Golang ChaincodeStub.DeleteRow方法代碼示例

func (t *AssetManagementChaincode) transfer(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
	if len(args) != 2 {
		return nil, errors.New("Incorrect number of arguments. Expecting 2")
	}

	asset := args[0]
	newOwner := []byte(args[1])

	// Verify the identity of the caller
	// Only the owner can transfer one of his assets
	var columns []shim.Column
	col1 := shim.Column{Value: &shim.Column_String_{String_: asset}}
	columns = append(columns, col1)

	row, err := stub.GetRow("AssetsOwnership", columns)
	if err != nil {
		return nil, fmt.Errorf("Failed retrieving asset [%s]: [%s]", asset, err)
	}

	prvOwner := row.Columns[1].GetBytes()
	myLogger.Debug("Previous owener of [%s] is [% x]", asset, prvOwner)
	if len(prvOwner) == 0 {
		return nil, fmt.Errorf("Invalid previous owner. Nil")
	}

	// Verify ownership
	ok, err := t.isCaller(stub, prvOwner)
	if err != nil {
		return nil, errors.New("Failed checking asset owner identity")
	}
	if !ok {
		return nil, errors.New("The caller is not the owner of the asset")
	}

	// At this point, the proof of ownership is valid, then register transfer
	err = stub.DeleteRow(
		"AssetsOwnership",
		[]shim.Column{shim.Column{Value: &shim.Column_String_{String_: asset}}},
	)
	if err != nil {
		return nil, errors.New("Failed deliting row.")
	}

	_, err = stub.InsertRow(
		"AssetsOwnership",
		shim.Row{
			Columns: []*shim.Column{
				&shim.Column{Value: &shim.Column_String_{String_: asset}},
				&shim.Column{Value: &shim.Column_Bytes{Bytes: newOwner}},
			},
		})
	if err != nil {
		return nil, errors.New("Failed inserting row.")
	}

	return nil, nil
}

// deleteAccountRecord deletes the record row associated with an account ID on the chaincode state table
// stub: chaincodestub
// accountID: account ID (record matching this account ID will be deleted after calling this method)
func (t *depositoryHandler) deleteAccountRecord(stub *shim.ChaincodeStub, accountID string) error {

	myLogger.Debugf("insert accountID= %v", accountID)

	//delete record matching account ID passed in
	err := stub.DeleteRow(
		"AssetsOwnership",
		[]shim.Column{shim.Column{Value: &shim.Column_String_{String_: accountID}}},
	)

	if err != nil {
		myLogger.Errorf("system error %v", err)
		return errors.New("error in deleting account record")
	}
	return nil
}

func (t *AssetManagementChaincode) transfer(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
	if len(args) != 2 {
		return nil, errors.New("Incorrect number of arguments. Expecting 2")
	}

	asset := args[0]

	newOwner, err := base64.StdEncoding.DecodeString(args[1])
	if err != nil {
		fmt.Printf("Error decoding [%v] \n", err)
		return nil, errors.New("Failed decoding owner")
	}

	// Verify the identity of the caller
	// Only the owner can transfer one of his assets
	var columns []shim.Column
	col1 := shim.Column{Value: &shim.Column_String_{String_: asset}}
	columns = append(columns, col1)

	row, err := stub.GetRow("AssetsOwnership", columns)
	if err != nil {
		return nil, fmt.Errorf("Failed retrieving asset [%s]: [%s]", asset, err)
	}

	prvOwner := row.Columns[1].GetBytes()
	myLogger.Debugf("Previous owener of [%s] is [% x]", asset, prvOwner)
	if len(prvOwner) == 0 {
		return nil, fmt.Errorf("Invalid previous owner. Nil")
	}

	// Verify ownership
	callerAccount, err := stub.ReadCertAttribute("account")
	if err != nil {
		return nil, fmt.Errorf("Failed fetching caller account. Error was [%v]", err)
	}

	if bytes.Compare(prvOwner, callerAccount) != 0 {
		return nil, fmt.Errorf("Failed verifying caller ownership.")
	}

	newOwnerAccount, err := attr.GetValueFrom("account", newOwner)
	if err != nil {
		return nil, fmt.Errorf("Failed fetching new owner account. Error was [%v]", err)
	}

