Question

我在我的项目中使用JPA和hibernate。

我创建了一个查询，其中我在许多表上进行了连接操作。所以我创建了一个原生的。我得到的结果是在object []的列表中，但我希望将结果自动转换为java POJO类。您可以检查下面的查询语法和POJO java类。

JPA查询

@Query(value = "SELECT obsp.Identifier, obs.phenomenontimestart, nv.value " +
        "From Series s " +
        "INNER JOIN Featureofinterest fi on s.featureofinterestid = fi.featureofinterestid " +
        "INNER JOIN ObservableProperty obsp on s.observablepropertyid = obsp.ObservablePropertyId " +
        "INNER JOIN Observation obs on s.seriesid = obs.seriesid " +
        "INNER JOIN NumericValue nv on nv.observationid = obs.observationid " +
        "where fi.identifier = ?1 and obs.phenomenontimestart >= ?2 AND obs.phenomenontimestart <= ?3 " +
        "order by obs.phenomenontimestart",
        nativeQuery = true)
List<CurrentMeasure> findCurrentMeasure(String ident, Timestamp t1, Timestamp t2);

POJO课程

public class CurrentMeasure {

private String identifier;
private Timestamp dateTime;
private BigDecimal bigDecimal;

public CurrentMeasure() {
}

public CurrentMeasure(String identifier, Timestamp dateTime, BigDecimal bigDecimal) {
    this.identifier = identifier;
    this.dateTime = dateTime;
    this.bigDecimal = bigDecimal;
}

public String getIdentifier() {
    return identifier;
}

public void setIdentifier(String identifier) {
    this.identifier = identifier;
}

public Timestamp getDateTime() {
    return dateTime;
}

public void setDateTime(Timestamp dateTime) {
    this.dateTime = dateTime;
}

public BigDecimal getBigDecimal() {
    return bigDecimal;
}

public void setBigDecimal(BigDecimal bigDecimal) {
    this.bigDecimal = bigDecimal;
}

}

Answer 1

使用JPA，您可以直接在HQL查询中调用类~ (?: \G (?!\A) # contiguous to previous match, but not at the start of the string | { (?=[^}]* }) # start with { and check if a closing bracket follows | \[ (?=[^]]* ]) # the same for square bracket ) \K # start the match result here [A-G] [^]A-G}]* ~xS的构造函数。

示例： CurrentMeasure

新法语在Jboss documentation第11.5章解释。

另一种解决方案是使用HQL Transformers来实现相同的结果，而无需使用构造函数。

如何使用jpa和hibernate将本机查询映射到POJO类

1 个答案: