QueryException

Question

List students = session.createQuery("select s.name from Student s where s.name like '%1%'").list();
可以正常运行
List students = session.createQuery("select s.name from Student s where s.classes.name like '%1%'").list();
报错  org.hibernate.QueryException: could not resolve property: classes of
------------------------------------------------------------------
public class Student {

public Student() {

}

public Student(int id, String name) {
this.id = id;[code=XML]
this.name = name;
}

private int id;
private String name;
private Date createDate;
private Classes classes;

public Classes getClasses() {
return classes;
}
public void setClasses(Classes classes) {
this.classes = classes;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id; 
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}}[/code]<?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 name="com.byz.hibernate.Student" table="t_student">
<id name="id">
<generator class="native"/>
</id>
<property name="name" />
<property name="createDate"/>
<many-to-one name="Classes" column="cid"/>
</class>
</hibernate-mapping>------------------------------------------------------------------package com.byz.hibernate;import java.util.Set;public class Classes {

private int id;
private String name;
private Set<Student> students;

public Set<Student> getStudents() {
return students;
}
public void setStudents(Set<Student> students) {
this.students = students;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}}
<?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 package="com.byz.hibernate" >
<class name="Classes" table="t_classes">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="students" inverse="true" cascade="all">
<key column="cid"/>
<one-to-many class="Student"/>
</set>
</class>
</hibernate-mapping>--------------------------------------------------------

Answer 1

List students = session.createQuery("select s.name from Student s where s.name like '%1%'").list(); 
可以正常运行 
List students = session.createQuery("select s.name from Student s where s.classes.name like '%1%'").list(); 
报错  org.hibernate.QueryException: could not resolve property: classes of 各位请帮帮忙，谢谢！！ public class Student {
    
public Student() {
        
}
    
public Student(int id, String name) {
this.id = id;this.name = name; 
} private int id; 
private String name; 
private Date createDate; 
private Classes classes; public Classes getClasses() { 
return classes; 
} 
public void setClasses(Classes classes) { 
this.classes = classes; 
} 
public int getId() { 
return id; 
} 
public void setId(int id) { 
this.id = id; 
} 
public String getName() { 
return name; 
} 
public void setName(String name) { 
this.name = name; 
} public Date getCreateDate() { 
return createDate; 
} 
public void setCreateDate(Date createDate) { 
this.createDate = createDate; 
} }
<?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 name="com.byz.hibernate.Student" table="t_student">
<id name="id">
<generator class="native"/>
</id>
<property name="name" />
<property name="createDate"/>
<many-to-one name="Classes" column="cid"/>
</class>    
</hibernate-mapping>package com.byz.hibernate;import java.util.Set;public class Classes {
    
    private int id;
    private String name;
    private Set<Student> students;
    
    public Set<Student> getStudents() {
        return students;
    }
    public void setStudents(Set<Student> students) {
        this.students = students;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }}
<?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 package="com.byz.hibernate" >
<class name="Classes" table="t_classes">
<id name="id">
<generator class="native"/>
</id>
<property name="name"/>
<set name="students" inverse="true" cascade="all">
<key column="cid"/>
<one-to-many class="Student"/>
</set>
</class>    
</hibernate-mapping>

Answer 2

报错信息说属性有问题，仔细检查s.classes.name
应该就是classes这里的错误。

Answer 3

我知道是classes的错误，但是找了很久也找不到原因

Answer 4

<one-to-many class="Student"/>把包名写上试试。