	// At this point, the proof of ownership is valid, then register transfer
	err = stub.DeleteRow(
		"AssetsOwnership",
		[]shim.Column{shim.Column{Value: &shim.Column_String_{String_: asset}}},
	)
	if err != nil {
		return nil, errors.New("Failed deliting row.")
	}

	_, err = stub.InsertRow(
		"AssetsOwnership",
		shim.Row{
			Columns: []*shim.Column{
				&shim.Column{Value: &shim.Column_String_{String_: asset}},
				&shim.Column{Value: &shim.Column_Bytes{Bytes: newOwnerAccount}},
			},
		})
	if err != nil {
		return nil, errors.New("Failed inserting row.")
	}

	return nil, nil
}

//.........這裏部分代碼省略.........
		columns = append(columns, &col6)
		columns = append(columns, &col7)

		row := shim.Row{Columns: columns}
		ok, err := stub.InsertRow("tableThree", row)
		if err != nil {
			return nil, fmt.Errorf("insertRowTableThree operation failed. %s", err)
		}
		if !ok {
			return nil, errors.New("insertRowTableThree operation failed. Row with given key already exists")
		}

	case "insertRowTableFour":
		if len(args) < 1 {
			return nil, errors.New("insertRowTableFour failed. Must include 1 column value1")
		}

		col1Val := args[0]

		var columns []*shim.Column
		col1 := shim.Column{Value: &shim.Column_String_{String_: col1Val}}
		columns = append(columns, &col1)

		row := shim.Row{Columns: columns}
		ok, err := stub.InsertRow("tableFour", row)
		if err != nil {
			return nil, fmt.Errorf("insertRowTableFour operation failed. %s", err)
		}
		if !ok {
			return nil, errors.New("insertRowTableFour operation failed. Row with given key already exists")
		}

	case "deleteRowTableOne":
		if len(args) < 1 {
			return nil, errors.New("deleteRowTableOne failed. Must include 1 key value")
		}

		col1Val := args[0]
		var columns []shim.Column
		col1 := shim.Column{Value: &shim.Column_String_{String_: col1Val}}
		columns = append(columns, col1)

		err := stub.DeleteRow("tableOne", columns)
		if err != nil {
			return nil, fmt.Errorf("deleteRowTableOne operation failed. %s", err)
		}

	case "replaceRowTableOne":
		if len(args) < 3 {
			return nil, errors.New("replaceRowTableOne failed. Must include 3 column values")
		}

		col1Val := args[0]
		col2Int, err := strconv.ParseInt(args[1], 10, 32)
		if err != nil {
			return nil, errors.New("replaceRowTableOne failed. arg[1] must be convertable to int32")
		}
		col2Val := int32(col2Int)
		col3Int, err := strconv.ParseInt(args[2], 10, 32)
		if err != nil {
			return nil, errors.New("replaceRowTableOne failed. arg[2] must be convertable to int32")
		}
		col3Val := int32(col3Int)

		var columns []*shim.Column
		col1 := shim.Column{Value: &shim.Column_String_{String_: col1Val}}
		col2 := shim.Column{Value: &shim.Column_Int32{Int32: col2Val}}
		col3 := shim.Column{Value: &shim.Column_Int32{Int32: col3Val}}
		columns = append(columns, &col1)
		columns = append(columns, &col2)
		columns = append(columns, &col3)

		row := shim.Row{Columns: columns}
		ok, err := stub.ReplaceRow("tableOne", row)
		if err != nil {
			return nil, fmt.Errorf("replaceRowTableOne operation failed. %s", err)
		}
		if !ok {
			return nil, errors.New("replaceRowTableOne operation failed. Row with given key does not exist")
		}

	case "deleteAndRecreateTableOne":

		err := stub.DeleteTable("tableOne")
		if err != nil {
			return nil, fmt.Errorf("deleteAndRecreateTableOne operation failed. Error deleting table. %s", err)
		}

		err = createTableOne(stub)
		if err != nil {
			return nil, fmt.Errorf("deleteAndRecreateTableOne operation failed. Error creating table. %s", err)
		}

		return nil, nil

	default:
		return nil, errors.New("Unsupported operation")
	}
	return nil, nil
}