sqlDB, _ := tx.DB()
	sqlDB.SetMaxOpenConns(1)

	tx = tx.Session(&gorm.Session{PrepareStmt: true})

	wg := sync.WaitGroup{}
	for i := 0; i < 100; i++ {
		wg.Add(1)
		go func() {
			user := User{Name: "jinzhu"}
			tx.Create(&user)

			var result User
			tx.First(&result)
			wg.Done()
		}()
	}
	wg.Wait()

	conn, ok := tx.ConnPool.(*gorm.PreparedStmtDB)
	AssertEqual(t, ok, true)

package tests_test

import (
	"errors"
	"fmt"
	"regexp"
	"testing"
	"time"

	"github.com/jinzhu/now"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
	. "gorm.io/gorm/utils/tests"
)

func TestCreate(t *testing.T) {
	user := *GetUser("create", Config{})

	if results := DB.Create(&user); results.Error != nil {
		t.Fatalf("errors happened when create: %v", results.Error)
	} else if results.RowsAffected != 1 {

	}, {
		SQL:          "@@test AND name1 = @name1 AND name2 = @name2 AND name3 = @name1 @notexist",
		Vars:         []interface{}{sql.Named("name1", "jinzhu"), sql.Named("name2", "jinzhu2")},
		Result:       "@@test AND name1 = ? AND name2 = ? AND name3 = ? @notexist",
		ExpectedVars: []interface{}{"jinzhu", "jinzhu2", "jinzhu"},
	}, {

//
//	// Find the first user with name jinzhu
//	db.Where("name = ?", "jinzhu").First(&user)
//	// Find the first user with name jinzhu and age 20
//	db.Where(&User{Name: "jinzhu", Age: 20}).First(&user)
//	// Find the first user with name jinzhu and age not equal to 20
//	db.Where("name = ?", "jinzhu").Where("age <> ?", "20").First(&user)
//

package schema

import (
	"crypto/sha1"
	"encoding/hex"
	"regexp"
	"strings"
	"unicode/utf8"

	"github.com/jinzhu/inflection"
)

// Namer namer interface
type Namer interface {
	TableName(table string) string
	SchemaName(table string) string
	ColumnName(table, column string) string
	JoinTableName(joinTable string) string
	RelationshipFKName(Relationship) string
	CheckerName(table, column string) string

			NumericRegexp: nil,
			Vars:          []interface{}{"jinzhu", 1, 999.99, true, []byte("12345"), tt, &tt, nil, "w@g.\"com", myrole, pwd},
			Result:        `create table users (name, age, height, actived, bytes, create_at, update_at, deleted_at, email, role, pass) values ("jinzhu", 1, 999.99, true, "12345", "2020-02-23 11:10:10", "2020-02-23 11:10:10", NULL, "w@g.""com", "admin", "pass")`,
		},
		{

github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=

		} else if results.RowsAffected != 1 {
			t.Fatalf("rows affected expects: %v, got %v", 1, results.RowsAffected)
		} else if got.ID != u1.ID {
			t.Fatalf("select expects: %v, got %v", u1, got)
		}

		u1.Name = "jinzhu"
		if results := DB.Save(&u1); results.Error != nil {
			t.Fatalf("errors happened on update: %v", results.Error)
		} else if results.RowsAffected != 1 {
			t.Fatalf("rows affected expects: %v, got %v", 1, results.RowsAffected)

//	// user -> User{Name: "non_existing", Email: "******@****.***"}
//
//	// assign email regardless of if record is found
//	db.Where(User{Name: "jinzhu"}).Assign(User{Email: "******@****.***"}).FirstOrInit(&user)
//	// user -> User{Name: "jinzhu", Age: 20, Email: "******@****.***"}
func (db *DB) FirstOrInit(dest interface{}, conds ...interface{}) (tx *DB) {
	queryTx := db.Limit(1).Order(clause.OrderByColumn{

			}},
			"SELECT * FROM `users` WHERE `users`.`id` = ? AND `age` > ? OR `name` <> ?",
			[]interface{}{"1", 18, "jinzhu"},
		},
		{
			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{