// [Referrers] *comment only

    // ===================================================================================
    //                                                                             DB Meta
    //                                                                             =======
    @Override
    public UserDbm asDBMeta() {
        return UserDbm.getInstance();
    }

    @Override

    Note over dep: Run code up to yield
    opt raise Exception
        dep -->> handler: Raise Exception
        handler -->> client: HTTP error response
    end
    dep ->> operation: Run dependency, e.g. DB session
    opt raise
        operation -->> dep: Raise Exception (e.g. HTTPException)
        opt handle
            dep -->> dep: Can catch exception, raise a new HTTPException, raise other exception
        end

    Note over dep: Run code up to yield
    opt raise Exception
        dep -->> handler: Raise Exception
        handler -->> client: HTTP error response
    end
    dep ->> operation: Run dependency, e.g. DB session
    opt raise
        operation -->> dep: Raise Exception (e.g. HTTPException)
        opt handle
            dep -->> dep: Can catch exception, raise a new HTTPException, raise other exception
        end

pkg crypto/x509, method (InsecureAlgorithmError) Error() string
pkg crypto/x509, method (SignatureAlgorithm) String() string
pkg crypto/x509, type InsecureAlgorithmError int
pkg database/sql, method (*DB) SetConnMaxLifetime(time.Duration)
pkg debug/dwarf, const ClassUnknown = 0
pkg debug/dwarf, const ClassUnknown Class
pkg debug/elf, const COMPRESS_HIOS = 1879048191
pkg debug/elf, const COMPRESS_HIOS CompressionType

    Note over dep: Run code up to yield
    opt raise Exception
        dep -->> handler: Raise Exception
        handler -->> client: HTTP error response
    end
    dep ->> operation: Run dependency, e.g. DB session
    opt raise
        operation -->> dep: Raise Exception (e.g. HTTPException)
        opt handle
            dep -->> dep: Can catch exception, raise a new HTTPException, raise other exception
        end

ARGS:
connection_string*   (string)             Postgres server connection-string e.g. "host=localhost port=5432 dbname=minio_events user=postgres password=password sslmode=disable"
table*               (string)             DB table name to store/update events, table is auto-created
format*              (namespace*|access)  'namespace' reflects current bucket/object list and 'access' reflects a journal of object operations, defaults to 'namespace'

            "3ffe::1.net",
            "3ffe::1::1",
            "1::2::3::4:5",
            "::7:6:5:4:3:2:", // should end with ":0"
            ":6:5:4:3:2:1::", // should begin with "0:"
            "2001::db:::1",
            "FEDC:9878",
            "+1.+2.+3.4",
            "1.2.3.4e0",
            "6:5:4:3:2:1:0", // too few parts
            "::7:6:5:4:3:2:1:0", // too many parts

	DB.Migrator().DropTable(&Product{})
	DB.AutoMigrate(&Product{})

	p := Product{Code: "Invalid", Price: 100}
	if DB.Save(&p).Error == nil {
		t.Fatalf("An error from before create callbacks happened when create with invalid value")
	}

	if DB.Where("code = ?", "Invalid").First(&Product{}).Error == nil {
		t.Fatalf("Should not save record that have errors")
	}

	}

	DB.Model(&hamster).Association("PreferredToy").Clear()

	if DB.Model(&hamster2).Association("PreferredToy").Count() != 0 {
		t.Errorf("Hamster's preferred toy should be cleared with Clear")
	}

	if DB.Model(&hamster2).Association("OtherToy").Count() != 1 {
		t.Errorf("Hamster's other toy should be still available")
	}

	DB.Model(&hamster).Association("OtherToy").Clear()

	}
}

func TestGaussDBAlterColumnDataType(t *testing.T) {
	if DB.Dialector.Name() != "gaussdb" {
		t.Skip()
	}
	DB.Migrator().DropTable(&Company{})
	DB.AutoMigrate(Company{})
	if err := DB.Table("companies").Migrator().AlterColumn(CompanyNew{}, "name"); err != nil {
		t.Fatalf("failed to alter column from string to int, got error %v", err)
	}

	DB.AutoMigrate(Company{})