[英]Saving json array into postgresql data using spring boot java API
I have a Json Array in my request object and POJO object, I need to save that jsonarray field into jsonb column in my postgresql table.我的请求 object 和 POJO object 中有一个 Json 数组,我需要将该 jsonarray 字段保存到我的 postgresql 表中的 jsonb 列中。
"productId": "1",
"product":[
{
"name": "PENCIL",
"quantity":"5"
}]
I am getting an exception when trying to hit it via postman, getting exception:尝试通过 postman 访问它时出现异常,出现异常:
Type definition error: [simple type, class io.r2dbc.postgresql.codec.Json];类型定义错误:[简单类型,class io.r2dbc.postgresql.codec.Json]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of
io.r2dbc.postgresql.codec.Json
(no Creators, like default constructor, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information\n at [Source: (io.netty.buffer.ByteBufInputStream);嵌套异常是 com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of
io.r2dbc.postgresql.codec.Json
(no Creators, like default constructor, exist): 抽象类型或者需要映射到具体类型具有自定义反序列化器,或在 [Source: (io.netty.buffer.ByteBufInputStream) 处包含其他类型信息\n; l升
Create a converter for reading and a converter for writing, thus it will convert between your type and Postgres io.r2dbc.postgresql.codec.Json
.创建一个用于读取的转换器和一个用于写入的转换器,因此它将在您的类型和 Postgres
io.r2dbc.postgresql.codec.Json
之间进行转换。
@ReadingConverter
@RequiredArgsConstructor
public class JsonToYourTypeConverter implements Converter<Json, YourType > {
private final ObjectMapper objectMapper;
@Override
public YourType convert(Json json) {
}
}
@WritingConverter
@RequiredArgsConstructor
public class YourTypeToJsonConverter implements Converter<YourType, Json > {
private final ObjectMapper objectMapper;
@Override
public Json convert(YourType data) {
}
}
Then register your converters via R2dbcCustomConversions
bean.然后通过
R2dbcCustomConversions
bean 注册您的转换器。
@Bean
public R2dbcCustomConversions r2dbcCustomConversions(ConnectionFactory connectionFactory, ObjectMapper objectMapper) {
var dialect = DialectResolver.getDialect(connectionFactory);
var converters = List.of(
new JsonToYourTypeConverter(objectMapper),
new YourTypeToJsonConverter(objectMapper),
);
return R2dbcCustomConversions.of(dialect, converters);
}
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