从 DATE 到 java.time.LocalDate 的 JPA 转换器不适用于 Glassfish 4.1

Question

我做了一个转换器，这样当我从数据库中读取 DATE 字段时，它应该能够将它们强制转换为 java.time.LocalDate 对象。但是，当我尝试这样做时，它给了我这个错误：

 The object [3/16/17 12:00 AM], of class [class java.sql.Timestamp], from mapping [org.eclipse.persistence.mappings.DirectToFieldMapping[startDate-->TEST_TABLE.START_DATE]] with descriptor [RelationalDescriptor(com.test.TestEntity --> [DatabaseTable(TEST_TABLE)])], could not be converted to [class [B].

TEST_TABLE 是我的 table，它有一个类型为 DATE 的列 START_DATE。这是转换器：

import javax.persistence.AttributeConverter;
import javax.persistence.Converter;
import java.sql.Date;
import java.time.LocalDate;

@Converter(autoApply = true)
public class OracleLocalDateAttributeConverter implements AttributeConverter<LocalDate, Date> {
    @Override
    public Date convertToDatabaseColumn(LocalDate attribute) {
        return (attribute != null ? Date.valueOf(attribute) : null);
    }

    @Override
    public LocalDate convertToEntityAttribute(Date dbData) {
        return (dbData != null ? dbData.toLocalDate() : null);
    }
}

为什么它认为我的专栏是时间戳？ oracle 中的所有日期都被强制为 java.sql.Timestamp 吗？

Answer 1

class java.sql.Timestamp is the one the persistence provider uses to parse a date from the DB regardless the value is just a date. It makes sense because it allows the persistence provider to get the time part of a DATETIME or a TIMESTAMP. Note that this class extends from java.util.Date not java.sql.Date.

因此，将您的转换器更新为这样的东西应该可以解决问题：

import java.time.LocalDate;
import java.time.ZoneId;
import java.util.Date;
import javax.persistence.AttributeConverter;
import javax.persistence.Converter;

@Converter(autoApply = true)
public class OracleLocalDateAttributeConverter implements AttributeConverter<LocalDate, Date> {

    @Override
    public Date convertToDatabaseColumn(LocalDate attribute) {
        return attribute == null ? null : Date.from(attribute.atStartOfDay(ZoneId.systemDefault()).toInstant());
    }

    @Override
    public LocalDate convertToEntityAttribute(Date dbData) {
        return dbData == null ? null : dbData.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
    }
}

从 DATE 到 java.time.LocalDate 的 JPA 转换器不适用于 Glassfish 4.1

JPA converter from DATE to java.time.LocalDate not applying in Glassfish 4.1

java

oracle

jpa

glassfish

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