Amazon web services 具有其他对象列表的对象的DynamoDB映射器注释
我正在尝试为下面的案例创建dynamoDBMapper注释 我有EmployeeLevelTrail,它是员工级别记录的一个类Amazon web services 具有其他对象列表的对象的DynamoDB映射器注释,amazon-web-services,annotations,amazon-dynamodb,aws-sdk,dynamodb-queries,Amazon Web Services,Annotations,Amazon Dynamodb,Aws Sdk,Dynamodb Queries,我正在尝试为下面的案例创建dynamoDBMapper注释 我有EmployeeLevelTrail,它是员工级别记录的一个类 @DynamoDBTable(tableName = TABLE_NAME) public class EmployeeData { public final static String TABLE_NAME = “EmployeeDataRecord”; @DynamoDBAttribute(attributeName = “employeeID”)
@DynamoDBTable(tableName = TABLE_NAME)
public class EmployeeData {
public final static String TABLE_NAME = “EmployeeDataRecord”;
@DynamoDBAttribute(attributeName = “employeeID”)
public String EmployeeID;
@DynamoDBAttribute(attributeName = “EmployeeLevelDataRecords”)
@DynamoDBTyped(DynamoDBMapperFieldModel.DynamoDBAttributeType.M)
public EmployeeLevelTrail employeeLevelTrail
}
public class EmployeeLevelTrail {
public final static String DDB_ATTR_EMPLOYEE_LEVEL_TRAIL = “employeeLevelTrail”;
@DynamoDBAttribute(attributeName = DDB_ATTR_EMPLOYEE_LEVEL_TRAIL)
private List<EmployeeLevelRecord> thisEmployeeLevelRecords;
public void appendEmployeeLevelRecord(@NonNull EmployeeLevelRecord employeeLevelRecord) {
thisEmployeeLevelRecords.add(employeeLevelRecord);
}
}
public class EmployeeLevelRecord {
private String Level;
private String Manager;
private Instant timeOfEvent;
}
@DynamoDBTable(表名=表名)
公共类雇员数据{
公共最终静态字符串表\u NAME=“EmployeeDataRecord”;
@DynamoDBAttribute(attributeName=“employeeID”)
公共字符串EmployeeID;
@DynamoDBAttribute(attributeName=“EmployeeLevelDataRecords”)
@DynamoDBTyped(DynamoDBMapperFieldModel.DynamoDBAttributeType.M)
公共雇员水平跟踪雇员水平跟踪
}
公共类EmployeeLevelTrail{
公共最终静态字符串DDB_ATTR_EMPLOYEE_LEVEL_TRAIL=“employeeLevelTrail”;
@DynamoDBAttribute(attributeName=DDB\u ATTR\u EMPLOYEE\u LEVEL\u TRAIL)
私人列表此员工级别记录;
public void appendEmployeeLevelRecord(@NonNull EmployeeLevelRecord EmployeeLevelRecord){
此EmployeeLevelRecords.add(employeeLevelRecord);
}
}
公共类EmployeeLevelRecord{
私有字符串级别;
私有字符串管理器;
私人即时事件时间;
}
这是我的注释,但它不正确,因为我无法保存我的DynamoDB数据您需要使用
DynamoDBTypeConverted
注释。您还需要创建一个转换器类,该类定义如何从Java对象获取DynamoDB原语(可能是字符串)
您还可以从以下答案中查看一个示例:
要将另一个类标记为DynamoDBMapper数据模型的一部分,可以使用注释,这会告诉DynamoDBMapper类可以序列化为DynamoDB文档 对于您没有编写的类(即,从Java库或外部库),或者如果您需要更多地控制如何序列化您自己的类,您可以使用
@DynamoDBTypeConverted
,它允许您通过提供自己的实现将任何Java对象转换为任何受支持的DynamoDB类型
使用您的示例代码,我添加了相应的@DynamoDBDocument
和@DynamoDBTypeConverted
注释,以及DynamoDBTypeConverter
的示例实现,该示例实现将即时转换为ISO-8601字符串。如果employeeId
是表的哈希键,请确保还将@DynamoDBHashKey
注释添加到employeeId
@DynamoDBTable(tableName = TABLE_NAME)
public class EmployeeData {
public final static String TABLE_NAME = “EmployeeDataRecord”;
@DynamoDBAttribute(attributeName = “employeeID”)
