休眠HQL多對一連接

我在mysql中有2個表，blocked_histories和blocked_detail_histories。 block_detail_histories表與block_histories具有多對一的休眠關係。表創建腳本看起來像這樣休眠HQL多對一連接

blocked_histories

CREATE TABLE `blocked_histories` (
    `id` INT(11) NOT NULL AUTO_INCREMENT, 
    `type` VARCHAR(32) NOT NULL, 
    `no_ecash` varchar(13) NOT NULL, 
    `cif` VARCHAR(32) DEFAULT NULL, 
    `reason_id` INT(4) NOT NULL, 
    `desc` TEXT, 
    `status` VARCHAR(32) NOT NULL, 
    `created_date` DATETIME NOT NULL, 
    `created_by` VARCHAR(100) NOT NULL, 
    `total_balance` DECIMAL(15,6) NOT NULL, 
    `broker` int(11) NOT NULL, 
    `blocked_id` INT(11) NOT NULL UNIQUE, 
    `remark` text, 
    PRIMARY KEY (`id`), 
    CONSTRAINT `CUSTOMFIELD_ID_FK` FOREIGN KEY (`reason_id`) REFERENCES `custom_field_possible_values` (`id`) 
) ENGINE=INNODB AUTO_INCREMENT=312 DEFAULT CHARSET=latin1;

blocked_detail_histories

CREATE TABLE `blocked_detail_histories` (
    `id` INT(11) NOT NULL AUTO_INCREMENT, 
    `blocked_id` INT(11) NOT NULL, 
    `no_ecash` VARCHAR(13) DEFAULT NULL, 
    `prev_group` INT(11) NOT NULL, 
    `balance` DECIMAL(15,6) NOT NULL, 
    PRIMARY KEY (`id`), 
    KEY `BLOCKED_ID_FK` (`blocked_id`), 
    CONSTRAINT `BLOCKED_ID_HISTORIES_FK` FOREIGN KEY (`blocked_id`) REFERENCES `blocked_histories` (`blocked_id`) 
) ENGINE=INNODB AUTO_INCREMENT=312 DEFAULT CHARSET=latin1;

和Hibernate映射看起來像這樣

blocked_histories

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 

    <class dynamic-insert="true" dynamic-update="true" 
     name="nl.strohalm.cyclos.entities.groups.BlockedHistories" 
     table="blocked_histories"> 
     <id name="id" type="long"> 
      <column name="id" sql-type="bigint" /> 
      <generator class="native" /> 
     </id> 
     <property name="type" column="type" type="string" not-null="true" length="32" /> 
     <property name="noEcash" column="no_ecash" type="string" not-null="true" length="13" /> 
     <property name="cif" column="cif" type="string" length="32" /> 

     <!-- <property name="reasonId" column="reason_id" type="int" not-null="true" length="11" /> --> 
     <many-to-one name="reasonId" class="nl.strohalm.cyclos.entities.customization.fields.CustomFieldPossibleValue"> 
      <column name="reason_id" sql-type="integer"></column> 
     </many-to-one> 

     <property name="desc" column="desc" type="text" not-null="true" /> 
     <property name="status" column="status" type="string" length="32" /> 
     <property name="createdDate" column="created_date" type="calendar" not-null="true" /> 
     <property name="createdBy" column="created_by" type="string" not-null="true" length="100"/> 
     <property name="totalBalance" column="total_balance" type="big_decimal" not-null="true" precision="15" scale="6" /> 
     <property name="brokerId" column="broker" type="int" not-null="true" length="11" /> 
     <property name="remark" column="remark" type="text" /> 
     <property name="blockedId" column="blocked_id" type="int" not-null="true" length="11" /> 
    </class> 

</hibernate-mapping>

個

blocked_detail_histories

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 

<hibernate-mapping> 

    <class dynamic-insert="true" dynamic-update="true" 
     name="nl.strohalm.cyclos.entities.groups.BlockedDetailHistories" 
     table="blocked_detail_histories"> 
     <id name="id" type="long"> 
      <column name="id" sql-type="bigint" /> 
      <generator class="native" /> 
     </id> 
     <many-to-one name="blockedHistories" class="nl.strohalm.cyclos.entities.groups.BlockedHistories"> 
      <column name="blocked_id" sql-type="integer"></column> 
     </many-to-one> 
     <property name="noEcash" column="no_ecash" type="string" not-null="true" length="13" /> 
     <property name="prevGroup" column="prev_group" type="int" not-null="true" length="11" /> 
     <property name="balance" column="balance" type="big_decimal" not-null="true" precision="15" scale="6" /> 
    </class> 

</hibernate-mapping>

，你可以看到，blocked_detail歷史表中有許多對一個關係到blocked_histories表（「blockedHistories」欄）

我試圖運行一個簡單的MySQL查詢加盟看起來像這樣

select bh.created_date, bdh.no_ecash, bh.type, 
    bh.cif, bh.desc, bh.reason_id, 
    bh.status, bh.created_by, bh.remark 
from blocked_detail_histories bdh 
join blocked_histories bh 
where bdh.blocked_id=4;

上面的MySQL查詢兩個表工作正常，但是當我試圖上面MySQL查詢HQL查詢轉換，結果給我什麼..的HQL看起來像這樣（下稱「：ID 「這是 java的NamedParameters）

select bdh.blockedHistories.blockedId 
from BlockedDetailHistories bdh" 
join bdh.blockedHistories bh 
where bh.blockedId = :id

我想這一個，但給我什麼也

select bh.createdDate, bdh.noEcash, bh.type, 
bh.cif, bh.desc, bh.reasonId, 
bh.status, bh.createdBy, bh.remark 
from BlockedDetailHistories bdh 
join bdh.blockedHistories bh 
where bh.blockedId = :id

任何建議什麼，我在這裏失蹤？關係的定義可能？還是其他什麼？任何幫助將不勝感激:)

來源

2016-11-28 thekucays

SQL查詢對於連接似乎不正確。應使用「ON」子句來代替「其中」示例： 'SELECT Orders.OrderID，Customers.CustomerName，Orders.OrderDate FROM訂單 INNER JOIN顧客 ON Orders.CustomerID = Customers.CustomerID; ' 來源：http://www.w3schools.com/sql/sql_join.asp –

不是XML的專家冬眠映射，但你施加休眠實體類獲取類型，如果定義這樣，那麼您可以重試烏爾上述查詢如下（在遲緩場合中獲取類型）

select bdh.blockedHistories.blockedId 
from BlockedDetailHistories bdh 
left join fetch bdh.blockedHistories bh 
where bh.blockedId = :id

來源

2016-12-02 07:03:34

休眠HQL多對一連接

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