VALUES ('20[23](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015738?pr=677#step:6:24)-12-28 01:31:25.38','2023-12-28 01:31:25.38',NULL,'"jin''zhu"',0,NULL,NULL,NULL,0);

2023/12/28 01:31:25 /home/runner/work/playground/playground/main_test.go:[24](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015738?pr=677#step:6:25)
[1.175ms] [rows:1] SELECT * FROM "users" WHERE "users"."id" = 1 AND "users"."deleted_at" IS NULL ORDER BY "users"."id" OFFSET 0 ROW FETCH NEXT 1 ROWS ONLY
--- PASS: TestGORM (0.00s)
=== RUN   TestExplain
=== RUN   TestExplain/sqlserver

2023/12/28 01:31:[25](https://github.com/go-gorm/playground/actions/runs/7343430750/job/19994015738?pr=677#step:6:26) /home/runner/work/playground/playground/main_test.go:53
[0.492ms] [rows:-] SELECT '''' AS QUOTES_STR
    main_test.go:54: exec `SELECT '''' AS QUOTES_STR` result = `'`

--- PASS: TestExplain (0.00s)