通过Java插入Orient DB的嵌入式列表

问题描述

这是我用来创建必要类的sql脚本：

CREATE CLASS ProductSummary;
CREATE PROPERTY ProductSummary.name STRING (NOTNULL,MANDATORY TRUE);
CREATE PROPERTY ProductSummary.modelNumber LONG (NOTNULL,MANDATORY TRUE);
ALTER CLASS ProductSummary STRICTMODE TRUE;
 
CREATE CLASS PricingSummary;
CREATE PROPERTY PricingSummary.price LONG (NOTNULL,MANDATORY TRUE);
CREATE PROPERTY PricingSummary.discount LONG (NOTNULL,MANDATORY TRUE);
ALTER CLASS PricingSummary STRICTMODE TRUE;
 
CREATE CLASS TotalSummary EXTENDS V;
CREATE PROPERTY TotalSummary.projectLink LINK Project (NOTNULL,MANDATORY TRUE);
CREATE PROPERTY TotalSummary.productSummaries EMbedDEDLIST ProductSummary;
CREATE PROPERTY TotalSummary.pricingSummaries EMbedDEDLIST PricingSummary;
ALTER CLASS TotalSummary STRICTMODE TRUE;
CREATE INDEX TotalSummary_projectLink_idx ON TotalSummary (projectLink) UNIQUE;

我正在尝试将一些值插入我的TotalSummary类中，在这里我还需要将一些值插入EmbeddedList中，以用于pricesSummaries和productSummaries。

public TotalSummary create(final TotalSummary totalSummary) {
        final Long projectId = 1;
        final StatementBuilder builder = new StatementBuilder();
        final StringBuilder query = new StringBuilder();
        
        final List<Map<?,?>> productSummaries = totalSummary.getProductSummaries().stream()
                .map(ProductSummary::toMap)
                .collect(Collectors.toList());
        
        final List<Map<?,?>> pricingSummaries = totalSummary.getPricingSummaries().stream()
                .map(PricingSummary::toMap)
                .collect(Collectors.toList());
        
        
        builder.addAttribute("projectLink = (SELECT FROM project WHERE id = ?)",projectId);
        if ( ! productSummaries.isEmpty()) {
            builder.addAttribute("productSummaries = ?",productSummaries);
        }
        if ( ! pricingSummaries.isEmpty()) {
            builder.addAttribute("pricingSummaries = ?",pricingSummaries);
        }
        
        try {
            insert(TotalSummary.class.getSimpleName(),builder.attributes(),statement -> {
                builder.init(statement);
                return statement;
            });
        } catch (final UncategorizedsqlException e) {
            throw new ConstraintViolationException(totalSummary,ExceptionUtils.getRootCauseMessage(e),e);
        }

        return assertNotNull(findById(projectId));
    }

This is the utility method that I am using to build the insert query : 
protected String insert(final String vertex,final String fieldValuePairs,final PreparedStatementinitializer initializer) {
    final String sql = "INSERT INTO " + vertex + " SET " + fieldValuePairs + " RETURN @rid";
    return executeStatement(sql,initializer);
}

The toMap methods to convert the List<ProductSummary> to List<Map<?,?>>

**ProductSummary**  
public Map<String,Object> toMap() {
    final Map<String,Object> ret = new HashMap<>();
    ret.put("name",name);
    ret.put("model number",Long.valueOf(modelNumber));
    return ret;
}

The toMap methods to convert the List<PricingSummary> to List<Map<?,?>>
**PricingSummary**
public Map<String,Object> ret = new HashMap<>();
    ret.put("price",Long.valueOf(price));
    ret.put("discount",Long.valueOf(discount));
    return ret;
}

我在执行代码时遇到以下异常

Constraint violation for: TotalSummary@58f79eeb[recordId=<null>,customProperties=[]]. Reason: ovalidationException: The field 'TotalSummary.productSummaries' has been declared as EMbedDEDLIST but an incompatible type is used. 

我已经尝试过的东西：

1. 在添加到json格式之前，我尝试过隐式列出 像这样的新构建者Gson（）。toJson（pricingSummaries）;
2. 将定价摘要和产品摘要转换为Array（）。

解决方法

您将摘要定义为EMBEDDEDLIST ProductSummary，但您正在将地图列表作为值传递。

尝试创建真实的ProductSummary对象，例如。

OElement ret = db.newEmbeddedElement("ProductSummary");
ret.setProperty("price",Long.valueOf(price));
ret.setProperty("discount",Long.valueOf(discount));