public String EmployeeID;
@DynamoDBAttribute(attributeName = “EmployeeLevelDataRecords”)
public EmployeeLevelTrail employeeLevelTrail
}
@DynamoDBDocument
public class EmployeeLevelTrail {
public final static String DDB_ATTR_EMPLOYEE_LEVEL_TRAIL = “employeeLevelTrail”;
@DynamoDBAttribute(attributeName = DDB_ATTR_EMPLOYEE_LEVEL_TRAIL)
private List<EmployeeLevelRecord> thisEmployeeLevelRecords;
public void appendEmployeeLevelRecord(@NonNull EmployeeLevelRecord employeeLevelRecord) {
thisEmployeeLevelRecords.add(employeeLevelRecord);
}
}
@DynamoDBDocument
public class EmployeeLevelRecord {
private String Level;
private String Manager;
@DynamoDBTypeConverted(converter = InstantToStringTypeConverter.class)
private Instant timeOfEvent;
}
public class InstantToStringTypeConverter implements DynamoDBTypeConverter<String, Instant> {
@Override
public String convert(final Instant instant) {
return instant.toString();
}
@Override
public Instant unconvert(final String string) {
return Instant.parse(string);
}
}
@DynamoDBTable(表名=表名)
公共类雇员数据{
公共最终静态字符串表\u NAME=“EmployeeDataRecord”;
@DynamoDBAttribute(attributeName=“employeeID”)
公共字符串EmployeeID;
@DynamoDBAttribute(attributeName=“EmployeeLevelDataRecords”)
公共雇员水平跟踪雇员水平跟踪
}
@动态文档
公共类EmployeeLevelTrail{
公共最终静态字符串DDB_ATTR_EMPLOYEE_LEVEL_TRAIL=“employeeLevelTrail”;
@DynamoDBAttribute(attributeName=DDB\u ATTR\u EMPLOYEE\u LEVEL\u TRAIL)
私人列表此员工级别记录;
public void appendEmployeeLevelRecord(@NonNull EmployeeLevelRecord EmployeeLevelRecord){
此EmployeeLevelRecords.add(employeeLevelRecord);
}
}
@动态文档
公共类EmployeeLevelRecord{
私有字符串级别;
私有字符串管理器;
@DynamoDBTypeConverted(converter=InstantToStringTypeConverter.class)
私人即时事件时间;
}
公共类InstantToStringTypeConverter实现DynamoDBTypeConverter{
@凌驾
公共字符串转换(最终即时){
return instant.toString();
}
@凌驾
公共即时取消插入(最终字符串){
返回Instant.parse(字符串);
}
}
我使用下面的代码找到了解决方案。仅使用@DynamoDBTypeConvertedJSON,我就能够在表中创建一个条目,但无法更新它,因为我正在运行mapping Dynamo DB mapping exception
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@DynamoDBTable(tableName = TABLE_NAME)
public class EmployeeData {
public final static String TABLE_NAME = "EmployeeData";
public final static String DDB_ATTR_ID = "Id";
public final static String DDB_ATTR_EMPLOYEE_LEVEL_RECORD_TRAIL = "EmployeeLevelRecordTrail";
@DynamoDBHashKey(attributeName = DDB_ATTR_ID)
@DynamoDBAttribute(attributeName = DDB_ATTR_ID)
private String id;
@DynamoDBAttribute(attributeName = DDB_ATTR_EMPLOYEE_LEVEL_RECORD_TRAIL)
@DynamoDBTypeConverted(converter = EmployeeLevelRecordTrailConverter.class)
private EmployeeLevelRecordTrail employeeLevelRecordTrail;
@DynamoDBAttribute(attributeName = DDB_ATTR_CREATED_TIME)
@DynamoDBTypeConverted(converter = InstantConverter.class)
private Instant joiningTime;
}
