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查看 EntityManager 的界面，我看到有一个签名可以使用结果类创建本机查询。

/**
 * Create an instance of <code>Query</code> for executing
 * a native SQL query.
 * @param sqlString a native SQL query string
 * @param resultClass the class of the resulting instance(s)
 * @return the new query instance
 */
public Query createNativeQuery(String sqlString, Class resultClass);

经过大量研究，我仍然不清楚如何使用 resultClass 参数。通常，我的本地查询结果集与我的实体不同；它们通常是来自多个函数/连接/等的复合/派生结果。那么有没有办法让我像这样上课

public class MyCustomResultRow {
private String propa;
private String propb;
private UUID id;
...
}

然后像这样运行代码？

List<MyCustomResultRow> results = createNativeQuery("some query", MyCustomResultRow.class).getResultList();

我必须注释 MyCustomResultRow 吗？我是否必须以某种方式将其添加到我的 persistence.xml 文件中？有任何想法吗？

如果我只是运行 createNativeQuery(strSql, CodeSupportAndCapacityResult.class); CodeSupportAndCapacityResult 看起来像这样：

package com.wastecenter.portal.backend.admin;

导入java.time.Instant；

公共类 CodeSupportAndCapacityResult {

private String waste_disposal_facility_id;
private String waste_code;
private Long latest_support_entry_id;
private Instant latest_support_entry_created;
private String latest_support_entry_comment;
private Long latest_capacity_entry_id;
private String latest_capacity_entry_type;
private String latest_capacity_entry_comment;
private Instant latest_capacity_entry_created;


public String getWaste_disposal_facility_id() {
    return waste_disposal_facility_id;
}

public void setWaste_disposal_facility_id(String waste_disposal_facility_id) {
    this.waste_disposal_facility_id = waste_disposal_facility_id;
}

public String getWaste_code() {
    return waste_code;
}

public void setWaste_code(String waste_code) {
    this.waste_code = waste_code;
}

public Long getLatest_support_entry_id() {
    return latest_support_entry_id;
}

public void setLatest_support_entry_id(Long latest_support_entry_id) {
    this.latest_support_entry_id = latest_support_entry_id;
}

public Instant getLatest_support_entry_created() {
    return latest_support_entry_created;
}

public void setLatest_support_entry_created(Instant latest_support_entry_created) {
    this.latest_support_entry_created = latest_support_entry_created;
}

public String getLatest_support_entry_comment() {
    return latest_support_entry_comment;
}

public void setLatest_support_entry_comment(String latest_support_entry_comment) {
    this.latest_support_entry_comment = latest_support_entry_comment;
}

public Long getLatest_capacity_entry_id() {
    return latest_capacity_entry_id;
}

public void setLatest_capacity_entry_id(Long latest_capacity_entry_id) {
    this.latest_capacity_entry_id = latest_capacity_entry_id;
}

public String getLatest_capacity_entry_type() {
    return latest_capacity_entry_type;
}

public void setLatest_capacity_entry_type(String latest_capacity_entry_type) {
    this.latest_capacity_entry_type = latest_capacity_entry_type;
}

public String getLatest_capacity_entry_comment() {
    return latest_capacity_entry_comment;
}

public void setLatest_capacity_entry_comment(String latest_capacity_entry_comment) {
    this.latest_capacity_entry_comment = latest_capacity_entry_comment;
}

public Instant getLatest_capacity_entry_created() {
    return latest_capacity_entry_created;
}

public void setLatest_capacity_entry_created(Instant latest_capacity_entry_created) {
    this.latest_capacity_entry_created = latest_capacity_entry_created;
}

}

然后我明白了。

javax.persistence.PersistenceException: org.hibernate.MappingException: Unknown entity: com.wastecenter.portal.backend.admin.CodeSupportAndCapacityResult
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0 回答 0