commands out of sync. did you run multiple statements at once

problem

The database connection error is caused after several insert operations , Throw an error
commands out of sync. did you run multiple statements at once

reason

1. First, the normal insertion operation can eliminate the problem of connection parameters
2. The check found that the database was inserted many times, resulting in open Too many database connections .
   

solve

Define global database connections , That is, the same connection is used multiple times

Define a public variable

var (
	DB *gorm.DB
)

Define a function to establish a connection

func GetDB() (*gorm.DB,error) {
    
	dsn := "root:[email protected](127.0.0.1:3306)/trs_hycloud_igi?charset=utf8&parseTime=True&loc=Local"
	db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
    })
	if err != nil {
    
		return nil, err
	}
	return db, err
}

Call the connected function in the main function and assign values to the defined public variables

func main() {
    
	service.DB,_= service.GetDB()
}

Other database operations can directly use public variable operations

	db := DB
	db.Create(&reply)