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class EmployeeLevelRecordTrail {
private List<EmployeeLevelRecord> thisEmployeeLevelRecords;
public void appendEmployeeLevelRecord(@NonNull EmployeeLevelRecord employeeLevelRecord) {
thisEmployeeLevelRecords.add(employeeLevelRecord);
}
}
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@DynamoDBDocument
public class EmployeeLevelRecord {
private String Level;
private String Manager;
@DynamoDBTypeConverted(converter = InstantConverter.class)
private Instant timeOfEvent;
}
public class EmployeeLevelRecordTrailConverter implements
DynamoDBTypeConverter<List<EmployeeLevelRecord>, EmployeeLevelRecordTrail> {
@Override
public List<EmployeeLevelRecord> convert(EmployeeLevelRecordTrail employeeLevelRecordTrail) {
return employeeLevelRecordTrail.getEmployeeLevelRecord();
}
@Override
public EmployeeLevelRecordTrail unconvert(List<EmployeeLevelRecord> thisEmployeeLevelRecords) {
return new EmployeeLevelRecordTrail(thisEmployeeLevelRecords);
}
}
public class InstantConverter implements DynamoDBTypeConverter<String, Instant> {
private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ISO_INSTANT;
@Override
public String convert(Instant instant) {
return instant == null ? null : DATE_TIME_FORMATTER.format(instant);
}
@Override
public Instant unconvert(String str) {
return str == null ? null : Instant.from(DATE_TIME_FORMATTER.parse(str));
}
}
@数据
@建筑商
@AllArgsConstructor
@诺尔格构装师
@DYNAMODB表格(表格名称=表格名称)
公共类雇员数据{
公共最终静态字符串表\u NAME=“EmployeeData”;
公共最终静态字符串DDB_ATTR_ID=“ID”;
公共最终静态字符串DDB_ATTR_EMPLOYEE_LEVEL_RECORD_TRAIL=“EmployeeLevelRecordTrail”;
@DynamoDBHashKey(attributeName=DDB\u ATTR\u ID)
@DynamoDBAttribute(attributeName=DDB\u ATTR\u ID)
私有字符串id;
@DynamoDBAttribute(attributeName=DDB\u ATTR\u EMPLOYEE\u LEVEL\u RECORD\u TRAIL)
@DYNAMODBtypeConverter(converter=EmployeeLevelRecordTrailConverter.class)
私人雇员级别记录跟踪雇员级别记录跟踪;
@DynamoDBAttribute(attributeName=DDB\u ATTR\u CREATED\u TIME)
@DynamoDBTypeConverted(转换器=InstantConverter.class)
私人即时连接时间;
}
@资料
@建筑商
@AllArgsConstructor
@诺尔格构装师
公共类EmployeeLevelRecordTrail{
私人列表此员工级别记录;
public void appendEmployeeLevelRecord(@NonNull EmployeeLevelRecord EmployeeLevelRecord){
此EmployeeLevelRecords.add(employeeLevelRecord);
}
}
@资料
@建筑商
@AllArgsConstructor
@诺尔格构装师
@动态文档
公共类EmployeeLevelRecord{
私有字符串级别;
私有字符串管理器;
@DynamoDBTypeConverted(转换器=InstantConverter.class)
私人即时事件时间;
}
公共类EmployeeLevelRecordTrailConverter实现
发电机式变频器{
@凌驾
公共列表转换(EmployeeLevelRecordTrail EmployeeLevelRecordTrail){
返回employeeLevelRecordTrail.getEmployeeLevelRecord();
}
@凌驾
公共EmployeeLevelRecordTrail Unsert(列出此EmployeeLevelRecords){
返回新的EmployeeLevelRecordTrail(此EmployeeLevelRecords);
}
}
公共类InstantConverter实现DynamoDBTypeConverter{
私有静态最终日期timeformatter DATE\u TIME\u FORMATTER=DateTimeFormatter.I