我想创建一个用于连接三个表的条件构建器查询。 我已经研究了互联网，但是三个表连接的所有示例都具有与我想要的关系不同的关系。 因此，我有三个具有以下结构的表：

并且实体如下：

@Entity

@Table(name = "DEPARTMENT")

@Data

public class Department {

@Id

@GeneratedValue(generator = "uuid")

@Column(unique = true, length = 36)

private String id;

@NotNull

@Column(name = "NAME")

private String name;

@ManyToOne(fetch = FetchType.EAGER)

@JoinColumn(name = "HEAD_ID")

private Head head;

}

@Entity

@Table(name = "EMPLOYEES")

@Data

public class Employees {

@Id

@GeneratedValue(generator = "uuid")

@Column(unique = true, length = 36)

private String id;

@NotNull

@Column(name = "EMP_NAME")

private String empName;

@Column(name = "RESUME")//clob

private String resume;

@ManyToOne(fetch = FetchType.EAGER)

@JoinColumn(name = "DEPT_ID")

private Department department;

}

@Entity

@Table(name = "CONTACT")

@Data

public class Contact {

@Id

@GeneratedValue(generator = "uuid")

@Column(unique = true, length = 36)

private String id;

@NotNull

@Column(name = "NUMBER")

private Long number;

@NotNull

@Column(name = "CITY")

private String city;

@Column(name = "ADDRESS")//clob

private String address;

@OneToOne(fetch = FetchType.EAGER)

@JoinColumn(name = "DEPT_ID")

private Department department;

}

现在我想

获取部门联系人，该部门的联系人当前在ID为1234的标题下发布了名为Mike的员工。

我已经尝试了以下查询

CriteriaBuilder builder = getCriteriaBuilder();

CriteriaQuery criteria = builder.createQuery(Contact.class);

Root contactRoot = criteria.from(Contact.class);

Root employeesRoot = criteria.from(Employees.class);

//Join employeesDepartmentJoin = contactRoot.join("department", JoinType.INNER); With this statement#: Throws java.lang.IllegalArgumentException: Unable to locate Attribute with the the given name [empName] on this ManagedType [org.sample.something.Contact] exception.

Join employeesDepartmentJoin = employeesRoot.join("department", JoinType.INNER);

Join contactDepartmentJoin = contactRoot.join("department", JoinType.INNER);

List predicates = new ArrayList();

predicates.add(builder.equal(employeesDepartmentJoin.get("head").get("id"), headID));

predicates.add(builder.equal(employeesDepartmentJoin.getParent().get("empName"), empName));

criteria.where(builder.and((Predicate[]) predicates.toArray(new Predicate[0])));

criteria.select(contactRoot).distinct(true);

return getEm().createQuery(criteria).getResultList(); //Without statement#: Throws org.hibernate.exception.SQLGrammarException: could not extract ResultSet exception.

语法异常期间生成的休眠查询为：

select distinct contact0_.id as id1_47_, contact0_.number as number_id9_47_, contact0_.city as city10_47_, contact0_.address as address10_47_, contact0_.department_id as department11_47_

from sample.contact contact0_

inner join sample.department department2_ on contact0_.department_id=department2_.id

cross join sample.employees employees1_

inner join sample.department department3_ on employees1_.department_id=department3_.id

where department3_.head_id=? and employees1_.employee_name=?

任何可以轻描淡写的人都会有所帮助。 谢谢。

编辑：具有新字段和SQLGrammarException的StackTrace的更新的代码(仅在评估时抛出“无法定位属性..”的第一个异常，否则它将抛出相同的SQLGrammarException)

Caused by: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet

at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)

at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1514)

at org.hibernate.query.Query.getResultList(Query.java:132)

at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:74)

at org.sample.something.dao.ContactDAO.getContactByHeadAndEmployeeName(ContactDAO.java:102)

... 61 common frames omitted

Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet

at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63)

at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)

at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)

at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)

at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:69)

at org.hibernate.loader.Loader.getResultSet(Loader.java:2167)

at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1930)

at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1892)

at org.hibernate.loader.Loader.doQuery(Loader.java:937)

at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:340)

at org.hibernate.loader.Loader.doList(Loader.java:2689)

at org.hibernate.loader.Loader.doList(Loader.java:2672)

at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2506)

at org.hibernate.loader.Loader.list(Loader.java:2501)

at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:504)

at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:395)

at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:220)

at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1508)

at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1537)

at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1505)

... 64 common frames omitted

Caused by: java.sql.SQLSyntaxErrorException: ORA-00932: inconsistent datatypes: expected - got CLOB

at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450)

at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:399)

at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1017)

at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:655)

at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249)

at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:566)

at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:215)

at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:58)

at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:776)

at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:897)

at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1034)

at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3820)

at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3867)

at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1502)

at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52)

at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java)